Outer rotor motor assembly for industrial applications

Abstract

An outer rotor motor assembly for industrial applications is provided. The outer rotor motor assembly includes: a stator including a stator core defining a cavity; and a rotor including a wall and one or more magnets aligned along the wall. The wall is positioned outside the stator. The rotor also includes a first cover coupled with the wall and one or more fins positioned on the first cover, wherein the one or more fins are received in the cavity.

Description

Technical Field

[0001] The field of the present disclosure relates generally to electric motors and, more particularly, to outer rotor electric motor assemblies for industrial applications. Background Art

[0002] During operation of an electric motor, the primary source of heat comes from the current flowing through the stator windings in the motor. In an outer rotor motor, the stator is located inside the rotor. The heat generated by the stator is primarily confined inside the motor, leading to winding failures and thermally limited output power. Due to the heat dissipation issues, outer rotor motors are not typically used in industrial applications where the motor needs to operate continuously for relatively long periods of time, such as months or even years. Therefore, known assemblies and methods are disadvantaged in some respects in meeting the needs of industrial applications and improvements are needed. Summary of the invention

[0003] In one aspect, an outer rotor motor assembly for industrial applications is provided. The outer rotor motor assembly includes: a stator including a stator core defining a cavity; and a rotor including a wall and one or more magnets aligned along the wall. The wall is positioned outside the stator. The rotor also includes a first cover coupled to the wall and one or more fins positioned on the first cover, wherein the one or more fins are received in the cavity.

[0004] In another aspect, a method of assembling an outer rotor motor assembly for industrial applications is provided. The method includes forming a stator including a stator core, the stator core defining a cavity. The method also includes forming a rotor including a wall and one or more magnets aligned along the wall. The rotor also includes a first cover and one or more fins positioned on the first cover. The method also includes positioning the wall outside the stator and positioning the first cover so that the one or more fins are received in the cavity.

[0005] In yet another aspect, a fin assembly for industrial applications is provided. The fin assembly includes an outer rotor motor assembly and one or more blades coupled to the outer rotor motor assembly. The outer rotor motor assembly includes: a stator including a stator core defining a cavity; and a rotor including a wall and one or more magnets aligned along the wall. The wall is positioned outside the stator. The rotor also includes a first cover coupled to the wall and one or more fins positioned on the first cover, wherein the one or more fins are received in the cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] These and other features, aspects and advantages of the present disclosure will become better understood when the following detailed description is read with reference to the accompanying drawings, wherein like characters refer to like parts throughout.

[0007] Figure 1A is a perspective view of an example motor assembly.

[0008] Figure 1B yes Figure 1A A perspective view of the motor assembly is shown with the second cover removed.

[0009] Figure 1C yes Figure 1A The motor assembly is shown along Figure 1A A cross-sectional view taken along the section line 1C-1C marked in FIG.

[0010] Figure 2 is an exploded view of another example motor assembly.

[0011] Figure 3 is a cross-sectional view of yet another example motor assembly.

[0012] Figure 4A is a perspective view of an example fin assembly with the motor assembly shown in FIGS. 1 to 3 installed.

[0013] Figure 4B Air flow for a fin assembly based on computer simulation data is shown.

[0014] Figure 5 Yes Assembly Figures 1A to 3 A flow chart of an example method of an electric machine assembly is shown.

[0015] Figure 6 is a block diagram of an example user computer device.

[0016] Figure 7 is a block diagram of an example server computer device. DETAILED DESCRIPTION

[0017] The present disclosure includes an outer rotor motor assembly for industrial applications. As used herein, an outer rotor motor assembly refers to an outer rotor electric motor assembly. In the art, an outer rotor motor may also be referred to as an outer rotor motor or an outrunner motor. A direct drive outer rotor motor assembly is described herein as an example for illustration purposes only, wherein the motor directly drives a mechanical load. The assemblies and methods described herein may generally be used for outer rotor motor assemblies, wherein the rotor is positioned outside of the stator in the motor assembly. Method aspects will be partially apparent in the following description and partially explicitly discussed.

[0018] Figures 1A to 1C An example outer rotor motor assembly 100 is shown. Figure 1A is a perspective view of the motor assembly 100 . Figure 1B is a perspective view of the motor assembly 100 with the second cover 102 removed. Figure 1C The motor assembly 100 is along Figure 1A1C-1C. In the exemplary embodiment, the motor assembly 100 includes a stator 104 and a rotor 106. The rotor 106 has a rotational freedom relative to the stator 104, which is achieved by the bearing set 201 and the shaft 203 (these components are not shown in FIG. Figures 1A to 1C shown in Figure 2 1 ). The stator 104 includes a stator core 108 and windings 110. The stator 104 may be formed as an annular structure. The stator 104 defines a cavity 112 through the stator 104 and forms a perimeter or boundary of the cavity 112. Structures or components (e.g., electronic components of the motor) may be housed in the cavity 112. The stator core 108 includes a core 114 and a plurality of fingers 116 extending from the core 114. The windings 110 are wound around the fingers 116. When the motor assembly 100 is in operation, current flows through the windings 110.

[0019] In an exemplary embodiment, the rotor 106 includes a rotor can 122. The rotor can 122 includes an end cap 124 and a wall 126 extending from the end cap 124 at an angle to the end cap 124. The end cap 124 may include a hole 125. The rotor can 122 may also include a second cover 102 such that the wall 126 is positioned between the end cap 124 and the second cover 102. The rotor 106 includes one or more magnets 128 aligned along the wall 126 and attached to the wall 126. The placement of the magnets 128 is configured based on the magnetic poles in the motor assembly 100. The motor assembly 100 also includes a rolling element bearing arrangement (not shown) that is configured to facilitate rotation of the rotor 106 during operation of the motor assembly 100.

[0020] In operation, the direction of current flowing through windings 110 is switched by inputting alternating current (AC) or switching direct current (DC), thereby generating a magnetic field that rotates in space. Magnets 128 of rotor 106 follow the rotating magnetic field, causing rotor 106 to rotate and generate torque from the rotation.

[0021] In an exemplary embodiment, the rotor 106 includes a first cover 118 and fins 120 coupled to the first cover 118. In the depicted embodiment, the end cover 124 is the first cover 118, and the fins 120 are coupled to the end cover 124. In some embodiments, the first cover 118 is a separate component from the end cover 124 and is positioned adjacent to the end cover 124. The fins 120 are positioned at a portion of the first cover 118 that is radially more inward than the stator 104, and are received in a radially inward space or cavity 112 defined by the stator 104. In a typical outer rotor motor assembly, the cavity 112 is not used or not fully used, so that there is still available space in the cavity 112 to accommodate components such as the fins 120. Therefore, positioning the fins 120 in the cavity 112 does not change the form factor or axial length 130 of the motor assembly 100. The axial length of the motor assembly is the length of the motor assembly in the axial direction. The fins 120 are axially positioned or extend axially in the motor assembly 100. The fins 120 are axially aligned with each other and a gap is defined between adjacent fins 120. The fins 120 include a fin body 132. In the depicted embodiment, the fins 120 include a tab 134 from which the fin body 132 extends. The fins 120 are attached to the first cover 118 at the tab 134 via an attachment mechanism such as welding or a fastener 136 (e.g., a rivet). In some embodiments, the fins 120 extend directly from the first cover 118. The fins 120 are cut from the first cover 118 by cutting along the sides of the fins 120 and bending the fins 120 toward the interior of the rotor shield 122. Additional fin bodies 132 can be attached to the cut fins 120 to increase the overall length of the fins 120.

[0022] In the exemplary embodiment, the motor assembly 100 includes a second cover 102 positioned opposite the first cover 118, with the stator 104 positioned between the first cover 118 and the second cover 102. Apertures 138 are defined in the second cover 102 of the motor assembly 100. The apertures 138 streamline air flow through the motor assembly 100, thereby improving the performance of the motor assembly 100.

[0023] In operation, when the motor rotates, cooling air is drawn from one end through holes 125 in end cap 124 (see Figure 1C) or holes 138 on the second cover 102 are drawn into the motor assembly 100. The air is guided toward the stator 104 by the fins 120, flows through the spaces between the fins 120 and around the stator 104, and is discharged from the other end of the motor assembly 100 through the holes 138 of the second cover 102 or the holes 125 on the end cover 124. The air carries away the heat from the stator 104, thereby dissipating the heat out of the motor assembly 100. Further, since the fins 120 are attached to the rotor shield 122, the fins 120 rotate with the rotor 106 and act as an internal fan to cool the motor assembly 100. The air flow in the motor assembly 100 is streamlined, with the increased air flow of the fins 120 acting as a fan following the same path and direction as the air flows through the holes 125, 138, the fins 120, and the stator 104.

[0024] In the depicted embodiment, the fins 120 are curved with a curvature oriented in one direction, such as clockwise when viewed toward the first cover 118 ( Figure 1B ) or counterclockwise. The motor assembly 100 with curved fins 120 operates more efficiently in one rotational direction that is the same as the orientation of the curvature than in another direction. In some embodiments, the fins 120 are straight, wherein the fin bodies 132 are not curved or bent. The motor assembly 100 with straight fins 120 can be bidirectional, wherein the rotation of the motor assembly 100 can be clockwise or counterclockwise.

[0025] The motor assembly 100 is an outer rotor motor in which the rotor 106 is positioned outside the stator 104. In an inner rotor motor, the rotor is positioned inside the stator and typically drives the shaft to rotate. Compared to inner rotor motors, outer rotor motors have relatively large torque and relatively short axial length because the rotor is positioned outside the stator. The relatively short axial length is advantageous in applications because the relatively short axial length requires less space to accommodate the motor, thereby reducing the overall size of the equipment. Further, in equipment such as fans, the relatively short axial length reduces the distance between the motor and the heat sink, thereby improving the efficiency of the fan.

[0026] In industrial applications, motors typically run continuously for relatively long periods of time, such as months or even years. When the motor is running, the current flowing through the stator generates heat. In an inner rotor motor, the heat source of the stator is located near the outside of the motor, and the heat is easily dissipated to the surrounding environment. In contrast, in an outer rotor motor, the stator is located inside the motor, and the dissipation of the heat generated from the stator is limited to mechanisms such as convection of the rotor shield of the motor. Therefore, outer rotor motors tend to overheat and fail after extended operating cycles. Due to the heat dissipation problem, outer rotor motors are not generally used in industrial applications and are limited to non-industrial applications, such as appliances that only operate a few hours a day (such as washing machines).

[0027] In some known outer rotor motors, holes are included in the rotor shield, and heat is dissipated through the holes. These holes only transfer limited heat. Fins positioned on the rotor shield and above the stator may be included to transfer heat from the stator away from the inside of the motor. However, the added fins increase the axial length of the motor, offsetting the advantage of the relatively short axial length of the outer rotor motor. In order to maintain the relatively short axial length, the fins are relatively short, limiting the heat transfer of the fins. Therefore, despite the addition of features to improve heat dissipation, the known outer rotor motors cannot meet the needs of industrial applications and are limited to non-industrial applications.

[0028] In contrast, the motor assembly described herein retains the relatively short axial length of the outer rotor motor by including fins at the existing space of the outer rotor motor, while maintaining the effectiveness of the motor with increased heat dissipation. Heat is effectively dissipated from the motor through mechanisms such as fins and streamlined air flow through the motor assembly, thereby enabling the outer rotor motor to be used in industrial applications. In industrial applications, the use of the outer rotor motor assembly described herein instead of the inner rotor motor is beneficial to reduce the form factor of the equipment and increase the torque of the motor. The use of the outer rotor motor described herein is also advantageous in reducing equipment costs because outer rotor motors are generally cheaper than inner rotor motors.

[0029] Since outer rotor motors are typically used for non-industrial applications, the goal of manufacturing outer rotor motors is to keep costs low. The rotor shield of the outer rotor motor is manufactured using progressive stamping and perforation. The metal sheet is stamped into the desired shape and holes are perforated in the metal sheet. In known outer rotor motors, holes are perforated on the rotor shield to improve heat dissipation and fins are produced from the perforated holes. Therefore, the same manufacturing assembly line can be used without significantly increasing costs. Therefore, people in the field have no motivation to modify the outer rotor motor assembly by providing separate fins in the motor assembly, because the modification requires additional materials and changes in the manufacturing process and assembly line, increasing the cost of the outer rotor motor.

[0030] In contrast, the assemblies and methods described herein are advantageous in facilitating the use of outer rotor motor assemblies in industrial applications while maintaining the advantages of outer rotor motor assemblies over inner rotor motors in terms of form factor, torque, and cost. The performance of the motor assembly is significantly improved without changing the form factor of the motor assembly. The incorporation of fins into the motor assembly does not result in a significant increase in cost, making the outer rotor assembly described herein still relatively inexpensive compared to inner rotor motors.

[0031] Figure 2 Another example motor assembly 100-2 is shown in exploded view. Figures 1A to 1C Compared to the motor assembly 100 shown, in which the first cover 118-2 is the end cover 124 or is positioned near the end cover 124, the first cover 118-2 is positioned opposite the end cover 124, and the stator 104 is located therebetween. The fins 120 are positioned on the first cover 118-2 and coupled thereto. The first cover 118-2 is coupled to the end cover 124. During operation of the motor assembly 100-2, the fins 120 and the first cover 118-2 rotate with the end cover 124, thereby cooling the motor assembly 100-2. The motor assembly 100 includes a second cover 102 positioned opposite the end cover 124, and the stator 104 is positioned between the end cover 124 and the second cover 102. The motor assembly 100 also includes a cover 202. The outer diameter 204 of the second cover 102 is greater than the outer diameter 206 of the cover 202. The second cover 102 includes a plurality of holes 138. The holes 138 are sized to receive fasteners (not shown) therethrough to couple the second cover 102 to the stator 104, wherein the second cover 104 is positioned above the stator 104. The cover 202 includes holes sized to receive fasteners therethrough to couple the cover 202 to the stator 104.

[0032] In operation, as the rotor 106 rotates, air is drawn in through one end of the motor assembly 100-2, either through the holes 138 in the second cover 102 or through the holes 125 in the end cover 124. The air then travels through the fins 120 and out the other end of the motor assembly 100-2, either through the holes 125 in the end cover 124 or through the holes 138 in the second cover 102. Further, the fins 120 act as an internal fan, increasing air flow while carrying heat away from the stator 104 and out of the motor assembly.

[0033] Figure 3 Yet another embodiment of a motor assembly 100-3 is shown. In an exemplary embodiment, the motor assembly 100 includes a plurality of stators 104. A gap 302 is defined between adjacent stators 104. The stators 104 are axially aligned. Two stators 104 are depicted as an example. Three or more stators 104 may be included in the motor assembly 100. Multiple stacks increase the power of the motor assembly 100. The gap 302 provides an additional channel to dissipate heat from the motor assembly 100 and reduce turbulence in the air flow, thereby improving heat dissipation efficiency.

[0034] Figure 4A and 4B An example fan assembly 400 including the motor assembly 100 is shown. Figure 4A 4 is a perspective view of a fan assembly 400. In an exemplary embodiment, the fan assembly 400 includes one or more blades 402. The blades 402 are coupled to the motor assembly 100. In operation, the blades 402 are driven by the motor assembly 100 and rotate.

[0035] In an exemplary embodiment, the blade 402 is curved with a curvature oriented in one direction, such as clockwise ( Figure 4A ) or counterclockwise. The curvature orientation of the fin 120 of the motor assembly 100 is the same as the curvature orientation of the blade 402. In this case, the air flow from the fin 120 and the blade 402 is combined to form an increased axial combination, thereby streamlining the air flow and strengthening the air flow. The blade 402 can also be formed to generate radial air flow. In this case, the air flow from the fin 120 and the blade is also combined.

[0036] Figure 4B A computer simulation of an example air flow 404 of a fan assembly 400 is shown. Arrow 406 represents the velocity vector of the air. The shading of the arrow represents the relative velocity of the air flow. As shown, the magnitude of the velocity vector increases as the air flow passes through the narrow space around the stator 104 and is exhausted from the motor assembly 100. The air flow directed by the fins 120 of the motor assembly 100 is generally in the same direction as the air flow driven by the blades, thereby effectively cooling the motor and directing the air flow for use by the fan assembly 400.

[0037] Figure 5 5 is a flow chart of an example method 500 for assembling an electric machine assembly. In an example embodiment, the method 500 includes forming 502 a stator. The example stator may be the stator 104 described herein. The method 500 also includes forming 504 a rotor. The example rotor may be the rotor 106 described herein. The method 500 also includes positioning 506 a rotor wall outside the stator. Additionally, the method 500 includes positioning 508 a first cover 118 of the rotor 106 such that the fins 120 are received in the cavity 112.

[0038] The design of the fins 120 can be optimized via computer simulation. For example, a 3D model of air flow and / or heat can be constructed based on the parameters of the fins 120, such as the number of fins, size, orientation, curvature, shape, spacing between adjacent fins, fin material, and / or other parameters (see Figure 4B ). The parameters are adjusted to optimize the performance of the motor assembly 100 to meet a predefined condition. The predefined condition may be a condition where the heat is below a threshold level or the air volume is maximized. For example, the heat exhausted from the motor assembly 100 may be limited to a desired threshold so that the motor assembly 100 is not damaged by heat during operation. In another example, by optimizing the parameters, the motor assembly 100 is optimized to achieve a maximum air volume moved at a specific speed of the motor assembly 100.

[0039] At least a portion of the methods described herein may be implemented in any suitable computer device 800 and software implemented therein. Figure 6 800. In an example embodiment, the computer device 800 includes a user interface 804 that receives at least one input from a user. The user interface 804 may include a keyboard 806 that enables the user to enter relevant information. The user interface 804 may also include, for example, a pointing device, a mouse, a stylus, a touch-sensitive panel (e.g., a touch pad and a touch screen), a gyroscope, an accelerometer, a position detector, and / or an audio input interface (e.g., including a microphone).

[0040] Moreover, in an exemplary embodiment, the computer device 800 includes a presentation interface 817 that presents information (such as input events and / or verification results) to a user. The presentation interface 817 may also include a display adapter 808 coupled to at least one display device 810. More specifically, in an exemplary embodiment, the display device 810 may be a visual display device such as a cathode ray tube (CRT), a liquid crystal display (LCD), a light emitting diode (LED) display, and / or an "electronic ink" display. Alternatively, the presentation interface 817 may include an audio output device (e.g., an audio adapter and / or a speaker) and / or a printer.

[0041] The computer device 800 also includes a processor 814 and a memory device 818. The processor 814 is coupled to the user interface 804, the presentation interface 817, and the memory device 818 via the system bus 820. In an example embodiment, the processor 814 communicates with a user, such as by prompting the user via the presentation interface 817 and / or by receiving user input via the user interface 804. The term "processor" generally refers to any programmable system, including system and microcontrollers, reduced instruction set computers (RISC), complex instruction set computers (CISC), application specific integrated circuits (ASICs), programmable logic circuits (PLCs), and any other circuits or processors capable of performing the functions described herein. The above examples are for illustration purposes only and are therefore not intended to limit the definition and / or meaning of the term "processor" in any way.

[0042] In an example embodiment, the memory device 818 includes one or more devices capable of storing and retrieving information, such as executable instructions and / or other data. Furthermore, the memory device 818 includes one or more computer-readable media, such as, but not limited to, dynamic random access memory (DRAM), static random access memory (SRAM), a solid state disk, and / or a hard disk. In an example embodiment, the memory device 818 stores, but is not limited to, application source code, application object code, configuration data, additional input events, application status, assertion statements, verification results, and / or any other type of data. In an example embodiment, the computer device 800 may also include a communication interface 830 coupled to the processor 814 via the system bus 820. Furthermore, the communication interface 830 is communicatively coupled to a data acquisition device.

[0043] In an example embodiment, the processor 814 may be programmed by encoding operations using one or more executable instructions and providing the executable instructions in the memory device 818. In an example embodiment, the processor 814 is programmed to select a plurality of measurements received from the data acquisition device.

[0044] In operation, the computer executes computer executable instructions implemented in one or more computer executable components stored on one or more computer readable media to implement various aspects of the present invention described and / or illustrated herein. Unless otherwise specified, the execution or fulfillment order of the operations in the embodiments of the present invention illustrated and described herein is not required. That is, unless otherwise specified, the operations can be performed in any order, and embodiments of the present invention may include additional or fewer operations than the operations disclosed herein. For example, it is contemplated that performing or performing a specific operation before, concurrently with, or after another operation is within the scope of various aspects of the present invention.

[0045] At least a portion of the methods described herein may also be implemented using the server computer device 1001 . Figure 7 An example configuration of a server computer device 1001 is illustrated. The server computer device 1001 also includes a processor 1005 for executing instructions. For example, the instructions may be stored in a memory area 1030. The processor 1005 may include one or more processing units (eg, in a multi-core configuration).

[0046] The processor 1005 is operably coupled to a communication interface 1015, enabling the server computer device 1001 to communicate with a remote device or another server computer device 1001. For example, the communication interface 1015 may receive data from the system 12 via the Internet.

[0047] The processor 1005 may also be operably coupled to a storage device 1034. The storage device 1034 is any computer-operated hardware suitable for storing and / or retrieving data. In some embodiments, the storage device 1034 is integrated into the server computer device 1001. For example, the server computer device 1001 may include one or more hard disk drives as the storage device 1034. In other embodiments, the storage device 1034 is located outside the server computer device 1001 and can be accessed by multiple server computer devices 1001. For example, the storage device 1034 may include multiple storage units, such as hard disks and / or solid-state disks in a redundant array of independent disks (RAID) configuration. The storage device 1034 may include a storage area network (SAN) and / or a network attached storage (NAS) system.

[0048] In some embodiments, the processor 1005 is operably coupled to the storage device 1034 via the storage interface 1020. The storage interface 1020 is any component capable of providing the processor 1005 with access to the storage device 1034. The storage interface 1020 may include, for example, an Advanced Technology Attachment (ATA) adapter, a Serial ATA (SATA) adapter, a Small Computer System Interface (SCSI) adapter, a RAID controller, a SAN adapter, a network adapter, and / or any component that provides the processor 1005 with access to the storage device 1034.

[0049] At least one technical effect of the systems and methods described herein includes: (a) fins positioned in an existing cavity of an electric machine to increase heat dissipation; and (b) holes defined in a cover of the electric machine to streamline air flow through the electric machine.

[0050] Example embodiments of motor assemblies and methods of assembling motor assemblies are described in detail above. The systems and methods are not limited to the specific embodiments described herein, but rather, components of the systems and / or operations of the methods can be used independently and separately from other components and / or operations described herein. Further, the components and / or operations described can also be defined in or used in combination with other systems, methods, and / or devices, and are not limited to practice using only the systems described herein.

[0051] As used herein, an element or step listed in the singular and beginning with the word "one" or "an" should be understood as not excluding multiple elements or steps, unless such exclusion is explicitly listed. In addition, reference to "an example" or "an example" of the present disclosure is not intended to be interpreted as excluding the existence of additional examples that also incorporate the listed features. Further, to the extent that "includes", "including", "having", "including" and variations thereof are used herein, such terms are intended to be inclusive in a manner similar to the term "comprises" as an open transition word, without excluding any additional elements or other elements.

[0052] Although specific features of various embodiments of the present invention may be shown in some drawings but not in other drawings, this is for convenience only. According to the principles of the present invention, any feature of the drawings may be referenced and / or claimed in combination with any feature of any other drawings.

[0053] This written description uses examples to disclose the invention, including the best mode, and also to enable any person skilled in the art to practice the invention, including making and using any devices or systems and performing any incorporated methods. The patentable scope of the invention is defined by the claims, and may include other examples that occur to one skilled in the art. Such other examples are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal language of the claims.

Claims

1. An outer rotor motor assembly for industrial applications, comprising: a stator including a stator core defining a cavity; as well as a rotor comprising a wall and one or more magnets aligned along the wall, the wall being positioned outside the stator, the rotor further comprising a first cover coupled to the wall and one or more fins positioned on the first cover, Wherein the one or more fins are received in the cavity.

2. The outer rotor motor assembly of claim 1, wherein the one or more fins are curved.

3. The outer rotor motor assembly of claim 1, wherein the one or more fins are straight.

4. The outer rotor motor assembly of claim 1 further comprising a second cover defining one or more apertures, wherein the rotor further comprises an end cover, the wall extending from the end cover, the end cover defining one or more apertures, and the second cover and the end cover are positioned relative to each other, the stator being positioned between the second cover and the end cover. 5 . The outer rotor motor assembly of claim 4 , wherein the second cover is coupled to the stator.

6. The outer rotor motor assembly of any one of claims 1 to 5, further comprising a plurality of stators, wherein the plurality of stators are axially aligned and define gaps between adjacent stators.

7. An outer rotor motor assembly according to any one of claims 1 to 5, wherein the one or more fins are axially aligned with each other.

8. An outer rotor motor assembly according to any one of claims 1 to 5, wherein the fins extend directly from the first cover.

9. A method of assembling an outer rotor motor assembly for industrial applications, comprising: forming a stator, the stator comprising a stator core, the stator core defining a cavity; forming a rotor comprising a wall and one or more magnets aligned along the wall, the rotor further comprising a first cover and one or more fins positioned on the first cover; positioning the wall outside the stator; as well as The first cover is positioned such that the one or more fins are received in the cavity.

10. The method of claim 9, wherein the one or more fins are optimized by: One or more parameters of the one or more fins are adjusted such that a predefined condition is met.

11. The method of claim 9, wherein the one or more fins are curved.

12. The method of claim 9, wherein the one or more fins are straight.

13. The method of claim 9, wherein the rotor further comprises an end cap, the wall extending from the end cap, the end cap defining one or more apertures, and the method further comprising: A second cover is positioned opposite the end cover, the stator being positioned between the second cover and the end cover, the second cover defining one or more apertures.

14. The method according to claim 13, further comprising: The second cover is coupled to the stator.

15. The method according to any one of claims 9 to 14, further comprising: forming a plurality of stators; as well as The plurality of stators are axially aligned with gaps between adjacent stators.

16. The method of any one of claims 9 to 14, wherein the one or more fins are axially aligned with each other.

17. A method according to any one of claims 9 to 14, wherein the fins extend directly from the first cover.

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