DESC:SEGMENTED ELECTRIC MOTOR
CROSS-REFERENCE TO RELATED APPLICATIONS
The present application claims priority from Indian Provisional Patent Application No. 202221056422 filed on 30/09/2022, the entirety of which is incorporated herein by a reference. 5
TECHNICAL FIELD
The present disclosure generally relates to an electric motor. Particularly, the present disclosure relates to a segmented electric motor.
BACKGROUND
Electric motors use electrical energy to produce mechanical energy for producing 10 power output, typically through the interaction between the magnetic fields and current-carrying conductors. In the modern world, the variable power outputs of the electric motor are desired in various applications e.g., while driving an automotive vehicle, controlling the operation of robots, in medical devices like body implants, in aerospace applications demanding high temperatures and vibrations, etc. 15
The construction and design characteristics of electric motors are fixed. In the stator assembly design, the number of stator slots and winding phases, stator winding layout, winding type, slot shape, and winding distribution are fixed during the design and construction of the motor. Similarly, in the rotor assembly, the shape, size, and design of the rotor core and the rotor magnets are fixed during the design 20 and construction of the motor. In addition, the magnetic materials utilized in the various components of the motor have fixed magnetic permeability, thus, resulting in fixed power output. However, for different applications, different power outputs are required from the electric motor. In some cases, the power output requirement from the electric motor is even higher than the maximum power output of the 25 particular motor. In such situations, the particular electric motor is required to be replaced with another electric motor having a higher power output. Such
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replacement of the electric motor becomes unfeasible due to the size limitations. Furthermore, the replacement of the electric motor would be uneconomical.
A solution to the abovementioned problem involves switching in multispeed motors that utilize multiple sets of windings in accordance with the power output demand during the application. However, such motors demand a sophisticated controlling 5 system and electric circuit that increases the cost of such motors. Furthermore, such motors are bulky and heavy as well as difficult to maintain. Moreover, such motors are not practical for applications where the size of the motor is required to be compact.
Another solution involves changing rotor magnets in a permanent magnet motor to 10 a higher-grade magnet for extracting a greater amount of power from the existing motor. However, the process of changing the rotor magnets involves disassembly and assembly of various components of the motor, which is time-consuming and tedious. Furthermore, the limitation of core saturation inhibits the passage of increased magnetic flux generated using the higher-grade magnets. In other words, 15 after a threshold limit, the increased magnetic flux would not increase the power output of the electric motor. Hence changing the magnets alone to extract higher power, is not a viable alternative.
Moreover, the thermals of the electric motor are designed based on the power output of the electric motor, thus, increased power output of the motor would result in 20 heating of the electric motor. The heating of the motor may result in inefficient operation and reduced service life of the motor.
Therefore, there exists a need for an electric motor, with an improved design that overcomes one or more problems associated with the electric motors as set forth above. 25
SUMMARY
An object of the present disclosure is to provide a motor, with a segmental design.
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Yet another object of the present disclosure is to provide a motor with efficient cooling while delivering a higher power output.
In accordance with the first aspect of the present disclosure, there is provided a segmented electric motor comprising a stationary motor shaft, a stator assembly, and a rotor assembly. The stator assembly comprises of a stator core and a plurality 5 of stator teeth. The stator assembly is mounted on the stationary motor shaft. The rotor assembly comprises of a top rotor casing, a bottom rotor casing, and a magnetic ring. The magnetic ring comprises of a plurality of magnets and a ring of variable permeability material. The top rotor casing comprises of a plurality of blades on a casing face to channel air inside the top rotor casing during the operation 10 of the motor.
The motor is an improved design with ease of assembly and disassembly. The motor as disclosed in the present disclosure is advantageous in terms of providing a segmented design for easy replacement of the components of the motor. Furthermore, the motor as disclosed in the present disclosure is easy to assemble 15 and disassemble. The disclosed motor enables the assembly and disassembly of the elements of the rotor assembly. The motor may be beneficially utilized for wider power output applications. Furthermore, the stator assembly is obtained from the assembly of a number of individual stator teeth over the stator core enabling quicker assembly and disassembly of the stator assembly enabling changing of the tooth 20 and core independently as per the application requirement. Furthermore, the motor is equipped with design features to mitigate the heating issues arising within the motor due to increased power output. Beneficially, the motor possesses enhanced service life.
Additional aspects, advantages, features, and objects of the present disclosure 25 would be made apparent from the drawings and the detailed description of the illustrative embodiments constructed in conjunction with the appended claims that follow.
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It will be appreciated that features of the present disclosure are susceptible to being combined in various combinations without departing from the scope of the present disclosure as defined by the appended claims.
BRIEF DESCRIPTION OF DRAWINGS
The summary above, as well as the following detailed description of illustrative 5 embodiments, is better understood when read in conjunction with the appended drawings. For the purpose of illustrating the present disclosure, exemplary constructions of the disclosure are shown in the drawings. However, the present disclosure is not limited to specific methods and instrumentalities disclosed herein. Moreover, those in the art will understand that the drawings are not to scale. 10 Wherever possible, like elements have been indicated by identical numbers.
Embodiments of the present disclosure will now be described, by way of example only, with reference to the following diagrams wherein:
FIG. 1 illustrates an exploded view of a segmented electric motor, in accordance with an embodiment of the present disclosure. 15
FIG. 2a illustrates a perspective view of a top rotor casing, in accordance with an embodiment of the present disclosure.
FIG. 2b illustrates an enlarged view of a section of casing face, in accordance with an embodiment of the present disclosure.
FIG. 2c illustrates an enlarged view of a section of casing wall, in accordance with 20 an embodiment of the present disclosure.
FIG. 3a illustrates an exploded view of a rotor assembly, in accordance with an embodiment of the present disclosure.
FIG. 3b illustrates a cross-sectional view of a rotor assembly, in accordance with an embodiment of the present disclosure. 25
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FIG. 4a illustrates an exploded view of a stator assembly, in accordance with an embodiment of the present disclosure.
FIG. 4b illustrates a perspective view of a stator tooth, in accordance with an embodiment of the present disclosure.
In the accompanying drawings, an underlined number is employed to represent an 5 item over which the underlined number is positioned or an item to which the underlined number is adjacent. A non-underlined number relates to an item identified by a line linking the non-underlined number to the item. When a number is non-underlined and accompanied by an associated arrow, the non-underlined number is used to identify a general item at which the arrow is pointing. 10
DETAILED DESCRIPTION
The following detailed description illustrates embodiments of the present disclosure and ways in which they can be implemented. Although some modes of carrying out the present disclosure have been disclosed, those skilled in the art would recognize that other embodiments for carrying out or practicing the present disclosure are also 15 possible.
The description set forth below in connection with the appended drawings is intended as a description of certain embodiments of a segmented electric motor and is not intended to represent the only forms that may be developed or utilized. The description sets forth the various structures and/or functions in connection with the 20 illustrated embodiments; however, it is to be understood that the disclosed embodiments are merely exemplary of the disclosure that may be embodied in various and alternative forms. The figures are not necessarily to scale; some features may be exaggerated or minimized to show details of particular components. Therefore, specific structural and functional details disclosed herein are not to be 25 interpreted as limiting, but merely as a representative basis for teaching one skilled in the art to variously employ the present invention.
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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 particular forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternatives 5 falling within the scope of the disclosure.
The terms “comprise”, “comprises”, “comprising”, “include(s)”, or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a setup, or system that comprises a list of components or steps does not include only those components or steps but may include other components or steps not expressly listed 10 or inherent to such setup or system. In other words, one or more elements in a system or apparatus preceded by “comprises... a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or apparatus.
In the following detailed description of the embodiments of the disclosure, 15 reference is made to the accompanying drawings 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 20 present disclosure. The following description is, therefore, not to be taken in a limiting sense.
The present disclosure will be described herein below with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the description 25 with unnecessary detail.
As used herein, the terms “electric motor”, “motor”, “surface permanent magnet motor”, “SPM motor”, “permanent magnet motor” and “SPM” are used interchangeably and refer to type of synchronous electric motor in which the
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permanent magnets are attached to the surface of the rotor, in a radial or axial arrangement. The magnets may be attached to the rotor by means of adhesives or mechanical fasteners. The magnets generate a magnetic field that interacts with the magnetic flux generated by the stator windings to produce the rotational motion of the rotor. The permanent magnet motor has high efficiency, and compact design 5 and is suitable for applications such as electric vehicles (EVs) and robotics.
As used herein, “stator” and “stator assembly” are used interchangeably and refer to the stationary part of the electric motor that generates a magnetic field for driving the rotating armature. The stator acts as a field magnet. The design of the stator is an important factor in deciding the performance of the motor such as efficiency, 10 power output, and torque generated in the motor.
As used herein, the terms “motor shaft”, “stationary motor shaft”, “stator shaft” and “shaft” are used interchangeably and refer to a stationary cylindrical component on which the stator assembly is mounted. The stationary shaft holds the stator firmly inside the motor. 15
As used herein, the term “stator core” refers to a segment of the stator assembly that provides a path for the magnetic field to flow from the stator windings to the rotor and provides a mechanical base for mounting stator teeth. The stator core may be made of ferromagnetic materials, such as iron or steel laminations. Alternatively, the core may be made from soft magnetic composite material. The design and 20 material selection of the stator core are critical factors in determining the efficiency as well as the performance of the electric motor.
As used herein, the term “locking notches” and “plurality of locking notches” refers to design feature on the stator core to secure stator teeth with the stator core. The locking notches are designed to complement a design feature on the stator teeth. 25
As used herein, the terms “stator tooth”, and “plurality of stator teeth” are used interchangeably and refer to a stator slot wedge that simultaneously holds the conductive windings in the slot for producing an electromagnetic field in the stator.
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As used herein, the term “locking protrusion” refers to design features on the stator teeth, complementary to the locking notches, for the fixing of the stator teeth on the stator core.
As used herein, “rotor” and “rotor assembly” are used interchangeably and refer to the rotating part of the electric motor that generates a magnetic field through 5 permanent magnets, for interacting with the stator’s magnetic field for the generation of the torque on the rotor. The rotor serves as the structural support for the permanent magnets and provides a path for the magnetic flux to circulate within the rotor. The physical dimensions of the rotor, including diameter and length, determine the physical size and power output of the motor. The rotor assembly of 10 the electric motor is designed in a segmented manner such that multiple components are combined together to form the rotor assembly.
As used herein, the term ‘top rotor casing’ refers to a component of the segmented rotor assembly that encloses the other components of the rotor assembly. Furthermore, the top rotor casing acts as the outer covering of the electric motor 15 and provides a protective enclosure for the motor's internal components, such as the windings, bearings, shaft, etc. The top rotor casing may contain design features to enable efficient cooling of the electric motor.
As used herein, the term ‘bottom rotor casing’ refers to another component of the segmented rotor assembly that complements the top rotor casing to enclose the 20 other components of the rotor assembly. Furthermore, the bottom rotor casing acts as the complementary outer covering of the electric motor and provides a protective enclosure for the motor's internal components, such as the windings, bearings, shaft, etc. The bottom rotor casing may contain design features to enable efficient cooling of the electric motor. 25
As used herein, the term “magnetic ring” refers to a component of the rotor assembly that enables the generation of the magnetic field in the rotor assembly. The magnetic ring may accommodate a plurality of magnets for the same.
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As used herein, the term “inner surface of the magnetic ring” refers to the inner surface of the magnetic ring facing the stator for confining and directing the magnetic field within the motor. The inner surface may comprise design features to accommodate the plurality of magnets.
As used herein, the term “outer surface of the magnetic ring” refers to the outer 5 surface of the magnetic ring facing away from the stator for confining and directing the magnetic field within the motor. The outer surface may comprise design features to accommodate a ring of variable permeability material.
As used herein, the term “magnet” and “plurality of magnets” refers to components of the electric motor to generate the continuous magnetic fields in the rotor for 10 interacting with the magnetic field of the stator.
As used herein, the term “casing face” refers to the flat surface of the top rotor casing. The casing face comprises design features to enable efficient cooling of the motor.
As used herein, the term “casing wall” refers to the cylindrical surface of the top 15 rotor casing. The casing wall comprises design features to enable efficient cooling of the motor.
As used herein, the term “bearing” refers to a component of the motor that reduces friction between the rotating component and the stationary component and hence ensuring the smooth operation of the motor. 20
As used herein, the term ‘ring of variable permeability material’ refers to the component of the rotor for sustaining the magnetic field inside the motor during the operation of the motor by preventing the leakage of magnetic flux.
As used herein, the terms “air filter” or “filter” are used interchangeably and refer to a filtering device for blocking undesired particles from entering the motor. 25
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As used herein, the terms “air inlet” or “air outlet” refer to openings or passages designed to facilitate the transfer of air through the motor, for regulation of temperature within the motor.
As used herein, the term ‘blades’ refers to the curved surfaces present perpendicular to the casing face of the top rotor casing that rotates along with the rotor during the 5 operation of the motor for channelizing ambient air in the motor for cooling of the motor.
As used herein, the term ‘fins’ refers to protruding or extended surfaces present on the cylindrical wall of the top rotor casing for enhancing the turbulence as well as surface area exposed to the ambient air in contact, to enhance heat dissipation from 10 the motor.
Figure 1, in accordance with an embodiment, describes a segmented electric motor 100 comprising a stationary motor shaft 102, a stator assembly 104 and a rotor assembly 110. The stator assembly 104 comprises of a stator core 106 and a plurality of stator teeth 108. The stator assembly 104 is mounted on the stationary 15 motor shaft 102. The rotor assembly 110 comprises of a top rotor casing 112, a bottom rotor casing 114, and a magnetic ring 116. The magnetic ring 116 comprises of a plurality of magnets 118 and a ring of variable permeability material 120. The top rotor casing 112 comprises of a plurality of blades 122 on a casing face 124 to channel air inside the top rotor casing 112 during the operation of the motor 100. 20
The motor 100 is an improved design with ease of assembly and disassembly. The motor 100 as disclosed in the present disclosure is advantageous in terms of providing segmented design for easy replacement of the components of the motor 100. Furthermore, the motor 100 as disclosed in the present disclosure is easy to assemble and disassemble. The disclosed motor 100 enables assembly and 25 disassembly of the elements of the rotor assembly 110. The motor 100 may be beneficially utilized for wider power output applications. Furthermore, the stator assembly 104 is obtained from the assembly of a number of individual stator tooth 108 over the stator core 106 that enables quicker assembly and disassembly of the
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stator assembly 104 enabling changing of the tooth 108 and core 106 independently as per the application requirement. Furthermore, the motor 100 is equipped with design features to mitigate the heating issues arising within the motor due to increased power output. Beneficially, the motor 100 possesses enhanced service life. 5
In an embodiment, the motor 100 comprises at least one bearing 126 mounted on the stationary motor shaft 102, wherein the top rotor casing 112 is mounted on the at least one bearing 126. It is to be understood that the top rotor casing 112 is equipped on the outer circumference of the bearing 126 for facilitating the rotation of the top rotor casing 112 during the operation of the motor 100. Beneficially, the 10 bearing 126 enables smooth rotation of the top rotor casing 112 with minimum friction during relative motion.
In an embodiment, the stator core 106 comprises a plurality of locking notches 128 and each of the plurality of stator teeth 108 comprises a locking protrusion 130, wherein the locking protrusion 130 of each of the plurality of stator teeth 108 locks 15 in the locking notches 128 of the stator core 106 to form the stator assembly 104. Beneficially, the locking protrusion 130 of each of the plurality of stator teeth 108 removably fits in the locking notches 128 of the stator core 106, such that the plurality of stator teeth 108 may be removed from the stator core 106 for replacement, based on the requirement or for maintenance purpose. Furthermore, 20 the combination of plurality of locking notches 128 and the plurality of stator teeth 108 enables easier assembly and disassembly of the stator assembly 104. It is to be understood that the locking protrusion 130 may slide fit or snugly fit into the locking notches 128.
In an embodiment, the magnetic ring 116 comprises an inner surface 116a and an 25 outer surface 116b. In a specific embodiment, the plurality of magnets 118 are fixed on the inner surface 116a of the magnetic ring 116. Beneficially, the plurality of magnets 118 are removably fixed on the inner surface 116a of the magnetic ring 116, such that the plurality of magnets 118 may be replaced, based on the
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requirement or for maintenance purposes. Beneficially, the plurality of magnets 118 may be replaced with higher grade magnets to achieve higher power output from the motor 100. Furthermore, in an embodiment, the magnetic ring 116 may be replaced with higher grade material to support the increased power output achieved by utilizing higher grade magnets. It is to be understood that in an alternative 5 embodiment, the plurality of magnets 118 are fixed on the outer surface 116b of the magnetic ring 116.
In a specific embodiment, the ring of variable permeability material 120 is fixed on the outer surface 116b of the magnetic ring 116. Beneficially, the ring of variable permeability material 120 is removably fixed on the outer surface 116b of the 10 magnetic ring 116, such that the ring of variable permeability material 120 may be replaced, based on the requirement or for maintenance purposes. Beneficially, the ring of variable permeability material 120 may be replaced with higher grade material to achieve higher power output from the motor 100. It is to be understood that in an alternative embodiment, the ring of variable permeability material 120 is 15 fixed on the inner surface 116a of the magnetic ring 116.
In an embodiment, the top rotor casing 112 comprises a plurality of fins 132 on a casing wall 134. It is to be understood that plurality of fins 132 in the form of extended surfaces are provided for accomplishing a faster rate of cooling of the motor 100 through increase of turbulence in ambient air and increase in the surface 20 area of the casing wall 134.
In an embodiment, the top rotor casing 112 comprises a plurality of air inlets 136a for entry of air inside the top rotor casing 112 during the operation of the motor 100. It is to be understood that the plurality of air inlets 136a allows the entry of air channelized by the plurality of blades 122 inside the top rotor casing 112 during the 25 operation of the motor 100. Beneficially, the air inlets 136a allow the ambient air to flow inside the top rotor casing 112 for cooling of the motor 100. Beneficially, the combination of the plurality of blades 122 and the plurality of air inlets 136a is
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designed such that a rate of flow of air inside the top rotor casing 112 increases with an increase in speed of the motor to enable efficient cooling at higher speeds.
In an embodiment, the bottom rotor casing 114 comprises a plurality of air outlets 136b for exit of air entered from the top rotor casing 112 during the operation of the motor 100. Beneficially, the plurality of air outlets 136b complements the 5 plurality of air inlets 136a for efficient cooling of the motor 100.
In an embodiment, the plurality of air inlets 136a and the plurality of air outlets 136b comprises air filters 138a, 138b. Beneficially, the air filters 138a, 138b blocks any dust, dirt or foreign particle from entering into the motor 100 through air inlets 136a and air outlets 136b. 10
In an embodiment, the magnet ring 116 is mounted in the bottom rotor casing 114 and the bottom rotor casing 114 locks inside the top rotor casing 112 to form the rotor assembly 110. It is to be understood that the locking of the bottom rotor casing 114 into the top rotor casing 112 complements segmented rotor assembly 110 and encloses the motor 100. Beneficially, the top rotor casing 112 complemented with 15 the bottom rotor casing 114 functions as enclosed casing of the motor 100.
Figure 2a, in accordance with an embodiment, describes perspective view of the top rotor casing 112. The top rotor casing 112 comprises a plurality of blades 122 on the casing face 124 to channel air inside the top rotor casing 112 during the operation of the motor 100. The top rotor casing 112 comprises the plurality of fins 20 132 on a casing wall 134. The top rotor casing 112 comprises the plurality of air inlets 136a for entry of air inside the top rotor casing 112 during the operation of the motor 100.
Figure 2b, in accordance with an embodiment, describes a section of casing face 124. A plurality of blades 122 on a casing face 124 channels the air inside the top 25 rotor casing 112 during the operation of the motor 100. The blades 122 rotates along with the top rotor casing 112 to channelize the ambient air in the inner portion of
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the motor 100. The top rotor casing 112 comprises a plurality of air inlets 136a for entry of air inside the top rotor casing 112 during the operation of the motor 100.
Figure 2c, in accordance with an embodiment, describes a section of the casing wall 134. A plurality of fins 132 are provided on a casing wall 134. The plurality of fins 132 enables the enhanced rate of cooling of the motor 100 by increasing the 5 surface area the casing wall 134.
Figure 3a, in accordance with an embodiment, describes an exploded view of the rotor assembly 110. The rotor assembly 110 comprises of the top rotor casing 112, the bottom rotor casing 114, and the magnetic ring 116. The magnetic ring 116 comprises of the plurality of magnets 118 and the ring of variable permeability 10 material 120. The magnetic ring 116 comprises the inner surface 116a and the outer surface 116b and is mounted in the bottom rotor casing 114. The plurality of magnets 118 are fixed on the inner surface 116a. The ring of variable permeability material 120 is fixed on the outer surface 116b. The bottom rotor casing 114 comprises the plurality of air outlets 136b for exit of air entered from the top rotor 15 casing 112 during the operation of the motor 100. The plurality of air inlets 136a and the plurality of air outlets 136b comprises the air filters 138a, 138b. The bottom rotor casing 114 locks inside the top rotor casing 112 to form the rotor assembly 110.
Figure 3b, in accordance with an embodiment, describes a cross-sectional view of 20 the rotor assembly 110. The rotor assembly 110 comprises of the top rotor casing 112, a bottom rotor casing 114, and a magnetic ring 116. The top rotor casing 112 comprises a plurality of blades 122 on a casing face 124 and a plurality of fins 132 on a casing wall 134. The bottom rotor casing 114 locks inside the top rotor casing 112 to form the rotor assembly 110. 25
Figure 4a, in accordance with an embodiment, describes a stator assembly 104. The stator assembly 104 comprising the stator core 106 and the plurality of stator teeth 108, is mounted on the stationary motor shaft 102. The stator core 106 comprises of a plurality of locking notches 128. Each of the plurality of stator teeth
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108 comprises of the locking protrusion 130. The locking protrusion 130 locks in the locking notches 128 to form the stator assembly 104.
Figure 4b, in accordance with an embodiment, describes a stator tooth 108. Each of the plurality of stator teeth 108 comprises a locking protrusion 130 to lock in the locking notches. the plurality of stator teeth 108 accommodates a plurality of flux 5 coils.
In an embodiment, segmented electric motor 100 comprises a stationary motor shaft 102, a stator assembly 104 and a rotor assembly 110. The stator assembly 104 comprises of a stator core 106 and a plurality of stator teeth 108. The stator assembly 104 is mounted on the stationary motor shaft 102. The rotor assembly 110 10 comprises of a top rotor casing 112, a bottom rotor casing 114, and a magnetic ring 116. The magnetic ring 116 comprises of a plurality of magnets 118 and a ring of variable permeability material 120. The top rotor casing 112 comprises of a plurality of blades 122 on a casing face 124 to channel air inside the top rotor casing 112 during the operation of the motor 100. Furthermore, the motor 100 comprises 15 at least one bearing 126 mounted on the stationary motor shaft 102, wherein the top rotor casing 112 is mounted on the at least one bearing 126. Furthermore, the stator core 106 comprises a plurality of locking notches 128 and each of the plurality of stator teeth 108 comprises a locking protrusion 130, wherein the locking protrusion 130 of each of the plurality of stator teeth 108 locks in the locking notches 128 of 20 the stator core 106 to form the stator assembly 104. Furthermore, the magnetic ring 116 comprises an inner surface 116a and an outer surface 116b. Furthermore, the plurality of magnets 118 are fixed on the inner surface 116a of the magnetic ring 116. Furthermore, the ring of variable permeability material 120 is fixed on the outer surface 116b of the magnetic ring 116. Furthermore, the top rotor casing 112 25 comprises a plurality of fins 132 on a casing wall 134. Furthermore, the top rotor casing 112 comprises a plurality of air inlets 136a for entry of air inside the top rotor casing 112 during the operation of the motor 100. Furthermore, the bottom rotor casing 114 comprises a plurality of air outlets 136b for exit of air entered from the top rotor casing 112 during the operation of the motor 100. Furthermore, the 30
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plurality of air inlets 136a and the plurality of air outlets 136b comprises air filters 138a, 138b. Furthermore, the magnet ring 116 is mounted in the bottom rotor casing 114 and the bottom rotor casing 114 locks inside the top rotor casing 112 to form the rotor assembly 110.
In the description of the present invention, it is also to be noted that, unless 5 otherwise explicitly specified or limited, the terms “disposed,” “mounted,” and “connected” are to be construed broadly, and may for example be fixedly connected, detachably connected, or integrally connected, either mechanically or electrically. They may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning 10 of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Modifications to embodiments and combinations of different embodiments of the present disclosure described in the foregoing are possible without departing from the scope of the present disclosure as defined by the accompanying claims. 15 Expressions such as “including”, “comprising”, “incorporating”, “have”, and “is” used to describe and claim the present disclosure are intended to be construed in a non-exclusive manner, namely allowing for items, components or elements not explicitly described also to be present. Reference to the singular is also to be construed to relate to the plural where appropriate. 20
Although embodiments have been described with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or 25 arrangements of the subject combination arrangement within the scope of the present disclosure, the drawings, and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art. ,CLAIMS:We Claim:
1. A segmented electric motor (100), the motor (100) comprising:
- a stationary motor shaft (102);
- a stator assembly (104) comprising a stator core (106) and a plurality of stator teeth (108), wherein the stator assembly (104) is mounted on the 5 stationary motor shaft (102); and
- a rotor assembly (110) comprising a top rotor casing (112), a bottom rotor casing (114), and a magnetic ring (116), wherein the magnetic ring (116) comprises a plurality of magnets (118) and a ring of variable permeability material (120), 10
wherein the top rotor casing (112) comprises a plurality of blades (122) on a casing face (124) to channel air inside the top rotor casing (112) during the operation of the motor (100).
2. The motor (100) as claimed in claim 1, wherein the motor (100) comprises at least one bearing (126) mounted on the stationary motor shaft (102), wherein the 15 top rotor casing (112) is mounted on the at least one bearing (126).
3. The motor (100) as claimed in claim 1, wherein
- the stator core (106) comprises a plurality of locking notches (128),
- each of the plurality of stator teeth (108) comprises a locking protrusion (130), 20
and wherein the locking protrusion (130) of each of the plurality of stator teeth (108) locks in the locking notches (128) of the stator core (106) to form the stator assembly (104).
4. The motor (100) as claimed in claim 1, wherein the magnetic ring (116) comprises an inner surface (116a) and an outer surface (116b). 25
5. The motor (100) as claimed in claim 4, wherein the plurality of magnets (118) are fixed on the inner surface (116a) of the magnetic ring (116).
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6. The motor (100) as claimed in claim 4, wherein the ring of variable permeability material (120) is fixed on the outer surface (116b) of the magnetic ring (116).
7. The motor (100) as claimed in claim 1, wherein the top rotor casing (112) comprises a plurality of fins (132) on a casing wall (134). 5
8. The motor (100) as claimed in claim 1, wherein the top rotor casing (112) comprises a plurality of air inlets (136a) for entry of air inside the top rotor casing (112) during the operation of the motor (100).
9. The motor (100) as claimed in claim 1, wherein the bottom rotor casing (114) comprises a plurality of air outlets (136b) for exit of air entered from the top 10 rotor casing (112) during the operation of the motor (100).
10. The motor (100) as claimed in any of the claims 8 and 9, wherein the plurality of air inlets (136a) and the plurality of air outlets (136b) comprises air filters (138a, 138b).
11. The motor (100) as claimed in claim 1, wherein the magnet ring (116) is 15 mounted in the bottom rotor casing (114), and wherein the bottom rotor casing (114) locks inside the top rotor casing (112) to form the rotor assembly (110).