Inner rotor speed reduction hub motor for wheelchair and wheelchair

Abstract

The utility model provides an inner rotor speed reduction hub motor for a wheelchair and the wheelchair, and the inner rotor speed reduction hub motor comprises an electromagnetic brake assembly, a hub assembly, a stator sheath assembly, a rotor assembly, a stator assembly, a planetary support assembly and an end cover assembly, the electromagnetic brake assembly and the end cover assembly are installed at openings in the two ends of the hub assembly respectively, the rotor assembly and the stator assembly are installed in the stator sheath assembly in a sealed mode, the stator sheath assembly is installed in the hub assembly in a sealed mode, and the stator sheath assembly is connected with the planet support assembly. The rotor assembly and the stator assembly are matched and are in transmission connection with the planetary support assembly, and the planetary support assembly is in transmission connection with the end cover assembly. According to the utility model, an inner rotor type structure is matched with a duplex-tooth planetary speed reduction structure, so that the comfort can be ensured, and the internal space can be effectively utilized to improve the power density; by integrating the direct-current brushless motor and the planetary speed reducing mechanism, the weight can be reduced, and the torque can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hub motors, and in particular to an inner rotor reduction hub motor for a wheelchair and the wheelchair. Background Art

[0002] With the progress of society and the development of science and technology, the attention and demand for people with limited mobility are increasing. Traditional wheelchairs have problems such as inconvenience in use and high physical exertion, while the emergence of electric wheelchairs provides solutions to these problems and can significantly improve the quality of life and autonomy of people with limited mobility.

[0003] The existing Chinese patent with publication number CN110198101A discloses a wheelchair motor, including a motor shaft, a first end cover, a second end cover, a wheel hub, a stator group, a magnetic steel and a brake unit, wherein the brake unit includes a connecting seat, a moving plate, a stator plate, a friction plate, a resistance spring, a magnetic brake seat, a temperature sensor for monitoring the internal temperature of the motor and a Hall element for monitoring the distance between the moving plate and the magnetic brake seat and the rotation speed of the friction plate during braking. A polygonal boss ring is provided at one end of the connecting seat; the friction plate is inserted into the polygonal boss ring and is located between the moving and stator plates. The stator plate is connected to one axial end of the magnetic brake seat with an axial spacing L. The temperature sensor and the Hall element are respectively arranged on the silicon steel plate turns of the stator group and on the magnetic brake seat.

[0004] At present, most electric wheelchairs on the market use direct drive motors. The wheelchair motors on the market have the following characteristics:

[0005] 1. Direct drive hub motor is used. In order to obtain greater torque, the motor is large and heavy;

[0006] 2. The outer rotor motor structure combined with a conventional reduction mechanism can also produce good torque.

[0007] Therefore, the inventors believe that it is necessary to provide an inner rotor reduction hub motor for a wheelchair, which, under the weight limitation of the electric wheelchair, can achieve the goals of smaller size, lighter weight, greater torque and higher efficiency compared to traditional direct drive motors. Utility Model Content

[0008] In view of the defects in the prior art, the purpose of the utility model is to provide an inner rotor reduction hub motor for a wheelchair and a wheelchair.

[0009] According to the utility model, an inner rotor reduction hub motor for a wheelchair comprises: an electromagnetic brake assembly, a hub assembly, a stator sleeve assembly, a rotor assembly, a stator assembly, a planetary bracket assembly and an end cover assembly. A cavity is formed inside the hub assembly. The electromagnetic brake assembly and the end cover assembly are respectively mounted at the two end openings of the hub assembly. The rotor assembly and the stator assembly are sealed and mounted inside the stator sleeve assembly. The stator sleeve assembly is sealed and mounted inside the hub assembly. The stator sleeve assembly is connected to the planetary bracket assembly. The rotor assembly and the stator assembly cooperate to be transmission-connected to the planetary bracket assembly. The planetary bracket assembly is transmission-connected to the end cover assembly.

[0010] Preferably, the planetary bracket assembly includes: a central gear, a planetary bracket, a duplex planetary gear, a second deep groove ball bearing, a planetary bracket pin, a thrust bearing, a third deep groove ball bearing, a planetary retainer, and a first gasket. The planetary retainer is fixed to the planetary bracket, and the planetary bracket is connected to the central gear through the third deep groove ball bearing. The inner and outer diameters of the third deep groove ball bearing are both interference fit. The duplex planetary gear is connected to the planetary bracket pin through the second deep groove ball bearing. The large gear of the duplex planetary gear is meshed with the central gear, and the small gear of the duplex planetary gear is meshed with the first inner gear ring of the end cover assembly. The central gear is transmission connected to the first inner gear ring through the duplex planetary gear.

[0011] Preferably, the stator sheath assembly comprises: an outlet shaft, a stator sheath and a skeleton oil seal, the outlet shaft is connected to the stator sheath, the outer diameter of the skeleton oil seal is interference fit with the outlet shaft, the lip of the skeleton oil seal is interference fit with the central gear, and the skeleton oil seal and the central gear can rotate relative to each other;

[0012] A fourth deep groove ball bearing is arranged between the stator sleeve and the central gear. The inner diameter of the stator sleeve is interference fit with the fourth deep groove ball bearing, and there is a gap between the inner diameter of the fourth deep groove ball bearing and the central gear.

[0013] Preferably, the wheel hub assembly includes a wheel hub and a first deep groove ball bearing, the wheel hub is connected to the wire outlet shaft via the first deep groove ball bearing, the wheel hub and the wire outlet shaft are capable of rotating relative to each other, the outer diameter of the first deep groove ball bearing is interference fit with the wheel hub, and an O-ring is provided between the inner diameter of the first deep groove ball bearing and the wire outlet shaft.

[0014] Preferably, the rotor assembly includes a rotor core and magnets, the magnets are attached to the rotor core in pairs, the rotor assembly is radially connected to the center gear via a key, there is a gap between the inner diameter of the rotor core and the center gear, and the rotor assembly and the planetary bracket are separated by a second insulating paper.

[0015] Preferably, the stator assembly includes a first insulating paper, a stator core, a winding, an insulating bracket, a PCBA board and an insulating shield, the first insulating paper and the insulating bracket are installed on the stator core, the first insulating paper and the insulating bracket cooperate to isolate the winding from the stator core, the PCBA board is installed on the insulating shield by snap-fitting, and the insulating shield is installed on the insulating bracket.

[0016] Preferably, the end cover assembly comprises a first inner gear ring, an end cover bearing and an end cover, the outer diameter of the first inner gear ring is interference fit with the end cover, the end cover is tightly connected to the wheel hub, and the joint surface between the end cover and the wheel hub is sealed by an end cover O-ring;

[0017] The end cover is connected to the planetary holder through the end cover bearing. The end cover and the planetary holder can rotate relatively. The outer diameter of the end cover bearing is interference fit with the end cover, and there is a gap between the inner diameter of the end cover bearing and the planetary holder.

[0018] Preferably, the electromagnetic brake assembly includes an electromagnetic brake and a connecting flange, the electromagnetic brake is connected to the wheel hub assembly via the connecting flange, the motor is mounted on the frame via the connecting flange, and the electromagnetic brake can brake the central gear.

[0019] Preferably, an external controller is also included, and the external controller is electrically connected to the stator assembly through a waterproof line.

[0020] A wheelchair provided by the utility model adopts the inner rotor reduction hub motor for wheelchairs.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] 1. The utility model integrates the electromagnetic brake assembly, the wheel hub assembly, the stator sleeve assembly, the rotor assembly, the stator assembly, the planetary bracket assembly and the end cover assembly into one, which is convenient for installation, saves space and is more beautiful; the central gear is braked by the electromagnetic brake, which can achieve small torque braking and save electricity; a double-layer waterproof structure is adopted, one layer uses a waterproof bearing plus an O-ring, and the other layer uses an oil seal; by adopting an inner rotor structure, it is quiet and comfortable, and has good controllability; by adopting a double-linked planetary reduction mechanism, a higher reduction ratio can obtain a large torque while ensuring a higher efficiency.

[0023] 2. The utility model adopts an inner rotor structure arrangement with a double-tooth planetary reduction structure, which can not only ensure comfort but also effectively utilize the internal space to improve power density, bringing a better experience; by integrating the DC brushless motor with the planetary reduction mechanism, the purpose of reducing weight and increasing torque is achieved; by installing an integrated inner rotor reduction hub motor for wheelchairs inside the wheelchair, the motor is easy to disassemble and assemble, which can reduce the overall weight of the wheelchair motor, increase the maximum torque and power density, and has reliable waterproof performance, which helps to improve overall comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0025] Figure 1 This is a cross-sectional view of an inner rotor reduction hub motor for a wheelchair, which is mainly embodied in the utility model;

[0026] Figure 2 This is an exploded view of the inner rotor reduction hub motor used for a wheelchair, which is mainly embodied in the utility model;

[0027] Figure 3 This is an exploded view of the electromagnetic brake assembly mainly embodied in the utility model;

[0028] Figure 4 This is an exploded view of the hub assembly that is mainly embodied in the utility model;

[0029] Figure 5 This is an exploded view of the stator sleeve assembly, the rotor assembly, the stator assembly and the planetary bracket assembly of the utility model;

[0030] Figure 6 This is an exploded view of the end cover assembly mainly embodied in the present utility model.

[0031] Reference numerals:

[0032] Electromagnetic brake assembly 1 Hub assembly 2 Stator sleeve assembly 3

[0033] Rotor assembly 4 Stator assembly 5 Planetary bracket assembly 6

[0034] End cover assembly 7 Electromagnetic brake 8 First screw 9

[0035] Connecting flange 10 Wheel hub 11 First deep groove ball bearing 12

[0036] O-ring 13 outlet shaft 14 stator sleeve 15

[0037] Second screw 16 Framework oil seal 17 PCBA board 18

[0038] Insulation shield 19 Stator core 20 Insulation bracket 21

[0039] Winding 22 Central gear 23 Rotor core 24

[0040] Magnetic steel 25 Third screw 26 First insulating paper 27

[0041] Planet carrier 28 Fourth screw 29 Planet holder 30

[0042] Double planetary gear 31 Second deep groove ball bearing 32 Planetary bracket pin 33

[0043] Thrust bearing 34 Second insulating paper 35 First gasket 36

[0044] Third deep groove ball bearing 37 key 38 second gasket 39

[0045] Fourth deep groove ball bearing 40 First inner gear ring 41 End cover bearing 42

[0046] End cover O-ring 43 End cover 44 Fifth screw 45

[0047] Waterproof line 46 DETAILED DESCRIPTION

[0048] The utility model is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be pointed out that for those of ordinary skill in the art, several changes and improvements can be made without departing from the concept of the utility model. These all belong to the protection scope of the utility model.

[0049] like Figure 1-6 As shown, according to the utility model, an inner rotor reduction hub motor for a wheelchair comprises: an electromagnetic brake assembly 1, a hub assembly 2, a stator sleeve assembly 3, a rotor assembly 4, a stator assembly 5, a planetary bracket assembly 6 and an end cover assembly 7. A cavity is formed inside the hub assembly 2. The electromagnetic brake assembly 1 and the end cover assembly 7 are respectively mounted at the openings at both ends of the hub assembly 2. The rotor assembly 4 and the stator assembly 5 are sealed and mounted inside the stator sleeve assembly 3. The stator sleeve assembly 3 is sealed and mounted inside the hub assembly 2. The stator sleeve assembly 3 is connected to the planetary bracket assembly 6. The rotor assembly 4 and the stator assembly 5 cooperate to be transmission-connected to the planetary bracket assembly 6. The planetary bracket assembly 6 is transmission-connected to the end cover assembly 7.

[0050] The planetary support assembly 6 includes: a central gear 23, a planetary support 28, a double planetary gear 31, a second deep groove ball bearing 32, a planetary support pin 33, a thrust bearing 34, a third deep groove ball bearing 37, a planetary retainer 30, a first gasket 36, and a second insulating paper 35. The planetary support 28 is connected to the central gear 23 through the third deep groove ball bearing 37 to ensure relative rotation. The inner and outer diameters of the third deep groove ball bearing 37 are both interference fit to prevent the bearing from running into the inner ring and the bearing from running into the outer ring. The double planetary gear 31 is connected to the planetary support pin 33 through two second deep groove ball bearings 32, and is axially limited by the first gasket 36. The first gasket 36 is used to adjust the upper and lower spacing of the double planetary gear 31. The large gear of the double planetary gear 31 is meshed with the central gear 23, and the small gear of the double planetary gear 31 is meshed with the first inner gear ring 41 of the end cover assembly 7. The central gear 23 is connected to the first inner gear ring 41 through the double planetary gear 31. The other end of the planetary support pin 33 is also circumferentially fixed by the planetary holder 30, so that the double planetary gear 31 works more reliably. The planetary holder 30 is fixed to the planetary support 28 by the fourth screw 29. The fixing screw of the planetary holder 30 adopts a cross countersunk screw, and the head does not exceed the plane, saving axial space.

[0051] The stator sheath assembly 3 includes: an outlet shaft 14, a stator sheath 15, a second screw 16, a skeleton oil seal 17 and a third screw 26. The stator sheath assembly 3 is connected to the planetary bracket assembly 6 through the second screw 16 to fix the stator assembly 5. The outlet shaft 14 is connected to the stator sheath 15 through the third screw 26. The outer diameter of the skeleton oil seal 17 is interference fit with the outlet shaft 14 and cannot rotate relative to each other; the lip of the skeleton oil seal 17 is interference fit with the central gear 23, and the skeleton oil seal 17 and the central gear 23 can rotate relative to each other, forming a sealing structure to ensure super strong sealing performance in the working chamber.

[0052] A fourth deep groove ball bearing 40 is arranged between the stator sleeve 15 and the center gear 23. The stator sleeve 15 is matched with the center gear 23 through the fourth deep groove ball bearing 40. The inner diameter of the stator sleeve 15 is interference fit with the fourth deep groove ball bearing 40 to prevent the bearing from running off the outer ring. There is a gap between the inner diameter of the fourth deep groove ball bearing 40 and the center gear 23 for easy installation.

[0053] The hub assembly 2 includes a hub 11 and a first deep groove ball bearing 12. The hub 11 is connected to the outlet shaft 14 through the first deep groove ball bearing 12, and the hub 11 and the outlet shaft 14 can rotate relative to each other. The outer diameter of the first deep groove ball bearing 12 is interference fit with the hub 11 to ensure the sealing of the outer ring. The inner diameter of the first deep groove ball bearing 12 is clearance fit with the outlet shaft 14, but an O-ring 13 is provided between the inner diameter of the first deep groove ball bearing 12 and the outlet shaft 14 to ensure the sealing of the inner ring. The use of waterproof bearings can form a sealing structure to ensure super strong sealing performance in the working chamber.

[0054] The rotor assembly 4 includes a rotor core 24 and a magnet 25. The paired magnets 25 are attached to the rotor core 24 in order. The rotor assembly 4 is radially connected to the central gear 23 by a key 38 to prevent radial movement. The rotor assembly 4 is axially limited by a second gasket 39 to prevent axial movement. The rotor assembly 4 is fixed to the central gear 23 by a key 38 and is axially limited by a second gasket 39 to transmit effective torque. There is a gap between the inner diameter of the rotor core 24 and the central gear 23. The rotor assembly 4 and the planetary bracket 28 are separated by a second insulating paper 35 to maintain good insulation.

[0055] The stator assembly 5 includes a first insulating paper 27, a stator core 20, a winding 22, an insulating bracket 21, a PCBA board 18 and an insulating shield 19. The first insulating paper 27 and the insulating bracket 21 are installed on the stator core 20. The first insulating paper 27 and the insulating bracket 21 cooperate to isolate the winding 22 from the stator core 20, which plays a good insulating role. The PCBA board 18 is installed on the insulating shield 19, and the insulating shield 19 is installed on the insulating bracket 21 by snap-fitting, which can not only fix the PCBA board 18 but also protect the winding 22. The outer diameter of the stator assembly 5 is matched with the inner diameter clearance of the planetary bracket 28 and the stator sleeve 15, which is convenient for installation. The stator assembly 5 is radially limited by the second screw 16 to prevent relative rotation.

[0056] The end cover assembly 7 includes a first inner gear ring 41, an end cover bearing 42, an end cover O-ring 43 and an end cover 44. The outer diameter of the first inner gear ring 41 is in interference fit with the end cover 44 to prevent the first inner gear ring 41 from rotating relative to each other. The end cover 44 is fastened to the wheel hub 11 by a fifth screw 45, so that the wheel hub 11 can also rotate together. The joint surface of the end cover 44 and the wheel hub 11 is sealed and connected by the end cover O-ring 43, and effective sealing performance is ensured by the extrusion of the end cover O-ring 43. The end cover 44 is connected to the planetary retainer 30 through the end cover bearing 42, and the end cover 44 and the planetary retainer 30 can rotate relative to each other. The outer diameter of the end cover bearing 42 is in interference fit with the end cover 44 to prevent the bearing from running off the outer ring. There is a gap between the inner diameter of the end cover bearing 42 and the planetary retainer 30.

[0057] The electromagnetic brake assembly 1 includes an electromagnetic brake 8, a first screw 9 and a connecting flange 10. The electromagnetic brake 8 is connected to the motor through the first screw 9, and the electromagnetic brake 8 is connected to the wheel hub assembly 2 through the connecting flange 10. The motor is installed on the frame through the connecting flange 10, and the installation is simple. The electromagnetic brake 8 can brake the central gear 23 to achieve small torque braking and save electricity.

[0058] The present application also includes an external controller, which is electrically connected to the stator assembly 5 through a waterproof line 46. A glue injection hole is provided at the lead-out position of the output shaft 14 to ensure sealing performance while the wiring harness can withstand a certain drag force. Insulating covers are used on both sides of the wiring harness to ensure insulation and safety.

[0059] The central gear 23 is connected to the planetary support 28 through the third deep groove ball bearing 37, so that when the external controller transmits electrical energy to the stator assembly 5 through the waterproof line 46 to form a rotating magnetic field, the rotor core 24 can rotate under the action of the magnetic field of the paired rotor magnets 25, thereby driving the central gear 23 to rotate. The double planetary gear 31 is connected to the planetary support pin 33 through two second deep groove ball bearings 32. The large gear of the double planetary gear 31 is meshed with the central gear 23, and the small gear of the double planetary gear 31 is meshed with the first inner ring 41. When the central gear 23 rotates, it is transmitted to the first inner ring 41 through the double planetary gear 31, thereby driving the hub 11 and the end cover 42 to rotate together, and it can also achieve deceleration and torque increase.

[0060] The wheel hub of the present application integrates the electromagnetic brake assembly 1, the wheel hub assembly 2, the stator sleeve assembly 3, the rotor assembly 4, the stator assembly 5, the planetary bracket assembly 6 and the end cover assembly 7 into one body, which is convenient for installation, saves space and is more beautiful. By braking the central gear 23 by the electromagnetic brake 8, small torque braking can be achieved and power can be saved. The present application adopts a double-layer waterproof structure, one layer uses a waterproof bearing plus an O-ring, and the other layer uses an oil seal. The present application adopts an inner rotor structure, which is quiet, comfortable and has good controllability; by adopting a double-linked planetary reduction mechanism, a higher reduction ratio can obtain a large torque while ensuring a higher efficiency.

[0061] This application adopts an inner rotor structure with a double-tooth planetary reduction structure, which can not only ensure comfort but also effectively utilize the internal space to increase power density and bring a better experience. This application integrates a brushless DC motor with a planetary reduction mechanism to achieve the purpose of reducing weight and increasing torque.

[0062] Example 2

[0063] According to a wheelchair provided by the utility model, the inner rotor reduction hub motor for wheelchairs of Example 1 is used. Under the weight limit of the electric wheelchair, compared with the traditional direct drive motor, the present application can achieve the purpose of lighter weight, greater torque and higher efficiency. The present application installs an integrated inner rotor reduction hub motor for wheelchairs inside the wheelchair, and the motor is easy to disassemble and assemble, which can reduce the overall weight of the wheelchair motor, increase the maximum torque and power density, and has reliable waterproof performance, which helps to improve overall comfort.

[0064] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0065] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other at will.

Claims

1. An inner rotor reduction hub motor for a wheelchair, characterized in that: include: An electromagnetic brake assembly (1), a wheel hub assembly (2), a stator sleeve assembly (3), a rotor assembly (4), a stator assembly (5), a planetary support assembly (6) and an end cover assembly (7); a cavity is formed inside the wheel hub assembly (2); the electromagnetic brake assembly (1) and the end cover assembly (7) are respectively mounted at two end openings of the wheel hub assembly (2); the rotor assembly (4) and the stator assembly (5) are sealedly mounted inside the stator sleeve assembly (3); the stator sleeve assembly (3) is sealedly mounted inside the wheel hub assembly (2); the stator sleeve assembly (3) is connected to the planetary support assembly (6); the rotor assembly (4) and the stator assembly (5) are matched to be transmission-connected to the planetary support assembly (6); and the planetary support assembly (6) is transmission-connected to the end cover assembly (7).

2. The inner rotor reduction hub motor for a wheelchair as claimed in claim 1, characterized in that: The planetary support assembly (6) comprises: a central gear (23), a planetary support (28), a double planetary gear (31), a second deep groove ball bearing (32), a planetary support pin (33), a thrust bearing (34), a third deep groove ball bearing (37), a planetary retainer (30), and a first gasket (36); the planetary retainer (30) is fixed on the planetary support (28); the planetary support (28) is connected to the central gear (23) via the third deep groove ball bearing (37); The inner and outer diameters of the third deep groove ball bearing (37) are both interference fit, the duplex planetary gear (31) is connected to the planetary bracket pin (33) via the second deep groove ball bearing (32), the large gear of the duplex planetary gear (31) is meshed with the central gear (23), the small gear of the duplex planetary gear (31) is meshed with the first inner gear ring (41) of the end cover assembly (7), and the central gear (23) is transmission connected to the first inner gear ring (41) via the duplex planetary gear (31).

3. The inner rotor reduction hub motor for a wheelchair as claimed in claim 2, characterized in that: The stator sheath assembly (3) comprises: an outlet shaft (14), a stator sheath (15) and a skeleton oil seal (17); the outlet shaft (14) is connected to the stator sheath (15); the outer diameter of the skeleton oil seal (17) is interference fit with the outlet shaft (14); the lip of the skeleton oil seal (17) is interference fit with the central gear (23); and the skeleton oil seal (17) and the central gear (23) are capable of relative rotation; A fourth deep groove ball bearing (40) is arranged between the stator sleeve (15) and the central gear (23); the inner diameter of the stator sleeve (15) is interference fit with the fourth deep groove ball bearing (40); and there is a gap between the inner diameter of the fourth deep groove ball bearing (40) and the central gear (23).

4. The inner rotor reduction hub motor for a wheelchair as claimed in claim 3, characterized in that: The wheel hub assembly (2) comprises a wheel hub (11) and a first deep groove ball bearing (12); the wheel hub (11) is connected to the outlet shaft (14) via the first deep groove ball bearing (12); the wheel hub (11) and the outlet shaft (14) are capable of relative rotation; the outer diameter of the first deep groove ball bearing (12) is interference fit with the wheel hub (11); and an O-ring (13) is provided between the inner diameter of the first deep groove ball bearing (12) and the outlet shaft (14).

5. The inner rotor reduction hub motor for a wheelchair as claimed in claim 2, characterized in that: The rotor assembly (4) comprises a rotor core (24) and magnetic steel (25), wherein the magnetic steel (25) is attached to the rotor core (24) in pairs, the rotor assembly (4) is radially connected to the central gear (23) via a key (38), a gap exists between the inner diameter of the rotor core (24) and the central gear (23), and the rotor assembly (4) and the planetary support (28) are separated by a second insulating paper (35).

6. The inner rotor reduction hub motor for a wheelchair as claimed in claim 3, characterized in that: The stator assembly (5) comprises a first insulating paper (27), a stator core (20), a winding (22), an insulating bracket (21), a PCBA board (18) and an insulating shield (19); the first insulating paper (27) and the insulating bracket (21) are mounted on the stator core (20); the first insulating paper (27) and the insulating bracket (21) cooperate to isolate the winding (22) from the stator core (20); the PCBA board (18) is mounted on the insulating shield (19) by means of a buckle; and the insulating shield (19) is mounted on the insulating bracket (21).

7. The inner rotor reduction hub motor for a wheelchair as claimed in claim 2, characterized in that: The end cover assembly (7) comprises a first inner gear ring (41), an end cover bearing (42) and an end cover (44); the outer diameter of the first inner gear ring (41) is interference fit with the end cover (44); the end cover (44) is tightly connected to the wheel hub (11); and the joint surfaces of the end cover (44) and the wheel hub (11) are sealed and connected via an end cover O-ring (43); The end cover (44) is connected to the planetary holder (30) via the end cover bearing (42); the end cover (44) and the planetary holder (30) are capable of relative rotation; the outer diameter of the end cover bearing (42) is interference fit with the end cover (44); and a gap exists between the inner diameter of the end cover bearing (42) and the planetary holder (30).

8. The inner rotor reduction hub motor for a wheelchair as claimed in claim 2, characterized in that: The electromagnetic brake assembly (1) comprises an electromagnetic brake (8) and a connecting flange (10); the electromagnetic brake (8) is connected to the wheel hub assembly (2) via the connecting flange (10); the motor is mounted on the vehicle frame via the connecting flange (10); and the electromagnetic brake (8) is capable of braking the central gear (23).

9. The inner rotor reduction hub motor for a wheelchair as claimed in claim 1, characterized in that: It also includes an external controller, which is electrically connected to the stator assembly (5) via a waterproof line (46).

10. A wheelchair, characterized in that: An inner rotor reduction hub motor for a wheelchair as described in any one of claims 1 to 9 is used.

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