A servo motor capable of improving control accuracy

Abstract

The utility model discloses a kind of servo motor capable of improving control precision, including motor shell, encoder circuit board and circuit board fixed block, control chip is equipped on encoder circuit board, motor shell is equipped with shaft, the one end of shaft is equipped with magnetic member, magnetic member is concentrically arranged with shaft;The tail end of motor shell is distributed with multiple mounting posts, fixed screw is respectively equipped on mounting post, circuit board fixed block is sleeved in the periphery of mounting post, hollow positioning column is equipped on circuit board fixed block, positioning hole is equipped on encoder circuit board, positioning column is passed through corresponding positioning hole and is interference fit with positioning hole, fixed screw is connected with mounting post after being passed through positioning column, and fixed screw is respectively limited with encoder circuit board abutment. The utility model can reduce the installation fit clearance of encoder circuit board, improve the concentricity between control chip and magnetic member, so that the control precision of servo motor is higher, satisfy the processing use demand of high-precision.

Description

Technical Field

[0001] This utility model relates to the field of servo motor technology, specifically to a servo motor that can improve control precision. Background Technology

[0002] A servo motor is a precision motor that provides real-time feedback through a built-in encoder and uses a driver for closed-loop control. It continuously adjusts its output based on the error between the command signal and the actual state, thereby achieving high-precision, high-response, high-torque, and high-reliability position, speed, or torque control. It is an indispensable core power component in modern automation and precision machinery.

[0003] In servo motors, the encoder circuit board is typically mounted at the rear of the motor and fixed to the motor housing with screws. During operation, the control chip on the encoder circuit board interacts with magnetic components on the motor shaft to control the shaft's rotation angle. Therefore, the concentricity of the control chip on the encoder circuit board and the magnetic components on the shaft is crucial for achieving precise control of the shaft's rotation angle. Currently, most servo motors directly fix the encoder circuit board to the rear of the motor housing with screws. However, during installation, a tolerance of approximately 0.2-0.5mm is usually allowed between the screws and the mounting holes of the encoder circuit board. This results in a certain degree of eccentricity for the encoder circuit board when mounted on the motor housing, typically reaching 0.1-0.2mm, which inevitably affects the control accuracy of the servo motor. Therefore, the existing servo motor structure needs improvement. Utility Model Content

[0004] To address some or all of the problems existing in the prior art, this utility model provides a servo motor capable of improving control accuracy, comprising a motor housing, an encoder circuit board, and a circuit board fixing block. The circuit board fixing block is connected to the motor housing, and the encoder circuit board is connected to the motor housing via the circuit board fixing block. A control chip is located at the center of the encoder circuit board. A rotatable shaft is located inside the motor housing, and a magnetic element is located at one end of the shaft, with the magnetic element concentrically arranged with the shaft. Multiple mounting posts are circumferentially distributed at the tail end of the motor housing, and fixing screws are provided on each mounting post. The circuit board fixing block is sleeved around the mounting posts. Hollow positioning posts are provided on the circuit board fixing block at corresponding positions to the mounting posts. Positioning holes are provided on the encoder circuit board at corresponding positions to the positioning posts. The positioning posts pass through the corresponding positioning holes and are interference-fitted with the positioning holes. The fixing screws pass through the positioning posts and are connected to the mounting posts, and the fixing screws respectively abut against the encoder circuit board for limiting.

[0005] As a further improvement of this utility model, the circuit board fixing block is a hollow columnar structure, and the inner side wall of the circuit board fixing block is provided with a mounting step surface. The encoder circuit board abuts against the mounting step surface, and the outer side wall of the encoder circuit board is connected to the side wall of the mounting step surface.

[0006] As a further improvement of this utility model, the inner sidewall of the circuit board fixing block is provided with a first snap-fit ​​groove at a position corresponding to the mounting post, the mounting post is inserted into the corresponding first snap-fit ​​groove, and the mounting post and the first snap-fit ​​groove are interference fit.

[0007] As a further improvement of this utility model, the number of mounting columns is three.

[0008] As a further improvement of this utility model, the tail end of the motor housing is provided with a plurality of second snap-fit ​​slots, and the circuit board fixing block is provided with snap-fit ​​blocks at positions corresponding to the second snap-fit ​​slots, and the snap-fit ​​blocks snap-fit ​​into the corresponding second snap-fit ​​slots respectively.

[0009] As a further improvement of this utility model, the encoder circuit board is provided with a signal line, one end of which extends out of the motor housing. The motor housing is provided with a first sealing element, which is sealed and connected to the motor housing, the circuit board fixing block and the signal line respectively.

[0010] As a further improvement of this utility model, a motor stator is provided inside the motor housing, and a motor rotor is sleeved on the rotating shaft. The motor stator is sleeved around the motor rotor, and the two are fitted with a clearance.

[0011] As a further improvement of this utility model, the motor stator is provided with a power line, which passes through the motor housing and is electrically connected to the encoder circuit board. The circuit board fixing block is provided with a second sealing element, which is sealed and connected to the circuit board fixing block, the power line and the encoder circuit board respectively.

[0012] As a further improvement of this utility model, a speed reducer is provided at the end of the motor housing away from the circuit board fixing block, and the speed reducer is connected to the rotating shaft.

[0013] As a further improvement of this utility model, it also includes a brake, which is connected to the rotating shaft and electrically connected to the encoder circuit board.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention reduces the clearance between the encoder circuit board and the circuit board fixing block by adding a circuit board fixing block and using an interference fit between the positioning pin on the fixing block and the positioning hole on the encoder circuit board. This improves the concentricity between the encoder circuit board and the motor housing, thereby enhancing the concentricity between the control chip and the magnetic components. This results in higher control precision for the servo motor, meeting the requirements of high-precision machining. Actual measurements show that the eccentricity between the control chip and the magnetic components in this invention generally does not exceed 0.05mm, enabling precise control of the servo motor's shaft rotation angle. Attached Figure Description

[0016] To more clearly illustrate the solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of an embodiment of this utility model;

[0019] Figure 3 This is an exploded structural diagram of an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the structure of the motor housing in an embodiment of this utility model;

[0021] Figure 5 This is a schematic diagram of the circuit board fixing block in an embodiment of this utility model. Detailed Implementation

[0022] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used in the specification is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, not to describe a particular order.

[0023] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment to other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention can be combined with other embodiments.

[0024] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0025] like Figure 1 As shown, a servo motor capable of improving control precision includes a motor housing 1, an encoder circuit board 2, and a circuit board fixing block 3. The circuit board fixing block 3 is fixedly connected to the motor housing 1. The encoder circuit board 2 is fixedly connected to the motor housing 1 through the circuit board fixing block 3. A control chip 4 is provided at the center of the encoder circuit board 2. A rotatable shaft 5 is provided inside the motor housing 1. A magnetic element 6 is provided at one end of the shaft 5. The magnetic element 6 is concentrically arranged with the shaft 5 and is a permanent magnet. The control chip 4 is positioned corresponding to the magnetic element 6. The control chip 4 monitors the angular position of the magnetic element 6 to control the rotation angle of the shaft 5.

[0026] The motor housing 1 has multiple mounting posts 7 arranged in a circular pattern at its tail end. Each mounting post 7 is equipped with a fixing screw 8, which connects and fixes the encoder circuit board 2 and the circuit board fixing block 3 to the motor housing 1. Specifically, the circuit board fixing block 3 is fitted around the mounting posts 7. Hollow positioning posts 31 are located on the circuit board fixing block 3 at corresponding positions to the mounting posts 7. Positioning holes 21 are located on the encoder circuit board 2 at corresponding positions to the positioning posts 31. During assembly, the encoder circuit board 2 is placed on the circuit board fixing block 3, so that the positioning posts 31 pass through the corresponding positioning holes 21, and the positioning posts 31 and positioning holes 21 are press-fitted. Then, the fixing screws 8 are passed through the positioning posts 31 and connected and fixed to the mounting posts 7. The fixing screws 8 abut against the encoder circuit board 2, thereby fixing the encoder circuit board 2 to the circuit board fixing block 3.

[0027] The servo motor uses an interference fit between the positioning pin 31 on the circuit board fixing block 3 and the positioning hole 21 on the encoder circuit board 2, thereby reducing the fit clearance between the encoder circuit board 2 and the circuit board fixing block 3. This improves the concentricity between the encoder circuit board 2 and the motor housing 1, and consequently improves the concentricity between the control chip 4 and the magnetic component 6, resulting in higher control precision for the servo motor and meeting the requirements of high-precision machining. Actual measurements show that the eccentricity between the control chip 4 and the magnetic component 6 of this servo motor generally does not exceed 0.05mm, enabling precise control of the rotation angle of the servo motor shaft 5.

[0028] The circuit board fixing block 3 is a hollow columnar structure. The inner side wall of the circuit board fixing block 3 is provided with a mounting step surface 32. The encoder circuit board 2 is limited and abutted against the mounting step surface 32, and the outer side wall of the encoder circuit board 2 is connected to the side wall of the mounting step surface 32. The mounting step surface 32 limits the installation position of the encoder circuit board 2, thereby facilitating the installation and positioning of the encoder circuit board 2 and the circuit board fixing block 3, improving the convenience of assembly, further improving the concentricity of installation, and thus improving the control accuracy of the motor.

[0029] To facilitate the assembly of the circuit board fixing block 3 and the motor housing 1, a first snap-fit ​​groove 33 is provided on the inner side wall of the circuit board fixing block 3 at a position corresponding to the mounting post 7. During assembly, the first snap-fit ​​groove 33 on the circuit board fixing block 3 is aligned with the mounting post 7 on the motor housing 1, and the mounting post 7 is inserted into the corresponding first snap-fit ​​groove 33, so that the mounting post 7 and the corresponding first snap-fit ​​groove 33 are interference-fitted, thereby fixing the circuit board fixing block 3 and the motor housing 1.

[0030] In this embodiment, there are three mounting posts 7, and the three mounting posts 7 are evenly spaced at the tail end of the motor housing 1. In other embodiments, the number of mounting posts 7 can be any other number.

[0031] To ensure the circuit board fixing block 3 is securely mounted to the motor housing 1, multiple second snap-fit ​​slots 11 are provided at the rear end of the motor housing 1. Snap-fit ​​blocks 34 are respectively positioned on the circuit board fixing block 3 at corresponding positions to the second snap-fit ​​slots 11. During assembly, after the mounting post 7 is inserted into the corresponding first snap-fit ​​slot 33, the snap-fit ​​block 34 is also aligned with the corresponding second snap-fit ​​slot 11. As the mounting post 7 continues to be inserted into the first snap-fit ​​slot 33, the snap-fit ​​blocks 34 will insert into the second snap-fit ​​slots 11 respectively for secure mounting, thereby securing the circuit board fixing block 3 to the motor housing 1 and improving the stability of the structure.

[0032] In this embodiment, there are four snap-fit ​​blocks 34; in other embodiments, the number of snap-fit ​​blocks 34 can be any other number.

[0033] The encoder circuit board 2 has a signal line 9, which is used to connect to external control equipment. One end of the signal line 9 extends out of the motor housing 1. A first sealing element 10 is installed on the motor housing 1, and the first sealing element 10 is sealed to the motor housing 1, the circuit board fixing block 3, and the signal line 9. By setting the first sealing element 10, the wire passage of the signal line 9 can be sealed, reducing the entry of dust, moisture, etc. into the motor and improving the dustproof and waterproof performance of the servo motor.

[0034] In this embodiment, the first sealing element 10 is made of flexible silicone material; in other embodiments, the first sealing element 10 may also be made of other flexible materials, such as rubber.

[0035] like Figure 2 As shown, a motor stator 12 is provided inside the motor housing 1, and a motor rotor 13 is sleeved on the rotating shaft 5. The motor stator 12 is sleeved around the motor rotor 13, and the two are fitted with a clearance fit. The structure of the motor rotor 13 and the motor stator 12 can adopt any existing type, and this utility model does not limit this.

[0036] A speed reducer 14 is provided at the end of the motor housing 1 away from the circuit board fixing block 3. The speed reducer 14 is fixedly connected to the rotating shaft 5. The speed reducer 14 is used to reduce the speed of the servo motor and increase the torque. The speed reducer 14 can adopt any existing speed reducer structure, and this utility model does not limit it.

[0037] The servo motor also includes a brake 15, which is connected to the rotating shaft 5 and electrically connected to the encoder circuit board 2. The brake 15 is used to control the rotating shaft 5 to stop rotating. The brake 15 can be any existing type, and its structure is not limited by this utility model.

[0038] The motor stator 12 is equipped with a power line 16, which passes through the motor housing 1 and is electrically connected to the encoder circuit board 2. A second sealing element 17 is provided on the circuit board fixing block 3, sealingly connecting the second sealing element 17 to the circuit board fixing block 3, the power line 16, and the encoder circuit board 2. By providing the second sealing element 17, the passage of the power line 16 is sealed, reducing the entry of dust and moisture into the motor and improving the dustproof and waterproof performance of the servo motor.

[0039] In this embodiment, the second seal 17 is made of flexible silicone material; in other embodiments, the second seal 17 may also be made of other flexible materials, such as rubber.

[0040] The above-described specific embodiments are preferred embodiments of this utility model, and are not intended to limit the specific scope of this utility model. The scope of this utility model includes but is not limited to the specific embodiments described above. All equivalent changes made in accordance with this utility model are within the protection scope of this utility model.

Claims

1. A servo motor capable of improving control accuracy, characterized by: The device includes a motor housing, an encoder circuit board, and a circuit board fixing block. The circuit board fixing block is connected to the motor housing, and the encoder circuit board is connected to the motor housing through the circuit board fixing block. A control chip is provided at the center of the encoder circuit board. A rotatable shaft is provided inside the motor housing, and a magnetic element is provided at one end of the shaft. The magnetic element is concentrically arranged with the shaft. The motor housing has multiple mounting posts distributed circumferentially at its tail end. Each mounting post is equipped with a fixing screw. The circuit board fixing block is sleeved around the mounting posts. The circuit board fixing block has hollow positioning posts at corresponding positions to the mounting posts. The encoder circuit board has positioning holes at corresponding positions to the positioning posts. The positioning posts pass through the corresponding positioning holes and are interference-fitted with the positioning holes. The fixing screws pass through the positioning posts and are connected to the mounting posts. The fixing screws also abut against the encoder circuit board for limiting.

2. The servo motor capable of improving control accuracy according to claim 1, characterized in that: The circuit board fixing block is a hollow columnar structure. The inner sidewall of the circuit board fixing block is provided with a mounting step surface. The encoder circuit board abuts against the mounting step surface, and the outer sidewall of the encoder circuit board is connected to the sidewall of the mounting step surface.

3. The servo motor capable of improving control accuracy according to claim 2, characterized in that: The inner sidewall of the circuit board fixing block is provided with a first snap-fit ​​groove at a position corresponding to the mounting post. The mounting post is inserted into the corresponding first snap-fit ​​groove, and the mounting post and the first snap-fit ​​groove are interference fit.

4. The servo motor capable of improving control accuracy according to claim 3, characterized in that: There are three mounting posts.

5. The servo motor capable of improving control accuracy according to claim 3, characterized in that: The motor housing has multiple second snap-fit ​​slots at its tail end. The circuit board fixing block has snap-fit ​​blocks at positions corresponding to the second snap-fit ​​slots, and the snap-fit ​​blocks snap into their respective second snap-fit ​​slots.

6. The servo motor capable of improving control accuracy according to claim 1, wherein: The encoder circuit board is provided with a signal line, one end of which extends out of the motor housing. The motor housing is provided with a first sealing element, which is sealed and connected to the motor housing, the circuit board fixing block and the signal line respectively.

7. The servo motor capable of improving control accuracy according to any one of claims 1 to 6, characterized in that: The motor housing contains a motor stator, and the motor rotor is sleeved on the rotating shaft. The motor stator is sleeved around the motor rotor, and the two are fitted with a clearance.

8. The servo motor capable of improving control accuracy according to claim 7, characterized in that: The motor stator is provided with a power line, which passes through the motor housing and is electrically connected to the encoder circuit board. The circuit board fixing block is provided with a second sealing element, which is sealed to the circuit board fixing block, the power line and the encoder circuit board respectively.

9. The servo motor capable of improving control accuracy according to claim 7, characterized in that: A speed reducer is provided at the end of the motor housing away from the circuit board fixing block, and the speed reducer is connected to the rotating shaft.

10. The servo motor capable of improving control accuracy according to claim 7, wherein: It also includes a brake, which is connected to the rotating shaft and electrically connected to the encoder circuit board.

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