An ultra-low-inertia servo motor

Abstract

The application relates to the technical field of servo motors, in particular to an ultra-low-inertia servo motor which comprises a machine body, a front end cover, a rear end cover, a stator, a multi-section rotor, a rotating shaft, a bearing assembly, an encoder module, an electromagnetic brake and a forced air cooling assembly; the machine body is integrally connected or separately connected with the front end cover; a large-size front bearing is fixedly locked by means of glue injection groove bonding, wave spring pre-tightening and front bearing pressing sheet locking, so that the running of the outer ring is completely eliminated; the rotor is provided with a multi-section iron core and profiled weight-reducing holes with avoidance anchor nodes, and the rotating inertia is greatly reduced by directly sleeving the rotating shaft; the whole machine is provided with multiple seals, forced air cooling and lifting ring screws, and has the advantages of high structural rigidity, good sealing protection, high heat dissipation efficiency and convenient disassembly and assembly. The application significantly improves the dynamic response and operation reliability of the motor, and is suitable for high-speed, high-precision and frequent forward and reverse rotation automatic precise transmission scenes.

Description

Technical Field

[0001] This invention relates to the field of servo motor technology, and in particular to an ultra-low inertia servo motor. Background Technology

[0002] As a core actuator in automated equipment, servo motors are facing increasing market demand for low inertia, high response, and high reliability. Existing servo motors generally suffer from large rotor inertia and slow acceleration / deceleration response, making them unsuitable for high-frequency dynamic conditions. Furthermore, the front bearings often use clearance fits, which can lead to outer race slippage under high speeds and frequent reversing conditions, resulting in accelerated bearing wear, decreased operating accuracy, and a shortened overall machine lifespan. In addition, poor motor sealing, low heat dissipation efficiency, insufficient structural rigidity, and inconvenient assembly and maintenance also make it difficult to meet the long-term stable operation requirements under harsh conditions.

[0003] Based on this, the present invention proposes an ultra-low inertia servo motor, which completely solves the above-mentioned technical problems through optimization of structure and connection relationship. Summary of the Invention

[0004] The purpose of this invention is to overcome the problems of the prior art and provide an ultra-low inertia servo motor to solve the technical problems of existing servo motors having large rotor inertia, easy front bearing movement, insufficient operational reliability, and difficulty in adapting to high-speed, frequent forward and reverse precision transmission conditions.

[0005] The above objectives are achieved through the following technical solutions: An ultra-low inertia servo motor includes a body, with a front cover and a rear cover respectively provided at the front and rear ends of the body. The body, the front cover, and the rear cover together form a shaft mounting cavity. A stator is fixedly disposed in the shaft mounting cavity. The stator is disposed against the inner wall of the body and forms a rotor movable cavity. A rotor is disposed in the rotor movable cavity and is fixedly sleeved on the shaft. A front bearing groove is provided at the axial center of the front cover, and the outer ring of the front bearing is fixedly installed in the front bearing groove. A front bearing pressure plate groove is provided on the outer side of the front cover, and a front bearing pressure plate is fixedly installed in the front bearing pressure plate groove. A wave spring is provided between the front bearing pressure plate and the front bearing, and the front bearing pressure plate is fixedly connected to the front cover. The rear end cover has a rear bearing groove at its axial center, and the outer ring of the rear bearing is fixedly installed in the rear bearing groove. The outer side of the rear end cover has a rear bearing pressure plate groove, and the rear bearing pressure plate is fixedly installed in the rear bearing pressure plate groove. The rotating shaft is fixedly sleeved with the inner ring of the front bearing and the inner ring of the rear bearing, respectively. The rear end of the rotating shaft extends out of the rear end cover and is connected to an encoder module. An encoder cover is sealed to the outside of the encoder module. The rotor has a multi-segment structure, comprising several rotor cores. Adjacent rotor cores are fixedly connected by anchor nodes. A through-hole contoured weight-reducing hole is provided inside the rotor core, and the contoured weight-reducing hole is positioned to avoid the anchor nodes.

[0006] Furthermore, the front bearing plate has a through hole coaxial with the front bearing groove, the inner diameter of the through hole being smaller than the outer diameter of the front bearing; an oil seal mounting groove is provided on the outer side of the front bearing plate corresponding to the through hole, and an oil seal is fixedly installed in the oil seal mounting groove.

[0007] Furthermore, an O-ring groove is provided on the outer wall of the front bearing plate groove, and an O-ring is embedded in the O-ring groove. The O-ring is sealed and clamped between the front bearing plate and the front end cover.

[0008] Furthermore, the inner wall of the front bearing recess is provided with glue injection grooves at equal intervals. The glue injection grooves are semi-closed open grooves and extend toward the front bearing plate recess. The outer ring of the front bearing is fixedly bonded to the front bearing recess by structural adhesive injected into the glue injection grooves.

[0009] Furthermore, the front bearing plate is provided with first front bearing plate screw holes at equal intervals in the circumferential direction, and the bottom wall of the front bearing plate groove is provided with second front bearing plate screw holes at equal intervals in the circumferential direction. The front bearing plate screw passes through the first front bearing plate screw hole and is screwed and fixed to the second front bearing plate screw hole.

[0010] Furthermore, the outer wall of the rotating shaft is provided with, from front to back, a rotating shaft extension, a rotating shaft oil seal, a front bearing sleeve, a rotor sleeve, an electromagnetic brake connection, a rear bearing sleeve, and an encoder connection. The rotating shaft oil seal is sealed to the oil seal, the front bearing sleeve is fixedly sleeved to the inner ring of the front bearing, the rotor sleeve is fixedly sleeved to the rotor, the electromagnetic brake connection is fixedly fitted with an electromagnetic brake, the rear bearing sleeve is fixedly sleeved to the inner ring of the rear bearing and is axially limited by a snap ring, and the encoder connection is fixedly connected to the encoder module.

[0011] Furthermore, the body and the front cover are integrally formed or separately fixedly connected; a stator socket is provided on the top of the body, and the stator socket and the stator are connected by PCB board wiring or manual wiring; a brake pressure cover is provided on the top of the rear cover, and an encoder socket is provided on the top of the encoder cover.

[0012] Furthermore, it also includes an air-cooling assembly, which includes a fan housing fitted onto the outside of the rear end cover. A fan cover plate is fixedly provided at the tail end of the fan housing. The fan cover plate has heat dissipation holes, and a fan is fixedly provided inside the heat dissipation holes. A fan clearance groove is provided on the top of the fan housing, which respectively avoids the stator socket, the brake pressure cover and the encoder socket.

[0013] Furthermore, a fan socket is provided on the top of the fan housing, the fan socket being electrically connected to the fan and supplying power to the fan.

[0014] Furthermore, two eye bolts are diagonally arranged on the top of the machine body, the inner wall of the contoured weight reduction hole is used to attach balancing mud during dynamic balancing, and the front bearing is a large-size bearing.

[0015] The ultra-low inertia servo motor provided by this invention significantly reduces the rotor's rotational inertia and improves the motor's dynamic response through a multi-segment rotor core, anchor node connection, and contoured weight-reducing hole design. The front bearing is stably assembled by using a front bearing groove, pressure plate fixation, and wave spring setting to prevent outer ring slippage. Reliable operation is achieved through a sealed connection of the rear end cover, rear bearing pressure plate, and encoder cover, making it suitable for high-speed, frequent forward and reverse precision transmission requirements. Attached Figure Description

[0016] Figure 1 This is a perspective view of an ultra-low inertia servo motor according to the present invention. Figure 2 This is a cross-sectional view of an ultra-low inertia servo motor according to the present invention. Figure 3 This is an assembly diagram of the air-cooled component, encoder cover, and rear end cover of an ultra-low inertia servo motor according to the present invention. Figure 4 This is a schematic diagram of the structure of the rotating shaft in an ultra-low inertia servo motor according to the present invention; Figure 5 This is a schematic diagram of the rotor structure in an ultra-low inertia servo motor according to the present invention; Figure 6 This is a schematic diagram of the air-cooled component in an ultra-low inertia servo motor according to the present invention. Figure 7 This is a schematic diagram of the assembly of the front cover and the front bearing pressure plate in an ultra-low inertia servo motor according to the present invention; Figure 8 This is a schematic diagram of the front end cover in an ultra-low inertia servo motor according to the present invention; Figure 9 This is an assembly diagram of the rear end cover, encoder module, and encoder cover in an ultra-low inertia servo motor according to the present invention. Figure 10 This is a schematic diagram of the assembly of the central shaft and the rear end cover of an ultra-low inertia servo motor according to the present invention.

[0017] Illustration markings: 1-Fuselage; 2-Front end cap, 201-Front bearing groove, 202-Front bearing, 203-Front bearing plate, 204-Front bearing plate groove, 205-Front bearing plate shaft through hole, 206-Oil seal mounting groove, 207-Oil seal, 208-O-ring, 209-O-ring groove, 210-First front bearing plate screw hole, 211-Second front bearing plate screw hole, 212-Front bearing plate screw, 213-Glue injection groove; 3-Rear end cap, 301-Rear bearing groove, 302-Rear bearing, 303-Rear bearing pressure plate, 304-Rear bearing pressure plate groove; 4-Shaft mounting cavity; 5-Stator; 6-Rotor, 601-Rotor core, 602-Anchor node, 603-Following weight reduction hole; 7-Shaft, 701-Shaft extension, 702-Shaft oil seal, 703-Front bearing sleeve, 704-Rotor sleeve, 705-Electromagnetic brake connection, 706-Rear bearing sleeve, 707-Encoder connection, 708-Snap ring; 8-Air-cooled components, 801-Air shroud housing, 802-Air shroud cover plate, 803-Heat dissipation holes, 804-Fan, 805-Air shroud clearance groove, 806-Fan socket; 9-Eye bolt; 10-Electromagnetic brake; 11-Encoder module; 12-Encoder cover; 13-Stator socket; 14-Brake clamping cable cover; 15 - Encoder socket. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. The described embodiments are merely some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] like Figures 1-3As shown, this solution provides an ultra-low inertia servo motor, including a body 1, a front cover 2, a rear cover 3, a stator 5, a rotor 6, a shaft 7, a front bearing 202, a rear bearing 302, an encoder module 11, an encoder cover 12, an electromagnetic brake 10, an air-cooling assembly 8, and eye bolts 9. The components are rigidly fixed, sealed, and limited to form an integral structure.

[0020] like Figures 1-3 As shown, in this embodiment, the body 1 serves as the main support structure for the motor. The front end of the body 1 and the front end cover 2 adopt an integral molding structure or a separate fixed connection structure. The integral molding structure can improve the rigidity of the whole machine structure, reduce assembly screws, and reduce production costs; the separate fixed connection structure facilitates the processing of parts and the assembly of internal components, and is suitable for small-batch multi-specification production needs.

[0021] The rear end of the body 1 is fixedly connected to the rear end cover 3. The body 1, the front end cover 2, and the rear end cover 3 together enclose and form a rotating shaft mounting cavity 4, providing a closed mounting space for internal moving parts, preventing external dust and moisture from entering, and improving the overall protection of the machine.

[0022] like Figure 2 As shown, in this embodiment, a stator 5 is fixedly installed inside the rotating shaft mounting cavity 4. The stator 5 is tightly fitted to the inner wall of the body 1 to ensure the stability of the stator assembly and improve the electromagnetic conversion efficiency.

[0023] The inner side of the stator 5 forms a coaxial rotor cavity, and the rotor 6 is coaxially arranged inside the rotor cavity. The rotor 6 is fixedly sleeved on the rotating shaft 7. The keyway connection structure is eliminated, the added mass of the rotor is reduced, and the moment of inertia is further reduced.

[0024] like Figure 5 As shown, the rotor 6 in this embodiment is a multi-segment lightweight structure, composed of several rotor cores 601. Adjacent rotor cores 601 are fixedly connected by anchor nodes 602 to avoid the twisting defects of slender cores during pressing and to ensure the structural strength of the rotor.

[0025] The rotor core 601 adopts a slender structure with a reduced outer diameter and increased stacking height. It has a through-hole 603 for weight reduction. The through-hole 603 avoids the anchor node 602. While ensuring the mechanical strength of the rotor, it maximizes the removal of excess mass and significantly reduces the rotor's moment of inertia. The inner wall of the through-hole 603 is used to attach balancing mud during dynamic balancing. This increases the contact area of ​​the balancing mud, improves the stability of dynamic balancing, and ensures the smooth operation of the motor.

[0026] like Figure 2 , Figure 7 and Figure 8As shown, in this embodiment, a front bearing groove 201 is provided at the axial position of the front cover 2. The outer ring of the front bearing 202 is fixedly installed in the front bearing groove 201. The front bearing 202 adopts a large-size bearing to improve the bearing load capacity and impact and vibration resistance, and is suitable for high-speed working conditions.

[0027] The inner wall of the front bearing groove 201 is provided with glue injection grooves 213 at equal intervals. The glue injection grooves 213 are semi-closed open grooves and extend towards the front bearing pressure plate groove 204. The outer ring of the front bearing 202 is fixedly bonded to the front bearing groove 201 by injecting structural adhesive into the glue injection grooves 213, so as to completely fix the bearing outer ring to the front end cover and eliminate the problem of bearing outer ring running and radial movement from the root.

[0028] The outer side of the front cover 2 is provided with a front bearing plate groove 204, and a front bearing plate 203 is fixedly installed in the front bearing plate groove 204. The front bearing plate 203 is provided with first front bearing plate screw holes 210 at equal intervals in the circumferential direction, and the bottom wall of the front bearing plate groove 204 is provided with a second front bearing plate screw hole 211. The front bearing plate screw 212 passes through the first front bearing plate screw hole 210 and screws and fixes with the second front bearing plate screw hole 211, so as to realize the rigid locking of the front bearing plate and the front cover and improve the overall rigidity of the front cover assembly.

[0029] A wave spring is provided between the front bearing pressure plate 203 and the front bearing 202. The inner diameter of the through hole 205 of the front pressure plate shaft is smaller than the outer diameter of the front bearing 202. The wave spring applies a uniform preload to the outer ring of the bearing to eliminate the axial clearance of the bearing. In conjunction with the axial limiting of the front bearing pressure plate, it further prevents the bearing from running out of the outer ring and from axial movement.

[0030] The front bearing plate 203 has a front plate shaft through hole 205 coaxial with the front bearing groove 201. The outer side of the front bearing plate 203 corresponding to the front plate shaft through hole 205 has an oil seal mounting groove 206. An oil seal 207 is fixedly installed in the oil seal mounting groove 206. The oil seal 207 is sealed with the shaft oil seal part 702 of the shaft 7 to achieve dynamic sealing of the shaft extension part and prevent dust and moisture from entering the motor.

[0031] The outer wall of the front bearing plate groove 204 is provided with an O-ring groove 209, and an O-ring 208 is embedded in the O-ring groove 209. The O-ring 208 is sealed and clamped between the front bearing plate 203 and the front end cover 2, so as to achieve an axial static seal between the front end cover and the front bearing plate, forming a double sealing structure and greatly improving the protection level of the whole machine.

[0032] like Figure 9 and Figure 10As shown, in this embodiment, a rear bearing groove 301 is provided at the axial center of the rear end cover 3. The outer ring of the rear bearing 302 is fixedly installed in the rear bearing groove 301. A rear bearing pressure plate groove 304 is provided on the outer side of the rear end cover 3. A rear bearing pressure plate 303 is fixedly installed in the rear bearing pressure plate groove 304. The rear bearing pressure plate axially limits the outer ring of the rear bearing to ensure stable assembly of the rear bearing and prevent axial movement.

[0033] like Figure 4 As shown, the rotating shaft 7 in this embodiment is an integral high-precision shaft made of aviation aluminum alloy material, such as grade 7071. The outer wall is provided with the following parts in sequence from front to back: rotating shaft extension 701, rotating shaft oil seal 702, front bearing sleeve 703, rotor sleeve 704, electromagnetic brake connection 705, rear bearing sleeve 706 and encoder connection 707. Each shaft segment is precisely positioned to correspond to the components, ensuring the coaxiality of the rotating shaft and reducing vibration and noise.

[0034] like Figure 2 As shown, the shaft extension 701 extends out of the front end cover 2 to output torque; the shaft oil seal 702 is sealed with the oil seal 207; the front bearing sleeve 703 is fixedly sleeved with the inner ring of the front bearing 202; the rotor sleeve 704 is fixedly sleeved with the rotor 6; the electromagnetic brake connection 705 is fixedly fitted with the electromagnetic brake 10 to realize rapid braking of the motor and improve braking accuracy; the rear bearing sleeve 706 is fixedly sleeved with the inner ring of the rear bearing 302 and is axially limited by the snap ring 708 to prevent axial movement of the inner ring of the rear bearing and ensure the stability of the shaft operation; the encoder connection 707 is fixedly connected with the encoder module 11 to realize high-precision detection of speed and position.

[0035] like Figure 3 and Figure 9 As shown, the encoder module 11 is sealed to the outside of the encoder cover 12, which forms a closed protection for the encoder module, avoids external impact and dust interference, and improves the reliability of encoder operation.

[0036] like Figures 1-3 As shown, in this embodiment, a stator socket 13 is provided on the top of the body 1. The stator socket 13 and the stator 5 are connected by PCB board wiring or manual wiring. PCB board wiring is neat and compact, saves internal space, and is convenient for maintenance; manual wiring is suitable for high current transmission and meets the needs of different power ranges.

[0037] The top of the rear cover 3 is provided with a brake wire clamping cover 14 to facilitate the wiring and organization of the electromagnetic brake power supply; the top of the encoder cover 12 is provided with an encoder socket 15 to facilitate quick wiring of the encoder module.

[0038] like Figure 2 , Figure 3 and Figure 6 As shown, in this embodiment, the air-cooled component 8 includes a fan housing 801 sleeved on the outside of the rear end cover 3. A fan cover plate 802 is fixedly installed at the tail end of the fan housing 801. The fan cover plate 802 has heat dissipation holes 803. A fan 804 is fixedly installed inside the heat dissipation holes 803 to achieve forced air cooling of the motor, avoid overheating and derating of the motor under high power conditions, and improve the stability of continuous operation.

[0039] The top of the fan housing 801 is provided with a fan housing clearance groove 805, which avoids the stator socket 13, the brake wire cover 14 and the encoder socket 15 respectively, so as to avoid assembly interference and ensure convenient installation of the air-cooled components.

[0040] The top of the fan housing 801 is provided with a fan socket 806, which is electrically connected to the fan 804 to realize independent external power supply for the fan and facilitate wiring.

[0041] In this embodiment, two eye bolts 9 are also provided diagonally at the top of the body 1 to facilitate the overall hoisting, transportation and installation of the motor, and greatly improve the convenience of disassembly and maintenance.

[0042] Example 1: Split-type ultra-low inertia servo motor In this embodiment, the servo motor's body 1 and front cover 2 are manufactured separately and connected by bolts. The rotor 6 consists of four rotor cores 601, with adjacent cores fixed by anchor nodes 602. Conformal weight-reducing holes 603 are provided through and avoid the anchor nodes, and balancing mud is applied to the inner wall to complete dynamic balance correction. The front bearing 202 is of a large size. After being pressed into the front bearing groove 201, structural adhesive is injected into the glue injection groove 213 to firmly bond the bearing outer ring to the front cover. A wave spring is assembled between the front bearing and the front bearing plate. Six front bearing plate screws 212 are evenly tightened circumferentially to ensure a rigid connection. The oil seal 207 is installed in the oil seal mounting groove 206 and the shaft oil seal. The 702 part is sealed and fitted, and the O-ring 208 is embedded in the O-ring groove 209 to achieve axial sealing; the shaft sections of the rotating shaft 7 are sequentially equipped with the front bearing 202, rotor 6, electromagnetic brake 10, and rear bearing 302. The rear bearing is axially limited by the snap ring 708. The encoder connection part 707 connects to the encoder module 11 and seals the encoder cover 12; the stator socket 13 on the top of the body 1 uses PCB board wiring, and the wiring is neat; the fan shroud 801 of the air-cooled component 8 is sleeved on the outside of the rear cover 3, and the fan shroud clearance groove 805 avoids the sockets. The fan 804 is independently powered through the fan socket 806; two lifting eye screws 9 are installed diagonally on the top of the body 1 for easy lifting and handling.

[0043] This embodiment achieves the technical effects of low rotor inertia, no bearing outer ring slippage, multiple seals, and forced heat dissipation through the above connection structure, resulting in excellent dynamic response and operational reliability.

[0044] Example 2: Integrated Ultra-Low Inertia Servo Motor The servo motor body 1 and front cover 2 provided in this embodiment are integrally die-cast from aluminum alloy, which improves the rigidity of the overall structure and reduces assembly processes; the rotor 6 adopts a five-segment rotor core 601, and the slender structure further reduces inertia; the stator socket 13 adopts manual wiring to adapt to the needs of high power and high current transmission; the front bearing 202 adopts an enlarged bearing, with double protection of glue bonding and wave spring pre-tightening, completely eliminating the outer ring slippage; the rear bearing pressure plate 303 rigidly locks the rear bearing 302 to ensure stable shaft operation; the remaining sealing, limiting, heat dissipation, braking, and hoisting connection structures are consistent with those in Embodiment 1.

[0045] This embodiment further enhances the structural strength and high-speed operation stability of the motor through a rigid, one-piece molded connection, making it suitable for mass production and harsh working conditions.

[0046] The above description is merely illustrative of the embodiments of the present invention and is not intended to limit the present invention. For those skilled in the art, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A servo motor with ultra-low inertia, characterized in that, The device includes a body (1), with a front cover (2) and a rear cover (3) respectively provided at the front and rear ends of the body (1). The body (1), the front cover (2) and the rear cover (3) together form a rotating shaft mounting cavity (4). A stator (5) is fixedly provided in the rotating shaft mounting cavity (4). The stator (5) is attached to the inner wall of the body (1) and forms a rotor movable cavity. A rotor (6) is provided in the rotor movable cavity. The rotor (6) is fixedly sleeved on the rotating shaft (7). The front cover (2) has a front bearing groove (201) at its axial center, and the outer ring of the front bearing (202) is fixedly installed in the front bearing groove (201). The front bearing plate groove (204) is provided on the outer side of the front cover (2), and the front bearing plate (203) is fixedly installed in the front bearing plate groove (204). A wave spring is provided between the front bearing plate (203) and the front bearing (202), and the front bearing plate (203) is fixedly connected to the front cover (2). The rear end cover (3) has a rear bearing groove (301) at the axial center position, and the outer ring of the rear bearing (302) is fixedly installed in the rear bearing groove (301). The rear bearing pressure plate groove (304) is provided on the outer side of the rear end cover (3), and the rear bearing pressure plate (303) is fixedly installed in the rear bearing pressure plate groove (304). The rotating shaft (7) is fixedly sleeved with the inner ring of the front bearing (202) and the inner ring of the rear bearing (302), respectively. The rear end of the rotating shaft (7) extends out of the rear end cover (3) and is connected to the encoder module (11). The encoder module (11) is sealed with an encoder cover (12) on the outside. The rotor (6) has a multi-segment structure. The rotor (6) includes several rotor cores (601). Adjacent rotor cores (601) are fixedly connected by anchor nodes (602). A through-hole (603) is provided inside the rotor core (601). The through-hole (603) avoids the anchor nodes (602).

2. The ultra-low inertia servo motor according to claim 1, characterized in that, The front bearing plate (203) has a front plate shaft through hole (205) coaxial with the front bearing groove (201). The inner diameter of the front plate shaft through hole (205) is smaller than the outer diameter of the front bearing (202). The outer side of the front bearing plate (203) corresponding to the front plate shaft through hole (205) has an oil seal mounting groove (206). An oil seal (207) is fixedly installed in the oil seal mounting groove (206).

3. The ultra-low inertia servo motor according to claim 2, characterized in that, The outer wall of the front bearing plate groove (204) is provided with an O-ring groove (209), and an O-ring (208) is embedded in the O-ring groove (209). The O-ring (208) is sealed and clamped between the front bearing plate (203) and the front end cover (2).

4. The ultra-low inertia servo motor according to claim 1, characterized in that, The inner wall of the front bearing recess (201) is provided with glue injection grooves (213) at equal intervals. The glue injection grooves (213) are semi-closed open grooves. The glue injection grooves (213) extend toward the front bearing plate recess (204). The outer ring of the front bearing (202) is fixedly bonded to the front bearing recess (201) by structural adhesive injected into the glue injection grooves (213).

5. The ultra-low inertia servo motor according to claim 1, characterized in that, The front bearing plate (203) is provided with first front bearing plate screw holes (210) at equal intervals in the circumferential direction, and the bottom wall of the front bearing plate groove (204) is provided with second front bearing plate screw holes (211) at equal intervals in the circumferential direction. The front bearing plate screw (212) passes through the first front bearing plate screw hole (210) and is screwed and fixed to the second front bearing plate screw hole (211).

6. The ultra-low inertia servo motor according to claim 1, characterized in that, The outer wall of the rotating shaft (7) is provided with the following components from front to back: a rotating shaft extension (701), a rotating shaft oil seal (702), a front bearing sleeve (703), a rotor sleeve (704), an electromagnetic brake connection (705), a rear bearing sleeve (706), and an encoder connection (707). The rotating shaft oil seal (702) is sealed to the oil seal (207), the front bearing sleeve (703) is fixedly sleeved to the inner ring of the front bearing (202), the rotor sleeve (704) is fixedly sleeved to the rotor (6), the electromagnetic brake connection (705) is fixedly equipped with an electromagnetic brake (10), the rear bearing sleeve (706) is fixedly sleeved to the inner ring of the rear bearing (302) and is axially limited by a snap ring (708), and the encoder connection (707) is fixedly connected to the encoder module (11).

7. The ultra-low inertia servo motor according to claim 1, characterized in that, The body (1) and the front cover (2) are integrally formed or separately fixedly connected; the top of the body (1) is provided with a stator socket (13), and the stator socket (13) and the stator (5) are connected by PCB board wiring or manual wiring; the top of the rear cover (3) is provided with a brake pressure cover (14), and the top of the encoder cover (12) is provided with an encoder socket (15).

8. The ultra-low inertia servo motor according to claim 7, characterized in that, It also includes an air-cooling assembly (8), which includes a fan housing (801) sleeved on the outside of the rear end cover (3). A fan cover plate (802) is fixedly provided at the tail end of the fan housing (801). The fan cover plate (802) has heat dissipation holes (803). A fan (804) is fixedly provided inside the heat dissipation holes (803). A fan clearance groove (805) is provided on the top of the fan housing (801). The fan clearance groove (805) avoids the stator socket (13), the brake pressure cover (14), and the encoder socket (15) respectively.

9. A servo motor with ultra-low inertia according to claim 8, characterized in that, The top of the fan housing (801) is provided with a fan socket (806), which is electrically connected to the fan (804) and supplies power to the fan (804).

10. The ultra-low inertia servo motor according to claim 1, characterized in that, Two eye bolts (9) are provided diagonally at the top of the body (1). The inner wall of the contour weight reduction hole (603) is used to attach balancing mud during dynamic balancing. The front bearing (202) is a large-size bearing.

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