Inner rotor motor

Abstract

The invention discloses an inner rotor motor, which comprises a stator and a rotor capable of rotating relative to the stator, and is characterized in that the stator comprises a stator shell, a magnet located in the stator shell and at least two electric connection terminals; the rotor comprises an iron core, a rotating shaft fixed in the iron core, a coil wound on the iron core and a slip ring sleeved on the rotating shaft; the slip ring comprises at least two conducting rings arranged at intervals in the radial direction, the at least two conducting rings are electrically connected with the coil, the at least two electric connection terminals are located on one axial side of the slip ring, one end of each electric connection terminal makes contact with the corresponding conducting ring and is electrically conducted, and the other end of each electric connection terminal makes contact with the corresponding conducting ring. And the other ends of the at least two electric connection terminals are used for receiving alternating current. The conducting rings of the motor are arranged at intervals in the radial direction, so that the axial size of the slip ring is small, the iron core of the rotor can keep a large axial size, and the performance of the motor is enhanced.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to an inner rotor motor. Background Art

[0002] The motor is composed of a stator and a rotor that rotate relative to each other. According to the positional relationship between the stator and the rotor, it can be divided into two categories: inner rotor motor and outer rotor motor. The stator of an inner rotor motor includes a stator shell, a magnet fixed on the inner wall of the stator shell, and a plurality of brushes. The rotor includes an iron core, a coil wound around the rotor iron core, and a slip ring that rotates with the shaft. The slip ring is roughly cylindrical and includes a plurality of conductive rings that are spaced apart in the axial direction and electrically connected to the coils respectively. During the rotation of the rotor, external alternating current is transmitted to the coil through a plurality of brushes and a plurality of conductive rings. The motor transmits alternating current to the coil through brushes and slip rings, without the need for a traditional commutator for mechanical commutation, which can effectively increase the life of the motor.

[0003] However, the plurality of conductive rings are arranged axially, occupying a large axial space, resulting in a large axial length of the motor. When the axial length of the motor needs to be limited within a certain range, the rotor core can only be shortened, resulting in reduced motor performance. Summary of the invention

[0004] In view of this, an inner rotor motor is provided which takes into account both motor performance and motor size.

[0005] An inner rotor motor comprises a stator and a rotor rotatable relative to the stator, wherein the stator comprises a stator shell, at least one magnet located in the stator shell, and at least two electrical connection terminals; the rotor comprises an iron core, a rotating shaft fixed in the iron core, a coil wound around the iron core, and a slip ring sleeved on the rotating shaft; the slip ring comprises at least two conductive rings spaced apart in a radial direction, the at least two conductive rings are electrically connected to the coil, the at least two electrical connection terminals are located on one axial side of the slip ring, one end of the at least two electrical connection terminals are respectively in contact with and electrically connected to the corresponding conductive ring, and the other end of the at least two electrical connection terminals is used to receive alternating current.

[0006] Compared with the prior art, in the inner rotor motor of the present application, the conductive rings are arranged at intervals in the radial direction, so the axial dimension of the slip ring is smaller, so that the iron core of the rotor can maintain a larger axial dimension to enhance the performance of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic structural diagram of an embodiment of an inner rotor motor of the present application.

[0008] Figure 2 for Figure 1 An exploded view of an inner rotor motor is shown.

[0009] Figure 3 for Figure 2 A further exploded view of the inner rotor motor is shown.

[0010] Figure 4 for Figure 3 Front view of an exploded view of an inner rotor motor shown.

[0011] Figure 5 for Figure 1 A cross-sectional view of an inner rotor motor is shown.

[0012] Figure 6 for Figure 1 A plan view of the slip rings of an inner rotor motor is shown.

[0013] Figure 7 for Figure 1 A schematic structural diagram of the insulating body and conductive terminals of the inner rotor motor is shown.

[0014] Figure 8 for Figure 1 A schematic structural diagram of the slip ring, electrical connection terminals and power connection parts of the inner rotor motor is shown.

[0015] Fig. 9 for Figure 1 A schematic structural diagram of an elastic arm of another embodiment of an inner rotor motor is shown.

[0016] Description of Figure Numbers:

[0017] Stator 10, stator housing 12, cap 121, notch 123, magnet 14, electrical connection terminal 15, power connection member 16, axial extension portion 161, radial extension portion 163, power receiving portion 151, elastic arm 153 (155), protrusion 154, end cover 17, first clamping block 171, second clamping block 173, cover plate 18, first clamping port 181, second clamping port 183, bearing 19;

[0018] Rotor 30, shaft 31, core 32, coil 34, slip ring 36, conductive ring 361, groove 363, insulating base 38, first protrusion 380, anti-twist protrusion 381, second protrusion 383, reinforcing rib 385, conductive terminal 39, slip ring connecting part 391, hook part 393, positioning part 395, first sleeve 41, second sleeve 43. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. One or more embodiments of the present application are exemplarily given in the drawings to make the understanding of the technical solution disclosed in the present application more accurate and thorough. However, it should be understood that the present application can be implemented in a variety of different forms and is not limited to the embodiments described below.

[0020] The same or similar numbers in the drawings of this application correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0021] The present application provides an inner rotor motor, Figure 1-3 A specific embodiment of the present application is shown. The inner rotor motor shown includes a stator 10 and a rotor 30 rotatably disposed in the stator 10 .

[0022] The stator 10 includes a stator shell 12, at least one magnet 14 fixed on the inner wall surface of the stator shell 12, and at least two electrical connection terminals 15. The at least one magnet 14 is preferably two or more magnets arranged at intervals along the circumferential direction of the stator shell 12, so that the stator 10 forms N and S poles in the circumferential direction. The at least one magnet 14 can also be an annular magnet, which includes two or more magnetic poles arranged in the circumferential direction, so that the stator 10 also forms N and S poles in the circumferential direction. The magnet 14 is preferably ferrite. Without considering the cost, the magnet 14 can also be a permanent magnet made of a strong magnetic material such as neodymium iron boron; or the magnet 14 can also be an electromagnet, which generates a stable magnetic field when powered on. Preferably, the at least two electrical connection terminals 15 are spaced apart in the circumferential direction.

[0023] Please also see Figures 4 to 5 The rotor 30 includes a rotating shaft 31, an iron core 32, a coil 34 wound on the iron core 32, and a slip ring 36 sleeved on the rotating shaft 31. The rotating shaft 31 is fixed in the iron core 32. The slip ring 36 is electrically connected to the coil 34. The iron core 32 can be formed by stacking a plurality of silicon steel sheets, including a yoke sleeved on the rotating shaft 31 and a plurality of teeth extending radially outward from the yoke. The rotating shaft 31 can be inserted into the yoke of the iron core 32, and its two ends extend out of the iron core 32. The coil 34 is wound on each tooth, and adjacent teeth are spaced apart in the circumferential direction to form a winding groove for winding the coil 34.

[0024] Please refer to Figure 6 , the slip ring 36 includes at least two conductive rings 361 arranged at intervals in the radial direction. The at least two conductive rings 361 are concentric rings. In this embodiment, the slip ring 36 is roughly plate-shaped, and the surface of the conductive ring 361 for receiving the power supply is perpendicular to the axial direction. Preferably, the slip ring 36 is a printed circuit board that rotates with the rotating shaft 31, and at least two annular conductive circuits are formed on the surface of the side (first side) of the printed circuit board facing the electrical connection terminal 15, and the at least two annular conductive circuits form the above-mentioned at least two conductive rings 361. Preferably, at least two pads are also formed on the surface of the printed circuit board, and the at least two pads are respectively connected to the corresponding conductive circuits through the circuits inside the printed circuit board. More preferably, the at least two pads are formed on the surface of the other side (second side) of the printed circuit board, close to the position of the rotating shaft 31.

[0025] The electrical connection terminal 15 is located on one axial side of the slip ring 36. One end of the electrical connection terminal 15 is in contact with and electrically connected to the corresponding conductive ring 361, and the other end of the electrical connection terminal 15 is used to receive alternating current.

[0026] The coil 34 may be a multi-phase coil or a single-phase coil. When the coil 34 is a multi-phase coil, the number of the conductive rings 361 and the number of the electrical connection terminals 15 are not less than the number of phases of the multi-phase coil, wherein each phase coil is electrically connected to one of the conductive rings 361, so that each phase coil can be connected to the alternating current through a conductive ring and the electrical connection terminal 15 in contact with the conductive ring, and the number of the conductive rings 361 and the number of the electrical connection terminals 15 are preferably equal to the number of phases of the multi-phase coil. When the coil 34 is a single-phase coil, the number of the conductive rings 361 and the number of the electrical connection terminals 15 are both two, and the two conductive rings 361 are respectively connected to the head and tail ends of the single-phase coil, so that the first end and the second end of the single-phase coil can be connected to the alternating current through a conductive ring 361 and the electrical connection terminal 15 in contact with the conductive ring 361.

[0027] In this embodiment, the coil 34 is a three-phase coil (U, V, W), and the three-phase coil can adopt the common star connection (Y connection) or triangle connection (△ connection) of the three-phase motor. Each phase coil 34 can be composed of multiple coils connected in parallel or in series; accordingly, the alternating current is a three-phase alternating current. The following takes the three-phase coil, three conductive rings 361, and three electrical connection terminals 15 as examples to illustrate the inner rotor motor of the present application. When the inner rotor motor is started, the three-phase alternating current is transmitted to the three-phase coil of the rotor through the three electrical connection terminals 15 and the three conductive rings 361. The alternating current can be a sine wave, a square wave, etc. The current in each phase coil can form a phase difference of 120 degrees, thereby generating a rotating magnetic field, so that the rotor 30 can continue to rotate relative to the stator 10. During the rotation of the rotor 30, the electrical connection terminal 15 and the conductive ring 361 are always kept in an electrically conductive state, playing the role of electrical connection.

[0028] It should be understood that the coils of the rotor 30 can be configured with any number of phases, such as four phases, five phases, etc.; at this time, the number of conductive rings 361 and electrical connection terminals 15 is adjusted according to the number of phases of the coils 34, and each conductive ring 361 conducts one phase of the coil to the alternating current. In the embodiment of the present application, only three-phase coils are used as an example for illustration, but it is not limited to this.

[0029] Compared with the prior art, the at least two conductive rings 361 are spaced apart in the radial direction, so the axial dimension of the slip ring 36 is smaller, so that the iron core 32 of the rotor 30 can maintain a larger axial dimension to enhance the performance of the motor; the inner rotor motor of the present application is particularly suitable for motors with small outer diameters (for example, motors with an outer diameter less than or equal to 26 mm).

[0030] Preferably, please also refer to Figure 7 The rotor 30 further includes an insulating base 38 and at least two conductive terminals 39, the insulating base 38 is sleeved on the rotating shaft 31, and the conductive terminals 39 are fixed by the insulating base 38. Preferably, the insulating base 38 is made of Bakelite. Preferably, the insulating base 38 is injection molded on the conductive terminals 39. At least part of the insulating base 38 is located on the side of the slip ring 36 close to the iron core 32. The number of the conductive terminals 39 is the same as the number of the conductive rings 361. One end of the at least two conductive terminals 39 is respectively connected to the coil 34, and the other end is respectively electrically connected to the corresponding conductive ring 361.

[0031] Preferably, the rotor 30 further comprises a first sleeve 41, which is tightly fitted on the rotating shaft 31. Preferably, the sleeve 41 is a metal sleeve. The slip ring 36 is positioned between the sleeve 41 and the insulating base 38 in the axial direction.

[0032] Preferably, the insulating base 38 has a first protrusion 380 at one end facing the first sleeve 41. The axial end face of the first protrusion 380 abuts the first sleeve 41, so that the first sleeve 41 axially limits the insulating base 38. The first protrusion 380 can directly abut the first sleeve 41, or indirectly abut the first sleeve 41 through a gasket or other element. The projection of the first protrusion 380 on a plane perpendicular to the rotating shaft 31 is smaller than the projection of the insulating base 38 on a plane perpendicular to the rotating shaft 31, so as to reduce the axial end face of the insulating base 38 for abutting the first sleeve 41. The first protrusion 380 has a smaller axial end face, so its flatness is better controlled and guaranteed, and it can better cooperate with the first sleeve 41 to achieve axial positioning. In this embodiment, the first protrusion 380 is an annular protrusion. In other embodiments, the first protrusion 380 can also be at least one arc-shaped protrusion, or at least two protrusions arranged at intervals in the circumferential direction. The slip ring 36 is sleeved on the outer circumference of the first protrusion 380 and is positioned between the first sleeve 41 and the insulating base 38 in the axial direction.

[0033] Preferably, an anti-twist protrusion 381 is formed on the radial outer side of the first protrusion 380, and a groove 363 is formed on the radial inner side of the slip ring 36, and the groove 363 cooperates with the anti-twist protrusion 381 to prevent relative rotation between the insulating base 38 and the slip ring 36. It can be understood that an anti-twist groove may also be formed on the radial outer side of the first protrusion 380, and a protrusion is formed on the radial inner side of the slip ring 36, and the protrusion cooperates with the anti-twist groove to prevent relative rotation between the insulating base 38 and the slip ring 36.

[0034] Preferably, the end of the insulating base 38 facing the iron core 32 has a second protrusion 383, and the axial end face of the second protrusion 383 abuts the iron core 32. The second protrusion 383 can directly abut the iron core 32, or it can indirectly abut the iron core 32 through the second sleeve 43 and / or gasket and other components. The projection of the second protrusion 383 on the plane perpendicular to the rotating shaft 31 is smaller than the projection of the insulating base 38 on the plane perpendicular to the rotating shaft 31, so as to reduce the axial end face of the insulating base 38 for abutment. The second protrusion 383 has a smaller axial end face, so its flatness is better controlled and guaranteed, and axial positioning can be better achieved. In this embodiment, the second protrusion 383 is an annular protrusion. In other embodiments, the second protrusion 383 can also be at least one arc-shaped protrusion, or at least two protrusions arranged at intervals in the circumferential direction.

[0035] Preferably, a reinforcing rib 385 is provided at a position of the axial end surface of the insulating base 38 near the hook 393 to make this portion have higher strength to prevent damage to this portion when the conductive terminal 39 is bent to form the hook 393 .

[0036] Please refer to Figure 5Each conductive terminal 39 has a slip ring connection part 391, a hook part 393 and a positioning part 395 connected between the slip ring connection part 391 and the hook part 393. The hook part 393 is connected to the coil 34, and the positioning part 395 is fixed in the insulating base 38. Preferably, the positioning part 395 can be fixed in the insulating base 38 by injection molding; it can be understood that the positioning part 395 can also be fixed in the insulating base 38 by plugging and other methods. The slip ring connection part 391 of the conductive terminal 39 is electrically connected to the corresponding conductive ring 361. In this embodiment, the slip ring connection part 391 extends in the radial direction and forms an opening facing the radial outside together with the positioning part 395. The slip ring connection part 391 is welded to the pad of the printed circuit board. The hook part 393 has an open mouth connected to the opening, and the open mouth faces the side facing away from the iron core 32 in the axial direction. Preferably, according to the needs of winding, the hook part 393 of each conductive terminal 39 can have one or more hooks for connecting the coil 34. The multiple hooks of the same conductive terminal 39 are at the same potential.

[0037] Preferably, please refer to Figure 8 Each electrical connection terminal 15 includes a power receiving portion 151 axially spaced from the slip ring 36 and an elastic arm 153 extending from the power receiving portion 151 toward the slip ring 36. The elastic arm 153 elastically abuts against the corresponding conductive ring 361 to avoid a gap between the electrical connection terminal 15 and the conductive ring 361, thereby ensuring good contact between the electrical connection terminal 15 and the conductive ring 361, and avoiding power failure due to poor contact. There is an angle between the extension direction of the elastic arm 153 and the axial direction of the inner rotor motor. The angle is greater than 0 degrees and less than 90 degrees. Preferably, the angle is greater than or equal to 35 degrees and less than or equal to 55 degrees.

[0038] Preferably, a protrusion 154 is formed at the end of the elastic arm 153, and the protrusion 154 abuts against and electrically conducts with the corresponding conductive ring 361. The surface of the protrusion 154 is preferably, but not limited to, a spherical surface or an ellipsoidal spherical surface. The contact between the protrusion 154 and the conductive ring 361 can reduce the contact area, thereby reducing the position where wear occurs, and can make the electrical connection terminal 15 more smoothly contact with the conductive ring 361 when the rotor 30 rotates. In other embodiments, the protrusion 154 may not be provided at the end of the elastic arm 153, but a carbon brush may abut against the conductive ring 361.

[0039] Please refer to Fig. 9 In another embodiment, the electrical connection terminal 15 includes two elastic arms 155 extending from the power receiving portion 151 toward the conductive ring. The two elastic arms 155 are respectively located in the counterclockwise direction and the clockwise direction of the power receiving portion 151. The two elastic arms 155 are both in contact with the same conductive ring 361, which can better ensure electrical conduction between the elastic arms 155 and the conductive ring 361.

[0040] Preferably, the stator 10 further includes an end cover 17, which is fixed to one axial end of the stator shell 12, and a cap 121 is provided at the other axial side end of the stator shell. In this embodiment, the cap 121 and the stator shell 12 are an integral structure formed in one piece. It can be understood that the cap 121 can also be formed independently from the stator shell 12 and then assembled into one piece. The stator 10 can further include a cover plate 18 covered on the end cover 17. Preferably, the cap 121 is formed with a bearing seat to install the bearing 19, and the end cover 17 or the cover plate 18 is also formed with a bearing seat to install the bearing 19. The two ends of the rotating shaft 31 are respectively inserted into a bearing 19, and the bearing 19 supports the rotating shaft 31 so that the rotor 30 can rotate smoothly. At least two electrical connection terminals 15 are fixed to the end cover 17.

[0041] The end cover 17 is provided with a first clamping block 171 and a second clamping block 173. The first clamping block 171 protrudes from one axial side of the end cover 17, and the second clamping block 173 protrudes from the outer periphery of the end cover 17. The cover plate 18 is provided with a first clamping opening 181 and a second clamping opening 183. The first clamping block 171 is clamped into the first clamping opening 181, and the second clamping block 173 is clamped into the notch 123 at one end of the stator housing 12 and the second clamping opening 183, so that the end cover 17, the cover plate 18 and the stator housing 12 are fixed together.

[0042] Preferably, the inner rotor motor of the present application further comprises at least two power connectors 16 for receiving power. The power connectors 16 are fixed on the end cover 17. For details, please refer to Fig. 9 The power connector 16 has an axial extension portion 161 and a radial extension portion 163. The axial extension portion 161 protrudes to the side of the end cover 17 away from the slip ring 36, and the radial extension portion 163 is located on the side of the end cover 17 close to the slip ring 36, which is used for axial positioning of the power connector 16.

[0043] In this embodiment, the number of power connectors 16 is the same as the number of electrical connection terminals 15. One end of the power connector 16 extends to the outside of the end cover 17 for receiving alternating current, and the other end is connected to the corresponding electrical connection terminal 15 to transmit the alternating current to the electrical connection terminal 15. Preferably, the radial extension portion 163 of each power connector 16 is fixedly connected to the power receiving portion 151 of each electrical connection terminal 15 by riveting, welding, or the like.

[0044] In other embodiments, the power connector 16 can also be used to receive direct current. In this case, the inner rotor motor is further integrated with a DC-AC conversion circuit, which is used to convert direct current into alternating current and then transmit the alternating current to the electrical connection terminal 15.

[0045] It should be noted that the present application is not limited to the above-mentioned implementation modes. According to the creative spirit of the present application, technical personnel in this field may also make other changes. These changes made according to the creative spirit of the present application should be included in the scope of protection required by the present application.

Claims

1. An inner rotor motor, comprising a stator and a rotor rotatable relative to the stator, characterized in that: The stator includes a stator shell, at least one magnet located in the stator shell, and at least two electrical connection terminals; the rotor includes an iron core, a rotating shaft fixed in the iron core, a coil wound around the iron core, and a slip ring sleeved on the rotating shaft; the slip ring includes at least two conductive rings arranged at intervals in a radial direction, the at least two conductive rings are electrically connected to the coil, the at least two electrical connection terminals are located on one axial side of the slip ring, one end of the at least two electrical connection terminals are respectively in contact with the corresponding conductive ring and electrically conductive, and the other end of the at least two electrical connection terminals is used to receive alternating current.

2. The inner rotor motor according to claim 1, characterized in that: The coil is a multi-phase coil, the number of the at least two conductive rings and the number of the at least two electrical connection terminals are not less than the number of phases of the multi-phase coil, and each phase coil receives the alternating current through a corresponding conductive ring and an electrical connection terminal in contact with the conductive ring.

3. The inner rotor motor according to claim 1 or 2, characterized in that: The slip ring is in the shape of a plate, and the rotor further includes an insulating base set on the rotating shaft and at least two conductive terminals fixed by the insulating base, at least part of the insulating base is located on a side of the slip ring close to the iron core, the number of the at least two conductive terminals is the same as the number of the at least two conductive rings, one end of the at least two conductive terminals is respectively connected to the coil, and the other end is respectively electrically connected to the corresponding conductive ring.

4. The inner rotor motor according to claim 3, characterized in that: The rotor further comprises a shaft sleeve, which is tightly fitted on the rotating shaft, and the slip ring is positioned between the shaft sleeve and the insulating base in the axial direction.

5. The inner rotor motor according to claim 4, characterized in that: The insulating base has a protrusion at one end facing the sleeve, the axial end face of the protrusion directly or indirectly abuts the sleeve, the projection of the protrusion on a plane perpendicular to the rotating shaft is smaller than the projection of the insulating base on a plane perpendicular to the rotating shaft, and the slip ring is arranged on the outer periphery of the protrusion.

6. The inner rotor motor according to claim 5, characterized in that: An anti-twist-out convex block is formed on the radial outer side of the protrusion, and a groove is formed on the radial inner side of the slip ring, and the groove cooperates with the anti-twist-out convex block to prevent relative rotation between the insulating base and the slip ring; or, An anti-twist groove is formed on the radial outer side of the protrusion, and a convex block is formed on the radial inner side of the slip ring. The convex block cooperates with the anti-twist groove to prevent relative rotation between the insulating base and the slip ring.

7. The inner rotor motor according to claim 3, characterized in that: Each conductive terminal has a slip ring connecting portion, a hook portion, and a positioning portion connected between the slip ring connecting portion and the hook portion, the slip ring connecting portion extends in a radial direction for being electrically connected to a corresponding conductive ring, the hook portion is connected to the coil, the positioning portion is fixed in the insulating base, and the positioning portion and the slip ring connecting portion together form an opening facing radially outward.

8. The inner rotor motor according to claim 7, characterized in that: The slip ring is a printed circuit board that rotates with the rotating shaft. At least two annular conductive circuits are formed on a surface of the printed circuit board that is away from the iron core. The at least two annular conductive circuits form the at least two conductive rings.

9. The inner rotor motor according to claim 8, characterized in that: At least two pads are formed on a surface of one side of the printed circuit board close to the iron core. The positions of the at least two pads are close to the rotating shaft. The number of the at least two pads is the same as the number of the at least two conductive circuits. The at least two pads are respectively connected to the corresponding conductive circuits through the circuits inside the printed circuit board, and the slip ring connecting part of the conductive terminal is welded to the corresponding pads.

10. The inner rotor motor according to claim 7, characterized in that: A reinforcing rib is provided on the axial end surface of the insulating base near the hook portion.

11. The inner rotor motor according to claim 3, characterized in that: The insulating base has a protrusion at one end facing the iron core, and the axial end face of the protrusion directly or indirectly abuts the iron core. The projection of the protrusion on the plane perpendicular to the rotating axis is smaller than the projection of the insulating base on the plane perpendicular to the rotating axis, so as to reduce the axial end face of the insulating base for abutment.

12. The inner rotor motor according to claim 1 or 2, characterized in that: The at least two electrical connection terminals are spaced apart along the circumferential direction, each electrical connection terminal comprises a power receiving portion spaced apart from the slip ring axially and an elastic arm extending from the power receiving portion toward the slip ring, the elastic arm elastically abuts against the corresponding conductive ring, an angle is formed between the extension direction of the elastic arm and the axial direction of the inner rotor motor, and the angle is greater than 0 degrees and less than 90 degrees.

13. The inner rotor motor according to claim 1 or 2, characterized in that: The stator further comprises an end cover and at least two power connectors for receiving power, wherein the end cover is fixed to one axial end of the stator shell, and the at least two power connectors are fixed to the end cover. The at least two power connectors are used to receive alternating current (AC), the number of the at least two power connectors is the same as the number of the electrical connection terminals, and each of the power connectors is connected to a corresponding electrical connection terminal to transmit the AC power to the electrical connection terminal; or the at least two power connectors are used to receive direct current (DC), and the inner rotor motor is further integrated with a DC-AC conversion circuit, which is used to convert the DC power into AC power and then transmit the AC power to the electrical connection terminal.

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