Description:
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed.
 
TECHNICAL FIELD
[0001] Embodiments of the present disclosure generally relate to hub motor structures and more particularly relate to a hub motor for engagement with a testing equipment.
BACKGROUND
[0002] Generally, testing and machining systems are widely used in an automotive and electromechanical industries to ensure the reliability, balance, and operational performance of components such as tires, brake drums, electric motors, and hub motors. The testing and machining systems include mechanical fixtures, rotating assemblies, chucks, and load-applying mechanisms to simulate operational conditions and evaluate structural and functional characteristics. Accurate clamping, alignment, and controlled loading are critical to obtain reliable measurements and ensuring that the tested components perform within desired specifications.
[0003] Conventionally, machines used for testing mechanical components may include structures such as bottom and top chucks mounted on frames or movable beams. The movable beam may be driven by mechanisms such as ball screws to move upward or downward. In some systems, beam fixing members including disks with elongated holes and air-cylinder-driven pins are used to lock the movable beam and maintain the position of the chucks during testing. Although such configurations provide mechanical stability, however, may involve complex locking structures and limited adaptability, thereby affecting operational efficiency and ease of adjustment during testing procedures. Similarly, existing machining and performance evaluation methods for components such as brake drums, electric motor rotors, and hub motors utilize various chuck assemblies, insert-molded rotor structures, and simulated road-surface testing arrangements. For example, brake drums are commonly machined on cutting or milling machines while held in chuck assemblies to machine inner and outer radial surfaces in order to achieve radial balance. Hub motor testing devices may also incorporate stepping motors, guide rods, pressure sensors, and simulated rotating wheels to measure torque and electrical performance under varying loads and road conditions. However, these conventional arrangements may involve multiple mechanical components and operational steps, which can limit efficiency, integration, and accuracy in comprehensive component testing and machining processes.
[0004] Further, in another conventional system, including workpiece clamping devices and rotor-based clamping structures, holding or clamping force is applied at the outer circumferential region of the rotor or drum structure. Such arrangements rely on gripping the outer rim or peripheral surfaces of the rotating component. Further, the clamping or holding mechanisms in the conventional systems are to be implemented at the outer circumferential region of the rotor, drum, or workpiece through conventional clamping structures. However, when a hub motor is clamped at a larger circumferential radius away from the axial shaft, the effective lever arm between the point of clamping and the axis of rotation becomes significantly larger. As a result, during rotation of the hub motor, higher torque is required to maintain rotational stability. Furthermore, the increased radial distance tends to amplify mechanical disturbances, leading to undesirable effects such as vibration, slip between the clamping surfaces, transmission of torque fluctuations, and loss of mechanical stability. These effects may negatively influence testing accuracy and increase mechanical stress on both the motor and the testing apparatus.
[0005] Consequently, there is a need in the art for an improved hub motor for engagement with a testing equipment for improving mechanical stability and testing accuracy , to address at least the aforementioned issues in the prior arts.
SUMMARY
[0006] This summary is provided to introduce a selection of concepts, in a simple manner, which is further described in the detailed description of the disclosure. This summary is neither intended to identify key or essential inventive concepts of the subject matter nor to determine the scope of the disclosure.
[0007] An aspect of the present disclosure provides a hub motor for engagement with a testing equipment. The hub motor includes a hub motor assembly which includes a shaft aligned along a rotational axis. Further, the hub motor assembly includes a stator assembly disposed around the shaft, and a rotor assembly radially outward of the stator. Further, the hub motor assembly includes a brake drum structure associated with an axial end of the rotor assembly. Further, the hub motor assembly includes a Non-Connection End (NCE) cover associated with the brake drum structure. Further, the hub motor includes a plurality of circumferentially spaced engagement apertures disposed in the NCE cover around a rotational axis at a radial distance from the central shaft. Further, the plurality of circumferentially spaced engagement apertures is configured to receive a chuck engagement assembly positioned in a testing equipment. The chuck engagement assembly includes a chuck body and a plurality of engagement projections configured for insertion into the plurality of circumferentially spaced engagement apertures for rotational fixation of the hub motor assembly relative to the testing equipment.
[0008] To further clarify the advantages and features of the present disclosure, a more particular description of the disclosure will follow by reference to specific embodiments thereof, which are illustrated in the appended figures. It is to be appreciated that these figures depict only typical embodiments of the disclosure and are therefore not to be considered limiting in scope. The disclosure will be described and explained with additional specificity and detail with the appended figures.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
[0009] The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate exemplary embodiments and, together with the description, serve to explain the disclosed principles. In the figures, the left-most digit(s) of a reference number identify the figure in which the reference number first appears. The same numbers are used throughout the figures to reference like features and components. Some embodiments of system and/or methods in accordance with embodiments of the present subject matter are now described, by way of example only, and with reference to the accompanying figures, in which:
[0010] FIG. 1A illustrates exemplary schematic diagram representations of an isometric view of a hub motor and a sectional view of a plurality of circumferentially spaced engagement apertures in a hub motor assembly, in accordance with an embodiment of the present disclosure;
[0011] FIG. 1B illustrates exemplary schematic diagram representations of a front view of a hub motor and a plurality of circumferentially spaced engagement apertures, in accordance with an embodiment of the present disclosure;
[0012] FIG. 2 illustrates exemplary pictorial diagram representations of cross-sectional views depicting a plurality of stages of assembling a hub motor to a testing equipment via a chuck engagement assembly, in accordance with an embodiment of the present disclosure;
[0013] FIG. 3 illustrates an exemplary pictorial diagram representation of a side view of aligning the hub motor with a chuck engagement assembly of a testing equipment, in accordance with an embodiment of the present disclosure; and
[0014] FIG. 4 illustrates an exemplary pictorial diagram representation of a front view of a hub motor with a hub motor assembly for engagement with a testing equipment, in accordance with an embodiment of the present disclosure.
[0015] Further, those skilled in the art will appreciate that elements in the figures are illustrated for simplicity and may not have necessarily been drawn to scale. Furthermore, in terms of the construction of the device, one or more components of the device may have been represented in the figures by conventional symbols, and the figures may show only those specific details that are pertinent to understanding the embodiments of the present disclosure so as not to obscure the figures with details that will be readily apparent to those skilled in the art having the benefit of the description herein.
DETAILED DESCRIPTION
[0016] For the purpose of promoting an understanding of the principles of the disclosure, reference will now be made to the embodiment illustrated in the figures and specific language will be used to describe them. It will nevertheless be understood that no limitation of the scope of the disclosure is thereby intended. Such alterations and further modifications in the illustrated system, and such further applications of the principles of the disclosure as would normally occur to those skilled in the art are to be construed as being within the scope of the present disclosure. It will be understood by those skilled in the art that the foregoing general description and the following detailed description are exemplary and explanatory of the disclosure and are not intended to be restrictive thereof.
[0017] In the present document, the word “exemplary” is used herein to mean “serving as an example, instance, or illustration”. Any embodiment or implementation of the present subject matter described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.
[0018] While the disclosure is susceptible to various modifications and alternative forms, specific embodiment thereof has been shown by way of example in the drawings and will be described in detail below. It should be understood, however that it is not intended to limit the disclosure to the forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternative falling within the scope of the disclosure.
[0019] The terms “comprises”, “comprising”, “includes”, “including” or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a setup, device or method that includes a list of components or steps does not include only those components or steps but may include other components or steps not expressly listed or inherent to such setup or device or method. In other words, one or more elements in a system or apparatus proceeded by “comprises… a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or method.
[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this disclosure belongs. The system, methods, and examples provided herein are only illustrative and not intended to be limiting.
[0021] In the following specification and the claims, reference will be made to a number of terms, which shall be defined to have the following meanings. The singular forms “a,” “an,” and “the” include plural references unless the context clearly dictates otherwise.
[0022] A description of an embodiment with several components in communication with each other does not imply that all such components are required. On the contrary, a variety of optional components are described to illustrate the wide variety of possible embodiments of the invention. In the following detailed description of the embodiments of the disclosure, reference is made to the accompanying drawings that form a part hereof, and in which are shown by way of illustration specific embodiments in which the disclosure may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the disclosure, and it is to be understood that other embodiments may be utilized and that changes may be made without departing from the scope of the present disclosure. The following description is, therefore, not to be taken in a limiting sense.
[0023] Embodiments of the present disclosure provide a hub motor for engagement with a testing equipment for improving mechanical stability and testing accuracy. The present disclosure provides a plurality of circumferentially spaced engagement apertures positioned closer to the shaft relative to an outer rotor rim, thereby reducing a perpendicular distance between an engagement interface and the rotational axis. Reduction in radial distance reduces a mechanical moment generated during rotation, thereby stabilizing interaction between the hub motor assembly and a chuck engagement assembly. Further, engagement between the plurality of circumferentially spaced engagement apertures and the chuck engagement assembly establishes a mechanical interlock that restricts unintended relative movement of the hub motor assembly during testing. The engagement interface reduces slip and vibration at a coupling interface and maintains positional stability during rotational operation. Furthermore, the fixation mechanism reduces transmission of mechanically induced disturbances arising from play or instability at a clamping interface. The engagement configuration limits amplification of torque fluctuations arising from mechanical factors, thereby improving consistency of measurement signals during testing operations involving variable torque conditions.
[0024] Referring now to the drawings, and more particularly to FIG. 1A through FIG. 4 where similar reference characters denote corresponding features consistently throughout the figures, there are shown preferred embodiments, and these embodiments are described in the context of the following exemplary system and/or method.
[0025] FIG. 1A illustrates exemplary schematic diagram representations of an isometric view of a hub motor 100 and a sectional view of plurality of circumferentially spaced engagement apertures 114 in a hub motor assembly 102, in accordance with an embodiment of the present disclosure. Further, FIG. 1A includes a part (a) depicting an isometric view of the hub motor 100 and a part (b) depicting a sectional view of a plurality of circumferentially spaced engagement apertures 114 (herein after interchangeably referred to as the engagement apertures 114 or the plurality of circumferentially spaced engagement apertures 114) in a hub motor assembly 102.
[0026] In an embodiment, the hub motor 100 may include a hub motor assembly 102, and a plurality of circumferentially spaced engagement apertures 114 in the hub motor assembly 102. Further, the hub motor assembly 102 may include a rotor assembly 104, a stator assembly 106, a shaft 108, a Non-Connection End (NCE) cover 110, and a brake drum structure 112. Further, the shaft 108 may be aligned along a rotational axis of the hub motor 100. The stator assembly 106 may be disposed around the shaft 108. Further, the rotor assembly 104 may be disposed radially outward of the stator assembly 106. Furthermore, the brake drum structure 112 may be associated with an axial end of the rotor assembly 104. Additionally, the NCE cover 110 may be associated with the brake drum structure 112. Further, the plurality of circumferentially spaced engagement apertures 114 may be disposed in the NCE cover 110 around a rotational axis at a radial distance from the shaft 108. The illustrated configuration represents one exemplary arrangement of the plurality of circumferentially spaced engagement apertures 114 formed on a Non-Connection End (NCE) cover; however, alternative configurations may be implemented in other embodiments.
[0027] Further, the plurality of circumferentially spaced engagement apertures 114 may be configured to receive a chuck engagement assembly (not shown in FIG. 1A) positioned in a testing equipment (not shown in FIG. 1A). The chuck engagement assembly may include a chuck body (not shown in FIG. 1A) and a plurality of engagement projections (not shown in FIG. 1A) configured for insertion into the plurality of circumferentially spaced engagement apertures 114 for rotational fixation of the hub motor assembly 102 relative to the testing equipment.
[0028] In an embodiment, the rotor assembly 104 may include a rotor carrier mounted coaxially around the stator assembly 106 and a plurality of rotor permanent magnets disposed on an inner circumferential surface of the rotor carrier. The stator assembly 106 may comprise a stator core and a plurality of stator windings arranged within stator slots of the stator core. The rotor assembly 104 and the stator assembly 106 may be positioned within the brake drum structure 112. The brake drum structure 112 forms an outer housing portion of the hub motor assembly 102. The shaft 108 may extend through the stator assembly 106 and may be configured for mounting to a support structure.
[0029] In an embodiment, the NCE cover 110 may be positioned on a side of the hub motor assembly 102 opposite to a connection end configured for electrical connection of the stator assembly 106. The NCE cover 110 may include a plate portion extending radially from a central region adjacent to the shaft 108 toward an inner surface of the brake drum structure 112. The plurality of circumferentially spaced engagement apertures 114 may be formed in the plate portion of the NCE cover 110 at a predetermined radial distance from the shaft 108 within an inner radial region of the brake drum structure 112.
[0030] In an embodiment, each engagement aperture of the plurality of circumferentially spaced engagement apertures 114 may extend through a thickness of the NCE cover 110 along a direction substantially parallel to the shaft 108. Each engagement aperture may include an entrance region defined on a side of the NCE cover 110 facing a testing equipment and a seating region defined toward an opposite side of the NCE cover 110. The plurality of circumferentially spaced engagement apertures 114 may be arranged at substantially equal angular intervals around the shaft 108. In one example, the plurality of circumferentially spaced engagement apertures 114 may include eight engagement apertures.
[0031] In an embodiment, the plurality of circumferentially spaced engagement apertures 114 may be positioned at a radial distance from the shaft 108 less than a radial distance of an inner surface of the brake drum structure 112 forming an outer circumferential region of the hub motor assembly 102. The plurality of circumferentially spaced engagement apertures 114 may be located in a region of the NCE cover 110 corresponding to a central load-bearing zone of the hub motor assembly 102 associated with the shaft 108, the stator assembly 106, and a central support structure of the rotor assembly 104. The NCE cover 110 may include reinforcement ribs or thickened portions extending between adjacent engagement apertures of the plurality of circumferentially spaced engagement apertures 114.
[0032] In an embodiment, during engagement with the testing equipment, the hub motor 100 may be positioned with the NCE cover 110 facing a chuck engagement assembly of the testing equipment. The chuck engagement assembly may be aligned relative to the hub motor 100 in correspondence with the plurality of circumferentially spaced engagement apertures 114. The chuck engagement assembly may be displaced along the rotational axis of the hub motor 100 to insert a plurality of engagement projections into respective engagement apertures of the plurality of circumferentially spaced engagement apertures 114 for establishing rotational fixation of the hub motor assembly 102 relative to the testing equipment.
[0033] In an embodiment, the engagement apertures 114 may be provided as at least one of, but not limited to through-holes, blind recesses, profiled slots, keyed engagement cavities, and the like, configured for mechanical coupling with a corresponding engagement structure of the testing equipment. In an alternative embodiment, the engagement apertures 114 may include non-circular geometries including polygonal profiles, spline-based interfaces, or asymmetric locking contours to restrict relative rotational movement. In another embodiment, the engagement apertures 114 may be formed as partially enclosed grooves or stepped cavities configured for axial insertion followed by rotational locking.
[0034] In an embodiment, the engagement apertures 114 may be formed integrally with the NCE cover 110 through at least one of, but not limited to, casting, forging, additive manufacturing processes, and the like. In an alternative embodiment, the engagement apertures 114 may be formed through post-processing operations comprising machining, milling, broaching, or electrical discharge machining. In a further embodiment, inserts or bushings comprising wear-resistant materials may be positioned within the engagement apertures 114 to enhance durability during repeated engagement cycles.
[0035] In an embodiment, the plurality of circumferentially spaced engagement apertures 114 may be arranged in a uniform angular distribution along a circumferential path defined on the NCE cover 110. The plurality of circumferentially spaced engagement apertures 114 may include, for example, eight engagement apertures separated by an angular spacing of, for example, forty-five degrees relative to adjacent engagement apertures. The circumferential arrangement may define a circular engagement interface concentric with the rotational axis of the shaft 108.
[0036] In an embodiment, each of the plurality of circumferentially spaced engagement apertures 114 may include an aperture opening extending from an inner surface of the NCE cover 110 into a depth region defined within the NCE cover 110. Each engagement aperture of the plurality of circumferentially spaced engagement apertures 114 may further include engagement wall surfaces configured for mechanical interaction with corresponding engagement projections of the chuck engagement assembly. In an implementation, the aperture opening may include at least one of a chamfered entry profile, a tapered entry profile, and the like, configured for guiding insertion of the engagement projections into the engagement apertures 114.
[0037] In an embodiment, the plurality of circumferentially spaced engagement apertures 114 may be positioned at a radial location closer to the shaft 108 relative to an outer peripheral surface of the brake drum structure 112 or the rotor assembly 104. The reduced radial positioning may define a shorter perpendicular distance between an engagement interface and the rotational axis, thereby influencing a moment generated during rotation of the hub motor 100.
[0038] In an embodiment, the NCE cover 110 may include a generally circular plate structure mounted to the brake drum structure 112. The plurality of circumferentially spaced engagement apertures 114 may be formed integrally with the NCE cover 110 or may be formed through a machining operation performed on the NCE cover 110 after assembly. The NCE cover 110 may be manufactured from, but not limited to, a metallic material comprising at least one of, but not limited to, an aluminium alloy, a steel alloy, a cast iron, and the like. In an embodiment, the plurality of circumferentially spaced engagement apertures 114 may be configured for repeated engagement and disengagement with the chuck engagement assembly during multiple testing cycles. The engagement wall surfaces of the engagement apertures 114 may include surface treatment or hardening to maintain dimensional stability during repeated mechanical interaction.
[0039] In an embodiment, during operation in a testing environment, the chuck engagement assembly may be aligned with the plurality of circumferentially spaced engagement apertures 114 prior to insertion. Upon alignment, the engagement projections may be displaced toward the NCE cover 110 and inserted into the plurality of circumferentially spaced engagement apertures 114 to establish a rotational coupling between the hub motor assembly 102 and the testing equipment.
[0040] In an embodiment, the rotational coupling established through the plurality of circumferentially spaced engagement apertures 114 may constrain rotational movement between the hub motor assembly 102 and the chuck engagement assembly during a testing operation. The engagement interface defined by the plurality of circumferentially spaced engagement apertures 114 may maintain positional stability of the hub motor assembly 102 relative to the testing equipment during application of rotational torque. In an embodiment, after completion of the testing operation, the chuck engagement assembly may be actuated in a reverse direction to withdraw the engagement projections from the plurality of circumferentially spaced engagement apertures 114. Following disengagement, the hub motor assembly 102 may be removed from the testing equipment for subsequent handling or processing.
[0041] Those skilled in the art will recognize that, for simplicity and clarity, the full structure and operation of the hub motor 100 suitable for use with the present disclosure are not being depicted or described herein. Instead, only so much of the hub motor assembly 102 as is unique to the present disclosure or necessary for an understanding of the present disclosure is depicted and described. The remainder of the construction and operation of the hub motor assembly 102 may conform to any of the various current implementations and practices that were known in the art.
[0042] FIG. 1B illustrates exemplary schematic diagram representations of a front view of a hub motor 100 and a plurality of circumferentially spaced engagement apertures 114, in accordance with an embodiment of the present disclosure. Further, FIG. 1B includes part (a) depicting a front view of the hub motor assembly 102 and part (b) depicting a cross-sectional view of the NCE cover 110 with the plurality of circumferentially spaced engagement apertures 114. The illustrated arrangement represents an engagement interface configured for interaction with the chuck engagement assembly of the testing equipment.
[0043] In an embodiment, the plurality of circumferentially spaced engagement apertures 114 may be arranged as a set of circumferentially distributed slots on the NCE cover 110 within the brake drum structure 112. In an implementation, the plurality of circumferentially spaced engagement apertures 114 may include, for example, eight slots distributed at substantially equal angular intervals. In alternative embodiments, the plurality of circumferentially spaced engagement apertures 114 may comprise a different number of apertures, comprising four, six, ten, twelve, or another predefined number, based on torque transmission requirements or fixture compatibility.
[0044] In an embodiment, the front view of part (a) may illustrate a concentric arrangement of the shaft 108, the stator assembly 106, the rotor assembly 104, and the brake drum structure 112, with the plurality of circumferentially spaced engagement apertures 114 positioned around the shaft 108. The plurality of circumferentially spaced engagement apertures 114 may define a circular engagement pattern concentric with the rotational axis of the hub motor 100.
[0045] In an embodiment, each engagement aperture of the plurality of circumferentially spaced engagement apertures 114 may include an aperture opening, an aperture depth region, and engagement wall surfaces configured for mechanical interaction with a plurality of engagement projections (not shown in FIG. 1B) of the chuck engagement assembly (not shown in FIG. 1B). The engagement wall surfaces may be oriented to provide surface contact for transmission of torque between the chuck engagement assembly and the hub motor assembly 102.
[0046] In an embodiment, the aperture opening may include a chamfered, radiused, or tapered profile configured for guiding insertion of the engagement projections 206. In alternative embodiments, the engagement apertures 114 may comprise non-circular internal profiles, comprising polygonal shapes, spline profiles, keyed interfaces, or multi-step geometries configured to restrict relative rotational displacement.
[0047] In an embodiment, the NCE cover 110 may include a circular plate structure mounted to the hub motor assembly 102 and supporting the plurality of circumferentially spaced engagement apertures 114. The NCE cover 110 may further include a central bore configured to receive the shaft 108. The central bore may be aligned with the rotational axis of the hub motor 100 and may be configured for accommodating bearing elements or sealing components in alternative implementations. In an embodiment, the NCE cover 110 may include a uniform thickness across the plate structure. In alternative embodiments, the NCE cover 110 may include localized thickened regions, reinforcement ribs, or annular strengthening portions extending between adjacent engagement apertures 114 to maintain structural integrity during engagement operations.
[0048] In an embodiment, the plurality of circumferentially spaced engagement apertures 114 may be positioned at a radial distance from the rotational axis less than a radial distance of an outer circumferential surface of the rotor assembly 104. The plurality of circumferentially spaced engagement apertures 114 may therefore be located in an inner radial region of the hub motor assembly 102 corresponding to a central structural zone associated with the shaft 108 and the stator assembly 106. In alternative embodiments, the radial position of the plurality of circumferentially spaced engagement apertures 114 may be varied based on structural design constraints, torque transmission characteristics, or compatibility with different chuck engagement assemblies. The engagement apertures 114 may be arranged along a single circumferential path or along multiple concentric circumferential paths in further implementations.
[0049] In an embodiment, part (b) of FIG. 1B may illustrate dimensional characteristics of the plurality of circumferentially spaced engagement apertures 114, comprising aperture width, depth, and spacing between adjacent apertures. The cross-sectional representation may further illustrate engagement interfaces between the engagement apertures 114 and corresponding engagement projections of the chuck engagement assembly. In alternative embodiments, the plurality of circumferentially spaced engagement apertures 114 may include stepped depth profiles, undercut regions, or multi-stage engagement surfaces configured for sequential engagement with the engagement projections. In further embodiments, inserts comprising hardened materials or replaceable wear components may be positioned within the engagement apertures 114.
[0050] Those skilled in the art will recognize that, for simplicity and clarity, not all structural elements of the hub motor assembly 102 are illustrated in FIG. 1B. Only elements relevant to the engagement interface and fixation arrangement are depicted. Remaining structural components of the hub motor assembly 102 may be implemented in accordance with known configurations and design practices.
[0051] FIG. 2 illustrates exemplary pictorial diagram representations of cross-sectional views depicting a plurality of stages 200 of assembling the hub motor 100 to the testing equipment via a chuck engagement assembly 202, in accordance with an embodiment of the present disclosure. Further, FIG. 2 includes a sequence of stages 200 represented as part (a), part (b), part (c), and part (d), depicting progressive engagement between the hub motor 100 and the chuck engagement assembly 202. The illustrated sequence represents one exemplary engagement procedure, and alternative sequences or configurations may be implemented in other embodiments.
[0052] In an embodiment, the stages 200 depicted in FIG. 2 may correspond to an automated or semi-automated assembly process performed within a testing fixture. In alternative embodiments, the stages 200 may be executed through manual positioning or hybrid systems combining manual alignment and powered engagement mechanisms. In an embodiment, part (a) may depict an initial alignment stage between the hub motor assembly 102 and the chuck engagement assembly 202. The hub motor assembly 102 may be positioned with the shaft 108 aligned along a rotational axis of the chuck engagement assembly 202. The NCE cover 110 may face the chuck engagement assembly 202, with the plurality of circumferentially spaced engagement apertures 114 oriented toward corresponding engagement projections 206. In an embodiment, alignment may be achieved through mechanical guides, positioning fixtures, or robotic handling systems. In alternative embodiments, alignment may be assisted through sensor-based systems comprising optical sensors, proximity sensors, or encoder-based angular positioning mechanisms.
[0053] In an embodiment, part (b) may depict an isometric view of the chuck engagement assembly 202 prior to insertion into the hub motor assembly 102. The chuck engagement assembly 202 may comprise a chuck body 204 and a plurality of engagement projections 206 extending radially from the chuck body 204. The plurality of engagement projections 206 may be positioned for alignment with the plurality of circumferentially spaced engagement apertures 114 disposed in the NCE cover 110. The plurality of circumferentially spaced engagement apertures 114 may occupy a radial position closer to the rotational axis of the shaft 108 relative to an outer rotor rim of the hub motor assembly 102. The plurality of circumferentially spaced engagement apertures 114 may further comprise chamfered entry regions configured for guiding insertion of the plurality of engagement projections 206. In alternative embodiments, the engagement projections 206 may comprise tapered tips, radiused edges, or profiled geometries configured for facilitating guided insertion into the plurality of circumferentially spaced engagement apertures 114.
[0054] In an embodiment, part (c) may depict a perspective view of an insertion stage, in which the hub motor assembly 102 and the chuck engagement assembly 202 are displaced relative to each other along the rotational axis. During insertion, the plurality of engagement projections 206 may enter corresponding engagement apertures of the plurality of circumferentially spaced engagement apertures 114. Each engagement aperture may comprise a side wall region configured to cooperate with a complementary side surface of a corresponding engagement projection 206. The side wall region and the complementary side surface may define an interface for transmission of rotational torque between the chuck engagement assembly 202 and the hub motor assembly 102. In alternative embodiments, the insertion process may involve radial displacement of the engagement projections 206 toward the plurality of circumferentially spaced engagement apertures 114 through an actuation mechanism comprising a pneumatic actuator, hydraulic actuator, or electromechanical actuator.
[0055] In an embodiment, part (d) may depict an engaged state following completion of the insertion process, wherein the hub motor assembly 102 is coupled with the chuck engagement assembly 202. The plurality of engagement projections 206 may be fully seated within the plurality of circumferentially spaced engagement apertures 114. Each engagement aperture may comprise a bottom wall region configured to limit insertion depth of the plurality of engagement projections 206. The bottom wall region may define a seating interface for axial positioning of the hub motor assembly 102 relative to the chuck engagement assembly 202.
[0056] In an embodiment, the engaged state may establish rotational fixation between the hub motor assembly 102 and the chuck engagement assembly 202. In alternative embodiments, additional locking mechanisms comprising axial clamps, retaining rings, or secondary locking elements may be employed in conjunction with the plurality of circumferentially spaced engagement apertures 114 to maintain engagement during operation.
[0057] FIG. 3 illustrates an exemplary pictorial diagram representation of a side view of aligning the hub motor 100 with the chuck engagement assembly 202 of a testing equipment, in accordance with an embodiment of the present disclosure. The illustrated side view depicts a relative positional arrangement between the hub motor assembly 102 and the chuck engagement assembly 202 after the engagement. The configuration represents an initial alignment stage post insertion of engagement projections into a plurality of circumferentially spaced engagement apertures 114.
[0058] In an embodiment, the hub motor assembly 102 may be oriented along a rotational axis corresponding to a rotational axis of the chuck engagement assembly 202. The shaft 108 of the hub motor assembly 102 may be aligned coaxially with a central axis of the chuck engagement assembly 202. The NCE cover 110 may face the chuck engagement assembly 202, with the plurality of circumferentially spaced engagement apertures 114 positioned for engagement with corresponding engagement projections of the chuck engagement assembly 202. In an embodiment, the plurality of circumferentially spaced engagement apertures 114 may be configured for receiving the chuck engagement assembly 202 positioned in the testing equipment. The chuck engagement assembly 202 may comprise a chuck body and a plurality of engagement projections extending toward the hub motor assembly 102. The engagement projections may be arranged in a pattern corresponding to the plurality of circumferentially spaced engagement apertures 114.
[0059] In an embodiment, alignment between the plurality of circumferentially spaced engagement apertures 114 and the plurality of engagement projections may be achieved through relative rotational adjustment between the hub motor assembly 102 and the chuck engagement assembly 202. In alternative embodiments, alignment may be achieved through indexed positioning, keyed alignment interfaces, or sensor-assisted positioning systems. In an embodiment, the side view may depict an axial spacing between the hub motor assembly 102 and the chuck engagement assembly 202 after the engagement. The axial spacing may define a clearance distance allowing alignment of the plurality of circumferentially spaced engagement apertures 114 with the plurality of engagement projections. The chuck engagement assembly 202 and the hub motor assembly 102 may be displaced toward each other along the rotational axis to initiate engagement.
[0060] In alternative embodiments, displacement may be performed by movement of the chuck engagement assembly 202, movement of the hub motor assembly 102, or simultaneous movement of both components through a controlled positioning system. In an embodiment, the alignment stage depicted in FIG. 3 may be performed in a testing environment comprising a fixture, a base frame, and a positioning system configured for supporting the hub motor assembly 102. The positioning system may comprise mechanical guides, rails, or fixtures configured for maintaining axial and radial alignment during engagement. In alternative embodiments, the alignment stage may be performed through robotic handling systems comprising articulated robotic arms or gantry systems configured for positioning the hub motor assembly 102 relative to the chuck engagement assembly 202.
[0061] In an embodiment, the side view may further illustrate relative positioning of structural elements of the hub motor assembly 102, comprising the brake drum structure 112, the NCE cover 110, and the shaft 108, with respect to the chuck engagement assembly 202. The plurality of circumferentially spaced engagement apertures 114 may be located on the NCE cover 110 within an inner radial region, positioned for engagement with the engagement projections of the chuck engagement assembly 202. In alternative embodiments, auxiliary alignment features comprising guide pins, tapered alignment surfaces, or centering cones may be employed to facilitate alignment between the hub motor assembly 102 and the chuck engagement assembly 202 prior to engagement.
[0062] FIG. 4 illustrates an exemplary pictorial diagram representation of front view of a hub motor 100 with a hub motor assembly 102 for engagement with a testing equipment 400, in accordance with an embodiment of the present disclosure. The illustrated front view depicts the hub motor assembly 102 in an engaged or engagement-ready configuration relative to a chuck engagement assembly 202 associated with the testing equipment 400. The arrangement represents a configuration for transmission of rotational input and measurement of operational parameters during testing.
[0063] In an embodiment, the front view may depict the NCE cover 110 positioned toward the testing equipment 400, with a plurality of circumferentially spaced engagement apertures 114 arranged concentrically around the shaft 108. The plurality of circumferentially spaced engagement apertures 114 may correspond to a plurality of engagement projections of the chuck engagement assembly 202 for establishing a rotational interface. In an embodiment, the testing equipment 400 may comprise a dynamometer coupled to the chuck body 204 of the chuck engagement assembly 202. The dynamometer may be configured for transmitting rotational torque between a rotational drive system and the hub motor assembly 102 during operation. The chuck engagement assembly 202 may transfer torque from the dynamometer to the hub motor assembly 102 through engagement between the plurality of engagement projections and the plurality of circumferentially spaced engagement apertures 114.
[0064] In an embodiment, the dynamometer may operate in a drive mode or a load mode, in which rotational input or resistive torque may be applied to the hub motor assembly 102. In alternative embodiments, the dynamometer may be configured for bidirectional torque application and measurement. In an embodiment, the front view may depict a concentric alignment between the shaft 108, the stator assembly 106, the rotor assembly 104, and the chuck engagement assembly 202. The plurality of circumferentially spaced engagement apertures 114 may define a circular engagement interface centered about the rotational axis, enabling uniform distribution of torque during operation. In an alternative embodiment, the plurality of circumferentially spaced engagement apertures 114 may be arranged in non-uniform angular spacing or asymmetric patterns based on application-specific torque transmission requirements.
[0065] In an embodiment, the engagement between the chuck engagement assembly 202 and the hub motor assembly 102 may establish a rotational coupling configured for transmitting torque without relative slip at the interface. The engagement interface may be defined by contact between engagement wall surfaces of the plurality of circumferentially spaced engagement apertures 114 and corresponding surfaces of the engagement projections of the chuck engagement assembly 202. In alternative embodiments, additional coupling elements comprising intermediate adapters, coupling plates, or detachable interface rings may be positioned between the chuck engagement assembly 202 and the hub motor assembly 102.
[0066] In an embodiment, the testing equipment 400 may further include a sensor system configured for measurement of operational parameters during rotation of the hub motor assembly 102. The sensor system may comprise a torque sensor, a rotational speed sensor, and a vibration sensor positioned relative to the hub motor assembly 102 or the chuck engagement assembly 202. In alternative embodiments, additional measurement systems comprising temperature sensors, current sensors, or displacement sensors may be employed for monitoring operational conditions during testing.
[0067] In an embodiment, the front view depicted in FIG. 4 may further illustrate structural components of the hub motor assembly 102 including the brake drum structure 112 and the NCE cover 110. The plurality of circumferentially spaced engagement apertures 114 may be located within an inner radial region of the NCE cover 110 relative to an outer circumferential surface of the rotor assembly 104. In alternative embodiments, protective covers, enclosures, or shielding structures may be provided around the testing equipment 400 to enclose the engagement region during operation.
[0068] Various embodiments of the present disclosure provide a hub motor for engagement with a testing equipment for improving mechanical stability and testing accuracy. The present disclosure provides a plurality of circumferentially spaced engagement apertures 114 positioned closer to the shaft 108 relative to an outer rotor rim, thereby reducing a perpendicular distance between an engagement interface and the rotational axis. Reduction in radial distance reduces a mechanical moment generated during rotation, thereby stabilizing interaction between the hub motor assembly 102 and a chuck engagement assembly 202. Further, engagement between the plurality of circumferentially spaced engagement apertures 114 and the chuck engagement assembly 202 establishes a mechanical interlock that restricts unintended relative movement of the hub motor assembly 102 during testing. The engagement interface reduces slip and vibration at a coupling interface and maintains positional stability during rotational operation. Furthermore, the fixation mechanism reduces transmission of mechanically induced disturbances arising from play or instability at a clamping interface. The engagement configuration limits amplification of torque fluctuations arising from mechanical factors, thereby improving consistency of measurement signals during testing operations involving variable torque conditions.
[0069] Additionally, positioning of the engagement interface in proximity to a central region of the hub motor assembly 102 corresponds to a load-bearing zone associated with the shaft 108 and the stator assembly 106. The configuration distributes mechanical loads along a structural axis of the hub motor assembly 102 and reduces bending moments during operation under load conditions. The plurality of circumferentially spaced engagement apertures 114 enables repeatable engagement with the chuck engagement assembly 202, reducing variation associated with alignment and coupling. The engagement configuration supports consistent positioning of the hub motor assembly 102 during repeated testing cycles. Further, the fixation mechanism supports coupling and decoupling operations between the hub motor assembly 102 and the chuck engagement assembly 202 through axial insertion and disengagement. The configuration is compatible with automated handling systems comprising robotic positioning units and controlled actuation mechanisms. Furthermore, the engagement interface reduces localized stress concentration associated with friction-based clamping methods. The plurality of circumferentially spaced engagement apertures 114 distributes contact forces across multiple engagement regions, reducing wear at individual contact surfaces during repeated engagement cycles.
[0070] In addition, the fixation mechanism is adaptable to different hub motor configurations through variation in number, geometry, and radial positioning of the plurality of circumferentially spaced engagement apertures 114. The configuration enables compatibility with different chuck engagement assemblies and testing equipment. The hub motor assembly 102 configured with the plurality of circumferentially spaced engagement apertures 114 enables stable transmission of rotational torque between a dynamometer and the hub motor assembly 102 during testing. The engagement interface maintains coupling integrity under dynamic operating conditions comprising acceleration, load variation, and rotational speed changes.
[0071] The written description describes the subject matter herein to enable any person skilled in the art to make and use the embodiments. The scope of the subject matter embodiments is defined by the claims and may include other modifications that occur to those skilled in the art. Such other modifications are intended to be within the scope of the claims if they have similar elements that do not differ from the literal language of the claims or if they include equivalent elements with insubstantial differences from the literal language of the claims.
[0072] A description of an embodiment with several components in communication with each other does not imply that all such components are required. On the contrary, a variety of optional components are described to illustrate the wide variety of possible embodiments of the invention. When a single device or article is described herein, it will be apparent that more than one device/article (whether they cooperate) may be used in place of a single device/article. Similarly, where more than one device or article is described herein (whether or not they cooperate), it will be apparent that a single device/article may be used in place of the more than one device or article or a different number of devices/articles may be used instead of the shown number of devices or programs. The functionality and/or the features of a device may be alternatively embodied by one or more other devices which are not explicitly described as having such functionality/features. Thus, other embodiments of the invention need not include the device itself.
[0073] The illustrated steps are set out to explain the exemplary embodiments shown, and it should be anticipated that ongoing technological development will change the manner in which particular functions are performed. These examples are presented herein for purposes of illustration, and not limitation. Further, the boundaries of the functional building blocks have been arbitrarily defined herein for the convenience of the description. Alternative boundaries can be defined so long as the specified functions and relationships thereof are appropriately performed. Alternatives (including equivalents, extensions, variations, deviations, etc., of those described herein) will be apparent to persons skilled in the relevant art(s) based on the teachings contained herein. Such alternatives fall within the scope and spirit of the disclosed embodiments. Also, the words “comprising”, “having”, “containing”, and “including”, and other similar forms are intended to be equivalent in meaning and be open-ended in that an item or items following any one of these words is not meant to be an exhaustive listing of such item or items, or meant to be limited to only the listed item or items. It must also be noted that as used herein and in the appended claims, the singular forms “a”, “an”, and “the” include plural references unless the context clearly dictates otherwise.
[0074] Finally, the language used in the specification has been principally selected for readability and instructional purposes, and it may not have been selected to delineate or circumscribe the inventive subject matter. It is therefore intended that the scope of the invention be limited not by this detailed description, but rather by any claims that issue on an application based here on. Accordingly, the embodiments of the present invention are intended to be illustrative, but not limiting, of the scope of the invention, which is set forth in the following claims.
, Claims:CLAIMS
We claim:
1. A hub motor (100) for engagement with a testing equipment, comprising:
a hub motor assembly (102) comprising:
a shaft (108) aligned along a rotational axis;
a stator assembly (106) disposed around the shaft (108);
a rotor assembly (104) radially outward of the stator assembly (106);
a brake drum structure (112) associated with an axial end of the rotor assembly (104); and
a Non-Connection End (NCE) cover (110) associated with the brake drum structure (112);
a plurality of circumferentially spaced engagement apertures (114) disposed in the NCE cover (110) around a rotational axis at a radial distance from the shaft (108);
wherein the plurality of circumferentially spaced engagement apertures (114) is configured to receive a chuck engagement assembly (202) positioned in a testing equipment, and wherein the chuck engagement assembly (202) comprises a chuck body (204) and a plurality of engagement projections (206) configured for insertion into the plurality of circumferentially spaced engagement apertures (114) for rotational fixation of the hub motor assembly (102) relative to the testing equipment.
2. The hub motor (100) as claimed in claim 1, wherein the plurality of circumferentially spaced engagement apertures (114) comprises an aperture opening, an aperture depth region, and engagement wall surfaces configured for mechanical interaction with a plurality of engagement projections (206) of the chuck engagement assembly (202).
3. The hub motor (100) as claimed in claim 1, wherein the plurality of circumferentially spaced engagement apertures (114) is configured to receive a chuck engagement assembly (202) positioned in a testing equipment further comprises transmitting torque between a rotational drive of a dynamometer coupled to the chuck body (204), and the hub motor assembly (102) during rotation of the chuck engagement assembly (202).
4. The hub motor (100) as claimed in claim 1, wherein the plurality of circumferentially spaced engagement apertures (114) occupies a radial position closer to the rotational axis of the shaft (108) relative to an outer rotor rim of the hub motor assembly (102).
5. The hub motor (100) as claimed in claim 1, wherein the plurality of circumferentially spaced engagement apertures (114) comprises chamfered entry regions configured for guided insertion of a plurality of engagement projections (206) of the chuck engagement assembly (202).
6. The hub motor (100) as claimed in claim 1, wherein the plurality of circumferentially spaced engagement apertures (114) comprises a side wall region cooperating with a complementary side surface of a plurality of engagement projections (206) of the chuck engagement assembly (202).
7. The hub motor (100) as claimed in claim 1, wherein NCE cover (110) comprises a central bore to receive the shaft (108).
8. The hub motor (100) as claimed in claim 1, wherein the plurality of circumferentially spaced engagement apertures (114) comprises a bottom wall region to limit insertion depth of a plurality of engagement projections (206) of the chuck engagement assembly (202).
9. The hub motor (100) as claimed in claim 1, wherein the plurality of

circumferentially spaced engagement apertures (114) is positioned at a radial distance from the rotational axis less than a radial distance of an outer circumferential surface of the rotor assembly (104).