Coreless motor

Abstract

The invention discloses a coreless motor, relates to the technical field of coreless motors, and aims to solve the problem of short service life of the coreless motor in the prior art. The coreless motor comprises a motor body, an end cover, a stator, a rotor and a temperature detection module, wherein the end cover is arranged on the motor body; the stator is arranged in the machine body; the rotor is arranged in the machine body, the rotor is arranged in the stator in a penetrating mode, and the two ends of the rotor are rotationally connected with the machine body and the end cover through bearings respectively; the temperature detection module is arranged on the end cover, the temperature detection module is provided with a sensing part, and the sensing part is in contact with the first end face, close to the end cover, of the stator.

Description

Technical Field

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

[0002] Coreless motors have the characteristics of compact structure, high speed and high power density. Coreless motors generate a lot of heat during operation, especially under high load and high power output, the internal temperature of the motor will rise sharply, which will greatly shorten the service life of the coreless motor. Summary of the invention

[0003] The embodiments of the present application provide a coreless motor, which is used to solve the problem of short service life of the coreless motor in the related art.

[0004] An embodiment of the present application provides a hollow cup motor, comprising: a body, an end cover, a stator, a rotor and a temperature detection module, wherein the end cover is arranged on the body; the stator is arranged in the body; the rotor is arranged in the body, the rotor is passed through the interior of the stator, and the two ends of the rotor are rotatably connected to the body and the end cover through bearings respectively; the temperature detection module is arranged on the end cover, and the temperature detection module has a sensing part, and the sensing part is in contact with the first end face of the stator close to the end cover.

[0005] The coreless cup motor provided in the embodiment of the present application is provided with a temperature detection module on the end cover, and the sensing part of the temperature detection module is in contact with the first end face of the stator close to the end cover. In this way, when the coreless cup motor is running, the temperature detection module can accurately detect the temperature of the stator in real time. In this way, when the stator temperature exceeds the preset value during the operation of the coreless cup motor, the user can discover it in time and shut down the motor, thereby reducing the risk of damage to the coreless cup motor due to excessive stator temperature, thereby helping to extend the service life of the coreless cup motor.

[0006] In some embodiments, the stator includes a bobbin and a coil wound around the outside of the bobbin, and an end surface of the bobbin close to the end cover is the first end surface.

[0007] Through the above settings, the temperature of the wire cup with the fastest temperature rise in the stator can be further accurately measured, so that the user can discover the problem of overtemperature earlier, and reserve more time for the user's subsequent work processing.

[0008] In some embodiments, the temperature detection module includes a circuit board and a temperature sensor disposed on the end cover, the stator is electrically connected to the circuit board, the end of the temperature sensor close to the first end surface is the sensing part, and the connection end of the temperature sensor away from the sensing part is electrically connected to the circuit board.

[0009] Through the above settings, the temperature sensor can interact with the external device in real time, so that the user can monitor the working status of the temperature sensor through the external device. At the same time, the temperature sensor and the circuit board are both arranged on the end cover, which facilitates the assembly and installation of the temperature detection module and the end cover.

[0010] In some embodiments, the circuit board includes a flexible circuit board and a rigid circuit board, and the stator is electrically connected to the flexible circuit board; the flexible circuit board is annular, and the flexible circuit board is located between the first end surface and the rigid circuit board; the temperature sensor passes through the flexible circuit board and is connected to the flexible circuit board, and the connecting end of the temperature sensor is electrically connected to the rigid circuit board.

[0011] Through the above arrangement, the temperature sensor passes through the flexible circuit board and the connecting end is electrically connected to the flexible circuit board. In this way, when the stator wire cup shakes during the operation of the hollow cup motor, the temperature sensor in contact with the wire cup can also move accordingly while ensuring contact with the first end face of the wire cup, thereby reducing the probability of damage to the temperature sensor during operation shaking, thereby improving the reliability and detection accuracy of the temperature detection module.

[0012] In some embodiments, the stator includes a bobbin and a coil wound around the outside of the bobbin, and an end face of the bobbin close to the end cover is the first end face; the orthographic projection of the flexible circuit board on the stator covers the first end face; and / or the coil is electrically connected to the flexible circuit board.

[0013] Through the above arrangement, the positioning of the temperature sensor is facilitated and the assembly accuracy of the hollow cup motor is improved.

[0014] In some embodiments, an encoder is provided on the end cover, and the encoder is an integral structure with the rigid circuit board.

[0015] Through the above arrangement, the number of parts is reduced, which is beneficial to improving the assembly efficiency of the hollow cup motor.

[0016] In some embodiments, the rigid circuit board is provided with a through hole, and the through hole is used for electrically connecting the flexible circuit board to an external device.

[0017] Through the above arrangement, the flexible circuit board can be easily connected to the external device through the rigid circuit board.

[0018] In some embodiments, the temperature sensor is a NTC sensor.

[0019] In some embodiments, the bearing connected to the machine body is a first bearing, and the bearing connected to the end cover is a second bearing; an avoidance hole is provided on the end cover, and the avoidance hole is used to set the rotor and the second bearing, and the hole wall of the avoidance hole is connected to the outer wall of the second bearing through a buffer member.

[0020] By arranging a buffer between the second bearing and the end cover, the vibration between the second bearing, the rotor and the end cover is reduced, which can play a shock-absorbing role to a certain extent, improve the working stability of the hollow cup motor, and thus extend the service life of the hollow cup motor.

[0021] In some embodiments, a groove is formed on the wall of the avoidance hole, and the groove extends along the circumference of the avoidance hole. The buffer is an O-ring, and the diameter of the buffer is greater than the depth or width of the groove.

[0022] Through the above arrangement, the connection reliability between the second bearing and the end cover is improved, and not only the sealing performance of the connection between the second bearing and the end cover is improved, but also the noise generated by the hollow cup motor during operation can be effectively reduced.

[0023] In some embodiments, a spring is provided in the avoidance hole, and a stop flange is connected to one end of the avoidance hole away from the first end surface, and the spring is compressed between the second bearing and the stop flange.

[0024] Through the above arrangement, the vibration and noise of the coreless cup motor are further reduced during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the structure of a coreless cup motor in some embodiments of the present application;

[0027] Figure 2 for Figure 1 Exploded diagram of the coreless motor in Figure 1;

[0028] Figure 3 for Figure 1 The schematic diagram of the structure of the coreless motor without end cover;

[0029] Figure 4 for Figure 1 Bottom view of the coreless motor in FIG.

[0030] Figure 5 for Figure 4 AA section view in;

[0031] Figure 6 for Figure 4 BB section view in;

[0032] Figure 7 It is an assembly cross-sectional view of the rotor, the body and the first bearing in some embodiments of the present application;

[0033] Figure 8 This is an assembled cross-sectional view of the end cover, the second bearing and the circuit board in some embodiments of the present application.

[0034] Description of reference numerals:

[0035] 1. Machine body; 101. Opening; 102. Closed end; 103. Through hole; 2. End cover; 201. Avoidance hole; 202. Groove; 203. Stop flange; 3. Buffer; 4. Spring;

[0036] 10. stator; 11. wire cup; 110. first end surface; 12. coil;

[0037] 20. rotor; 21. rotating shaft; 22. bushing; 23. magnetic steel;

[0038] 30. bearing; 31. first bearing; 32. second bearing;

[0039] 40. Temperature detection module; 401. Sensing unit; 402. Connecting end; 41. Circuit board; 410. Through hole; 411. Flexible circuit board; 412. Rigid circuit board; 413. Connecting cable; 42. Temperature sensor;

[0040] 50. Encoder. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] In the description of the present application, it should be understood that the terms "center", "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 device or element referred to 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.

[0043] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0045] Coreless motors have the characteristics of compact structure, high speed, and high power density. Coreless motors generate a lot of heat during operation, especially under high load and high power output, the internal temperature of the motor will rise sharply. Specifically, during the operation of the coreless motor, the stator temperature rises quickly, which can easily shorten the service life of the coreless motor.

[0046] In order to solve the above problems, the embodiment of the present application provides a hollow cup motor. By setting a temperature detection module on the end cover, the sensing part of the temperature detection module is in contact with the first end face of the stator close to the end cover. When the hollow cup motor is running, the temperature detection module can accurately detect the temperature of the stator in real time, so that the user can find out and shut down the motor in time, reducing the risk of damage to the hollow cup motor due to excessive stator temperature, thereby helping to extend the service life of the hollow cup motor.

[0047] like Figure 2 , Figure 3 and Figure 5As shown, the coreless motor comprises: a body 1, an end cover 2, a stator 10, a rotor 20 and a temperature detection module 40, wherein the end cover 2 is arranged on the body 1; the stator 10 is arranged in the body 1; the rotor 20 is arranged in the body 1, and the rotor 20 is penetrated inside the stator 10, and the two ends of the rotor 20 are rotatably connected with the body 1 and the end cover 2 respectively through bearings 30; the temperature detection module 40 is arranged on the end cover 2, and the temperature detection module 40 has a sensing part 401, and the sensing part 401 contacts the first end face 110 of the stator 10 close to the end cover 2. Usually, the stator 10 is fixed to the body 1, so during the operation of the coreless motor, the stator 10, the body 1 and the end cover 2 are relatively fixed, and the rotor 20 rotates relative to the stator 10. The bearing 30 mainly plays the role of ensuring the coaxiality of the rotor 20 and the stator 10.

[0048] The body 1 is cylindrical, with an opening 101 at one end and a closed end. The end cover 2 is disposed on the opening 101 of the body 1 .

[0049] The rotor 20 comprises a rotating shaft 21, two sleeves 22 and a magnetic steel 23, and the magnetic steel 23 is fixedly connected to the rotating shaft 21 through the sleeve 22. The closed end 102 of the body 1 is provided with a through hole 103 for the rotating shaft 21 to be set; the two ends of the rotor 20 are rotatably connected to the body 1 and the end cover 2 through the bearing 30, respectively. Specifically, one end of the rotating shaft 21 is set in the through hole 103 of the closed end 102 of the body 1 through the bearing 30, and the end cover 2 is provided with an avoidance hole 201, which is used to set the rotor 20 and the bearing 30. Specifically, the avoidance hole 201 is used to set the rotating shaft 21 and the bearing 30, and the other end of the rotating shaft 21 is set in the avoidance hole 201 of the end cover 2 through the bearing 30. The sleeve 22 is interference fit with the rotating shaft 21, and the two sleeves 22 are respectively correspondingly set on the inner side of the bearing 30 to fix the magnetic steel 23 to the rotating shaft 21. Specifically, the magnetic steel 23 is first bonded and fixed to the rotating shaft 21, and then the two ends are pressed into the sleeve 22, and finally two bearings 30 are respectively pressed into the outer ends of the sleeve 22. It should be noted that the bearing 30 connected to the body 1 is the first bearing 31, and the bearing 30 connected to the end cover 2 is the second bearing 32.

[0050] During the operation of the coreless motor, the stator 10 is fixed relative to the body 1 and the end cover 2, and the rotor 20 rotates relative to the stator 10. After many experimental tests, the technicians found that during the operation of the coreless motor, the temperature of the stator 10 rises relatively quickly, so the temperature detection module 40 is set on the end cover 2, which facilitates the assembly of the temperature detection module 40 with the end cover 2 and the body 1. At the same time, the temperature detection module 40 is used to detect the temperature of the stator 10 during the operation of the coreless motor. During the installation of the temperature detection module 40, the sensing part 401 of the temperature detection module 40 is brought into contact with the first end face 110 of the stator 10 close to the end cover 2, so that the sensing part 401 can directly detect the temperature of the stator 10.

[0051] The coreless cup motor provided in the embodiment of the present application is provided with a temperature detection module 40 on the end cover 2, and the sensing part 401 of the temperature detection module 40 is in contact with the first end face 110 of the stator 10 close to the end cover 2. Thus, when the coreless cup motor is in operation, the temperature detection module 40 can accurately detect the temperature of the stator 10 in real time. Thus, when the temperature of the stator 10 exceeds a preset value during the operation of the coreless cup motor, the user can promptly discover and shut down the motor, thereby reducing the risk of damage to the coreless cup motor due to excessive temperature of the stator 10, thereby helping to extend the service life of the coreless cup motor.

[0052] like Figure 5 As shown, in some embodiments, the stator 10 includes a wire cup 11 and a coil 12 wound around the outside of the wire cup 11 , and an end surface of the wire cup 11 close to the end cover 2 is a first end surface 110 .

[0053] After many experimental tests, the technicians found that during the operation of the hollow cup motor, the temperature of the wire cup 11 rises faster than that of the coil 12. Therefore, the end face of the wire cup 11 close to the end cover 2 is the first end face 110, that is, the sensing part 401 of the temperature detection module 40 is in contact with the first end face 110 of the wire cup 11. In this way, the temperature of the wire cup 11 with the fastest temperature rise in the stator 10 can be further accurately measured, so that the user can discover the problem of overtemperature earlier, which not only improves the accuracy of temperature detection, but also reserves more time for the user's subsequent work processing, thereby further improving the reliability of the hollow cup.

[0054] like Figure 3 and Figure 5 As shown, in some embodiments, the temperature detection module 40 includes a circuit board 41 and a temperature sensor 42 arranged on the end cover 2, the temperature sensor 42 is electrically connected to the circuit board 41, the end of the temperature sensor 42 close to the first end face 110 is a sensing part 401, and the connection end 402 of the temperature sensor 42 away from the sensing part 401 passes through the circuit board 41 and extends out of the end cover 2, and the connection end 402 is electrically connected to an external device.

[0055] Through the above-mentioned settings, the temperature sensor 42 can interact with the external device in real time. The external device may include a controller. That is to say, the temperature sensor 42 can send the detected actual temperature to the controller in real time. The controller compares the actual temperature with the preset temperature. When the actual temperature is greater than the preset temperature, the controller controls the alarm device to alarm. If necessary, it can even control the hollow cup motor to stop. In this way, the user can monitor the working status of the temperature sensor 42 through the external device. At the same time, the temperature sensor 42 and the circuit board 41 are both arranged on the end cover 2, which is convenient for the assembly and installation of the temperature detection module 40 and the end cover 2.

[0056] The temperature sensor 42 may be an NTC sensor.

[0057] The above-mentioned NTC sensor, also known as NTC thermistor, uses semiconductor materials such as metal oxides to respond to temperature changes by exhibiting a significant change in resistance. When the temperature increases, the resistance in the NTC thermistor decreases, a characteristic derived from its inherent material properties. This response to temperature changes of this NTC sensor is critical for applications that require rapid thermal detection, such as temperature detection of the wire cup 11 of the stator 10 in a hollow cup motor.

[0058] It should be noted that the temperature sensor 42 may also be a PT100 sensor. The PT100 sensor uses resistance temperature detection technology to provide accurate temperature measurement. The PT100 sensor is made of platinum because it has reliable resistance characteristics over a wide temperature range, making it very suitable for various industrial environments. The inherent stability and resistance to chemical degradation of platinum enhance the durability and consistency of the PT100 sensor, minimizing the need for frequent recalibration or replacement.

[0059] like Figure 3 and Figure 5 As shown, in some embodiments, the circuit board 41 includes a flexible circuit board 411 and a rigid circuit board 412, and the stator 10 is electrically connected to the flexible circuit board 411. Specifically, the coil 12 in the stator 10 is electrically connected to the flexible circuit board 411; the flexible circuit board 411 is annular, and the flexible circuit board 411 is located between the first end surface 110 and the rigid circuit board 412; the temperature sensor 42 passes through the flexible circuit board 411 and the connection end 402 of the temperature sensor 42 is electrically connected to the flexible circuit board 411.

[0060] The above-mentioned rigid circuit board 412 refers to a conventional circuit board 41 in a broad sense, referred to as PCB.

[0061] The flexible circuit board 411, referred to as FPCB, refers to a circuit board 41 that can be deformed under the action of an external force. The flexible circuit board 411 is annular, so that the temperature sensor 42 can be set at any position on the flexible circuit board, that is, one or more temperature sensors 42 can be set along the circumference of the flexible circuit board 411 as needed.

[0062] By passing the temperature sensor 42 through the flexible circuit board 411 and electrically connecting the connection end 402 to the flexible circuit board 411, relying on the characteristic of the flexible circuit board 411 to deform under the action of external force, when the wire cup 11 of the stator 10 shakes during the operation of the hollow cup motor, the temperature sensor 42 in contact with the wire cup 11 can also move accordingly while ensuring contact with the first end face 110 of the wire cup 11, thereby reducing the probability of damage to the temperature sensor 42 during the operation shaking process, thereby improving the reliability and detection accuracy of the temperature detection module 40.

[0063] It should be noted that the rigid circuit board 412 and the flexible circuit board 411 may be electrically connected via a connecting cable 413. Figure 3 Alternatively, the rigid circuit board 412 and the flexible circuit board 411 may also be electrically connected by connecting wires or guide pins, which is not specifically limited here.

[0064] like Figure 5 As shown, the orthographic projection of the flexible circuit board 411 on the stator 10 covers the first end surface 110. In this way, the positioning of the temperature sensor 42 is facilitated, and the assembly accuracy of the coreless motor is improved.

[0065] like Figure 5 and Figure 6 As shown, the end cap 2 is provided with an encoder 50, and the rigid circuit board 412 is electrically connected to the flexible circuit board 411 and the encoder 50 on the one hand, and on the other hand, after being connected with the end cap 2, it plays the role of sealing the opening 101 of the body 1. In some embodiments, the encoder 50 and the rigid circuit board 412 are an integrated structure. In this way, the number of parts of the hollow cup motor is reduced, which is conducive to improving the assembly efficiency of the hollow cup motor.

[0066] It should be noted that the encoder 50 is connected between the rotor 20 and the controller, and the rotation speed of the rotor 20 of the coreless motor is controlled by the controller. The encoder 50 may be, but is not limited to, an encoder chip disposed on the rigid circuit board 412 .

[0067] like Figure 3 As shown, on the other hand, a through hole 410 is provided on the rigid circuit board 412, and the through hole 410 is used to electrically connect the flexible circuit board 411 with an external device. In this way, it is convenient for the temperature sensor 42 to be electrically connected to the external device through the flexible circuit board 411 and the rigid circuit board 412. The external device can be a controller.

[0068] like Figure 3 and Figure 8As shown, in order to reduce the vibration at the connection between the rotor 20 and the end cover 2 of the hollow cup motor during operation, in some embodiments, a buffer member 3 is connected between the hole wall of the avoidance hole 201 of the end cover 2 and the outer wall of the second bearing 32.

[0069] During the operation of the motor, shaking will occur between the components, because it is the connection between the second bearing 32 and the end cover 2. By arranging the buffer 3 between the second bearing 32 and the end cover 2, the buffer 3 can play a buffering role. In this way, during the operation of the hollow cup motor, the buffer 3 can buffer the vibration between the second bearing 32, the rotating shaft 21 and the end cover 2, which can play a shock-absorbing role to a certain extent, improve the working stability of the hollow cup motor, and thus extend the service life of the hollow cup motor.

[0070] like Figure 8 As shown, in some embodiments, a groove 202 is formed on the wall of the avoidance hole 201 , and the groove 202 extends circumferentially of the avoidance hole 201 . The buffer 3 is an O-ring, and the diameter of the buffer 3 is greater than the depth or width of the groove 202 .

[0071] The above-mentioned O-ring is the abbreviation of O-ring sealing ring. The O-ring is arranged between the outer wall of the second bearing 32 and the avoidance hole 201 of the end cover 2, which can not only play a role in buffering and shock absorption, but also the diameter of the buffer 3 is greater than the groove depth or groove width of the groove 202. That is to say, when the buffer 3 is arranged in the groove 202 and assembled with the second bearing 32, the buffer 3 is squeezed to cause it to deform, that is, the buffer 3 and the outer wall of the second bearing 32 are interference fit. At this time, the outer wall of the second bearing 32 is subjected to the elastic force generated by the extrusion deformation of the buffer 3. In this way, the second bearing 32 is fixed in the avoidance hole 201, which plays a role of connection and sealing.

[0072] Through the above arrangement, the buffer member 3 plays a shock-absorbing role and improves the connection reliability between the second bearing 32 and the end cover 2. At the same time, it not only improves the sealing of the connection between the second bearing 32 and the end cover 2, but also the O-ring has good oil resistance and can effectively reduce the noise generated by the hollow cup motor during operation.

[0073] like Figure 8 As shown, in some embodiments, a spring 4 is disposed in the avoidance hole 201, and a stop flange 203 is connected to one end of the avoidance hole 201 away from the first end face 110, and the spring 4 is compressed between the second bearing 32 and the stop flange 203. That is, during the assembly process of the second bearing 32 and the end cover 2, the spring 4 is first placed in the avoidance hole 201 of the end cover 2, and then the second bearing 32 is placed in the avoidance hole 201, and the end face of the second bearing 32 squeezes the spring 4 to deform it.

[0074] Through the above arrangement, after the second bearing 32 is assembled with the end cover 2, the rotor 20, etc., the second end cover 2 is subjected to the elastic force of the spring 4, which reduces the probability of the second bearing 32 moving relative to the rotor 20 along the axis of the rotor 20 during the operation of the hollow cup motor, further reduces vibration and noise, and thus improves the reliability of the hollow cup motor.

[0075] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A coreless motor, characterized in that: include: Body (1); An end cover (2) is arranged on the machine body (1); A stator (10) is arranged in the machine body (1); A rotor (20) is arranged in the machine body (1), the rotor (20) is inserted into the interior of the stator (10), and two ends of the rotor (20) are rotatably connected to the machine body (1) and the end cover (2) via bearings (30) respectively; A temperature detection module (40) is arranged on the end cover (2), and the temperature detection module (40) has a sensing portion (401), and the sensing portion (401) is in contact with a first end surface (110) of the stator (10) close to the end cover (2).

2. The coreless motor according to claim 1, characterized in that: The stator (10) comprises a wire cup (11) and a coil (12) wound around the outside of the wire cup (11); an end surface of the wire cup (11) close to the end cover (2) is the first end surface (110).

3. The coreless motor according to claim 1, characterized in that: The temperature detection module (40) comprises a circuit board (41) and a temperature sensor (42) arranged on the end cover (2); the stator (10) is electrically connected to the circuit board (41); an end of the temperature sensor (42) close to the first end surface (110) is the sensing portion (401); and a connection end (402) of the temperature sensor (42) away from the sensing portion (401) is electrically connected to the circuit board (41).

4. The coreless motor according to claim 3, characterized in that: The circuit board (41) comprises a flexible circuit board (411) and a rigid circuit board (412), and the rigid circuit board (412) is electrically connected to the flexible circuit board (411); the flexible circuit board (411) is ring-shaped, and the flexible circuit board (411) is located between the first end surface (110) and the rigid circuit board (412); The temperature sensor (42) passes through the flexible circuit board (411), and the connection end (402) is electrically connected to the flexible circuit board (411).

5. The coreless motor according to claim 4, characterized in that: The stator (10) comprises a wire cup (11) and a coil (12) wound around the outside of the wire cup (11); an end surface of the wire cup (11) close to the end cover (2) is the first end surface (110); The orthographic projection of the flexible circuit board (411) on the stator (10) covers the first end surface (110); And / or, the coil (12) is electrically connected to the flexible circuit board (411).

6. The coreless motor according to claim 4, characterized in that: An encoder (50) is provided on the end cover (2), and the encoder (50) and the rigid circuit board (412) are an integrated structure; And / or, the rigid circuit board (412) is provided with a through hole (410), and the through hole (410) is used for electrically connecting the flexible circuit board (411) with an external device.

7. The coreless motor according to any one of claims 3 to 6, characterized in that: The temperature sensor (42) is an NTC sensor.

8. The coreless motor according to any one of claims 1 to 6, characterized in that: The bearing (30) connected to the machine body (1) is a first bearing (31), and the bearing (30) connected to the end cover (2) is a second bearing (32); The end cover (2) is provided with a relief hole (201), the relief hole (201) being used to arrange the rotor (20) and the second bearing (32), and the hole wall of the relief hole (201) and the outer wall of the second bearing (32) are connected via a buffer member (3).

9. The coreless motor according to claim 8, characterized in that: The hole wall of the avoidance hole (201) is provided with a groove (202), the groove (202) extending along the circumference of the avoidance hole (201), the buffer component (3) is an O-ring, and the diameter of the buffer component (3) is greater than the groove depth or groove width of the groove (202).

10. The coreless motor according to claim 8, characterized in that: A spring (4) is arranged in the avoidance hole (201), and one end of the avoidance hole (201) away from the first end surface (110) is connected to a stop flange (203), and the spring (4) is compressed between the second bearing (32) and the stop flange (203).

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