Motor and method for processing and assembling a motor

Abstract

The application discloses a motor and a processing and assembling method of the motor. The motor comprises a stator and a heat transfer element, the heat transfer element is adjacent to a stator yoke of the stator, two ends of the heat transfer element in the axial direction of the motor respectively comprise a heat absorption section and a heat dissipation section, the heat absorption section is arranged close to the axial end of the stator and can absorb heat, the heat dissipation section is arranged close to the middle section of the stator and can release heat, the heat absorbed by the heat absorption section of the axial end of the stator can be transmitted to the heat dissipation section through the heat transfer element for release. The heat absorption section can absorb the heat of the axial end of the stator at a higher temperature, and transmit the heat to the middle section of the stator at a lower temperature through the heat dissipation section of the heat transfer element, so that the whole stator is heated more uniformly, the temperature of the axial end of the stator is reduced, the local hotspot effect of the axial end of the stator, especially the end of the stator winding, is relieved, the thermal resistance of the motor is reduced, the insulation failure of the end of the stator winding is prevented, the performance of the motor is ensured, and then the torque density of the motor is improved.

Description

Technical Field

[0001] This invention relates to the field of electric motors, and particularly to an electric motor and a method for processing and assembling the electric motor. Background Technology

[0002] Torque density is one of the most critical performance indicators of a motor. In applications such as aerospace, where weight and size are extremely important, the motor's torque density directly impacts the performance of the entire system, and its importance is particularly pronounced with the current trend towards electrification in aircraft. A major bottleneck in achieving high torque density in motors is temperature rise. Excessive temperature in components such as winding insulation, permanent magnets, and bearings can lead to performance degradation or even complete failure of the motor. To prevent the critical components from overheating, it is necessary to control the current to manage motor losses, but this also limits the torque density. On the other hand, it is essential to design a highly efficient and reliable cooling system to minimize the motor temperature under the same loss conditions.

[0003] Natural cooling remains the most common cooling method for smaller motors, such as aerospace servo motors. This is primarily because high reliability requirements exist in practical applications. Introducing active cooling systems not only increases the overall size and internal complexity of the motor but also introduces new risks. Especially in aerospace applications, maintenance is often difficult or impossible, further reducing the adoption of active cooling. However, the biggest drawback of natural cooling is its significantly lower efficiency compared to active liquid or air cooling, thus limiting the improvement of motor torque density. In motors, windings are wound around the stator core. The ends of these windings (i.e., the axial ends of the stator) often become localized hot spots, and the insulation at these ends is more prone to failure, negatively impacting the improvement of motor torque. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defect that the winding ends of the motor are prone to local hot spots, which limit the torque density of the motor, and to provide a motor and a method for processing and assembling the motor.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] An electric motor includes a stator, the stator including a stator core and a stator winding, the stator core including stator teeth and a stator yoke, the electric motor further including a heat transfer element adjacent to the stator yoke; at least a portion of the heat transfer element extends along the axial direction of the electric motor, and each end of the heat transfer element along the axial direction of the electric motor includes a heat absorption section and a heat dissipation section, the heat absorption section being connected to the heat dissipation section;

[0007] The heat-absorbing section is located near the axial end of the stator and is capable of absorbing heat, while the heat-dissipating section is located near the middle section of the stator and is capable of releasing heat. The heat absorbed by the heat-absorbing section from the axial end of the stator can be transferred to the heat-dissipating section for release through the heat transfer element.

[0008] In this design, the temperature at the stator winding ends (i.e., the axial ends of the stator) is higher, while the temperature in the middle section of the stator is lower. The heat-absorbing section of the heat transfer element is positioned close to the axial ends of the stator (i.e., close to the stator winding ends), allowing it to absorb heat from the higher-temperature axial ends and transfer this heat to the lower-temperature middle section of the stator via the heat dissipation section of the heat transfer element. This results in more uniform heating of the stator as a whole, particularly reducing the temperature at the axial ends, alleviating localized hot spot effects, especially at the stator winding ends, reducing the motor's thermal resistance, improving cooling efficiency, preventing insulation failure at the stator winding ends, ensuring motor performance, and ultimately improving torque density.

[0009] Preferably, the stator yoke is provided with a first receiving groove for accommodating the heat transfer element, the first receiving groove extending along the axial direction of the motor, and at least a portion of the heat dissipation section is accommodated in the first receiving groove.

[0010] In this design, a first receiving slot is created on the stator yoke to accommodate some of the heat transfer elements. This increases the contact area between the heat transfer elements and the stator yoke, improving heat transfer efficiency, and also makes the motor structure more compact. Furthermore, since the stator teeth are used to wind the stator windings, placing the first receiving slot on the stator yoke avoids occupying space for the stator windings, ensuring a high slot fill factor and a short winding end length, thus reducing the impact on the magnetic circuit of the stator core and the overall electromagnetic performance of the motor, which is beneficial for achieving high torque density in the motor.

[0011] Preferably, the stator is an outer stator, and the motor further includes a housing, the inner side of which fits against the outer side of the stator yoke, and the housing is provided with a second receiving groove;

[0012] The first receiving groove is recessed radially inward from the outer side of the stator, and the second receiving groove is recessed radially outward from the inner side of the housing. The first receiving groove and the second receiving groove are located in the same circumferential direction of the motor. The first receiving groove and the corresponding second receiving groove cooperate to form a receiving cavity for accommodating the heat transfer element.

[0013] In this design, the aforementioned arrangement reduces the size of the first receiving slot on the stator core, mitigating the impact of opening the first receiving slot on electromagnetic performance and facilitating the achievement of high torque density in the motor. The heat dissipated by the heat dissipation section can be dissipated through the housing, further improving the motor's cooling effect. This arrangement ensures that the heat from the heat dissipation section can be conducted to the housing with minimal thermal resistance.

[0014] Preferably, the receiving cavity extends through one end of the heat-absorbing section along the axial direction of the motor.

[0015] In this scheme, the above arrangement allows the heat-absorbing section of the heat transfer element to extend beyond the axial end of the stator core, making the heat-absorbing section closer to the end of the stator winding.

[0016] Preferably, the receiving cavity is closed at one end near the heat dissipation section along the axial direction of the motor.

[0017] In this solution, the above-mentioned arrangement enables the heat transfer element to be quickly positioned in the axial direction of the motor during assembly, restricts the movement of the heat transfer element in the axial direction of the stator, and ensures that multiple heat transfer elements located at the same axial end of the stator are flush in the axial direction of the motor.

[0018] Preferably, one of the first receiving slots and one of the stator teeth are located in the same circumferential direction of the motor.

[0019] In this scheme, the above-mentioned settings can reduce the influence of heat transfer elements on the magnetic circuit of the stator yoke, ensure the electromagnetic performance of the motor, and help to achieve high torque density of the motor.

[0020] Preferably, there are multiple stator teeth, which are spaced apart along the circumferential direction of the motor. Each stator tooth is wound with a stator winding. The heat-absorbing section is disposed between two adjacent stator teeth and is located on the axial outer side of the stator winding wound on the corresponding stator tooth.

[0021] In this scheme, the above configuration enables one heat transfer element to transfer heat to the stator windings on two stator teeth, resulting in higher heat transfer efficiency and better mitigation of local hot spot effects at the ends of the stator windings.

[0022] Preferably, the heat-absorbing section extends along the radial direction of the motor, the heat-dissipating section extends along the axial direction of the motor, and the heat-absorbing end of the heat-absorbing section is close to the stator winding of the stator.

[0023] In this scheme, the above arrangement allows the heat-absorbing section of the heat transfer element to be closer to the stator winding with a higher temperature, absorbing the heat at the end of the stator winding and alleviating the local hot spot effect at the end of the stator winding.

[0024] Preferably, the heat-absorbing section is located outside the stator winding in the axial direction of the motor.

[0025] In this scheme, the above-mentioned arrangement is used to prevent interference between the heat transfer element and the stator while bringing the heat absorption section closer to the stator winding, and to reduce the impact on the magnetic circuit, thereby ensuring the electromagnetic performance of the motor and facilitating the achievement of high torque density in the motor.

[0026] Preferably, a heat-absorbing plate is installed on the heat-absorbing section, and the cross-sectional dimension of the heat-absorbing plate is larger than the cross-sectional dimension of the heat-absorbing section.

[0027] In this design, the heat-absorbing fins are used to increase the heat-absorbing area of ​​the heat-absorbing section, which can absorb more heat from the axial end of the stator and improve the cooling effect of the axial end of the stator.

[0028] Preferably, there are multiple heat transfer elements, and at least one heat transfer element is provided at both ends of the stator along the axial direction; the heat transfer elements at both ends of the stator are staggered along the circumferential direction of the motor.

[0029] In this scheme, the above-mentioned arrangement ensures that both axial ends of the stator have heat-absorbing sections for heat absorption, so that both axial ends of the stator can be fully dissipated. On the other hand, it also prevents the two heat transfer elements at both ends of the axial direction from interfering with each other, ensuring the reliability of heat transfer of the heat transfer elements.

[0030] Preferably, the heat transfer element is a heat pipe.

[0031] In this design, the heat pipe has high heat transfer efficiency and good heat transfer effect.

[0032] A stator-type permanent magnet motor includes a stator, which is an outer stator. The stator includes a stator core, a housing, and a plurality of permanent magnets. The inner side of the housing is attached to the outer side of the stator core. The stator core includes a plurality of stator core blocks spaced apart along the circumferential direction of the motor. A receiving space for accommodating the permanent magnets is formed between two adjacent stator core blocks. The permanent magnets are engaged with the stator core blocks. The housing is provided with a plurality of permanent magnet receiving slots spaced apart along the circumferential direction of the motor. The permanent magnet receiving slots are recessed radially outward from the inner side of the housing. The permanent magnet receiving slots and the corresponding receiving spaces for the permanent magnets are located in the same circumferential direction of the motor.

[0033] In this design, a permanent magnet receiving groove is provided on the housing to accommodate the permanent magnet, facilitating rapid positioning of the permanent magnet. This, in turn, facilitates rapid positioning of the stator core segments that engage with the permanent magnet, reducing the assembly precision requirements for both the permanent magnet and the stator core segments and accelerating assembly efficiency. Furthermore, the permanent magnet and stator core segments can be assembled directly with the housing. Since both the permanent magnet and the stator core segments are in direct contact with the housing, the roundness of the entire stator is ensured, thereby guaranteeing uniform air gap in the electrical components.

[0034] Preferably, the stator core block is a U-shaped structure with its opening facing the radial inner side of the stator; along the circumferential direction of the motor, the stator core block has a first stator core block unit and a second stator core block unit for forming the two side walls of the U-shaped structure; the width of the first stator core block unit in the circumferential direction of the motor is greater than the width of the second stator core block unit in the circumferential direction of the motor;

[0035] For two adjacent stator core blocks, the first stator core block unit of one stator core block is adjacent to the first stator core block unit of the other stator core block; or, the second stator core block unit of one stator core block is adjacent to the second stator core block unit of the other stator core block.

[0036] In this scheme, the above settings take into account the slight asymmetry of the magnetic circuit when the armature magnetic field and the permanent magnet magnetic field act under motor load operation; on the other hand, they ensure that the operator has a clear reference, so that the stator core blocks and permanent magnets are not easily installed in the wrong positions.

[0037] Preferably, the stator-type permanent magnet motor further includes a rotor, the rotor including a rotor core and a rotor winding, the rotor core including rotor teeth and rotor slots, and the rotor winding being an armature winding.

[0038] In this scheme, the rotor's armature winding can also generate electromagnetic torque.

[0039] A method for machining and assembling an electric motor, the motor comprising a housing and a stator, the stator being an outer stator, the method being used for the motor as described above, the method comprising the following steps:

[0040] The stator core and permanent magnet of the stator are installed in the housing, and the first receiving groove on the stator is aligned with the second receiving groove on the housing to form a receiving cavity for accommodating the heat transfer element;

[0041] The stator windings of the stator are installed on the stator core;

[0042] The heat transfer element is placed inside the receiving cavity.

[0043] In this design, the heat transfer element is accommodated by a first receiving slot on the stator and a second receiving slot on the housing. This allows for the addition of a heat transfer element without occupying additional space in the motor, ensuring a compact motor structure. Positioning the heat transfer element away from the stator windings reduces its impact on the magnetic circuit, minimizing localized hot spots at the stator winding ends and facilitating high torque density in the motor.

[0044] Preferably, during the alignment of the first and second receiving grooves, the sample of the heat transfer element is inserted into the receiving cavity;

[0045] If the sample block of the heat transfer element can be inserted into the receiving cavity, then it is determined that the first receiving groove and the second receiving groove are aligned;

[0046] If the sample block of the heat transfer element cannot be inserted into the receiving cavity, it is determined that the first receiving groove and the second receiving groove are not aligned, and the position of the stator core needs to be adjusted.

[0047] This solution provides a method for determining whether the first receiving groove and the second receiving groove are aligned, which can adjust the position of the stator core in a timely manner when the first receiving groove and the second receiving groove are not completely aligned.

[0048] Preferably, after the first receiving groove and the second receiving groove are aligned, the sample block that replaces the heat transfer element is installed.

[0049] In this solution, the heat transfer element is replaced after the first and second receiving grooves are aligned, which effectively prevents wear on the heat transfer element during stator assembly.

[0050] Preferably, after placing the heat transfer element inside the receiving cavity, the housing, the stator, and the heat transfer element are potted.

[0051] In this solution, the above-mentioned arrangement is used to fill the gaps between the housing, stator and heat transfer elements, which not only restricts the movement of the heat transfer elements in all directions, but more importantly, enhances the heat conduction effect and improves the heat transfer effect.

[0052] A method for machining and assembling an electric motor, the motor comprising a housing and a stator, the stator being an outer stator, the method being used for the motor as described above, the method comprising the following steps:

[0053] A permanent magnet receiving groove is provided on the housing to accommodate a portion of the permanent magnets;

[0054] Insert the permanent magnet or a sample of the permanent magnet into the permanent magnet receiving slot;

[0055] The stator core is divided into blocks and inserted between two adjacent permanent magnets or between permanent magnet samples in the circumferential direction of the motor.

[0056] In this scheme, the permanent magnet or a sample of a permanent magnet is first inserted into the permanent magnet receiving slot to position the permanent magnet relative to the housing. Then, the stator core block is inserted between two permanent magnets or permanent magnet samples to position the stator core block relative to the housing. This improves the assembly efficiency of the permanent magnet and stator core block and reduces the assembly precision requirements. Furthermore, since the permanent magnet and stator core block are assembled directly on the housing, they are in direct contact with the housing, ensuring the roundness of the entire stator and thus guaranteeing uniform air gap in the electrical components.

[0057] Preferably, if a sample of the permanent magnet is inserted into the permanent magnet receiving slot, then after the stator core is installed in sections, the permanent magnet is installed to replace the sample of the permanent magnet.

[0058] In this solution, the above steps are used to prevent wear on the permanent magnets during the assembly of the stator core in sections.

[0059] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0060] The positive and progressive effects of this invention are as follows: the heat-absorbing section of the heat transfer element is positioned close to the axial end of the stator (i.e., close to the end of the stator winding), allowing the heat-absorbing section to absorb heat from the higher-temperature axial end of the stator and transfer this heat to the lower-temperature middle section of the stator through the heat dissipation section of the heat transfer element. This results in more uniform heating of the entire stator, particularly reducing the temperature at the axial end of the stator, alleviating the local hot spot effect at the axial end of the stator, especially at the end of the stator winding, reducing the thermal resistance of the motor, improving the motor cooling effect, preventing insulation failure at the end of the stator winding, ensuring motor performance, and thus contributing to increased motor torque density. A permanent magnet receiving groove is provided on the housing to accommodate the permanent magnet, facilitating rapid positioning of the permanent magnet and, consequently, rapid positioning of the stator core segments that engage with the permanent magnet. This reduces the assembly precision requirements for the permanent magnet and stator core segments, accelerating assembly efficiency. Furthermore, the permanent magnet and stator core can be assembled with the housing in separate sections. Since the permanent magnet and stator core sections are directly attached to the housing, the roundness of the entire stator can be guaranteed, thereby ensuring the uniformity of the air gap in the electrical components. Attached Figure Description

[0061] Figure 1 A three-dimensional structural diagram of a motor with heat transfer elements in Embodiment 1 of the present invention.

[0062] Figure 2 A three-dimensional structural diagram of part of the stator structure in Embodiment 1 of the present invention.

[0063] Figure 3 A three-dimensional structural diagram of the heat transfer element in Embodiment 1 of the present invention.

[0064] Figure 4 A top view of part of the stator core in Embodiment 1 of the present invention.

[0065] Figure 5 A three-dimensional structural diagram of the motor after potting in Embodiment 1 of the present invention.

[0066] Figure 6 A three-dimensional structural diagram of the motor in Embodiment 2 of the present invention.

[0067] Figure 7 A three-dimensional structural diagram of the casing in Embodiment 2 of the present invention.

[0068] Figure 8 A three-dimensional structural diagram of the stator core blocks and their cooperation with permanent magnets in Embodiment 2 of the present invention.

[0069] Figure 9 A schematic diagram of the installation structure of the stator core blocks and permanent magnets on the housing in Embodiment 2 of the present invention.

[0070] Figure 10 A three-dimensional structural diagram of a motor with heat transfer elements in Embodiment 2 of the present invention.

[0071] Figure 11 A three-dimensional structural diagram of the stator with heat transfer elements in Embodiment 2 of the present invention.

[0072] Explanation of reference numerals in the attached figures:

[0073] Casing 1

[0074] Positioning Unit 11

[0075] Rotor 2

[0076] Rotor winding 21

[0077] Rotor core 22

[0078] Stator 3

[0079] Stator core 31

[0080] Stator teeth 311

[0081] Stator slot 312

[0082] Stator yoke 313

[0083] Stator core segmentation 314

[0084] First stator core segmentation unit 315

[0085] Second stator core segmentation unit 316

[0086] Stator winding 32

[0087] Heat transfer element 4

[0088] Heat absorption section 41

[0089] Transition section 42

[0090] Heat dissipation section 43

[0091] First receiving tank 51

[0092] Second receiving tank 52

[0093] Reception cavity 53

[0094] Protrusion 6

[0095] Heat absorber 7

[0096] 8 potting blocks

[0097] Permanent magnet 9

[0098] Permanent magnet receiving tank 10 Detailed Implementation

[0099] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0100] Example 1

[0101] like Figures 1-5 As shown, this embodiment provides an electric motor, including a housing 1, a stator 3, and a rotor 2. The stator 3 includes a stator core 31 and a stator winding 32. The stator core 31 has multiple stator teeth 311, stator slots 312, and a stator yoke 313. The multiple stator teeth 311 are spaced apart along the circumferential direction of the motor, and a stator winding 32 is wound on each stator tooth 311. This embodiment adopts an external stator and internal rotor structure. In the radial direction of the motor, the outer surface of the stator yoke 313 is in contact with the inner surface of the housing 1. The stator winding 32 is an armature winding and is a concentrated winding. One stator winding 32 is wound on each stator tooth 311 of the stator core 31, and each stator slot 312 contains a portion of two adjacent stator windings 32 in the circumferential direction of the motor. In other alternative embodiments, the stator winding 32 can also be other types of windings.

[0102] like Figures 1-3As shown, the motor also includes a heat transfer element 4, which is adjacent to the stator yoke 313 and is used to absorb heat from the axial end of the stator 3, especially the end of the stator winding 32. In this embodiment, the axial end of the stator 3 refers to the end of the stator 3 in the axial direction of the motor, and the end of the stator winding 32 refers to the end of the stator winding 32 in the axial direction of the motor.

[0103] like Figure 3 As shown, the heat transfer element 4 is a single unit, with at least a portion extending along the axial direction of the motor. Each end of the heat transfer element 4 along the axial direction of the motor includes a heat absorption section 41 and a heat dissipation section 43, which are connected as a single unit via a transition section 42. The heat absorption section 41 is positioned near the axial end of the stator 3 and is capable of absorbing heat. The heat dissipation section 43 is positioned near the middle section of the stator 3 and is capable of releasing heat. The heat absorbed by the heat absorption section 41 from the axial end of the stator 3 can be transferred to the heat dissipation section 43 for release. Specifically, the heat absorbed by the heat absorption section 41 from the axial end of the stator 3 is first transferred to the transition section 42, then to the heat dissipation section 43, and finally released via the heat dissipation section 43.

[0104] The temperature is higher at the axial ends of stator 3 (especially at the ends of stator winding 32), and lower in the middle section of stator. The heat-absorbing section 41 of the heat transfer element 4 is positioned close to the axial ends of stator 3 (i.e., close to the ends of stator winding 32), allowing it to absorb heat from the higher-temperature axial ends of stator 3 and transfer this heat through the heat dissipation section 43 to the lower-temperature middle section of stator 3. This results in more uniform heating of the stator 3 as a whole, particularly reducing the temperature at the axial ends of stator 3, alleviating localized hotspot effects, especially at the ends of stator winding 32, reducing motor thermal resistance, improving cooling efficiency, preventing insulation failure at the ends of stator winding 32, ensuring motor performance, and ultimately improving motor torque density. The heat dissipated by the heat dissipation section 43 can dissipate through the housing 1, further enhancing the motor's cooling effect.

[0105] like Figure 1 and Figure 2 As shown, in this embodiment, the heat transfer element 4 is disposed on the side of the stator yoke 313 away from the rotor 2 along the radial direction of the motor, i.e., on the radially outer side of the stator yoke 313. This further reduces the impact on the electromagnetic performance of the motor and is beneficial for achieving high torque density in the motor. In other alternative embodiments, the heat transfer element 4 can also be disposed on the side of the stator yoke 313 closer to the rotor 2 in the radial direction of the motor. However, in order to ensure the normal rotation of the rotor 2, the heat transfer element 4 must not interfere with the rotor 2. In order to minimize the impact on the magnetic circuit, the heat transfer element 4 should be disposed as close as possible to the stator yoke 313, i.e., close to the bottom of the stator slot 312.

[0106] like Figure 1 and Figure 2 As shown, the stator yoke 313 is provided with a first receiving groove 51 for accommodating the heat transfer element 4. The first receiving groove 51 extends along the axial direction of the motor, and at least a portion of the heat dissipation section 43 is accommodated within the first receiving groove 51, so that the heat dissipation section 43 can be positioned close to the middle section of the stator. The first receiving groove 51 on the stator yoke 313 for accommodating part of the heat transfer element 4 increases the contact area between the heat transfer element 4 and the stator yoke 313, improving heat transfer efficiency. Furthermore, since the first receiving groove 51 is located on the stator yoke 313, the portion of the heat transfer element 4 accommodated within the first receiving groove 51 occupies the motor space originally occupied by the stator yoke 313, thereby reducing the space required for additional heat transfer element 4 within the motor and making the motor structure more compact. Furthermore, since the stator teeth 311 are used to wind the stator winding 32, setting the first receiving slot 51 on the stator yoke 313 can avoid occupying the space for winding the stator winding 32, ensuring that the slot fill factor is as high as possible and the winding end length is as short as possible, reducing the impact on part of the magnetic circuit of the stator core 31 and the overall electromagnetic performance of the motor, which is conducive to achieving high torque density of the motor.

[0107] like Figure 1 As shown, a second receiving groove 52 is provided on the housing 1. The second receiving groove 52 is recessed radially outward from the inner side of the housing 1. A first receiving groove 51 and a second receiving groove 52 are located in the same circumferential direction of the motor. The first receiving groove 51 and the corresponding second receiving groove 52 cooperate to form a receiving cavity 53 for accommodating the heat transfer element 4. The shape of the receiving cavity 53 is similar to the outer contour of the heat transfer element 4, and the dimensions of the receiving cavity 53 in the radial and circumferential directions of the motor are only slightly larger than the dimensions of the heat transfer element 4 in the radial and circumferential directions of the motor, which is used to limit the movement of the heat transfer element 4 in the radial and circumferential directions of the motor to a certain extent. By opening a second receiving groove 52 on the housing 1 that cooperates with the first receiving groove 51, the size of the first receiving groove 51 on the stator core 31 can be reduced, the impact of opening the first receiving groove 51 on the electromagnetic performance can be reduced, which is beneficial to achieving high torque density of the motor. At the same time, it can ensure that the heat of the heat dissipation section 43 can be conducted to the housing 1 with a small thermal resistance.

[0108] Along the axial direction of the motor, the receiving cavity 53 is open at one end near the heat-absorbing section 41, allowing the heat-absorbing section 41 of the heat transfer element 4 to extend beyond the axial end of the stator core 31, bringing the heat-absorbing section 41 closer to the end of the stator winding 32. The other end of the receiving cavity 53 extends to the middle section of the stator, ensuring normal heat dissipation of the heat dissipation section 43. The end of the receiving cavity 53 near the heat dissipation section 43, i.e., the middle section of the stator, is closed, allowing the heat transfer element 4 to be quickly positioned along the axial direction of the motor during assembly, restricting the movement of the heat transfer element 4 along the axial direction of the stator 3, and ensuring that multiple heat transfer elements 4 located at the same axial end of the stator are flush along the axial direction of the motor. In other alternative embodiments, both ends of the receiving cavity 53 along the axial direction of the motor can also be open.

[0109] like Figure 1 and Figure 2 As shown, the positions of some of the first receiving slots 51 and stator teeth 311 correspond. One first receiving slot 51 and one of the stator teeth 311 are located in the same circumferential direction of the motor. The correspondence between the positions of the first receiving slots 51 and stator teeth 311 can reduce the influence of the heat transfer element 4 on the magnetic circuit of the stator yoke 313, ensure the electromagnetic performance of the motor, and help to achieve high torque density of the motor.

[0110] Another portion of the first receiving groove 51 corresponds to the position of the stator slot 312. This portion of the first receiving groove 51 is located between two adjacent stator teeth 311 in the circumferential direction of the motor, and the heat-absorbing section 41 of the heat transfer element 4 is located between two adjacent stator windings 32. This allows one heat transfer element 4 to transfer heat to the stator windings 32 on two stator teeth 311, resulting in a higher heat transfer effect and better mitigation of the local hot spot effect at the end of the stator windings 32. The heat-absorbing section 41 is located on the axial outer side of the stator winding 32 wound on the corresponding stator teeth 311 to avoid interference between the heat-absorbing section 41 and the stator windings 32.

[0111] like Figure 4 As shown, for the first receiving groove 51 corresponding to the position of the stator slot 312, a protrusion 6 is also provided at the corresponding position of the stator yoke. The protrusion 6 corresponds to this part of the first receiving groove 51. One protrusion 6 and one first receiving groove 51 are located in the same circumferential direction of the motor, and the protruding direction of the protrusion 6 is the same as the concave direction of the corresponding first receiving groove 51. The length of the protrusion 6 in the axial direction of the motor is the same as the length of the corresponding first receiving groove 51 in the axial direction of the motor. The protrusion 6 is used to supplement the part of the stator core 31 that is reduced due to the provision of the first receiving groove 51, improve electromagnetic performance, and help to achieve high torque density of the motor.

[0112] In this embodiment, there are two possible arrangements of the first receiving slot 51 in the circumferential direction of the motor: one corresponds to the stator tooth 311, and the other corresponds to the stator slot 312. In other alternative embodiments, the two arrangements can coexist or exist independently.

[0113] like Figure 3 As shown, in this embodiment, the heat transfer element 4 has an L-shaped structure. The heat absorption section 41 extends along the radial direction of the motor, with the heat absorption end of the heat absorption section 41 close to the stator winding 32. The heat dissipation section 43 extends along the axial direction of the motor, and the transition section 42 is bent at 90° to connect the heat absorption section 41 and the heat dissipation section 43. Designing the heat absorption section 41 to extend along the radial direction of the motor allows it to be closer to the higher-temperature stator winding 32, absorbing heat from the end of the stator winding 32 and alleviating the local hot spot effect at the end of the stator winding 32. In other alternative embodiments, the heat transfer element 4 can also be designed in other shapes, such as a straight line.

[0114] like Figure 1 and Figure 2 As shown, the heat-absorbing section 41 extends from one end of the first receiving groove 51 through the stator core 31. The heat-absorbing section 41 is located outside the stator winding 32 in the axial direction of the motor. This makes the heat-absorbing section 41 closer to the stator winding 32, prevents interference between the heat transfer element 4 and the stator 3, reduces the impact on the magnetic circuit, ensures the electromagnetic performance of the motor, and is conducive to achieving high torque density of the motor.

[0115] The length of the heat-absorbing section 41 in the radial direction of the motor should not be too long to prevent interference with the rotor 2 and affect the normal rotation of the rotor 2. In other alternative embodiments, if the rotor 2 has rotor windings, the heat-absorbing section 41 can be further extended towards the rotor 2, so that the heat-absorbing end of the heat-absorbing section 41 extends to the radial inner side of the air gap, close to the rotor windings, so that the heat transfer element 4 can not only alleviate the local hot spot effect at the end of the stator winding 32, but also alleviate the local hot spot effect at the end of the rotor windings.

[0116] like Figure 3 As shown, a heat-absorbing fin 7 is installed on the heat-absorbing section 41, and the cross-sectional dimension of the heat-absorbing fin 7 is larger than that of the heat-absorbing section 41. The heat-absorbing fin 7 is used to increase the heat-absorbing area of ​​the heat-absorbing section 41, enabling it to absorb more heat from the axial end of the stator 3 and improve the cooling effect of the axial end of the stator 3. In this example, the heat-absorbing fin 7 is a fin; in other alternative embodiments, the heat-absorbing fin 7 can also adopt other structures that can achieve the above-mentioned effects.

[0117] like Figure 1As shown, there are multiple heat transfer elements 4, with multiple heat transfer elements 4 provided at both ends of the stator 3 along the axial direction. Along the circumferential direction of the motor, the heat transfer elements 4 at both ends of the stator 3 are staggered. This ensures that both ends of the stator 3 have heat absorption sections 41 for heat absorption, allowing for sufficient heat dissipation at both ends. It also prevents interference between the two heat transfer elements 4 at both ends of the axial direction, ensuring the reliability of heat transfer. In other alternative embodiments, the number of heat transfer elements 4 at both ends of the stator 3 is not fixed, but is at least one.

[0118] like Figure 5 As shown, after the housing 1, stator 3, and heat transfer element 4 are assembled, the assembled structure needs to be potted to fill the gaps between the housing 1, stator 3, and heat transfer element 4. This not only restricts the movement of the heat transfer element 4 in all directions but, more importantly, enhances the heat conduction and transfer effect. If heat absorption is required at the axial end of the rotor 2, the heat absorption section 41 of the heat transfer element 4 can extend beyond the potting compound 8. It is important to note that the rotor 2 cannot be potted together with the heat transfer element 4, otherwise it will affect the rotor's rotation and the normal operation of the motor.

[0119] In this embodiment, the heat transfer element 4 is a heat pipe, and both the first receiving groove 51 and the second receiving groove 52 are semi-circular. The heat pipe has high heat transfer efficiency and good heat transfer effect. In other alternative embodiments, other structures capable of achieving the above effects can also be selected as the heat transfer element 4.

[0120] In this embodiment, there is no further limitation on the type of motor. The heat transfer element 4 described above can be applied to all motors including those with the stator and rotor types mentioned above, such as stator-type permanent magnet motors and rotor-type permanent magnet motors. Furthermore, it should at least ensure that the heat transfer element 4 does not interfere with other structures in the motor, thus guaranteeing the normal operation of the motor.

[0121] This embodiment also provides a method for machining and assembling an electric motor, used for machining and assembling the electric motor described above. The method for machining and assembling an electric motor includes the following steps:

[0122] The stator core 31 and permanent magnet of the stator 3 are installed in the housing 1, and the first receiving groove 51 on the stator 3 is aligned with the second receiving groove 52 on the housing 1 to form a receiving cavity 53 for accommodating the heat transfer element 4.

[0123] The stator winding 32 is installed on the stator core 31;

[0124] The heat transfer element 4 is placed inside the receiving cavity 53.

[0125] A first receiving groove 51 for accommodating part of the heat transfer element 4 is formed on the stator yoke 313 of the stator 3, and a second receiving groove 52 for accommodating part of the heat transfer element 4 is formed on the housing 1. The heat transfer element 4 is accommodated by the first receiving groove 51 on the stator 3 and the second receiving groove 52 on the housing 1. The addition of the heat transfer element 4 is achieved without occupying other space in the motor, ensuring a compact motor structure. The heat transfer element 4 is located on the side away from the stator winding 32, which reduces the impact on the magnetic circuit. This reduces the local hot spot effect at the end of the stator winding 32 and helps to achieve high torque density of the motor.

[0126] During the alignment process of the first receiving groove 51 and the second receiving groove 52, a sample of the heat transfer element 4 is inserted into the receiving cavity 53 to determine the alignment status 52 of the first receiving groove 51 and the second receiving groove. If the sample of the heat transfer element 4 can be inserted into the receiving cavity 53, it is determined that the first receiving groove 51 and the second receiving groove 52 are aligned; if the sample of the heat transfer element 4 cannot be inserted into the receiving cavity 53, it is determined that the first receiving groove 51 and the second receiving groove 52 are not aligned, and the position of the stator core 31 needs to be adjusted so that the first receiving groove 51 and the second receiving groove 52 are completely aligned, so that the position of the stator core 31 can be adjusted in time when the first receiving groove 51 and the second receiving groove 52 are not completely aligned.

[0127] After the first receiving groove 51 and the second receiving groove 52 are aligned, the sample of the heat transfer element 4 is pulled out from the receiving cavity 53, and the heat transfer element 4 is inserted into the receiving cavity 53 to replace the sample of the heat transfer element 4. Replacing the heat transfer element 4 after the first receiving groove 51 and the second receiving groove 52 are aligned effectively prevents wear on the heat transfer element 4 during the assembly of the stator 3.

[0128] Before placing the heat transfer element 4 into the receiving cavity 53, a fixing adhesive is applied to the outer surface of the heat transfer element 4. This adhesive further restricts the movement of the heat transfer element 4 in all directions, ensuring the reliability of the motor. After the heat transfer element 4 is completely fixed, the housing 1, stator 3, and heat transfer element 4 are encapsulated with insulating potting compound 8. Filling the gaps between the housing 1, stator 3, and heat transfer element 4 not only restricts the movement of the heat transfer element 4 in all directions but, more importantly, enhances thermal conductivity and improves heat transfer efficiency.

[0129] The heat transfer element 4 in this embodiment is applicable not only to motors with an outer stator and inner rotor structure as described above, but also to motors with an outer rotor and inner stator structure. Since the stator 3 is not attached to the housing 1 in a motor with an outer rotor and inner stator structure, it is not necessary to provide a second receiving groove 52 on the housing 1. A first receiving groove 51 that can accommodate the entire heat transfer element 4 can be directly provided on the stator core 31, or a second receiving groove 52 that cooperates with the first receiving groove 51 can be provided on other structures that are attached to the radial inner side of the stator 3. The specific arrangement can be adjusted according to the actual situation.

[0130] Example 2

[0131] The motor structure in this embodiment is basically the same as that in embodiment 1. The difference is that the motor in this embodiment is a stator-type permanent magnet motor, and the permanent magnet 9 is installed on one side of the stator 3.

[0132] like Figures 6-9 As shown, the motor in this embodiment also has an outer stator and inner rotor structure, including a stator 3 and a rotor 2. The stator 3 includes a stator core 31, a housing 1, and multiple permanent magnets 9. In the radial direction of the motor, the outer surface of the stator core 31 is in contact with the inner surface of the housing 1. The stator core 31 includes multiple stator core blocks 314 spaced apart along the circumferential direction of the motor, and a receiving space for accommodating the permanent magnets 9 is formed between adjacent stator core blocks 314. In the circumferential direction of the motor, the permanent magnets 9 are engaged with the stator core blocks 314, and the width of the permanent magnets 9 in the radial direction of the motor is slightly smaller than the width of the stator core blocks 314 in the radial direction of the motor. Figure 8 As shown, the housing 1 is provided with a plurality of permanent magnet receiving slots 10 spaced apart along the circumferential direction of the motor. The permanent magnet receiving slots are recessed from the inner side of the housing 1 to the radially outer side. The receiving space of the permanent magnet receiving slots 10 and the corresponding permanent magnets 9 is in the same circumferential direction of the motor.

[0133] A permanent magnet receiving groove 10 is provided on the housing 1 to accommodate the permanent magnet 9, which facilitates the rapid positioning of the permanent magnet 9 and, consequently, the rapid positioning of the stator core block 314 that engages with the permanent magnet 9. This reduces the assembly precision requirements of the permanent magnet 9 and the stator core block 314, and accelerates assembly efficiency. The permanent magnet 9 and the stator core block 314 can be directly assembled with the housing 1. Since both the permanent magnet 9 and the stator core block 314 are directly attached to the housing 1, the roundness of the entire stator 3 can be guaranteed, thereby ensuring uniform air gap in the electrical components.

[0134] like Figure 7As shown, the permanent magnet receiving groove 10 extends through both ends along the axial direction of the motor. The permanent magnet 9 can be pushed into the permanent magnet receiving groove 10 through both axial ends of the housing 1. This is applicable to permanent magnet receiving grooves 10 such as dovetail type that cannot be directly inserted from the radial direction, thus improving the feasibility of assembling the permanent magnet 9 with the housing 1.

[0135] like Figure 7 As shown, the housing 1 is provided with a plurality of positioning parts 11 spaced apart along the circumferential direction of the motor. The plurality of positioning parts 11 are flush with the axial direction of the motor and protrude from the inner side of the housing 1 toward the stator core 31. The positioning parts 11 are used to realize the rapid positioning of the stator core blocks 314 in the axial direction of the motor and to enable the plurality of stator core blocks 314 to be flush with the axial direction of the motor.

[0136] like Figure 8 As shown, the stator core block 314 is a U-shaped structure with its opening facing the radial inward side of the stator. Along the circumferential direction of the motor, the stator core block 314 has a first stator core block unit 315 and a second stator core block unit 316 for forming the two side walls of the U-shaped structure. The width of the first stator core block unit 315 in the circumferential direction of the motor is greater than the width of the second stator core block unit 316 in the circumferential direction of the motor. For two adjacent stator core blocks 314, the first stator core block unit 315 of one stator core block 314 is adjacent to the first stator core block unit 315 of the other stator core block 314; or, the second stator core block unit 316 of one stator core block 314 is adjacent to the second stator core block unit 316 of the other stator core block.

[0137] That is, for two adjacent stator core blocks 314 in the circumferential direction of the motor, the first stator core block unit 315 and the second stator core block unit 316 of the two stator core blocks 314 are located on different sides of the circumferential direction of the stator core block 314, respectively. For example, for two adjacent stator core blocks 314 in the circumferential direction of the motor, the first stator core block unit 315 of one stator core block 314 is located on the left side of the stator core block 314 in the circumferential direction, and the first stator core block unit 315 of the other stator core block 314 is located on the right side of the stator core block 314 in the circumferential direction.

[0138] This design takes into account the slight asymmetry of the magnetic circuit when the armature magnetic field and the permanent magnet magnetic field interact under motor load. On the other hand, it also ensures that operators have a clear reference, making it less likely that the stator core blocks and permanent magnets will be installed in the wrong positions.

[0139] like Figure 10 and Figure 11As shown, the motor in this embodiment also includes a heat transfer element 4. The specific structure and layout of the heat transfer element 4 can be referred to the relevant content in Embodiment 1. The processing and assembly method of the motor in Embodiment 1 is also applicable to this embodiment.

[0140] like Figure 10 As shown, the rotor 2 includes a rotor core 22 and a rotor winding 21. The rotor core 22 includes rotor teeth and rotor slots. The rotor winding 21 is wound around the rotor core 22. In this embodiment, the rotor winding 21 is an armature winding, which can generate electromagnetic torque. The heat-absorbing section 41 extends towards the rotor 2, such that the heat-absorbing end of the heat-absorbing section 41 extends to the radially inner side of the air gap, close to the rotor winding 21, so that the heat transfer element 4 can not only alleviate the local hot spot effect at the end of the stator winding 32, but also alleviate the local hot spot effect at the end of the rotor winding 21. This embodiment also provides a method for processing and assembling an electric motor, used to process the above-mentioned electric motor. The method for processing and assembling an electric motor includes the following steps:

[0141] A permanent magnet receiving groove 10 is provided on the housing 1 to accommodate part of the permanent magnet 9;

[0142] Insert the permanent magnet 9 or a sample of the permanent magnet 9 into the permanent magnet receiving groove 10;

[0143] Insert the stator core block 314 between two adjacent permanent magnets 9 or between two sample blocks of permanent magnets 9 in the circumferential direction of the motor.

[0144] First, the permanent magnet 9 or a sample of the permanent magnet 9 is inserted into the permanent magnet receiving slot 10 to position the permanent magnet 9 relative to the housing 1. Then, the stator core block 314 is inserted between two permanent magnets 9 or sample blocks to position the stator core block 314 relative to the housing 1. This improves the assembly efficiency of the permanent magnet 9 and the stator core block 314 and reduces the assembly precision requirements. Furthermore, since the permanent magnet 9 and the stator core block 314 are assembled directly on the housing 1, they will directly adhere to the housing 1, ensuring the roundness of the entire stator 3 and thus guaranteeing uniform air gap in the electrical components. The sample of the permanent magnet 9 refers to a structural component with the same shape as the permanent magnet 9, typically made of metal, such as stainless steel, which is wear-resistant and has a long service life.

[0145] In this embodiment, before installing the stator core block 314, the sample block of the permanent magnet 9 is inserted into the permanent magnet receiving groove 10. After the stator core block 314 is installed, the permanent magnet 9 is installed to replace the sample block of the permanent magnet 9, so as to prevent wear on the permanent magnet 9 during the assembly of the stator core block 314.

[0146] Before the permanent magnet 9 is inserted into the permanent magnet receiving slot 10, a fixing adhesive is applied to both sides of the permanent magnet 9 along the circumferential direction of the motor. The fixing adhesive can fix the permanent magnet 9 and the stator core block 314 relative to each other, preventing relative movement between the two during use and ensuring the reliability of the motor.

[0147] The following briefly describes the processing and assembly method of the stator-type permanent magnet motor with heat transfer components in this embodiment, based on the processing and assembly methods of the two types of motors mentioned above:

[0148] Step 1: Erect the housing 1, install the sample block of permanent magnet 9 into the permanent magnet receiving groove 10, and fix the sample block of permanent magnet 9 along the radial direction of the motor using appropriate tooling. For example, the sample block of permanent magnet 9 can be held in place by a cylinder with a certain outer diameter.

[0149] Step 2: After applying fixing adhesive to the outer surface of the stator core block 314, install it between two adjacent permanent magnet 9 blocks along the circumferential direction of the motor.

[0150] Step 3: Before the adhesive dries, the stator core block 314 is finely adjusted using a tooling to improve the fit between the first receiving groove 51 on the stator core block 314 and the second receiving groove 52 on the housing 1, ensuring that the heat transfer element 4 can be installed subsequently.

[0151] Step 4: Repeat the above steps to install all the stator core blocks 314 onto the housing 1, and wait for the adhesive on the stator core blocks 314 to solidify.

[0152] Step 5: Extract the sample block of permanent magnet 9 along the motor axis. Apply fixing adhesive to both sides of permanent magnet 9 along the motor axis. Push the permanent magnet 9 with fixing adhesive into the permanent magnet receiving groove 10 along the motor axis and wait for the fixing adhesive on permanent magnet 9 to solidify. The length of permanent magnet 9 in the radial direction of the motor is less than the length of stator core block 314 in the radial direction of the motor to ensure that permanent magnet 9 is not damaged during the subsequent machining of the side of stator 3 near the air gap.

[0153] Step Six: After installing the stator core block 314 and permanent magnet 9, the side of the stator core 31 near the air gap will not be completely round. It is necessary to machine the side of the stator core 31 near the air gap to make it meet the roundness requirements.

[0154] Step 7: After processing, the stator winding 32 is wound onto the stator teeth 311.

[0155] Step 8: Apply fixative to the heat transfer element 4 and push the heat transfer element 4 with fixative applied into the receiving cavity 53 along the axis of the motor to replace the sample block of the heat transfer element 4, and wait for the fixative on the heat transfer element 4 to solidify.

[0156] Step 9: After all installations are completed, since the heat transfer element 4 is not fully attached to the stator core 31 and the housing 1, it is still necessary to perform impregnation and end potting.

[0157] Step 10: Further process the encapsulated stator 3, such as surface polishing, and then assemble the stator 3 with other components.

[0158] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0159] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. An electric motor, comprising a stator and a rotor, the stator comprising a stator core and stator windings, the stator core comprising stator teeth and a stator yoke, characterized in that, The motor further includes a heat transfer element, which has a heat absorption section and a heat dissipation section at both ends along the axial direction of the motor. The heat dissipation section is adjacent to the stator yoke and extends along the axial direction of the motor. The heat absorption section is located outside the stator winding in the axial direction of the motor. One end of the heat absorption section is connected to the heat dissipation section, and the other end of the heat absorption section extends toward the rotor along the radial direction of the motor. The heat absorption end of the heat absorption section is close to the stator winding of the stator. The heat-absorbing section is located near the axial end of the stator and is capable of absorbing heat, while the heat-dissipating section is located near the middle section of the stator and is capable of releasing heat. The heat absorbed by the heat-absorbing section from the axial end of the stator can be transferred to the heat-dissipating section for release through the heat transfer element.

2. The motor as described in claim 1, characterized in that, The stator yoke is provided with a first receiving groove for accommodating the heat transfer element. The first receiving groove extends along the axial direction of the motor, and at least a portion of the heat dissipation section is accommodated within the first receiving groove.

3. The motor as described in claim 2, characterized in that, The stator is an outer stator, and the motor also includes a housing. The inner side of the housing fits against the outer side of the stator yoke, and a second receiving groove is provided on the housing. The first receiving groove is recessed radially inward from the outer side of the stator yoke, and the second receiving groove is recessed radially outward from the inner side of the housing. The first receiving groove and the second receiving groove are located in the same circumferential direction of the motor. The first receiving groove and the corresponding second receiving groove cooperate to form a receiving cavity for accommodating the heat transfer element. Along the axial direction of the motor, the receiving cavity extends through one end near the heat-absorbing section.

4. The motor as described in claim 3, characterized in that, Along the axial direction of the motor, the end of the receiving cavity near the heat dissipation section is closed.

5. The motor as described in claim 2, characterized in that, The first receiving slot and one of the stator teeth are located in the same circumferential direction of the motor.

6. The motor as described in claim 1, characterized in that, The number of stator teeth is multiple, and the multiple stator teeth are spaced apart along the circumferential direction of the motor. Each stator tooth is wound with a stator winding. The heat-absorbing section is disposed between two adjacent stator teeth, and the heat-absorbing section is located on the axial outer side of the stator winding wound on the corresponding stator tooth.

7. The motor as described in claim 1, characterized in that, A heat-absorbing plate is installed on the heat-absorbing section, and the cross-sectional dimension of the heat-absorbing plate is larger than that of the heat-absorbing section.

8. The motor as described in claim 1, characterized in that, The number of heat transfer elements is multiple, and at least one heat transfer element is provided at both ends of the stator along the axial direction; the heat transfer elements at both ends of the stator along the circumferential direction of the motor are staggered.

9. The motor according to any one of claims 1-8, characterized in that, The heat transfer element is a heat pipe.

10. The motor according to any one of claims 1-4 and 6-8, characterized in that, The stator is an outer stator, which also includes multiple permanent magnets. The inner side of the motor housing is attached to the outer side of the stator core. The stator core includes multiple stator core blocks spaced apart along the circumferential direction of the motor. Adjacent stator core blocks form a receiving space for accommodating the permanent magnets. The permanent magnets are engaged with the stator core blocks. The housing is provided with multiple permanent magnet receiving slots spaced apart along the circumferential direction of the motor. The permanent magnet receiving slots are recessed radially outward from the inner side of the housing. The permanent magnet receiving slots and the corresponding receiving spaces for the permanent magnets are located in the same circumferential direction of the motor.

11. The motor as described in claim 10, characterized in that, The stator core block is a U-shaped structure with its opening facing the radial inner side of the stator; along the circumferential direction of the motor, the stator core block has a first stator core block unit and a second stator core block unit for forming the two side walls of the U-shaped structure; the width of the first stator core block unit in the circumferential direction of the motor is greater than the width of the second stator core block unit in the circumferential direction of the motor; For two adjacent stator core blocks, the first stator core block unit of one stator core block is adjacent to the first stator core block unit of the other stator core block; or, the second stator core block unit of one stator core block is adjacent to the second stator core block unit of the other stator core block.

12. The motor as described in claim 10, characterized in that, The rotor includes a rotor core and a rotor winding. The rotor core includes rotor teeth and rotor slots, and the rotor winding is an armature winding.

13. A method for processing and assembling an electric motor, the motor comprising a housing and a stator, wherein the stator is an outer stator, characterized in that, The motor processing and assembly method is used for the motor as described in any one of claims 1-12, and the motor processing and assembly method includes the following steps: The stator core and permanent magnet of the stator are installed in the housing, and the first receiving groove on the stator is aligned with the second receiving groove on the housing to form a receiving cavity for accommodating the heat transfer element; The stator windings of the stator are installed on the stator core; The heat transfer element is placed inside the receiving cavity.

14. The method for processing and assembling an electric motor as described in claim 13, characterized in that, During the alignment of the first and second receiving grooves, a sample of the heat transfer element is inserted into the receiving cavity; If the sample block of the heat transfer element can be inserted into the receiving cavity, then it is determined that the first receiving groove and the second receiving groove are aligned; If the sample block of the heat transfer element cannot be inserted into the receiving cavity, it is determined that the first receiving groove and the second receiving groove are not aligned, and the position of the stator core needs to be adjusted.

15. The method for processing and assembling an electric motor as described in claim 14, characterized in that, After the first and second receiving slots are aligned, the sample block that replaces the heat transfer element is installed.

16. The method for processing and assembling an electric motor as described in claim 13, characterized in that, After placing the heat transfer element inside the housing, the housing, the stator, and the heat transfer element are potted.

17. A method for processing and assembling an electric motor, the motor comprising a housing and a stator, wherein the stator is an outer stator, characterized in that, The motor processing and assembly method is used for the motor as described in any one of claims 10-12, and the motor processing and assembly method includes the following steps: A permanent magnet receiving groove is provided on the housing to accommodate a portion of the permanent magnets; Insert the permanent magnet or a sample of the permanent magnet into the permanent magnet receiving slot; The stator core is divided into blocks and inserted between two adjacent permanent magnets or between permanent magnet samples in the circumferential direction of the motor.

18. The method for processing and assembling an electric motor as described in claim 17, characterized in that, If a sample block of a permanent magnet is inserted into the permanent magnet receiving slot, then after the stator core is installed in sections, the permanent magnet is installed to replace the sample block of the permanent magnet.

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