Stepped insulating end plate for separating passing line and motor

Abstract

The utility model relates to the technical field of motors, and discloses a stepped insulating end plate for separating passing wires and a motor. The stepped insulating end plate comprises winding teeth which are uniformly distributed on the outer circumference of the insulating end plate; the first step and the second step are arranged on the surface of the inner circle and used for being in lap joint with passing wires of all phases; the inner circumference of the stepped insulating end plate is also provided with an end plate hook; the motor comprises an end cover, a casing, a stepped shaft, a sealing structure, a stator and a rolling bearing, and a stepped insulating end plate is arranged in the stator. By adopting the step-type insulation end plate provided by the utility model and combining with a motor winding mode, steps with different heights are arranged between passing wires of each phase to separate the passing wires between phases, so that an inter-phase insulation effect is achieved; according to the motor adopting the step-type insulation end plate, the stator of the motor comprises the step-type insulation end plate, so that the effect of prolonging the service life of the motor is finally achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and more specifically, to a stepped insulating end plate for separating wires and a motor. Background Art

[0002] The insulating end plate is the main component for insulating the motor enameled wire and the stator core. When winding the stator core, the wires need to be overlapped. In the hub motor (two-wheel electric vehicle motor) or larger outer rotor permanent magnet motor (aquaculture aerator), insulating end plates are generally used at the wire crossing to insulate the stator core and the enameled wire.

[0003] The motors in the prior art usually adopt an insulating end plate with a flat structure. For example, CN219304549U discloses an insulating plate. However, the insulating end plate mentioned above is a flat structure and only serves to insulate the stator core and the enameled wire. When such a flat end plate is used for stator phase-to-phase wire crossing, two phases will overlap each other. Under long-term operation conditions of the motor, it is very easy for phase-to-phase short circuit or wire burning to occur, resulting in the motor being unable to operate normally. When the phase-to-phase insulation treatment of the wire is not performed, it is very easy for the wire to short-circuit, burn out, break the wire and other accidents to occur, ultimately leading to motor output failure. Utility Model Content

[0004] The utility model provides a stepped insulating end plate for separating the wires in order to overcome the defects of the prior art that the wires overlap each other during winding of the stator core, which is prone to short circuit, burning and breaking of the wires.

[0005] Another object of the present invention is to provide a motor.

[0006] In order to solve the above technical problems, the technical solution of the utility model is as follows:

[0007] A stepped insulating end plate for separating wires, comprising winding teeth evenly distributed on the outer circumference of the insulating end plate; and also comprising a first step and a second step arranged on the inner circumference surface for overlapping the wires of each phase;

[0008] An end plate hook is also provided on the inner circumference of the stepped insulating end plate.

[0009] Furthermore, the winding teeth are provided with a limiting hook to prevent the winding wire from escaping from the winding teeth.

[0010] By adopting the above technical solution, a limiting hook is provided on the winding tooth so that the wire can be limited and clamped by the limiting hook during the winding process, thereby preventing the wire from falling off the winding tooth and ensuring the stable winding of the coil.

[0011] Furthermore, the height of the first step is lower than that of the second step.

[0012] Further, the angular spacing of the first steps is 7°; the stepped insulating end plate includes a combination of 9 first steps and 9 second steps, and also includes 1 first step and 1 second step separately arranged, and the angular spacing of the separately arranged first step and second step is 67°;

[0013] The combination of the first step and the second step is arranged along the inner circumferential surface of the stepped insulating end plate, and the angular intervals between two adjacent combinations are 29° and 31°.

[0014] The first step and the second step are for phase windings in a three-phase motor. For example, the first step separates the B-phase windings, and the second step is used to separate the A-phase windings.

[0015] A motor comprises an end cover and a casing, a stepped shaft, a sealing structure sleeved on the circumference of the stepped shaft, a stator and a rolling bearing; the stator is provided with the stepped insulating end plate.

[0016] Furthermore, the stator comprises a stator core, a winding support sleeve and the stepped insulating end plate for separating the wires; the winding support sleeve is sleeved on the circumference of the stepped shaft;

[0017] The stator further comprises a winding stator support sleeved on the circumference of the winding support sleeve; the stepped insulating end plate and the stator core are connected to the winding stator support via a winding group;

[0018] The stepped insulating end plate is connected to the winding stator support through the end plate hook.

[0019] By adopting the above technical solutions, the stepped insulating end plate used to separate the wires provides good insulation protection to prevent short circuits and arcing between winding groups. The close connection between the stepped insulating end plate and the winding stator bracket ensures the safe operation of the stator and reduces the risk of electrical failure during motor operation; the structural design of the winding bracket sleeve and the winding stator bracket enhances the mechanical strength of the stator and can withstand greater mechanical stress and vibration. This is particularly important for the operation of the motor under high load and complex working conditions, ensuring the stability and reliability of the equipment; the reasonable layout and close fit between the various components of the stator help optimize the heat dissipation effect. The gap design between the winding bracket sleeve and the winding stator bracket is conducive to air flow and heat dissipation, reduces the temperature rise of the stator during operation, and improves the durability and service life of the motor.

[0020] Furthermore, a keyway and a key are provided on the stepped shaft to prevent relative movement between the winding bracket sleeve and the stepped shaft.

[0021] By adopting the above technical solution, a keyway and a key are provided on the stepped shaft to prevent relative movement between the winding bracket sleeve and the stepped shaft. Through the cooperation of the keyway and the key, the torque transmission capacity between the stepped shaft and the winding bracket sleeve can be greatly improved, and no slippage occurs when transmitting torque, thereby ensuring the operating stability and reliability of the equipment.

[0022] At the same time, through the close fit of the key and the keyway, a rigid connection is formed between the winding bracket sleeve and the stepped shaft. This overall rigid connection method can improve the equipment's anti-deformation ability and ensure that the equipment maintains a good working condition during operation.

[0023] The key and keyway connection method has strong impact resistance and can effectively absorb and alleviate the impact of external impact on the equipment. During the operation of the equipment, especially when starting or stopping, it can reduce the damage to the components caused by the impact load and extend the service life of the equipment.

[0024] Furthermore, the sealing structure includes a skeleton oil seal, a mechanical seal cover plate, a mechanical seal dynamic ring, a mechanical seal static ring, and an elastic retaining ring sleeved on the stepped shaft; the sealing structure also includes an O-ring sleeved on the end cover to fit tightly.

[0025] By adopting the above technical solutions, the skeleton oil seal can perform dust-proof sealing during the operation of the motor; and the sealing combination of the mechanical seal cover plate, the mechanical seal dynamic ring, and the mechanical seal static ring can complete the sealing of the cooling oil inside the motor to avoid leakage of the internal cooling oil during the operation of the motor;

[0026] The elastic retaining ring mounted on the stepped shaft can fix the components on the stepped shaft in the shaft or hole to prevent axial movement of other components. At the same time, it can ensure that the components remain in the correct position when subjected to axial force. The design of the elastic retaining ring enables the sealing structure to adapt to the slight displacement and vibration of the shaft, avoiding sealing failure due to fatigue, thereby improving the durability of the overall system.

[0027] The O-ring between the end cover and the housing serves to isolate external liquid from entering the motor, avoiding damage to the internal motor or motor short circuit due to liquid infiltration.

[0028] In general, the sealing structure of this technical solution reduces the leakage and waste of the working medium by designing an effective seal, thereby reducing resource consumption and environmental pollution. In the long run, it reduces the maintenance and replacement frequency of the equipment, thereby saving costs and having good economic efficiency.

[0029] Furthermore, the stepped shaft is provided with boring holes on its circumference and inside, the wire windings on the stator pass through the boring holes and penetrate the inside of the stepped shaft, and the cables are led out from the end of the stepped shaft.

[0030] By adopting the above technical solutions, the design of the stepped shaft allows the wire winding to cleverly pass through the boring inside the shaft, which greatly reduces the external space occupied. Compared with the traditional wiring method, this internal wiring method makes the entire device more compact, which is conducive to the miniaturization design of the equipment; the wire winding is routed through the internal boring hole, which can effectively avoid interference from the external environment and mechanical damage. For example, during operation, external wiring is susceptible to physical damage such as friction and collision, while internal wiring greatly reduces these risks, thereby improving the safety and reliability of the motor; the cable is led out from the end of the stepped shaft, which reduces the number of external connection points and the complexity of wiring, which can reduce electromagnetic interference between wire windings, ensure the stability and efficiency of current transmission, and reduce the clutter of exposed cables.

[0031] Furthermore, the winding stator bracket is provided in two pieces, and the two winding stator brackets are respectively provided with bosses and grooves that are matched and connected with each other.

[0032] Compared with the prior art, the beneficial effects of the technical solution of the utility model are:

[0033] A stepped insulating end plate and a motor for separating over-wires. The stepped insulating end plate includes winding teeth evenly distributed on the outer circumference of the insulating end plate; it also includes a first step and a second step arranged on the inner circumference surface for overlapping the over-wires of each phase; an end plate hook is also arranged on the inner circumference of the stepped insulating end plate; the motor includes an end cover and a housing, including a stepped shaft and a sealing structure sleeved on the circumference of the stepped shaft, a stator and a rolling bearing; the stator is provided with a stepped insulating end plate.

[0034] By adopting the stepped insulating end plate of the utility model and combining it with the motor winding method, steps of different heights are provided between each phase wire to separate the phase wires, thereby achieving the phase-to-phase insulation effect; the motor adopts the stepped insulating end plate, and the stator of the motor includes the stepped insulating end plate, ultimately achieving the effect of extending the service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the internal structure of the motor according to an embodiment of the utility model;

[0036] Figure 2 This is a schematic diagram of the stator structure of the motor according to the embodiment of the utility model;

[0037] Figure 3 This is a schematic structural diagram of a stepped insulating end plate for separating wires according to an embodiment of the utility model;

[0038] Figure 4 It is a side view of a stepped insulating end plate for separating the wires according to an embodiment of the utility model;

[0039] Figure 5 Schematic diagram of winding implementation of the step-type insulating end plate for separating the passing wires according to the embodiment of the utility model; wherein: 1, step-type insulating end plate; 101, winding teeth; 102, first step; 103, second step; 104, end plate hook;

[0040] 2. Step shaft; 3. Sealing structure; 301. Skeleton oil seal; 302. Mechanical seal cover plate; 303. Mechanical seal dynamic ring; 304. Mechanical seal static ring; 305. Elastic retaining ring; 306. O-ring;

[0041] 4. stator; 401. stator core; 402. winding bracket sleeve; 403. winding stator bracket. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the present application will be clearly and completely described below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the described embodiments, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. "First", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0044] Example 1

[0045] like Figure 1-5 As shown, this embodiment discloses a stepped insulating end plate 1 for separating the passing wires, including winding teeth 101 evenly distributed on the outer circumference of the stepped insulating end plate 1; also including a first step 102 and a second step 103 arranged on the inner circular surface for overlapping the passing wires of each phase; an end plate hook 104 is also provided on the inner circumference of the stepped insulating end plate 1.

[0046] The winding tooth 101 is provided with a limiting hook 1011 to prevent the winding wire from escaping from the winding tooth 101 .

[0047] The limiting hooks are arranged on the winding teeth so that the wire can be limited and clamped by the limiting hooks during the winding process, thereby preventing the wire from falling off the winding teeth and ensuring the stable winding of the coil.

[0048] The first step 102 is lower in height than the second step 103 .

[0049] The angular spacing of the first steps 102 is 7°;

[0050] The stepped insulating end plate 1 includes a combination of 9 first steps 102 and 9 second steps 103, and also includes a first step 102 and a second step 103 that are individually arranged, and the angular spacing between the individually arranged first step 102 and the second step 103 is 67°;

[0051] The combination of the first step 102 and the second step 103 is arranged along the inner circumferential surface of the stepped insulating end plate 1, and the angular intervals between two adjacent combinations are 29° and 31°.

[0052] The first step 102 and the second step 103 are defined for the power winding in the three-phase motor. For example, tooth No. 1 is the end of the A-phase winding, tooth No. 4 is the end of the B-phase winding, and tooth No. 7 is the end of the C-phase winding. After each phase of the power winding is wound around three winding teeth 101, the wire overlap processing begins. For example, the first step 102 is used to separate the B-phase wire, the second step 103 is used to separate the A-phase wire, and the C-phase winding does not pass through the first step 102 and the second step 103. The winding method of the three-phase motor can achieve steps of different heights between each phase wire to separate the phase wires, thereby achieving the phase-to-phase insulation effect, while improving the motor production qualification rate and motor life.

[0053] Take the stepped insulating end plate 1 with 54 teeth as an example: the winding starts from tooth No. 51 at the Y end and passes through teeth No. 50 and No. 49 in a counterclockwise direction, then the wire is overlapped to the first step 102 and wound to tooth No. 42, and so on, and finally wound to the B end for leading out; the winding starts from tooth No. 48 at the X end and passes through teeth No. 47 and No. 46 in a counterclockwise direction, then the wire is overlapped to the second step 103 and wound to tooth No. 39, and so on, and finally wound to the A end for leading out.

[0054] The number of teeth of the winding teeth 101 of the stepped insulating end plate 1 can be changed according to the actual motor size and actual needs. The corresponding angular spacing of the first step and the adjacent steps can also be changed according to the actual winding conditions of the motor wires. The above-mentioned motors include but are not limited to hub motors and large outer rotor permanent magnet motors, such as: unicycle balance car motors, scooter drive motors, large industrial ceiling fan motors, air compressors, external rotor blowers, large water pumps, sweeping cleaning robots, two-wheeled electric vehicle motors and fishery aeration aerators, etc.

[0055] Example 2

[0056] like Figure 1-5 As shown, this embodiment provides a motor, including an end cover and a housing, including a stepped shaft 2, and also including a sealing structure 3, a stator 4 and a rolling bearing 5 sleeved on the circumference of the stepped shaft 2; a stepped insulating end plate 1 is provided in the stator 4.

[0057] A stepped insulating end plate 1 for separating wires includes winding teeth 101 evenly distributed on the outer circumference of the stepped insulating end plate 1; a first step 102 and a second step 103 are arranged on the inner circumference surface for overlapping the wires of each phase; an end plate hook 104 is also arranged on the inner circumference of the stepped insulating end plate 1.

[0058] The winding tooth 101 is provided with a limiting hook 1011 to prevent the winding wire from escaping from the winding tooth 101 .

[0059] The first step 102 is lower in height than the second step 103 .

[0060] The angular spacing of the first steps 102 is 7°;

[0061] The stepped insulating end plate 1 includes a combination of 9 first steps 102 and 9 second steps 103, and also includes a first step 102 and a second step 103 that are individually arranged, and the angular spacing between the individually arranged first step 102 and the second step 103 is 67°;

[0062] The combination of the first step 102 and the second step 103 is arranged along the inner circumferential surface of the stepped insulating end plate 1, and the angular intervals between two adjacent combinations are 29° and 31°.

[0063] As another alternative, the stepped insulating end plate 1 may also be configured as a combination of 12 first steps 102 and second steps 103 equally divided by 30°, which can also achieve the purpose of separating the three-phase line crossings.

[0064] The stator 4 includes a stator core 401, a winding support sleeve 402 and a stepped insulating end plate 1 for separating the wires; the winding support sleeve 402 is sleeved on the circumference of the stepped shaft 2; the stator 4 also includes a winding stator support 403 sleeved on the circumference of the winding support sleeve 402; the stepped insulating end plate 1 and the stator core 401 are connected to the winding stator support 403 through a winding group; the stepped insulating end plate 1 is connected to the winding stator support 403 through an end plate hook 104.

[0065] The stepped insulating end plate 1 provides good insulation protection to prevent short circuits and arcing between winding groups. The close connection between the stepped insulating end plate 1 and the winding stator bracket 403 ensures the safe operation of the stator and reduces the risk of electrical failure during motor operation; the structural design of the winding bracket sleeve 402 and the winding stator bracket 403 enhances the mechanical strength of the stator 4 and can withstand greater mechanical stress and vibration. This is particularly important for the operation of the motor under high load and complex working conditions, ensuring the stability and reliability of the equipment; the reasonable layout and close fit between the various components of the stator 4 help optimize the heat dissipation effect. The gap design between the winding bracket sleeve 402 and the winding stator bracket 403 is conducive to air flow and heat dissipation, reduces the temperature rise of the stator 4 during operation, and improves the durability and service life of the motor.

[0066] A keyway and a key are provided on the stepped shaft 2 to prevent relative movement between the winding bracket sleeve 402 and the stepped shaft 2 .

[0067] A keyway and a key are provided on the stepped shaft 2 to prevent relative movement between the winding bracket sleeve 402 and the stepped shaft 2. Through the cooperation of the keyway and the key, the torque transmission capacity between the stepped shaft 2 and the winding bracket sleeve 402 can be greatly improved, and no slippage occurs when transmitting torque, thereby ensuring the operating stability and reliability of the equipment.

[0068] At the same time, through the close fit of the key and the keyway, a rigid connection is formed between the winding bracket sleeve 402 and the stepped shaft 2. This integral rigid connection can improve the deformation resistance of the equipment, ensure that the equipment maintains a good working condition during operation, and has strong impact resistance while being able to effectively absorb and alleviate the impact of external impact on the equipment. During the operation of the equipment, especially when starting or stopping, it can reduce the damage to the components caused by the impact load and extend the service life of the equipment.

[0069] During the electrical performance test of the motor of Example 2, when the output torque of the fixed motor is 70 N·m and the input voltage is 380 V AC, the staff adjusted the parameters of the motor speed and input current and obtained the following rules:

[0070] When the motor speed is 100-210r / min and the input current is 1.89-3.31A, the motor efficiency interval is 77.2%-85.3%. It can be seen that within the above parameter range, the relationship between the motor speed and the input current and the motor efficiency is positively correlated. Among them, when the motor speed is 210r / min and the input current is 3.31A, the motor efficiency is 85.3% (the motor efficiency is the percentage of electrical energy input power converted into mechanical output power. The larger the value, the higher the conversion efficiency and the smaller the loss).

[0071] Example 3

[0072] like Figure 1-5 As shown, this embodiment provides a motor, and the technical solution is similar to that of embodiment 2, except that:

[0073] The sealing structure 3 includes a skeleton oil seal 301, a mechanical seal cover plate 302, a mechanical seal dynamic ring 303, a mechanical seal static ring 304 and an elastic retaining ring 305 sleeved on the stepped shaft; the sealing structure 3 also includes an O-ring 306 sleeved on the end cover to fit tightly.

[0074] The skeleton oil seal 301 can perform dust-proof sealing during the operation of the motor; and the sealing combination of the mechanical seal cover plate 302, the mechanical seal dynamic ring 303 and the mechanical seal static ring 304 can complete the sealing of the cooling oil inside the motor to avoid leakage of the internal cooling oil during the operation of the motor;

[0075] The elastic retaining ring 305 sleeved on the stepped shaft 2 can fix the components on the stepped shaft 2 in the shaft or hole to prevent other components from axial movement. At the same time, it can also ensure that the components remain in the correct position when subjected to axial force; the design of the elastic retaining ring 305 enables the sealing structure 3 to adapt to the slight displacement and vibration of the shaft, avoiding sealing failure due to fatigue, thereby improving the durability of the overall system.

[0076] The O-ring 306 between the end cover and the housing serves to isolate external liquid from entering the motor, thereby preventing the internal motor from being damaged or short-circuited due to liquid infiltration.

[0077] The stepped shaft 2 is provided with boring holes on its circumference and inside. The wire windings on the stator 4 pass through the inside of the stepped shaft 2 through the boring holes, and the cables are led out from the end of the stepped shaft 2 .

[0078] There are two winding stator brackets 403 , and the two winding stator brackets 403 are respectively provided with bosses and grooves that cooperate and connect with each other.

[0079] The boring design of the stepped shaft 2 enables the wire winding to cleverly pass through the inside of the stepped shaft 2, which greatly reduces the occupation of the external space. Compared with the traditional wiring method, this internal wiring method makes the entire device more compact and is conducive to the miniaturization design of the equipment; the wire winding is routed through the internal boring hole, which can effectively avoid interference from the external environment and mechanical damage. For example, during operation, the external wiring is susceptible to physical damage such as friction and collision, while the internal wiring greatly reduces these risks, thereby improving the safety and reliability of the motor; the cable is led out from the end of the stepped shaft 2, which reduces the number of external connection points and the complexity of wiring, which can reduce the electromagnetic interference between the wire windings, ensure the stability and efficiency of current transmission, and reduce the clutter of exposed cables.

[0080] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A stepped insulating end plate for separating wires, characterized in that: It comprises winding teeth (101) evenly distributed on the outer circumference of the stepped insulating end plate (1); and also comprises a first step (102) and a second step (103) arranged on the inner circumference surface for overlapping the wires of each phase; An end plate hook (104) is also provided on the inner circumference of the stepped insulating end plate (1).

2. The stepped insulating end plate for separating the wires according to claim 1, characterized in that: The winding tooth (101) is provided with a limiting hook (1011) for preventing the winding wire from escaping from the winding tooth (101).

3. The stepped insulating end plate for separating the wires according to claim 1, characterized in that: The height of the first step (102) is lower than that of the second step (103).

4. The stepped insulating end plate for separating the wires according to claim 1, characterized in that: The angular spacing of the first steps (102) is 7°; The stepped insulating end plate (1) comprises a combination of nine first steps (102) and nine second steps (103), and also comprises one first step (102) and one second step (103) which are separately arranged, wherein the angular spacing between the separately arranged first step (102) and the second step (103) is 67°; The combination of the first step (102) and the second step (103) is arranged along the inner circumferential surface of the stepped insulating end plate (1), and the angular spacing between two adjacent combinations is 29° and 31°.

5. A motor, comprising an end cover and a housing, characterized in that: It comprises a stepped shaft (2), and also comprises a sealing structure (3), a stator (4) and a rolling bearing (5) which are sleeved on the circumference of the stepped shaft (2); The stator (4) is provided with a stepped insulating end plate (1) according to any one of claims 1 to 4.

6. The motor according to claim 5, characterized in that The stator (4) comprises a stator core (401), a winding support sleeve (402) and the stepped insulating end plate (1); the winding support sleeve (402) is sleeved on the circumference of the stepped shaft (2); The stator (4) further comprises a winding stator support (403) sleeved on the circumference of the winding support shaft sleeve (402); the stepped insulating end plate (1) and the stator core (401) are connected to the winding stator support (403) via a winding group; The stepped insulating end plate (1) is connected to the winding stator support (403) via the end plate hook (104).

7. The motor according to claim 6, characterized in that The stepped shaft (2) is provided with a keyway and a key to prevent relative movement between the winding support sleeve (402) and the stepped shaft (2).

8. The motor according to claim 5, characterized in that The sealing structure (3) comprises a skeleton oil seal (301), a mechanical sealing cover plate (302), a mechanical sealing dynamic ring (303), a mechanical sealing static ring (304), and an elastic retaining ring (305) sleeved on the stepped shaft; the sealing structure (3) also comprises an O-ring (306) sleeved on the end cover to fit tightly.

9. The motor according to claim 5, characterized in that The stepped shaft (2) is provided with boring holes on its circumference and inside, the wire winding on the stator (4) passes through the boring holes and through the inside of the stepped shaft (2), and the cable is led out from the end of the stepped shaft (2).

10. The motor according to claim 6, characterized in that The winding stator brackets (403) are arranged in two numbers, and the two winding stator brackets (403) are respectively provided with bosses and grooves that are matched and connected to each other.

Images