Motor end cover, servo motor and industrial robot

Abstract

The utility model discloses a motor end cover and a servo motor. The motor end cover comprises an end cover body and a mounting sleeve, the end cover body is provided with a bottom wall and a peripheral wall, the peripheral wall is arranged on the peripheral edge of the bottom wall, and the bottom wall is provided with a bearing seat; the mounting sleeve is connected with the bottom wall, the mounting sleeve is arranged in the circumferential direction of the bearing seat and extends in the axial direction of a rotating shaft of the servo motor, and the mounting sleeve is used for containing a brake stator of the servo motor so that the radial side face of the brake stator can be opposite to the inner wall of the mounting sleeve. According to the utility model, the heat dissipation area between the brake stator and the motor end cover is increased, the air gap between the brake stator and the motor end cover is reduced, the thermal resistance between the brake stator and the motor end cover is reduced, when the servo motor operates, the heat generated by the brake stator can be dissipated through the mounting sleeve and the bottom wall, and the service life of the servo motor is prolonged. The heat dissipation speed is improved, and the temperature rise of the brake stator is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a motor end cover, a servo motor and an industrial robot. Background Art

[0002] With the development of industrial production automation and intelligence, servo systems have been widely used in industrial production equipment due to their high control accuracy and fast response, and have gradually replaced the drive and stepper motor transmission control system. However, in the servo control system, due to the limitations of the working environment and size and weight, there are high requirements for the integration and power density of servo motors. Achieving good heat dissipation of the motor within a limited size is one of the key factors to ensure the efficiency of the motor, and it is also one of the key factors restricting the development of servo motors towards integration.

[0003] In the structural design of the integrated servo motor, the thermal resistance between the brake stator and the end cover is relatively large, which is not conducive to the heat dissipation of the brake stator. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a motor end cover to reduce the thermal resistance between the brake stator and the motor end cover, improve the heat conduction condition of the brake stator, and reduce the temperature rise of the brake stator.

[0005] The utility model also provides a servo motor and an industrial robot adopting the motor end cover.

[0006] According to the motor end cover of the first aspect of the utility model, which is used for a servo motor, the motor end cover includes an end cover body and a mounting sleeve, the end cover body has a bottom wall and a peripheral wall, the peripheral wall is arranged on the outer peripheral edge of the bottom wall, and the bottom wall is provided with a bearing seat; the mounting sleeve is connected to the bottom wall, the mounting sleeve is arranged along the circumference of the bearing seat and extends along the axial direction of the servo motor shaft, and the mounting sleeve is used to accommodate the brake stator of the servo motor so that the radial side of the brake stator is opposite to the inner wall of the mounting sleeve.

[0007] The motor end cover according to the embodiment of the utility model has at least the following beneficial effects: the motor end cover of the utility model is provided with a mounting sleeve, the mounting sleeve is used to accommodate the brake stator, the radial side surface of the brake stator is opposite to the inner wall of the mounting sleeve, the heat dissipation area between the brake stator and the motor end cover is increased, the air gap between the brake stator and the motor end cover is reduced, and the thermal resistance between the brake stator and the motor end cover is reduced. When the servo motor is running, the heat generated by the brake stator can be dissipated through the mounting sleeve and the bottom wall, which improves the heat dissipation speed and reduces the temperature rise of the brake stator.

[0008] According to some embodiments of the present invention, the mounting sleeve and the end cover body are integrally formed.

[0009] According to some embodiments of the utility model, a stop portion is provided at one end of the bearing seat away from the mounting sleeve, and the stop portion radially extends in a direction close to the rotating shaft.

[0010] According to some embodiments of the utility model, a front end face is provided on one side of the bearing seat, and the front end face is used to cooperate with the axial end face of the brake stator.

[0011] According to some embodiments of the utility model, an assembly space is provided on a side of the end cover body facing away from the mounting sleeve, and the assembly space is used to assemble a rotary transformer of the servo motor.

[0012] According to some embodiments of the utility model, a plurality of connecting members are provided between the bearing seat and the peripheral wall, the plurality of connecting members are arranged at intervals along the circumference of the bearing seat, and the connecting members are used to fix the rotary transformer.

[0013] The servo motor according to the second aspect of the present invention comprises: the motor end cover as described in any one of the above items, the bearing seat being equipped with a bearing; a rotating shaft, one end of which is passed through the bearing; a brake assembly, comprising a brake stator and a brake rotor, the brake rotor being arranged on the rotating shaft, the brake stator sleeve being arranged on the outside of the brake rotor, and the brake stator being arranged on the mounting sleeve.

[0014] According to some embodiments of the utility model, the bearing comprises an inner ring and an outer ring, the outer ring is fixedly connected to the bearing seat, the inner ring and the outer ring are rotatably connected, and the axial end face of the brake stator is arranged in close contact with the outer ring.

[0015] According to some embodiments of the present invention, the bearing seat has a front end surface on a side close to the brake stator, and the axial gap between the brake stator and the front end surface is less than or equal to 0.5 mm.

[0016] According to some embodiments of the present utility model, a first heat-conducting layer is provided between the brake stator and the front end surface.

[0017] According to some embodiments of the present invention, a radial gap between the mounting sleeve and the brake stator is less than or equal to 1 mm.

[0018] According to some embodiments of the present invention, a second heat-conducting layer is provided between the mounting sleeve and the brake stator.

[0019] The servo motor according to the embodiment of the utility model has at least the following beneficial effects: the servo motor of the utility model adopts the above-mentioned motor end cover, which increases the relative heat dissipation area between the brake stator and the motor end cover, reduces the air gap between the brake stator and the motor end cover, reduces the thermal resistance between the brake stator and the motor end cover, and improves the thermal conductivity condition of the brake stator. When the servo motor is running, the heat generated by the brake stator can be dissipated through the mounting sleeve and the bottom wall, thereby improving the heat dissipation speed and reducing the temperature rise of the brake stator.

[0020] An industrial robot according to an embodiment of the third aspect of the utility model comprises the servo motor described in any one of the above items.

[0021] The industrial robot provided in the embodiment of the present invention includes the servo motor of any of the above technical solutions and therefore has all the beneficial effects of the servo motor, which will not be described one by one here.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0024] Figure 1 This is a three-dimensional schematic diagram of a motor end cover according to an embodiment of the utility model;

[0025] Figure 2 A three-dimensional schematic diagram of another viewing direction of a motor end cover of an embodiment of the utility model;

[0026] Figure 3 A cross-sectional view of a servo motor according to an embodiment of the utility model;

[0027] Figure 4 This is a schematic diagram of the assembly of a brake assembly and a motor end cover of a servo motor according to an embodiment of the utility model;

[0028] Figure 5 for Figure 4 Enlarged view of point A in the middle

[0029] Figure Number:

[0030] Motor end cover 10;

[0031] End cover body 100, bottom wall 110, peripheral wall 120, bearing seat 130, front end surface 131, connecting plate 140, connecting hole 141, annular protrusion 142, groove 143, mounting sleeve 150, stopper 160, connecting member 170, assembly hole 171, default space 172, assembly space 180;

[0032] Servo motor 200, housing 210, casing 211, rotating shaft 220, radial gap 230, axial gap 240;

[0033] Bearing 300, inner ring 310, outer ring 320

[0034] Brake assembly 400, brake stator 410, brake rotor 420;

[0035] Rotary transformer 500. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] In the description of the present invention, it should be understood that the descriptions involving orientation, such as left, right, etc., the orientation or positional relationship indicated are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] In the description of the utility model, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0039] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0040] Reference Figure 1 The motor end cover 10 proposed in the first embodiment of the utility model is applied to the servo motor 200. The motor end cover 10 can be made of a metal material with good thermal conductivity to improve the heat dissipation efficiency of the motor end cover 10.

[0041] The motor end cover 10 includes an end cover body 100, which has a bottom wall 110 and a peripheral wall 120. The peripheral wall 120 is arranged at the outer peripheral edge of the bottom wall 110 and extends in the axial direction of the bottom wall 110 away from the bottom wall 110. A cylindrical structure can be formed between the bottom wall 110 and the peripheral wall 120. The cylindrical structure can be as follows: Figure 1 The square shape shown may also be a cylindrical shape, the bottom wall 110 may be arranged at the middle position of the peripheral wall 120, or may be arranged at one axial end of the peripheral wall 120, the bottom wall 110 is provided with a bearing seat 130, the bearing seat 130 is used to install the bearing 300 of the servo motor 200, and the bearing 300 is used to support the rotating shaft 220. In order to reduce the heat generated by the bearing 300 itself, a bearing 300 with less loss can be selected.

[0042] Reference Figure 1 A connecting plate 140 is provided at one end of the end cover body 100. The connecting plate 140 is arranged along the circumference of the peripheral wall 120 and extends in a direction away from the peripheral wall 120. A connecting hole 141 is provided on the connecting plate 140. The connecting hole 141 is used for fasteners (such as bolts and screws) to pass through. The motor end cover 10 can be fixedly connected to the motor housing 211 through the connecting plate 140.

[0043] Reference Figure 1 An annular protrusion 142 is provided on the connecting plate 140, and the annular protrusion 142 is arranged along the circumference of the connecting plate 140. A groove 143 is formed between the annular protrusion 142 and the connecting plate 140, and the groove 143 is used to accommodate a sealing ring. When the motor end cover 10 is assembled to the motor housing 211, the motor end cover 10 and the motor housing 211 are sealed by the sealing ring arranged in the groove 143 to prevent moisture from penetrating into the housing 211 of the servo motor 200.

[0044] A mounting sleeve 150 is provided on the bottom wall 110 of the motor end cover 10. The mounting sleeve 150 is arranged along the circumferential direction of the bearing seat 130 and extends along the axial direction of the rotating shaft 220 of the servo motor 200. The function of the mounting sleeve 150 is to accommodate the brake stator 410 of the servo motor 200. By arranging the brake assembly 400 in the motor end cover 10, the integration of the servo motor 200 is improved, thereby improving the power density of the servo motor 200. The mounting sleeve 150 can be made of the same material as the motor end cover 10, so that the mounting sleeve 150 has a heat dissipation performance corresponding to the motor end cover 10, thereby ensuring the heat dissipation efficiency between the brake stator 410 and the motor end cover 10.

[0045] The radial side surface of the brake stator 410 assembled in the mounting sleeve 150 is opposite to the inner wall of the mounting sleeve 150, thereby reducing the heat dissipation path between the radial side surface of the brake stator 410 and the motor end cover 10, and reducing the air gap between the brake stator 410 and the motor end cover 10, thereby reducing the thermal resistance between the brake stator 410 and the motor end cover 10, and at the same time, increasing the heat dissipation area between the brake stator 410 and the motor end cover 10. When the servo motor is running, the heat generated by the brake stator 410 can be dissipated through the mounting sleeve 150 and the bottom wall 110, thereby improving the heat dissipation speed and reducing the temperature rise of the brake stator 410.

[0046] It is understandable that the mounting sleeve 150 and the motor end cover 10 can be integrally formed or can be a split structure. The split structure facilitates the processing of the motor end cover 10 and the mounting sleeve 150. When the mounting sleeve 150 and the motor end cover 10 are a split structure, the mounting sleeve 150 can be fixed to the motor end cover 10 by welding, connecting with fixing parts, etc.

[0047] Reference Figure 1 The bearing seat 130 is provided with a stopper 160 at one end away from the mounting sleeve 150, and the stopper 160 radially extends in a direction close to the rotating shaft 220. The stopper 160 realizes axial positioning of the bearing 300 by cooperating with the retaining ring or the brake stator 410.

[0048] Reference Figure 1 In some embodiments, a front end face 131 is provided on one side of the bearing seat 130, and the front end face 131 is used to cooperate with the axial end face of the brake stator 410. When the brake stator 410 cooperates with the stopper 160 to axially position the bearing 300, the bearing 300 is partially exposed from the bearing seat 130, and the brake stator 410 abuts against the outer ring 320 of the bearing 300, so that the brake stator 410 and the outer ring 320 of the bearing 300 are axially tightly matched. When the bearing 300 adopts this positioning method, the axial length of the servo motor 200 can be reduced and the power density of the servo motor 200 can be improved. However, a gap will be left between the brake stator 410 and the front end face 131, which will increase the thermal resistance between the brake stator 410 and the motor end cover 10. Therefore, in the design process of the motor end cover 10, it is necessary to reduce the length of the axial gap 240 between the brake stator 410 and the front end face 131 to reduce the thermal resistance between the brake stator 410 and the fixed end cover, thereby reducing the temperature rise of the brake stator 410.

[0049] When the bearing 300 is axially positioned by using the retaining ring and the stopper 160, the bearing 300 is completely accommodated in the bearing seat 130. When the bearing 300 adopts this positioning method, the brake stator 410 does not need to abut against the outer ring 320 of the bearing 300. The axial end face of the brake stator 410 is tightly attached to the front end face 131. There is no air gap between the axial end face of the brake stator 410 and the motor end cover 10. Therefore, the thermal resistance between the brake stator 410 and the motor end cover 10 is small, which is beneficial to reducing the temperature rise of the brake stator 410, but will increase the axial length of the servo motor 200, thereby reducing the power density of the servo motor 200.

[0050] Reference Figure 2In some embodiments, the rotary transformer 500 of the servo motor 200 needs to be sleeved on the rotating shaft 220. In order to reduce the influence of the main heat source of the servo motor 200 on the rotary transformer 500, an assembly space 180 is provided on the end cover body 100 on the side away from the mounting sleeve 150. The assembly space 180 is formed by the bottom wall 110 and the peripheral wall 120. The rotary transformer 500 is arranged on the side of the bearing seat 130 away from the brake stator 410, and the rotary transformer 500 is located at the tail of the servo motor 200, which can reduce the heat transmitted to the rotary transformer 500 from the main heat source of the servo motor 200, such as the stator winding, the brake assembly 400 and other components, and avoid the rotary transformer 500 from working abnormally due to excessive temperature rise.

[0051] Reference Figure 2 In some embodiments, a plurality of connectors 170 are provided between the bearing seat 130 and the peripheral wall 120. The plurality of connectors 170 are arranged at intervals along the circumference of the bearing seat 130. The connectors 170 are provided with assembly holes 171. The assembly holes 171 are used for threaded connection of fasteners (such as bolts and screws). When the rotary transformer 500 is arranged in the assembly space 180, the rotary transformer 500 can be connected to the connectors 170 by fasteners. A plurality of connectors 170 are provided. The plurality of connectors 170 are arranged at intervals along the circumference of the bearing seat 130, so that a plurality of default spaces 172 are formed between the connectors 170 and the bottom wall 110. The thermal resistance formed by the default spaces 172 can reduce the heat conducted from the brake stator 410 to the rotary transformer 500 along the bottom wall 110, thereby preventing the rotary transformer 500 from working abnormally due to excessive temperature rise.

[0052] Reference Figure 3 The servo motor 200 proposed in the second embodiment of the utility model includes a housing 210, a rotating shaft 220 and a brake assembly 400. The housing 210 includes a casing 211 and a motor end cover 10. The motor end cover 10 is fixedly connected to the casing 211 by fasteners such as bolts, and the motor end cover 10 adopts the structure disclosed in any of the above embodiments. It can be understood that the casing 211 needs to have good heat dissipation performance so that the heat generated inside the motor can be dissipated in time. Therefore, the casing 211 can be made of materials with good thermal conductivity, such as metal materials and other non-metallic materials with good thermal conductivity.

[0053] Specifically, refer to Figure 1 , Figure 2In this embodiment, the motor end cover 10 used in the servo motor of the utility model includes an end cover body 100, and the end cover body 100 has a bottom wall 110 and a peripheral wall 120, the peripheral wall 120 is arranged on the outer peripheral edge of the bottom wall 110, and extends in the axial direction of the bottom wall 110 away from the bottom wall 110, and a cylindrical structure can be formed between the bottom wall 110 and the peripheral wall 120, and the cylindrical structure is as follows Figure 1 In the cylindrical shape shown, the bottom wall 110 is arranged in the middle position of the peripheral wall 120 , and a bearing seat 130 is provided on the bottom wall 110 . The bearing seat 130 is used to install the bearing 300 of the servo motor 200 , and the bearing 300 is used to support the rotating shaft 220 .

[0054] A connecting plate 140 is provided at one end of the end cover body 100. The connecting plate 140 is arranged along the circumference of the peripheral wall 120 and extends in a direction away from the peripheral wall 120. A connecting hole 141 is provided on the connecting plate 140. The connecting hole 141 is used for fasteners (such as bolts and screws) to pass through. The motor end cover 10 can be fixedly connected to the motor housing 211 through the connecting plate 140.

[0055] An annular protrusion 142 is provided on the connecting plate 140, and the annular protrusion 142 is arranged along the circumference of the connecting plate 140. A groove 143 is formed between the annular protrusion 142 and the connecting plate 140, and the groove 143 is used to accommodate a sealing ring. When the motor end cover 10 is assembled to the motor housing 211, the motor end cover 10 and the motor housing 211 are sealed by the sealing ring arranged in the groove 143 to prevent moisture from penetrating into the housing 211 of the servo motor 200.

[0056] A mounting sleeve 150 is provided on the bottom wall 110 of the motor end cover 10. The mounting sleeve 150 is arranged along the circumferential direction of the bearing seat 130 and extends along the axial direction of the rotating shaft 220 of the servo motor 200. The function of the mounting sleeve 150 is to accommodate the brake stator 410 of the servo motor 200. By arranging the brake assembly 400 in the motor end cover 10, the integration of the servo motor 200 is improved, thereby improving the power density of the servo motor 200. The mounting sleeve 150 can be made of the same material as the motor end cover 10. The mounting sleeve 150 and the motor end cover 10 are integrally processed and formed, so that the mounting sleeve 150 has a heat dissipation performance corresponding to the motor end cover 10, thereby ensuring the heat dissipation efficiency between the brake stator 410 and the motor end cover 10.

[0057] The end of the bearing seat 130 away from the mounting sleeve 150 is provided with a stopper 160, and the stopper 160 radially extends in a direction close to the rotating shaft 220. The stopper 160 achieves axial positioning of the bearing 300 by cooperating with the retaining ring or the brake stator 410.

[0058] A front end face 131 is provided on one side of the bearing seat 130, and the front end face 131 is used to cooperate with the axial end face of the brake stator 410. When the brake stator 410 cooperates with the stopper 160 to axially position the bearing 300, the bearing 300 is partially exposed from the bearing seat 130, and the brake stator 410 abuts against the outer ring 320 of the bearing 300, so that the brake stator 410 and the outer ring 320 of the bearing 300 are axially tightly matched.

[0059] An assembly space 180 is provided on one side of the end cover body 100 away from the mounting sleeve 150 . The assembly space 180 is used to assemble the rotary transformer 500 of the servo motor 200 . The assembly space 180 is formed by enclosing the bottom wall 110 and the peripheral wall 120 .

[0060] A plurality of connectors 170 are provided between the bearing seat 130 and the peripheral wall 120. The plurality of connectors 170 are arranged at intervals along the circumference of the bearing seat 130. The connectors 170 are provided with assembly holes 171. The assembly holes 171 are used for threaded connection of fasteners (such as bolts and screws). When the rotary transformer 500 is arranged in the assembly space 180, the rotary transformer 500 can be connected to the connectors 170 by fasteners. The plurality of connectors 170 are arranged at intervals along the circumference of the bearing seat 130, so that a plurality of default spaces 172 are formed between the connectors 170 and the bottom wall 110. The thermal resistance formed by the default spaces 172 can reduce the heat conducted from the brake stator 410 along the bottom wall 110 to the rotary transformer 500, thereby preventing the rotary transformer 500 from working abnormally due to excessive temperature rise.

[0061] It can be understood that the motor end cover 10 disclosed in the above embodiment has a bottom wall 110 and a peripheral wall 120, the peripheral wall 120 is arranged on the outer peripheral edge of the bottom wall 110, and extends in the axial direction of the bottom wall 110 in a direction away from the bottom wall 110, and a bearing seat 130 is provided on the bottom wall 110, and a bearing 300 is installed on the bearing seat 130, and one end of the rotating shaft 220 is passed through the bearing 300. The brake assembly 400 includes a brake stator 410 and a brake rotor 420, the brake rotor 420 is arranged on the rotating shaft 220, the brake stator 410 is sleeved on the outside of the brake rotor 420, and the brake stator 410 is arranged on the mounting sleeve 150.

[0062] Reference Figure 3 , Figure 4In order to reduce the heat generated by the bearing 300 itself, a bearing 300 with less loss can be selected. The bearing 300 has an inner ring 310 and an outer ring 320. The outer ring 320 is fixedly connected to the bearing seat 130. The inner ring 310 and the outer ring 320 are rotatably connected. Rotating parts (such as balls, rollers, etc.) are arranged between the inner ring 310 and the outer ring 320 to realize the function of supporting rotation. The rotating shaft 220 is passed through the inner ring 310 of the bearing 300. The brake assembly 400 is arranged in the motor end cover 10, and the brake stator 410 is arranged in the mounting sleeve 150, which improves the integration of the servo motor 200 and further improves the power density of the servo motor 200.

[0063] The brake assembly 400 is an electromagnetic brake, which can adopt a normally closed structure, that is, the electromagnetic brake is released when the power is on, and locked when the power is off, so as to improve the safety of the servo system. For the normally closed structure, the electromagnetic brake needs to be always in the energized state when the motor is working, and there is continuous heating. Therefore, under the condition of meeting the speed and braking torque requirements, try to choose an electromagnetic brake with a smaller heating power to reduce the local heating of the motor and reduce the temperature rise of the motor.

[0064] It is understandable that the brake assembly 400 may adopt other forms of structures commonly used in the servo motor 200, such as a normally open electromagnetic brake, which is not limited here.

[0065] The servo motor 200 of the utility model adopts the above-mentioned motor end cover 10, which increases the relative heat dissipation area between the brake stator 410 and the motor end cover 10, reduces the air gap between the brake stator 410 and the motor end cover 10, reduces the thermal resistance between the brake stator 410 and the motor end cover 10, and improves the thermal conductivity condition of the brake stator 410. When the servo motor is running, the heat generated by the brake stator 410 can be dissipated through the mounting sleeve 150 and the bottom wall 110, thereby improving the heat dissipation speed and reducing the temperature rise of the brake stator 410.

[0066] It is understandable that when the brake stator 410 is installed in the mounting sleeve 150, it can be connected to the mounting sleeve 150 by a transition fit or a clearance fit. When a transition fit is adopted, the air gap between the brake stator 410 and the mounting sleeve 150 can be eliminated or reduced, the thermal resistance between the brake stator 410 and the motor end cover 10 can be reduced, the heat dissipation efficiency between the brake stator 410 and the motor end cover 10 can be improved, and the temperature rise of the brake stator 410 can be reduced.

[0067] Reference Figure 4 , Figure 5In some embodiments, the bearing 300 is partially exposed outside the bearing seat 130, and the axial end face of the brake stator 410 is arranged close to the outer ring 320 of the bearing 300. The end of the outer ring 320 of the bearing 300 away from the brake stator 410 abuts against the stopper 160 of the bearing seat 130. Through the cooperation between the brake stator 410 and the stopper 160, the axial positioning of the bearing 300 on the rotating shaft 220 is achieved to reduce the axial length of the motor and further improve the integration of the servo motor 200.

[0068] Since the brake assembly 400 will continue to generate heat when the servo motor 200 is running, and while improving the integration of the servo motor 200, a gap will exist between the brake stator 410 and the motor end cover 10. Therefore, it is necessary to increase the heat dissipation area between the brake assembly 400 and the motor end cover 10, and reduce the thermal resistance between the brake assembly 400 and the motor end cover 10.

[0069] Reference Figure 4 , Figure 5 In some embodiments, a front end face 131 is provided on one side of the motor end cover 10 close to the brake stator 410, and the front end face 131 is opposite to the axial end of the brake stator 410. An axial gap 240 is provided between the brake stator 410 and the front end face 131, and the size of the axial gap 240 is controlled to be less than 0.5 mm to reduce the axial thermal resistance between the brake stator 410 and the motor end cover 10, and reduce the temperature difference between the brake stator 410 and the motor end cover 10.

[0070] It is understandable that, in some embodiments, a retaining ring can also be used to axially position the bearing 300. In this embodiment, the axial dimension of the bearing seat 130 can be larger than the axial dimension of the bearing 300, and the bearing 300 is fully assembled in the bearing seat 130. The axial end face of the brake stator 410 is in contact with the front end face 131 of the motor end cover 10. Therefore, when the retaining ring is used instead of the brake stator 410 to axially position the bearing 300, the air gap between the brake stator 410 and the motor end cover 10 is eliminated, the thermal resistance between the brake stator 410 and the motor end cover 10 is reduced, and the temperature of the brake assembly 400 is further reduced.

[0071] Reference Figure 5 There is a radial gap 230 between the brake stator 410 and the mounting sleeve 150. The radial gap 230 is controlled to be less than or equal to 1 mm, which can reduce the radial thermal resistance between the brake stator 410 and the motor end cover 10 and reduce the temperature difference between the brake stator 410 and the motor end cover 10.

[0072] Reference Figure 5It can be understood that when there is an axial gap 240 between the brake stator 410 and the front end face 131, a first heat conductive layer can be set between the brake stator 410 and the front end face 131 to reduce the thermal resistance between the brake stator 410 and the motor end cover 10 and reduce the temperature of the brake stator 410.

[0073] Reference Figure 5 It can be understood that a second heat-conducting layer is provided in the radial gap 230 between the brake stator 410 and the mounting sleeve 150 to reduce the thermal resistance between the brake stator 410 and the motor end cover 10 and reduce the temperature of the brake stator 410 .

[0074] It can be understood that the first thermal conductive layer and the second thermal conductive layer can adopt thermal conductive materials such as thermal conductive glue and indium sheet. When using thermal conductive glue, the thermal conductive glue can be coated on the front end face 131 and the inner side surface of the mounting sleeve 150, and the indium sheet can be pasted on the front end face 131 and the inner side surface of the mounting sleeve 150.

[0075] It is understandable that the thermal conductive adhesive can be made of high thermal conductive materials such as epoxy resin AB glue, silicone thermal conductive glue, polyurethane glue, polyurethane thermal conductive and electrically conductive glue, thermal conductive silicone grease, etc., which is not limited here.

[0076] Reference Figure 3 In some embodiments, the rotary transformer 500 of the servo motor 200 is sleeved on the rotating shaft 220. In order to reduce the influence of the main heat source of the servo motor 200 on the rotary transformer 500, an assembly space 180 is provided on the end cover body 100 on the side away from the mounting sleeve 150. The assembly space 180 is used to assemble the rotary transformer 500 of the servo motor 200. The rotary transformer 500 is arranged on the side of the bearing seat 130 away from the brake stator 410, and the rotary transformer 500 is installed at the tail of the servo motor 200, which can reduce the heat transmitted to the rotary transformer 500 from the main heat source of the servo motor 200, such as the stator winding, the brake assembly 400 and other components, and avoid the rotary transformer 500 from working abnormally due to excessive temperature rise.

[0077] The third aspect of the present invention provides an industrial robot, comprising any of the servo motors described above. The industrial robot provided by the embodiment of the present invention has all the beneficial effects of the servo motor because it comprises any of the servo motors described above, which will not be described one by one here.

[0078] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] Of course, the present invention is not limited to the above-mentioned embodiments, and technicians familiar with the field may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A motor end cover for a servo motor, characterized in that: include: The end cover body comprises a bottom wall and a peripheral wall, wherein the peripheral wall is arranged at the outer peripheral edge of the bottom wall, and the bottom wall is provided with a bearing seat; A mounting sleeve is connected to the bottom wall, the mounting sleeve is arranged along the circumference of the bearing seat and extends along the axial direction of the servo motor shaft, and the mounting sleeve is used to accommodate the brake stator of the servo motor so that the radial side surface of the brake stator is opposite to the inner wall of the mounting sleeve.

2. The motor end cover according to claim 1, characterized in that: The mounting sleeve is integrally formed with the end cover body.

3. The motor end cover according to claim 1, characterized in that: A stopper is provided at one end of the bearing seat away from the mounting sleeve, and the stopper extends radially in a direction close to the rotating shaft.

4. The motor end cover according to claim 1, characterized in that: A front end surface is provided on one side of the bearing seat, and the front end surface is used to cooperate with the axial end surface of the brake stator.

5. The motor end cover according to claim 1, characterized in that: An assembly space is provided on a side of the end cover body facing away from the mounting sleeve, and the assembly space is used to assemble the rotary transformer of the servo motor.

6. The motor end cover according to claim 5, characterized in that: A plurality of connecting members are provided between the bearing seat and the peripheral wall. The plurality of connecting members are arranged at intervals along the circumference of the bearing seat. The connecting members are used to fix the rotary transformer.

7. A servo motor, characterized in that: include: The motor end cover according to any one of claims 1 to 6, wherein the bearing seat is equipped with a bearing; A rotating shaft, one end of which is passed through the bearing; The brake assembly comprises a brake stator and a brake rotor, wherein the brake rotor is arranged on the rotating shaft, the brake stator sleeve is arranged on the outer side of the brake rotor, and the brake stator is arranged on the mounting sleeve.

8. The servo motor according to claim 7, characterized in that: The bearing comprises an inner ring and an outer ring, the outer ring is fixedly connected to the bearing seat, the inner ring is rotatably connected to the outer ring, and the axial end face of the brake stator is arranged closely against the outer ring.

9. The servo motor according to claim 8, characterized in that: The bearing seat has a front end surface on a side close to the brake stator, and an axial gap between the brake stator and the front end surface is less than or equal to 0.5 mm.

10. The servo motor according to claim 9, characterized in that: A first heat conducting layer is provided between the brake stator and the front end surface.

11. The servo motor according to claim 7, characterized in that: A radial clearance between the mounting sleeve and the brake stator is less than or equal to 1 mm.

12. The servo motor according to claim 11, characterized in that: A second heat-conducting layer is provided between the mounting sleeve and the brake stator.

13. An industrial robot, characterized in that: Comprising a servo motor as claimed in any one of claims 7 to 12.

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