Brake and motor

Abstract

The application relates to a brake and a motor. The brake comprises a rack, a friction piece and a limiting assembly. The rack is used for being rotationally connected with a rotor shaft. The friction piece is used for being connected with the rotor shaft, and the friction piece rotates synchronously with the rotor shaft. The position of the friction piece relative to the rotor shaft is fixed along the axial direction of the rotor shaft. The limiting assembly comprises a driving piece and a limiting piece. The driving piece is installed on the rack, and the limiting piece is connected with the driving piece. The limiting assembly is arranged on both sides of the friction piece along the axial direction. Under the driving of the driving piece, the two groups of limiting pieces can synchronously approach and move away from the friction piece to clamp the friction piece or separate the friction piece from the limiting piece. The brake is realized by the movement of the two groups of limiting pieces relative to the friction piece, and the friction piece does not need to move along the axial direction and resist the limiting assembly. Therefore, the position of the friction piece relative to the rotor shaft is fixed along the axial direction, the friction piece is not easy to move along the axial direction, the friction piece is not easy to collide with the limiting piece, the generation of dust is reduced, and the overall performance of the device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electromechanical technology, in particular to a brake and a motor. BACKGROUND

[0002] The electromagnetic brake is an important mechanical basic part, which integrates mechanical, electrical and electronic technologies, and is mainly used for precise control and braking of rotating mechanisms (such as motor devices, etc.). The electromagnetic brake can be installed in a servo motor. When the servo motor works, the armature of the electromagnetic brake is attracted away, so that the friction piece is separated from the armature. At this time, the distance between the armature and the baffle is larger, and the friction piece will produce axial movement when rotating with the rotating shaft, which is easy to collide with the armature or the baffle, at this time, there will be slight friction, and the dust generated in the friction process will enter the encoder, which will affect the accuracy of the encoder and thus the overall performance of the motor. SUMMARY

[0003] Therefore, it is necessary to provide a brake aiming at the technical problem that the axial movement of the friction piece during the working process of the electromagnetic brake causes friction and dust.

[0004] A brake, comprising:

[0005] A rack for being rotatably connected with a rotor shaft;

[0006] A friction piece for being connected with the rotor shaft, and the friction piece can rotate synchronously with the rotor shaft, and the position of the friction piece relative to the rotor shaft is fixed along the axial direction of the rotor shaft;

[0007] A limiting assembly comprising a driving piece and a limiting piece, the driving piece is installed on the rack, the limiting piece is connected to the power output end of the driving piece, and the friction piece is provided with the limiting assembly on both sides along the axial direction;

[0008] Under the driving of the two groups of driving pieces, the two groups of limiting pieces can move synchronously towards or away from the friction piece along the axial direction, so as to clamp or separate the friction piece.

[0009] In one embodiment, at least one of the driving pieces comprises a driving coil, and the driving coil is used to attract the limiting piece in the energized state, so as to make the limiting piece move away from the friction piece along the axial direction.

[0010] In one embodiment, the limiting assembly further comprises a resilient piece, one end of the resilient piece is connected to the rack, and the other end is connected to the limiting piece, and the resilient piece is used to apply a force to the limiting piece towards the friction piece, so that the limiting piece moves towards the friction piece in the de-energized state and abuts against the friction piece.

[0011] In one of the embodiments, each of the driving members comprises the driving coil, and each of the driving coils is used to attract the limiting member in the energized state.

[0012] In one of the embodiments, the friction member is sleeved on the rotor shaft, and the friction member is in interference fit with the rotor shaft.

[0013] In one of the embodiments, the frame comprises a base, each of the limiting assemblies is provided with the base away from one side of the friction member, the driving member is mounted on the base, and the brake further comprises a rotating member arranged between the base and the friction member.

[0014] The rotating member is abutted against the base and the friction member on the opposite sides in the axial direction, so that the position of the friction member in the axial direction relative to the rotor shaft is fixed, and the friction member can rotate relative to the base through the rotating member during the rotation of the rotor shaft.

[0015] In one of the embodiments, the rotating member comprises at least two rolling balls arranged at intervals along the circumference of the rotor shaft, the rolling balls are arranged between the base and the friction member, the rolling balls are located outside the rotor shaft in the radial direction of the rotor shaft, one side of the friction member facing the rolling balls is provided with an annular groove, the rolling balls are contained in the annular groove, and the rolling balls are abutted against the base and the friction member on the opposite sides in the axial direction, the rolling balls rotate relative to the base and the friction member in the annular groove during the rotation of the friction member with the rotor shaft.

[0016] In one of the embodiments, the brake further comprises a locking member, the locking member penetrates one of the bases in the axial direction and is connected with the other base, so as to limit the relative position of the two bases in the axial direction.

[0017] In one of the embodiments, the brake further comprises a non-circular member, the non-circular member is sleeved on the rotor shaft, and the non-circular member is fixedly connected with the rotor shaft, the friction member is provided with a non-circular groove, and the non-circular member is inserted into the non-circular groove in the axial direction, so as to limit the relative rotation of the rotor shaft and the friction member.

[0018] The application further provides an electric machine capable of solving at least one of the above technical problems.

[0019] An electric machine comprises the brake described above.

[0020] Advantages:

[0021] The brake provided by the embodiment of the present application comprises a rack, a friction piece and a limiting assembly, the rack is used for being rotationally connected with a rotor shaft, the friction piece is used for being connected with the rotor shaft, and the friction piece can synchronously rotate with the rotor shaft, the position of the friction piece relative to the rotor shaft is fixed along the axial direction of the rotor shaft, the limiting assembly comprises a driving piece and a limiting piece, the driving piece is installed on the rack, the limiting piece is connected to the power output end of the driving piece, and the friction piece is provided with the limiting assembly on both sides along the axial direction; under the driving of the two driving pieces, the two limiting pieces can synchronously approach or move away from the friction piece along the axial direction, so as to clamp the friction piece or separate the friction piece relative to the friction piece. Specifically, in the power-off state, the two limiting assemblies synchronously approach the friction piece along the axial direction, so that the two limiting assemblies clamp the friction piece. The relative position of the friction piece and the rotor shaft along the axial direction is fixed, therefore, when the two limiting assemblies clamp the friction piece, the limiting assembly will hinder the rotation of the friction piece and the rotor shaft, so that the rotor shaft cannot operate. Therefore, the braking mode of the present scheme is realized by the movement of the two limiting pieces relative to the friction piece, in this process, the friction piece does not need to move along the axial direction and resist the limiting assembly to realize the braking of the rotor shaft, based on this, the position of the friction piece relative to the rotor shaft along the axial direction is fixed, therefore, in the process of synchronously rotating with the rotor shaft, the friction piece is not easy to move along the axial direction, so that the friction piece is not easy to collide with the limiting pieces on both sides of the friction piece along the axial direction, thereby the generation of dust can be reduced, and the overall performance of the device can be improved.

[0022] The motor provided by the present application comprises the above brake, and at least one of the above technical effects can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A sectional view of the motor provided by the embodiment of the present application;

[0024] Figure 2 A schematic view of the motor provided by the embodiment of the present application;

[0025] Figure 3 A sectional view of the brake provided by the embodiment of the present application;

[0026] Figure 4 A top view of the friction piece in the brake provided by the embodiment of the present application;

[0027] Figure 5 A schematic view of the rotor shaft in the brake provided by the embodiment of the present application.

[0028] REFERENCE NUMERALS:

[0029] 110 - base; 120 - housing; 210 - friction member; 211 - non-circular groove; 212 - fitting part; 213 - friction part; 214 - annular groove; 220 - ball; 300 - limiting assembly; 310 - driving coil; 320 - limiting member; 330 - elastic member; 400 - rotor shaft; 410 - non-circular member; 500 - locking member; 520 - abutting block; 530 - stator; 540 - rotor core. DETAILED DESCRIPTION

[0030] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a variety of ways other than those described herein without departing from the spirit of the present application, and it is understood that similar modifications will be made by those skilled in the art in the light of the above teachings. Therefore, the present application is not limited to the following embodiments disclosed below but can be implemented in many different ways.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely used for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0032] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or a specific number of the technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0033] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing", and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or can be integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature is "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature is "under", "below" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0035] It should be noted that when an element is referred to as being "fixed to" or "set to" another element, it can be directly on the other element or there can be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be an intermediate element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0036] Referring to Figure 1 and Figure 2 ,

[0037] Figure 1 A cross-sectional view of a motor provided for an embodiment of the present application; Figure 2 A schematic view of a motor provided for an embodiment of the present application; Figure 3 A cross-sectional view of a brake provided for an embodiment of the present application. The brake provided by an embodiment of the present application comprises a frame, a friction piece 210 and a limiting assembly 300, the frame is used to be rotationally connected with a rotor shaft 400; the friction piece 210 is used to be connected with the rotor shaft 400, and the friction piece 210 can synchronously rotate with the rotor shaft 400, and the position of the friction piece 210 relative to the rotor shaft 400 is fixed along the axial direction of the rotor shaft 400; the limiting assembly 300 comprises a driving piece and a limiting piece 320, the driving piece is installed on the frame, the limiting piece 320 is connected to the power output end of the driving piece, and the friction piece 210 is provided with the limiting assembly 300 on both sides in the axial direction; under the driving of the two groups of driving pieces, the two groups of limiting pieces 320 can synchronously approach or move away from the friction piece 210 in the axial direction, so as to clamp or separate the friction piece 210 relative to the friction piece 210.

[0038] Specifically, in the power-on state, the two limiting assemblies 300 are synchronously away from the friction piece 210 along the axial direction, so that the limiting assemblies 300 are separated from the friction piece 210. And the relative position between the friction piece 210 and the rotor shaft 400 along the axial direction is fixed, so when the limiting assemblies 300 are separated from the friction piece 210, the limiting assemblies 300 will no longer hinder the rotation of the friction piece 210 and the rotor shaft 400, so that the rotor shaft 400 can operate normally. In the power-off state, the two limiting assemblies 300 are synchronously close to the friction piece 210 along the axial direction, so that the two limiting assemblies 300 clamp the friction piece 210. And the relative position between the friction piece 210 and the rotor shaft 400 along the axial direction is fixed, so when the two limiting assemblies 300 clamp the friction piece 210, the limiting assemblies 300 will hinder the rotation of the friction piece 210 and the rotor shaft 400, so that the rotor shaft 400 cannot operate. Therefore, from the above embodiment, it can be known that the braking mode of the scheme is realized by the synchronous closing or moving away of the two groups of limiting pieces 320 relative to the friction piece 210. In this process, the friction piece 210 does not need to move along the axial direction and resist the limiting assemblies 300 to realize the braking of the rotor shaft 400. Based on this, the position of the friction piece 210 relative to the rotor shaft 400 along the axial direction is fixed, so that the friction piece 210 is not easy to move along the axial direction during the synchronous rotation with the rotor shaft 400, so that the friction piece 210 is not easy to collide with the limiting pieces 320 on both sides of the friction piece 210 along the axial direction, thereby reducing the generation of dust and improving the overall performance of the device.

[0039] It should be noted that the axial direction mentioned in the present application refers to the axial direction of the rotor shaft 400. For the sake of description, the axial direction is used in the following description.

[0040] Referring to Figure 1 In one embodiment, at least one of the driving pieces includes a driving coil 310, which is used to attract the limiting piece 320 in the power-on state, so that the limiting piece 320 moves away from the friction piece 210 along the axial direction.

[0041] Specifically, the driving coil 310 is located on the side of the limiting piece 320 away from the friction piece 210. In the power-on state, the driving coil 310 can generate magnetism, thereby attracting the limiting piece 320, so that the limiting piece 320 can move away from the friction piece 210 along the axial direction, thereby having a gap between the limiting assembly 300 and the friction piece 210. The limiting piece 320 can be a armature or other ferromagnetic material, as long as it can be attracted by the driving coil 310 in the power-on state.

[0042] In one embodiment, the two driving pieces are both driving coils 310.

[0043] Specifically, in the powered state, the two drive coils 310 can generate magnetic force to attract the limiting member 320, so that the limiting member 320 can move away from the friction member 210 in the axial direction, so that the limiting assembly 300 and the friction member 210 have a gap.

[0044] Preferably, in some embodiments, the magnetic attraction generated by the two drive coils 310 in the powered state is equal.

[0045] Specifically, the two drive coils 310 are respectively located on both sides of the friction member 210 in the axial direction. In the powered state, the friction member 210 will be subjected to opposite attractive forces of the two drive coils 310. Since the magnetic attraction generated by the two drive coils 310 in the powered state is equal, the attractive forces of the two drive coils 310 on the friction member 210 can be approximately canceled out, so that the friction member 210 can be prevented from colliding with the limiting member 320 due to the force in the axial direction.

[0046] In other embodiments, at least one of the drive members can also be a pneumatic cylinder or the like, as long as it can drive the limiting member 320.

[0047] In the following embodiments, both of the drive members shown in the drawings will be described by using the drive coil 310.

[0048] Continuing to refer to Figure 3 In one embodiment, the limiting assembly 300 further includes an elastic member 330. One end of the elastic member 330 is connected to the frame, and the other end is connected to the limiting member 320. The elastic member 330 is used to apply a force to the limiting member 320 towards the friction member 210, so that in the de-energized state, the limiting member 320 moves towards the friction member 210 and abuts against the friction member 210.

[0049] Specifically, in the de-energized state, since the drive coil 310 no longer provides the limiting member 320 with the attractive force away from the friction member 210, under the action of the elastic force applied by the elastic member 330, the limiting member 320 can move towards the friction member 210 and abut against the friction member 210. When both sides are driven by the drive coil 310, both limiting members 320 abut against the friction member 210, thereby clamping the friction member 210. In other embodiments, when the drive member is a pneumatic cylinder or the like, the limiting member 320 is driven by the pneumatic cylinder to move towards the friction member 210, and at the same time, the elastic member 330 can play an auxiliary role, so that the limiting member 320 can stably move towards the friction member 210 to achieve clamping of the friction member 210. Preferably, the elastic member 330 is a spring.

[0050] Still referring to Figure 1In one of the embodiments, each of the two driving members comprises a driving coil 310, and each of the two driving coils 310 is used to attract the limiting member 320 in the energized state, and the magnetic attraction force generated by the two driving coils 310 in the energized state is equal.

[0051] It should be noted that the force applied by the elastic member 330 to the limiting member 320 towards the friction member 210 is smaller than the attraction force of the driving coil 310 to the limiting member 320 in the energized state, so that the limiting member 320 can still move away from the friction member 210 in the axial direction in the energized state.

[0052] Referring to Figure 1 , Figure 2 and Figure 3 In one of the embodiments, the friction member 210 is sleeved on the rotor shaft 400, and the friction member 210 is in interference fit with the rotor shaft 400.

[0053] Specifically, the friction member 210 is in interference fit with the rotor shaft 400, so that the friction member 210 can rotate synchronously with the rotor shaft 400, and the axial position of the friction member 210 relative to the rotor shaft 400 is fixed, so that the friction member 210 will not move in the axial direction during the synchronous rotation of the friction member 210 with the rotor shaft 400, and thus will not collide with the limiting member 320, thereby reducing the generation of dust. In other embodiments, the friction member 210 and the rotor shaft 400 can also be in clearance fit.

[0054] Referring to Figure 1 and Figure 2 In one of the embodiments, the frame comprises a base 110, and the two limiting assemblies 300 are provided with the base 110 away from the friction member 210, and the driving member is installed on the base 110. The brake further comprises a rotating member, which is arranged between the base 110 and the friction member 210. The rotating member is in abutment with the base 110 and the friction member 210 on the opposite sides in the axial direction, so that the position of the friction member 210 relative to the rotor shaft 400 in the axial direction is fixed, and the friction member 210 can rotate relative to the base 110 through the rotating member during the rotation of the rotor shaft 400.

[0055] Specifically, the elastic member 330 is connected to the corresponding base 110 on the side of the corresponding limiting assembly 300 away from the friction member 210. The frame is rotationally connected to the rotor shaft 400, and the axial position of the frame relative to the rotor shaft 400 is fixed. Since the frame includes the base 110, the axial position of the base 110 relative to the rotor shaft 400 is fixed. Since the axial position of the base 110 relative to the rotor shaft 400 is fixed, the side of the base 110 close to the limiting assembly 300 abuts against the rotating member, and the two ends of the rotating member are abutted against the base 110 and the friction member 210, respectively. Since the rotating member is arranged between the base 110 and the friction member 210, and the friction member 210 is provided with the base 110 on both sides in the axial direction, the friction member 210 is provided with the rotating member on both sides in the axial direction, the axial position of the base 110 relative to the rotor shaft 400 is fixed, the two ends of the rotating member are abutted against the base 110 and the friction member 210, respectively, and the two bases 110 abut the rotating member and the friction member 210 in the axial direction, so that the axial position of the friction member 210 relative to the rotor shaft 400 is relatively fixed, and the friction member 210 will not axially move relative to the rotor shaft 400 during the rotation of the friction member 210 with the rotor shaft 400.

[0056] Since the rotating member can rotate relative to the base 110, the base 110 will not interfere with the rotation of the friction member 210 during the synchronous rotation of the friction member 210 with the rotor shaft 400, and thus will not affect the rotation of the rotor shaft 400. When the friction member 210 is clearance-fitted relative to the rotor shaft 400, the rotating member is clamped by the two bases 110, and thus the friction member 210 is clamped, which can facilitate the installation of the friction member 210. When the friction member 210 is interference-fitted relative to the rotor shaft 400, the rotating member is clamped by the two bases 110, and thus the friction member 210 is clamped, which can further ensure the axial position of the friction member 210 relative to the rotor shaft 400.

[0057] Referring to Figure 1 , Figure 2 , Figure 4 , Figure 4 is a top view of the friction member in the brake provided by the embodiment of the application. In one of the embodiments, the rotating member includes at least two balls 220 arranged at intervals in the circumferential direction of the rotor shaft 400, the balls 220 are arranged between the base 110 and the friction member 210, the balls 220 are located outside the rotor shaft 400 in the radial direction of the rotor shaft 400, the side of the friction member 210 facing the balls 220 is provided with an annular groove 214, the balls 220 are contained in the annular groove 214, and the opposite sides of the balls 220 in the axial direction are abutted against the base 110 and the friction member 210, respectively. During the rotation of the friction member 210 with the rotor shaft 400, the balls 220 rotate in the annular groove 214 relative to the base 110 and the friction member 210.

[0058] Specifically, the two opposite sides of the rolling ball 220 in the axial direction are respectively abutted to the base 110 and the friction piece 210, and in the process of rotating the friction piece 210 with the rotor shaft 400, the rolling ball 220 can rotate in the annular groove 214 relative to the base 110 and the friction piece 210, so that the base 110 does not interfere with the rotation of the friction piece 210 in the state of abutting the rolling ball 220, so that the friction piece 210 can rotate synchronously with the rotor shaft 400, thereby not interfering with the rotation of the rotor shaft 400. Since the rolling ball 220 is contained in the annular groove 214, the rolling ball 220 always remains in the annular groove 214 in the process of rotating the rolling ball 220, so that the two opposite sides of the rolling ball 220 in the axial direction are respectively abutted to the base 110 and the friction piece 210, so that the friction piece 210 can be clamped.

[0059] Further, the included angle of at least two rolling balls 220 is greater than 90 degrees, so that at least one quarter of the friction piece 210 is supported by the rolling ball 220, thereby increasing the stability of the friction piece 210, so that the friction piece 210 can be clamped stably. Preferably, the included angle of at least two rolling balls 220 is 180 degrees, so that at least half of the friction piece 210 is supported by the rolling ball 220, thereby further increasing the stability of the friction piece 210, so that the friction piece 210 can be clamped stably.

[0060] Wherein, the number of rolling balls 220 can also be multiple, as long as it can realize that the rolling ball 220 can support the base 110, and the friction piece 210 can always be clamped. It should be noted that the rolling ball 220 will move a certain distance along the circumferential direction of the friction piece 210 in the process of rotation. We assume that the moving distance and direction of all rolling balls 220 are the same, that is, the relative position of the rolling balls 220 along the circumferential direction of the friction piece 210 remains unchanged during the entire process, thereby avoiding the condition that the friction piece 210 cannot be clamped due to the accumulation of the rolling balls 220.

[0061] In other embodiments, the rotating member can be a thrust ball bearing, the thrust ball bearing is sleeved on the rotor shaft 400, the thrust ball bearing abuts to the base 110 and the friction piece 210 along the two sides in the axial direction, and in the process of rotating the friction piece 210 with the rotor shaft 400, the friction piece 210 can rotate relative to the base 110.

[0062] In one embodiment, the friction member 210 is ring-shaped and is sleeved on the rotor shaft 400, and the corresponding limiting member 320 is also ring-shaped and is sleeved on the rotor shaft 400, so that when the two limiting members 320 clamp the friction member 210, the contact area between the limiting member 320 and the friction member 210 is increased, the friction force is increased, and the braking effect of the brake on the rotor shaft 400 is improved. In other embodiments, the friction member 210 can also be triangular, as long as it can be clamped by the two limiting members 320 to brake the rotor shaft 400.

[0063] Further, the driving coil 310 is ring-shaped, and the base 110 is provided with a ring-shaped mounting cavity, and the driving coil 310 is mounted in the mounting cavity, so that in the energized state, the adsorption coil can provide uniform adsorption force to the limiting member 320, so that the limiting member 320 moves towards the coil. Among them, in the radial direction of the rotor shaft 400, the size of the limiting member 320 is larger than the size of the mounting cavity, so as to axially limit the limiting member 320 during the close movement of the limiting member 320 relative to the driving coil 310. Specifically, in the energized state, when the limiting member 320 moves close to the driving coil 310 under the adsorption force of the driving coil 310, after moving to a certain distance, the limiting member 320 will be blocked by the base 110, and the limiting member 320 will be partially inserted into the mounting cavity to collide and damage the driving coil 310.

[0064] Referring to Figure 1 In one embodiment, the friction member 210 includes a friction portion 213 and a matching portion 212, the friction portion 213 is located on the outer side of the matching portion 212 in the radial direction, and the friction portion 213 is in clamping cooperation with the matching portion 212, the ring-shaped groove 214 and the non-circular groove 211 are arranged on the matching portion 212, and the two limiting members 320 can clamp the friction portion 213.

[0065] Further, the matching portion 212 is made of a metal material with high surface smoothness, such as bearing steel, so that the friction force between the ball 220 and the matching portion 212 is smaller when the ball 220 rotates in the ring-shaped groove 214 during rotation. The friction portion 213 is a high polymer material with rough surface, such as asbestos resin type friction material, so that when the two limiting members 320 clamp the friction portion 213, the limiting member 320 and the friction portion 213 have a larger friction force, thereby braking the rotor shaft 400. In other embodiments, the friction portion 213 and the matching portion 212 can be integrally formed.

[0066] Referring to Figure 1 , Figure 2 , Figure 4 and Figure 5 , Figure 5The schematic view of the rotor shaft in the brake is provided in the embodiment of the present application. In one of the embodiments, the brake further comprises a non-circular piece 410, the non-circular piece 410 is sleeved on the rotor shaft 400, and the non-circular piece 410 is fixedly connected with the rotor shaft 400, the friction piece 210 is provided with a non-circular groove 211, and the non-circular piece 410 is axially inserted into the non-circular groove 211, so as to limit the relative rotation of the rotor shaft 400 and the friction piece 210.

[0067] Specifically, the friction piece 210 can be connected to the rotor shaft 400 and the relative rotation of the rotor shaft 400 and the friction piece 210 can be limited by axially inserting the non-circular piece 410 into the matching groove. Since the position of the friction piece 210 in the axial direction is fixed relative to the rotor shaft 400, the rotor shaft 400 cannot rotate in the state that the two limiting pieces 320 clamp the friction piece 210, so that the rotor shaft 400 is accurately braked.

[0068] Referring to Figure 1 and Figure 2 In one of the embodiments, the brake further comprises a locking piece 500, the locking piece 500 passes through one of the bases 110 in the axial direction and is connected with the other base 110, so as to limit the relative position of the two bases 110 in the axial direction.

[0069] Specifically, the relative position of the two bases 110 in the axial direction is limited by passing the locking piece 500 through one of the bases 110 and connecting it with the other base 110, so that the two bases 110 keep clamping the balls 220, and the axial position of the friction piece 210 between the balls 220 relative to the rotor shaft 400 is always fixed. The locking piece 500 can be a bolt, one end of the bolt passes through one of the bases 110 and is threadedly connected with the other base 110.

[0070] Further, the brake further comprises an abutting block 520, one end of the abutting block 520 abuts against one of the bases 110, and the other end abuts against the other base 110, so as to better limit the distance of the two bases 110 in the axial direction, and further limit the abutting force of the base 110 on the balls 220, so as to avoid that the balls 220 cannot rotate relative to the base 110 and the friction piece 210 when the abutting force is too large, and avoid that the friction piece 210 cannot be stably clamped when the abutting force is too small.

[0071] Referring to Figure 1 and Figure 2 The motor provided in the embodiment of the present application comprises the above brake.

[0072] Specifically, in the power-on state, the driving coil 310 adsorbs the limiting piece 320, so that the two limiting pieces 320 are away from the friction piece 210, and the limiting piece 320 has a gap with the friction piece 210, and since the friction piece 210 is clamped by the two bases 110 through the ball 220, the position of the friction piece 210 and the rotor shaft 400 in the axial direction is fixed, so that the friction piece 210 cannot move relatively in the axial direction, thereby avoiding friction between the friction piece 210 and the limiting piece 320, reducing the generation of dust, thereby reducing the dust entering the encoder, improving the accuracy of the encoder, and improving the overall performance of the motor.

[0073] In the power-off state, the limiting piece 320 is acted on by the elastic piece 330, so that the two limiting pieces 320 move towards the friction piece 210 and clamp the friction piece 210, thereby limiting the rotation of the friction piece 210, and since the position of the friction piece 210 and the rotor shaft 400 in the axial direction is fixed, the rotation of the rotor shaft 400 is limited, and the rotor shaft 400 is braked.

[0074] Further, the motor further comprises a rotor shaft 400, a stator 530, a rotor core 540 and a machine shell 120, the stator 530 is installed on the machine shell 120, the rotor core 540 is sleeved on the rotor shaft 400, the machine shell 120 is rotatably connected with the rotor shaft 400 through a bearing, and the rotor shaft 400 rotates through the magnetic attraction force exerted by the energized coil in the stator 530 on the rotor core 540. One of the bases 110 is installed on the machine shell 120, so that the position of the brake in the axial direction is fixed relative to the rotor shaft 400, thereby ensuring that the position of the friction piece 210 in the axial direction is fixed relative to the rotor shaft 400.

[0075] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combinations of the technical features do not contradict, they should be considered within the scope of the present disclosure.

[0076] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A brake, characterized in that: include: a frame, for rotationally connecting with the rotor shaft; a friction member, configured to be connected to the rotor shaft and capable of rotating synchronously with the rotor shaft, wherein the position of the friction member relative to the rotor shaft is fixed along the axial direction of the rotor shaft; a limiting assembly comprising a driving member and a limiting member, wherein the driving member is mounted on the frame, the limiting member is connected to the power output end of the driving member, and the limiting assembly is provided on both sides of the friction member along the axial direction; Under the drive of the two groups of driving members, the two groups of limiting members can synchronously move closer to or farther away from the friction member along the axial direction to clamp the friction member or separate the friction member from the friction member; The friction member is sleeved on the rotor shaft; The frame includes a base, and the base is provided on one side of the two limiting assemblies away from the friction member. The driving member is mounted on the base. The brake further includes a rotating member, and the rotating member is provided between the base and the friction member. The rotating member abuts against the base and the friction member on opposite sides in the axial direction, so that the position of the friction member relative to the rotor shaft in the axial direction is fixed, and during the rotation of the rotor shaft, the friction member can rotate relative to the base through the rotating member.

2. The brake according to claim 1, characterized in that At least one of the driving members includes a driving coil, and the driving coil is used to attract the limiting member when powered, so that the limiting member moves away from the friction member along the axial direction.

3. The brake according to claim 2, characterized in that The limiting assembly also includes an elastic member, one end of which is connected to the frame, and the other end is connected to the limiting member. The elastic member is used to apply a force to the limiting member toward the friction member so that in a power-off state, the limiting member moves toward the friction member and abuts against the friction member.

4. The brake according to claim 3, characterized in that The two driving members both include the driving coil, and the two driving coils are used to adsorb the limiting member in a power-on state.

5. The brake according to claim 1, wherein: The friction member is interference fit with the rotor shaft.

6. The brake according to claim 1, wherein: The rotating member includes at least two balls arranged at intervals along the circumference of the rotor shaft. The balls are arranged between the base and the friction member. The balls are located on the radially outer side of the rotor shaft. An annular groove is provided on the friction member on a side facing the balls. The balls are accommodated in the annular groove, and the balls are respectively abutted against the base and the friction member on opposite sides in the axial direction. When the friction member rotates with the rotor shaft, the balls rotate relative to the base and the friction member in the annular groove.

7. The brake according to claim 1, wherein: The brake further includes a locking member, which passes through one of the bases along the axial direction and is connected to the other base to define the relative positions of the two bases in the axial direction.

8. The brake according to any one of claims 1 to 5, characterized in that: The brake also includes a non-circular part, which is sleeved on the rotor shaft and fixedly connected to the rotor shaft. A non-circular groove is provided on the friction part, and the non-circular part is inserted into the non-circular groove along the axial direction to limit the relative rotation between the rotor shaft and the friction part.

9. A motor, characterized in that: The brake comprises the brake according to any one of claims 1 to 8.

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