Description:Field of the Invention

The present invention generally relates to a circulator motor used in fluid-handling applications. More particularly, the present invention relates to an improved circulator motor with improved torque and effective isolation of wet and dry sides of the motor for efficient thermal regulation and fluid distribution.

Background of the Invention

Circulator motors are critical components in closed-loop systems which are commonly used to transport fluids through boilers, cooling towers, and heat exchangers. Circulator motors are extensively utilized in residential Heating, Ventilation, and Air Conditioning (HVAC) systems, as well as in various industrial fluid-handling applications. Despite their widespread use, traditional circulator motors encounter several significant challenges. One major issue is excessive noise which is disruptive in both residential and commercial environments. Additionally, traditional pumps often have complex sealing requirements for liquids such as mechanical seals around rotating shafts, which introduces potential failure points.

Typically, circulator motors utilize induction motors to ensure consistent flow within HVAC systems. However, induction motors operate at a fixed speed dictated by power supply frequency, and any deviation in speed results in fluctuations in system efficiency. In these systems, the motor's rotor is submerged in a liquid medium and mechanically linked to an impeller. A static metallic joint separates the stator from the rotor, creating distinct wet and dry sides for the rotor and stator. In such systems, magnetic flux produced by the stator's excitation coils induces eddy currents in the static metallic joint, resulting in iron losses.

Generally, in circulator motors, the motor's rotor is immersed in the fluid while the stator is sealed to prevent fluid ingress. However, circulator motors face issues related to noise, mechanical wear, and challenges in achieving a leak-proof system. Mechanical wear is a significant concern as continuous or near-continuous operation of the motors leads to substantial wear and tear on mechanical components, necessitating frequent maintenance. Traditional pumps also struggle with inefficiencies often failing to control flow rates to targeted values effectively, leading to energy wastage. Many traditional pumps lack capability to adjust flow rates dynamically, which is crucial for optimizing system performance.

Also, conventional wet rotor circulators are known to face several challenges, particularly related to contamination and corrosion. For example, system fluids often carry contaminants such as lime and other minerals. These contaminants tend to deposit on the rotor shaft and rotor bearing races, leading to mechanical wear and potential failure. Additionally, conventional designs lack effective noise dampening mechanisms, resulting in increased operational noise. This is especially undesirable in residential and commercial settings. Another significant challenge is the complexity involved in achieving a reliable seal between the wet and dry sides of the motor. Conventional designs frequently rely on mechanical seals, which are prone to leakage and require frequent maintenance. The need for a robust sealing mechanism is particularly critical in applications where the circulating fluid is corrosive or contains abrasive particles.

In light of the aforementioned drawbacks, there is a need for an improved circulator motor for effective isolation of wet and dry sides of the motor for efficient thermal regulation and fluid distribution. There is a need for an improved circulator motor that offers a cost-effective solution eliminating necessity for complex mechanical seals. Also, there is a need for a circulator motor that includes a reliable and efficient sealing mechanism to prevent eddy current losses.

Summary of the Invention

A split construction-based improved circulator motor (100) for fluid-handling applications is provided. The improved circulator motor (100) comprises a wet chamber in contact with a fluid medium, which comprises a rotor (118) with multiple radial rotor laminations (144). The wet chamber comprises an impeller (124) mechanically coupled to the rotor for pumping fluid through a pump body (102) and a first section of an axial stator (120a) with multiple axial stator laminations (138). The wet chamber comprises a sensor (148) positioned within the wet chamber to detect the position and speed of the rotor, and a double groove ball bearing (150). The improved circulator motor (100) comprises a dry chamber, located outside the fluid medium that comprises a second section of the axial stator (120b) with multiple axial stator laminations (138). The dry chamber comprises a radial stator (122) with multiple radial stator laminations (140), excitation windings (132) wound around the poles of the axial stator laminations (138), and a control unit (110) configured to monitor the rotor's position and adjust the motor's speed and power. The improved circulator motor (100) comprises a static barrier (128) made from corrosion-resistant material that separates the wet and dry chambers to prevent fluid ingress into the dry chamber. The static barrier (128) is enhanced with O-rings (136) for better sealing capabilities and is manufactured using an injection moulding technique to prevent fluid ingress into the dry chamber.

Brief Description of the Drawings

FIG. 1a illustrates an improved circulator pump motor integrated into a pump body, in accordance with an embodiment of the present invention;

FIG. 1b illustrates construction of the circulator pump motor, in accordance with an embodiment of the present invention;

FIG. 1c-1e illustrate one or more O rings or static seals, in accordance with an embodiment of the present invention;

FIG. 1f illustrates a sectional view of the improved circulator pump motor, in accordance with an embodiment of the present invention;

FIG. 1g illustrates split construction of the improved circulator pump motor, in accordance with an embodiment of the present invention;

FIG. 1h depicts sectional view of the pump body and the improved circulator pump motor, in accordance with an embodiment of the present invention;
FIG. 1i illustrates an integrated impeller and over-moulded rotor with partially over-moulded rotor laminations having exposed tips, in accordance with an embodiment of the present invention;

FIG. 2. illustrates an additional cover of the improved circulator pump motor, in accordance with an embodiment of the present invention;

FIG. 2a illustrates an additional O ring that prevents fluid medium from entering into a dry chamber; and

FIG. 3 is a depiction of internal components of the improved circulator pump motor without the static barrier, in accordance with an embodiment of the present invention.

Detailed Description of the Invention

The disclosure is provided in order to enable a person having ordinary skill in the art to practice the invention. Exemplary embodiments herein are provided only for illustrative purposes and various modifications will be readily apparent to persons skilled in the art. The general principles defined herein may be applied to other embodiments and applications without departing from the scope of the invention. The terminology and phraseology used herein is for the purpose of describing exemplary embodiments and should not be considered limiting. Thus, the present invention is to be accorded the widest scope encompassing numerous alternatives, modifications and equivalents consistent with the principles and features disclosed herein. For purposes of clarity, details relating to technical material that is known in the technical fields related to the invention have been briefly described or omitted so as not to unnecessarily obscure the present invention.

The present invention would now be discussed in context of embodiments as illustrated in the accompanying drawings.

FIG. 1a illustrates an improved circulator pump motor 100 integrated into a pump body 102, in accordance with an embodiment of the present invention. As shown in FIG. 1a, fluid enters through an inlet 106 and exits via an outlet 108 of the pump body 102. Multiple fasteners 104 secure the improved circulator pump motor 100 to the pump body 102. FIG. 1b illustrates the improved circulator pump motor 100, which comprises a control unit 110, rotor 118, a stator comprising an axial stator 120 and a radial stator 122, an impeller 124, a screw nut 126, an over-moulded static barrier 128, a bobbin 130, copper excitation windings 132 and a chamfer 134. In an embodiment of the present invention, the rotor 118 is constructed using multiple radial rotor laminations 144 (FIG.1f) the axial stator 120 is constructed using multiple axial stator laminations 138 (FIG.1f), and the radial stator 122 is constructed using multiple radial stator laminations 140 (FIG.1f), as illustrated in FIG. 1b. In various embodiments of the present invention, the improved circulator pump motor 100 is a switched reluctance motor or a brushless DC motor. In an embodiment of the present invention, the rotor 118 is an over-moulded cylindrical rotor which minimizes sharp contours of the radial rotor laminations 144 with the fluid medium, thereby reducing turbulence in the circulating fluid medium.

In an embodiment of the present invention, the improved circulator pump motor 100 features a split motor construction with distinct wet and dry chambers. FIG. 1g illustrates the split construction of the improved circulator pump motor 100 depicting the separation of components of the improved circulator pump motor 100 between the dry chamber and the wet chamber of the motor 100. The wet chamber, which interfaces with the fluid medium, includes the rotor 118, a first section of the axial stator 120a, the impeller 124, the screw nut 126 and a double groove ball bearing (150, FIG. 1f). The dry chamber, isolated from the fluid medium by the static barrier 128, comprises the excitation windings 132, a second section of the axial stator 120b, the radial stator 122, and the control unit 110. The static barrier 128 is constructed as a single part from corrosion-resistant material, which effectively separates the wet and dry chambers. In an exemplary embodiment, the static barrier 128 is manufactured using injection moulding or over-moulding techniques to prevent fluid ingress into the dry chamber. FIG. 1h presents a sectional view of the pump body 102, which houses the improved circulator pump motor 100 using the fasteners 104 (as shown in FIG.1a) and the chamfer 134, where the chamfer 134 is a static seal.

In another embodiment of the present invention, one or more O-rings (136, FIG. 1c-1e) are used as supplementary static seals within the static barrier 128 to further prevent fluid ingress into the dry chamber. FIG. 1c illustrates a single O-ring 136 positioned on a flange face of the static barrier 128. FIG. 1d illustrates the single O-ring 136 positioned on the flange circumference of the static barrier 128. FIG. 1e depicts two O-rings 136 positioned on both the flange circumference and the flange face of the static barrier 128. In an exemplary embodiment of the present invention, the O-ring 136, is constructed from nitrile rubber. In one embodiment of the present invention, the O-ring may function as either an external pressure seal or an internal pressure seal. The over-moulded static barrier 128 offers several advantages, including, but are not limited to, improving assembly and fitting process of the circulator pump motor 100 into the pump body 102, ensuring that the axial stator laminations remain securely in place, and allowing the circulator pump motor 100 to be mounted to the pump body 102 using multiple fasteners 104. In an embodiment of the present invention, the multiple fasteners 104 may be utilized to directly mount a motor housing cover to the pump body 102. The integration of the O-ring 136 into the static barrier 128 not only enhances sealing capabilities but also contributes to overall durability and reliability of the circulator pump motor 100. By utilizing nitrile rubber, known for its excellent resistance to oil, fuel, and other chemicals, the O-ring 136 ensures a robust seal that may withstand various operational conditions and fluid mediums. The nitrile rubber O-ring 136 also provides flexibility and resilience, which are critical for maintaining integrity of the seal over prolonged periods of use. Consequently, the nitrile rubber O-ring 136 plays a pivotal role in efficient and long-lasting performance of the circulator pump motor 100.

FIG. 1f illustrates a sectional view of the improved circulator motor 100, depicting the double groove ball bearing 150 control unit 110, bobbin 130, copper excitation windings 132, axial stator laminations 138 in the first and second axial stators 120a, 120b (as shown in FIG. 1g), and radial stator laminations 140, magnetic flux path 142, radial rotor laminations 144, a shaft 146, a sensor Printed Circuit Board (PCB) 148 in the wet chamber, and a sensor target 156 in the wet chamber. In an embodiment of the present invention, the radial stator laminations 140 and the axial stator laminations 138 are interconnected resulting in closing of the flux path 142 along radial planes of the radial stator laminations 140 and axial planes of the axial stator laminations 138, thereby optimizing generated torque in the circulator pump motor 100. In an embodiment of the present invention, the radial stator laminations 140 are constructed to fit within diametrically opposite axial stator laminations 138. The radial stator laminations 140 are axially aligned with the axial stator laminations 138 to magnetically connect one or more diametrically opposite axial stator poles ensuring that the excitation windings 132 remain in the dry chamber, thereby facilitating improved assembly, manufacturing, and maintenance. By positioning the excitation winding 132 axially along the axial stator laminations 138 rather than radially, the circulator pump motor 100 becomes more compact in size.

In an embodiment of the present invention, the rotor 118 may be mechanically coupled to the impeller 124 to form two entities. In another embodiment of the present invention, the rotor 118 may be integrated with the impeller 124 to form a single entity as illustrated in FIG. 1i. FIG. 1i illustrates an integrated impeller 124 and over-moulded rotor 118b with partially over-moulded rotor laminations 118a having exposed tips. In an exemplary embodiment of the present invention, the rotor 118 is constructed using electrical-grade steel laminations. The over-moulded static barrier 128 extends from top of the rotor 118 to below the bobbin 130. The chamfer 134 is constructed on a front edge of the over-moulded static barrier 128 to increase surface area of contact between the over-moulded static barrier 128 and the pump body 102 during assembly of the circulator pump motor 100 within the pump body 102. The chamfer creates a static seal which prevents fluid ingress to the dry chamber.

In an embodiment of the present invention, the rotor 118 is immersed in the fluid medium on the wet chamber and is connected to the impeller 124 via the shaft 146. The impeller 124 pumps the fluid medium through the pump body 102 when the rotor 118 rotates. The first section of the axial stator 120a of the improved circulator motor 100 is immersed in the fluid medium in the wet chamber, while the second section of the axial stator 120b is in the dry chamber and isolated from the fluid medium by the static barrier 128. In an exemplary embodiment of the present invention, the rotor 118 and stator 120 may be constructed from silicon steel or other suitable magnetic materials. The excitation windings 132 in the dry chamber are wound around a plurality of poles of the axial stator laminations 138 in the second section of axial stator 120b. The flux path 142 is established, comprising a radial flux component flowing through the radial stator laminations 140 and radial rotor laminations 144 and an axial flux component flowing through the axial stator laminations 138. The flux path 142 is optimized to minimize flux leakage and eddy current losses, thereby maximizing generated torque and efficiency of the circulator motor 100. In an embodiment of the present invention, the flux path 142 is influenced by shape, size, material, and arrangement of the stator 120, rotor 118, static barrier 128, and excitation windings 132.

In a typical SRM, winding wound around the bobbin are inserted radially on a stator pole. However, in the improved circulator motor 100, the windings wound around the bobbin 130 are inserted or placed parallel to the axis of the circulator motor 100 during assembly of the circulator pump motor 100 such that a flux component is parallel to the axis of the circulator motor 100 along the axial stator laminations 138. The excitation windings 132 are constructed using high-quality motor-grade copper or aluminium and are securely positioned on axial stator laminations 138 or in the dry chamber thereby ensuring the excitation windings 132 remain dry and protected from environmental factors. The flux path 142 traverses the fluid medium to generate torque, with the flux path 142 being three-dimensional. In another embodiment of the present invention, the circulator pump motor 100 comprises a stator connector that links the flux path 142 for two diametrically opposite axial stator laminations 138. The excitation windings 132 are directly connected to the control unit 110, with the windings 132 arrayed radially and aligned axially. Both the excitation windings 132 and the control unit 110 are configured to generate and control the flux path 142 that drives the rotor 118 of the motor 100. The control unit 110 also interfaces with the sensor PCB 148, which is an inductive sensor such as an inductive position encoder, to detect position and speed of the rotor 118, thereby coordinating commutation of the motor 100.

In an embodiment of the present invention, the impeller 124 is affixed to one end of the shaft 146 and is designed to pump the fluid medium through the pump body 102. The impeller 124 may be constructed from metal, plastic, or other suitable materials. The shaft 146 is a hardened metal rod that connects the impeller 124 to the rotor 120, thereby ensuring mechanical stability and efficient power transmission. The shaft 146 or rotor 118 may also incorporate the sensor target 156, which is coupled to the sensor. The sensor is located in the wet chamber and is configured to detect the position and speed of the rotor 118, thereby coordinating the commutation of the circulator pump motor 100.

The stator comprising the axial stator 120 and the radial stator 122 is constructed using precisely stacked and interconnected laminations in both horizontal and vertical planes. This improved construction allows the circulator pump motor 100 to maintain distinct dry and wet chambers, eliminating need for magnetic coupling between the rotor 118 and the impeller 124. In another embodiment of the present invention, the screw nut 126 supports the shaft 146 at the static barrier 128. The screw nut 126 is located in the fluid medium on the wet chamber, where it is both lubricated and cooled by the fluid medium, enabling it to handle extended duty cycles with minimal friction. During operation, the fluid medium enters the pump body 102, contacts the impeller 124, and is then forced through the outlet 108 at a required pressure and flow rate. The fluid medium interacts with the impeller 124, rotor 118, first section of the axial stator 120a, screw nut 126, and the shaft 146.

In an embodiment of the present invention, the control unit 110 comprises a software unit that is configured to monitor the rotor 118 position and a value of current drawn, thereby adjusting speed and power of the circulator pump motor 100. In the event of a jam or high torque scenario (often due to sediment or scale buildup), a fault condition is triggered in the circulator pump motor 100. The control unit 110 then rapidly executes short bursts of forward and reverse rotation of the rotor 118. This action agitates the fluid medium around the impeller 124, helping to dislodge sediment or debris. Once the jammed material is freed, normal operation of the circulator pump motor 100 automatically resumes, thereby preventing the need for manual disassembly. In an exemplary embodiment of the present invention, the control unit 110 comprises a microcontroller, a power driver, a sensor interface, and other electronic components configured to control the operation of the circulator motor 100. The control unit 110 may include, but is not limited to, a communication interface, such as a wireless or wired connection, to receive commands or feedback from an external controller or user interface. The control unit 110 may also include a memory, a clock, a battery, and other components useful for motor control. In an embodiment of the present invention, the control unit 110 may be mounted on a separate support plate.

In another embodiment of the present invention, the static barrier 128 and the first section of the axial stator 120a may be coated to optimize resistance to corrosion, depending on fluid medium used such as glycol mixes and mildly corrosive liquids properties. Surface treatments or coatings of the motor 100 via epoxy or stainless-steel layering, protect against wear, tear, and corrosion by creating a barrier between the steel surface and environmental factors like moisture and fluids. The following are examples of coatings that may be used:

a. Paint Coatings: Epoxy-based paints or other corrosion-resistant paints designed for steel surfaces are suitable for impellers 124 used in non-aggressive environments.

b. Powder Coating: A dry powder is applied electrostatically and then cured under heat to form a tough, corrosion-resistant layer, providing better adhesion and durability than paint.

c. Galvanizing: Coating the steel impeller 124 with zinc through hot-dipping or electroplating. Zinc acts as a sacrificial layer, corroding first before steel.

d. Polymer Coatings: Use coatings like PTFE (Teflon) or other plastic-based materials for high corrosion resistance. Ideal for impeller 124 exposed to harsh chemicals or abrasive materials.

e. Ceramic Coatings: Apply ceramic-based materials for enhanced resistance to rust, wear, and high temperatures.

f. Anodizing: Effective for impeller 124 constructed using aluminium alloys but not for steel.

g. Phosphating: Applying a phosphate chemical conversion coating. Works as a primer for further coatings like paint.

h. Electroplating: Using nickel, chrome, or other corrosion-resistant metals to create a durable, rust-resistant layer.

i. Case Hardening or Surface Treatment: Techniques like nitriding or carburizing may increase surface hardness and reduce corrosion.

In an example, calculated torque value for the circulator pump motor 100 is illustrated herein below:

Parameter Value Unit
Pressure (p) (Head Height) (H) 4.12 M
Flow rate (Q) 0.37 m^3/hr
Flow rate (Q) 0.000103 m^3/sec
Power (P) = p*Q 4.12*0.37/3600000=4.23e^(-7) kW
Density (ρ) 1000 Kg/m^3
Gravity (g) 9.81 m/s^2
Output power (Hydraulic)P_Hydraulic = (p * Q * 1000 * 9.81) / (3600000 * 1000) 4.12**0.37*1000*9.81/(3600000*1000)=4.15 W
Motor Output Power P_out (Considering motor and impeller efficiency of 0.6 and volumetric efficiency of 4 and output hydraulic power) (4.15)/0.6+4=10.92 W
Motor input power P_in (Motor output power/0.6) 10.92/0.6=18.20 W
Typical maximum angular velocity in RPM 1500 RPM
Motor Torque (Ʈ) = (Motor output power/RPM*60/2/π) =10.92/1500*60/2/π=0.06 Nm

In an embodiment of the present invention, the control unit 110, excitation windings 132, and radial stator laminations 140 are enclosed by an additional cover 202 of the improved circulator motor 200, as illustrated in FIG. 2. FIG. 2a shows an additional O-ring 208 that prevents the fluid medium from entering the dry chamber. FIG. 3 is a depiction of internal components of the improved circulator pump motor 100 without the static barrier 128. FIG. 3 depicts the control unit 110, bobbin 130, copper excitation windings 132, axial stator laminations 138, radial stator laminations 140, radial rotor laminations 144, sensor PCB 148, and double groove bearing 150.

Advantageously, simplified construction of the improved circulator pump motor 100 uses fewer mechanical seal points, thereby reducing potential leakage paths. Additionally, the circulator pump motor 100 has enhanced reliability through self-lubricating bearings in the fluid and software-based jam detection, which collectively reduce downtime. The circulator pump motor 100 is versatile and may function both as a circulator and a pump due to its non-linear performance. The circulator pump motor 100 is cost-effective due to the use of simpler rotor lamination and minimal external sealing, which reduces manufacturing expenses. Furthermore, the circulator pump motor 100 boasts a compact design and operates more quietly due to the integration of the rotor and impeller 124. Moreover, the split construction of the improved circulator pump motor 100 results in a smaller footprint and reduced operating noise. The improved circulator pump motor 100 has a high-efficiency design that allows for optimized control through advanced algorithms, accommodating varying load and speed demands. Advantageously, the improved circulator pump motor 100 offers a simplified design, lower maintenance requirements, and reduced potential leak paths. Additionally, the improved circulator pump motor 100 supports a broad operational temperature range of 0°C to 100°C, making it suitable for typical HVAC and industrial fluid-handling applications.

Further, advantageously, the improved circulator pump motor 100 with the split construction controls fluid flow rates to targeted values by adjusting motor speed and power, thereby improving overall system efficiency. In various embodiments of the present invention, the improved circulator pump motor 100 may be utilized in boiler loops, radiator circuits, and chilled water loops for both residential and commercial buildings. The improved circulator pump motor 100 is also suitable for use in heat exchangers and cooling towers where reliability is paramount, as well as in potable water systems and other closed-loop distribution systems where silence and efficiency are critical. Additionally, eddy current losses are reduced in the improved circulator pump motor 100 due to absence of metallic-based seals and use of the over moulded static barrier 128. Furthermore, the improved circulator pump motor 100 provides air cooling when the fluid medium is hot. The improved circulator pump motor 100 enhances cooling of the motor when the fluid medium is cold, as the cold fluid medium comes into contact with a first section of the axial stator 120a and the over moulded static barrier 128, which in turn keeps the dry chamber of the circulator pump motor 100 cool.

While the exemplary embodiments of the present invention are described and illustrated herein, it will be appreciated that they are merely illustrative. It will be understood by those skilled in the art that various modifications in form and detail may be made therein without departing from the scope of the invention.
 
, Claims:We Claim:

A split construction based improved circulator motor (100) for fluid-handling applications, comprising:
a wet chamber in contact with a fluid medium and comprising:
a rotor (118) comprising multiple radial rotor laminations (144);
an impeller (124) mechanically coupled to the rotor (118) for pumping a fluid medium through a pump body (102);
a first section of an axial stator (120a) comprising multiple axial stator laminations (138);
a sensor (148) positioned within the wet chamber to detect a position and speed of the rotor (118); and
a double groove ball bearing (150);
a dry chamber outside the fluid medium and comprising:
a second section of the axial stator (120b) comprising multiple axial stator laminations (138);
a radial stator (122) comprising multiple radial stator laminations (140);
excitation windings (132) wound around a plurality of poles of the axial stator laminations (138) of the second section of axial stator (120 b);
a control unit (110) configured to monitor a position of the rotor (118) and adjust a speed and power of the circulator pump motor (100); and
a static barrier (128) constructed from a corrosion-resistant material separating the wet chamber from the dry chamber to prevent fluid ingress into the dry chamber, wherein one or more O-rings (136) are positioned on the static barrier (128) to enhance sealing capabilities and prevent fluid ingress into the dry chamber, and wherein the static barrier (128) is manufactured using injection moulding technique to prevent fluid ingress into the dry chamber.

The improved circulator motor of claim 1, wherein the rotor (118) is an over-moulded cylindrical rotor to minimize sharp contours with the fluid medium, thereby reducing turbulence in the circulating fluid.

The improved circulator motor of claim 1, wherein the static barrier (128) and the first section of the axial stator (120a) are coated to optimize resistance to corrosion.

The improved circulator motor of claim 1, wherein the control unit (110) is configured to execute short bursts of forward and reverse rotation of the rotor (118) in an event of a jam or high torque scenario to dislodge sediment or debris from the fluid medium.

The improved circulator motor of claim 1, wherein the static barrier (128) is an over-moulded static barrier (128) which includes a chamfered front edge to increase a surface area of contact between the static barrier (128) and the pump body (102), thereby creating a static seal to prevent fluid ingress into the dry chamber.

The improved circulator motor of claim 1, wherein the sensor (148) is an inductive position encoder configured to detect the position and speed of the rotor (118).

The improved circulator motor of claim 1, wherein the circulator pump motor 100 comprises multiple fasteners (104) that secure the improved circulator pump motor 100 to the pump body (102).

The improved circulator motor as claimed in claim 1, wherein the O-rings (136) function either as an external pressure seal or internal pressure seal.

The improved circulator motor as claimed in claim 7, wherein the static barrier (128) allows the circulator pump motor (100) to be mounted on the pump body (102) using the multiple fasteners (104), thereby simplifying assembly and fitting process of the circulator pump motor (100) into the pump body (102) and ensuring that the axial stator laminations (138) remain securely in place.

The improved circulator motor as claimed in claim 1, wherein the radial stator laminations 140 and the axial stator laminations 138 are interconnected resulting in closing of the flux path 142 along radial planes of the radial stator laminations 140 and axial planes of the axial stator laminations 138.

The improved circulator motor as claimed in claim 1, wherein the radial stator laminations (140) are constructed to fit within the axial stator laminations (138), and wherein the radial stator laminations (140) are axially aligned with the axial stator laminations (138) to magnetically connect one or more diametrically opposite poles of the axial stator laminations (138) ensuring that the excitation winding (132) remain in the dry chamber, thereby facilitating easier assembly, manufacturing, and maintenance.

The improved circulator motor as claimed in claim 1, wherein the static barrier (128) has a chamfer (134) constructed on a front edge of the over-moulded static barrier (128) to increase surface area of contact between the over-moulded static barrier (128) and the pump body (102) during assembly of the circulator pump motor (100) within the pump body (102), wherein the chamfer (134) creates a static seal which prevents fluid ingress to the dry chamber.

The improved circulator motor (100) as claimed in claim 1, wherein the excitation windings (132) are wound around a bobbin (130) and are inserted parallel to an axis of the circulator pump motor (100) such that a flux path component is established parallel to the axis of the circulator motor (100) along the axial stator laminations 138, wherein the flux path (142) comprises a radial flux component flowing through the radial stator laminations (140) and the radial rotor laminations (144) and an axial flux component flowing through the axial stator laminations (138).

Dated this 7th day of April, 2025

Aditya Avartan Technologies Private Limited

(Jogeshwar Mishra)
IN/PA-2578
of Shardul Amarchand Mangaldas & Co.
Attorneys for the Applicant