Rotating shaft monitoring encoder mechanism for servo motor

Abstract

The utility model relates to the technical field of servo motors, in particular to a rotating shaft monitoring encoder mechanism for a servo motor, which comprises a rotating shaft and an encoding end cover which are movably sleeved, and is characterized in that a shaft support is arranged at the tail end of the rotating shaft, and encoder magnetic steel is arranged on the shaft support; a PCB bracket is arranged on the coding end cover, and a coder PCB is arranged on the outer side of the PCB bracket. The mechanism is simple in structure and easy to assemble and disassemble, the assembling efficiency of products can be effectively improved, and the rotating shaft can be accurately monitored.

Description

Technical Field

[0001] The utility model relates to the technical field of servo motors, in particular to a shaft monitoring encoder mechanism for a servo motor. Background Art

[0002] A servo motor is an engine that controls the operation of mechanical components in a servo system. It is an auxiliary motor indirect speed change device that can convert voltage signals into torque and speed to drive the control object, and has the characteristics of high-precision speed and position control. Its working principle is that the rotation speed of its rotor is controlled by the input signal and can respond quickly. In an automatic control system, the servo motor is used as an actuator, with characteristics such as a small electromechanical time constant, high linearity, and starting voltage, and can convert the received electrical signal into an angular displacement or angular velocity output on the motor shaft. It is widely used in automation equipment that requires precise positioning, high-speed movement, high torque output, high stability, low noise, etc., such as numerical control machine tools, the semiconductor manufacturing field, imaging equipment, packaging equipment, and the robotics field, etc.

[0003] As a type of servo motor, the shaft servo motor, as an important part of the servo system, is responsible for driving mechanical components to operate according to precise control instructions. It can perform electromechanical energy conversion and signal conversion and is a key device for realizing precise motion control. The monitoring of the shaft is generally achieved by a servo motor encoder. The servo motor shaft encoder is a sensor installed on the shaft of the servo motor, mainly used to measure the pole position, the rotation angle and speed of the servo motor. It converts mechanical signals into electrical signals by detecting the position and speed changes of the shaft for use by the control system.

[0004] As a type of servo motor shaft encoder, the magnetic encoder usually consists of two main parts: a reading head and a magnetic disk (or magnetic grating). The reading head is fixed to the object to be measured, while the magnetic disk (or magnetic grating) is connected to the object to be measured and moves with it. A series of evenly distributed north and south pole magnets (or magnetic poles) are installed on the magnetic disk (or magnetic grating). When the disk (or magnetic grating) rotates, these magnets will approach or move away from the reading head, thereby changing the magnetic field strength around it. The reading head contains one or more sensing elements (such as Hall effect sensors, AMR sensors, GMR sensors, etc.) for detecting changes in the nearby magnetic field and sending the detected signals to the signal processing circuit for processing, and finally outputting digital position information.

[0005] On the existing shaft servo motor, since the space for installing this encoder is very small, and the installation structure of the magnetic encoder is complex and has high requirements for installation accuracy, if there is a deviation during the assembly process, it will lead to poor accuracy in monitoring the state of the shaft.

[0006] Therefore, there is an urgent need for a new technical solution to solve the above technical problems. Summary of the Invention

[0007] The purpose of the present utility model is to overcome the problems of the above-mentioned existing technologies, and provides a shaft monitoring encoder mechanism for a servo motor, which is used to solve the technical problems that on a traditional shaft servo motor, the space for installing this encoder is very small, the installation structure of the magnetic encoder is complex, and the requirement for installation accuracy is very high. If there is a deviation during the assembly process, it will lead to poor accuracy in monitoring the state of the shaft.

[0008] The above purpose is achieved through the following technical solutions:

[0009] A shaft monitoring encoder mechanism for a servo motor includes a rotatable shaft and a coding end cover sleeved thereon. An axle support is provided at the end of the shaft, and an encoder magnet is provided on the axle support; a PCB board bracket is provided on the coding end cover, and an encoder PCB board is provided on the outer side of the PCB board bracket.

[0010] Further, the coding end cover includes an end cover through hole arranged coaxially with the shaft, and a bearing groove for embedding a bearing is provided on one side of the end cover through hole; a PCB board bracket groove for embedding the PCB board bracket is provided on the other side of the end cover through hole; the end of the shaft is sleeved with the inner ring of the bearing.

[0011] Further, an axle support slot for inserting the axle support is opened at the axial center position of the end of the shaft; the axle support includes an axle support body having a magnet groove, and a plug post arranged at the axial center position of the axle support body, and the plug post can be inserted into the axle support slot.

[0012] Further, the plug post and the axle support slot are adhesively bonded with glue.

[0013] Further, the PCB board bracket groove is circular, correspondingly, the PCB board bracket is circular; a plurality of bracket threaded holes are opened on the bottom wall of the PCB board bracket groove, a plurality of nut seats are opened on the PCB board bracket, and the bracket threaded holes and the nut seats are screwed together with screws.

[0014] Further, a plurality of support seats flush with the nut seats in height are provided on the outer wall of the PCB board bracket, and a guide post is provided at the axial center position of the top of the support seat; a guide hole matching the guide post and a PCB board threaded hole corresponding to the nut seat are opened on the encoder PCB board.

[0015] Further, both the encoder magnet and the encoder PCB board are circular, and the centers of the circles are coaxially arranged.

[0016] Further, the center of the encoder magnet coincides with the axis of the rotating shaft.

[0017] The rotating shaft monitoring encoder mechanism for a servo motor provided by the present utility model can achieve the change and precise monitoring of the magnetic field during operation by arranging an encoder magnet that can rotate synchronously at the end of the rotating shaft and fixedly connecting an encoder PCB board with an unchanged position on the coding end cover. This mechanism not only has a simple structure, is easy to assemble and disassemble, can effectively improve the assembly efficiency of the product, but also can achieve precise monitoring of the rotating shaft. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the rotating shaft monitoring encoder mechanism for a servo motor according to the present utility model;

[0019] Figure 2 is an exploded view of the rotating shaft monitoring encoder mechanism for a servo motor according to the present utility model;

[0020] Figure 3 is a cross-sectional view of the rotating shaft monitoring encoder mechanism for a servo motor according to the present utility model;

[0021] Figure 4 is an application diagram of the rotating shaft monitoring encoder mechanism for a servo motor according to the present utility model.

[0022] Markings in the drawings:

[0023] 1 - Rotating shaft, 101 - Shaft support slot;

[0024] 2 - Coding end cover, 201 - End cover through hole, 202 - Bearing embedding groove, 203 - PCB board bracket embedding groove, 204 - Bracket threaded hole;

[0025] 3 - Shaft support, 301 - Shaft support body, 302 - Magnet embedding groove, 303 - Insertion post;

[0026] 4 - Encoder magnet;

[0027] 5 - PCB board bracket, 501 - Nut seat, 502 - Support seat, 503 - Guide post;

[0028] 6 - Encoder PCB board, 601 - Guide hole, 602 - PCB board threaded hole;

[0029] 7 - Bearing. Detailed Embodiment

[0030] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. The described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative work belong to the protection scope of the present utility model.

[0031] As Figure 1 , Figure 2 and Figure 4 shown, the shaft monitoring encoder mechanism for a servo motor includes a rotatably sleeved shaft 1 and a coding end cover 2. An axle support 3 is provided at the end of the shaft 1, and an encoder magnet 4 is provided on the axle support; a PCB board bracket 5 is provided on the coding end cover 2, and an encoder PCB board 6 is provided on the outer side of the PCB board bracket 5.

[0032] Working principle:

[0033] When the shaft 1 starts to rotate relative to the coding end cover 2, it will drive the axle support 3 and the encoder magnet 4 on the axle support 3 to rotate synchronously; and the encoder PCB board 6 is always fixedly connected to the coding end cover 2 through the PCB board bracket 5, and its position does not change.

[0034] During the rotation process, the magnetic field of the encoder magnet 4 changes with a series of uniformly distributed north and south pole magnets on the encoder PCB board 6, and the detected signal is obtained by the sensing element and sent to the signal processing circuit for processing, and finally the digital position information is output.

[0035] It should be noted that in this embodiment, the change of the magnetic field interaction between the encoder magnet 4 and the encoder PCB board 6, and the acquisition of the magnetic field signal are all realized by the conventional principle of the magnetic encoder, which is not the protection point of this solution. This solution focuses on the connection structure between the encoder and the axle support and the coding end cover, as well as the protection of the relevant connection components used.

[0036] In order to ensure the monitoring accuracy of the shaft 1, both the encoder magnet 4 and the encoder PCB board 6 are circular and their centers are coaxial.

[0037] The center of the encoder magnet 4 is coaxial with the axis of the shaft 1.

[0038] As Figure 2 and Figure 3 shown, in this embodiment, the coding end cover 2 includes an end cover through hole 201 coaxial with the shaft 1. A bearing groove 202 for embedding a bearing 7 is provided on one side of the end cover through hole 201; a PCB board bracket groove 203 for embedding the PCB board bracket 5 is provided on the other side of the end cover through hole 201;

[0039] The end of the rotating shaft 1 is sleeved with the inner ring of the bearing 7. Under this structure, the rotating shaft 1 can rotate freely relative to the coding end cover 2.

[0040] An axle support slot 101 for inserting the axle support 3 is provided at the axial center position of the end of the rotating shaft 1;

[0041] The axle support 3 includes an axle support body 301 having a magnet embedding slot 302 and an insertion post 303 provided at the axial center position of the axle support body 301. The insertion post 303 can be inserted into the axle support slot 101.

[0042] Specifically, in this embodiment, the magnet embedding slot 302 can clamp the encoder magnet 4. After the insertion post 303 and the axle support slot 101 are inserted into each other, the encoder magnet 4 and the rotating shaft 1 are integrated, and thus can rotate synchronously during the rotation of the rotating shaft 1.

[0043] In order to further increase the connection stability between the axle support 3 and the rotating shaft 1, the insertion post 303 and the axle support slot 101 are adhesively bonded with glue.

[0044] As an optimization of this embodiment, the PCB board support slot 203 is circular, and correspondingly, the PCB board support 5 is circular;

[0045] A plurality of support bracket threaded holes 204 are provided on the bottom wall of the PCB board support slot 203, and a plurality of nut seats 501 are provided on the PCB board support 5. The support bracket threaded holes 204 and the nut seats 501 are screwed together with screws.

[0046] Through the above connection method, the PCB board support 5 can be firmly fixed in the PCB board support slot 203, thereby providing a stable support for the encoder PCB board 6.

[0047] As Figure 2 shown, in this embodiment, a plurality of support seats 502 flush with the nut seats 501 are provided on the outer wall of the PCB board support 5, and a guide post 503 is provided at the axial center position of the top of the support seat 502;

[0048] The encoder PCB board 6 is provided with a guide hole 601 matching the guide post 503 and a PCB board threaded hole 602 corresponding to the nut seat 501.

[0049] Under this structure, for the installation of the encoder PCB board 6, only by aligning its guiding holes 601 with the guiding posts 503 can the quick calibration of the position be completed. Then, the threaded holes 602 of the PCB board, the nut seat 501 and the threaded holes 204 of the bracket are screwed together through screws, so as to realize the screwing connection of the encoder PCB board 6 and the PCB board bracket 5 together with the coding end cover 2. The assembly is quicker and ensures the correspondence of the positions of all components.

[0050] In this embodiment, the purpose of the nut seat 501 and the support seat 502 is to ensure that a certain gap can be formed between the installed encoder PCB board 6 and the encoder magnet 4, so as to better monitor the change of the magnetic field.

[0051] The above is only to illustrate the implementation manner of the present invention and is not used to limit the present invention. For those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A shaft monitoring encoder mechanism for a servo motor, comprising a rotatable shaft (1) and a coding end cover (2) which are movably sleeved, characterized in that: At the end of the rotating shaft (1), a shaft support (3) is provided, and an encoder magnet (4) is provided on the shaft support; on the coding end cover (2), a PCB board bracket (5) is provided, and an encoder PCB board (6) is provided on the outer side of the PCB board bracket (5).

2. The shaft monitoring encoder mechanism for a servo motor according to claim 1, characterized in that: The coding end cover (2) includes an end cover through hole (201) arranged coaxially with the rotating shaft (1), and a bearing embedding groove (202) for embedding a bearing (7) is arranged on one side of the end cover through hole (201); on the other side of the end cover through hole (201), a PCB board bracket embedding groove (203) for embedding the PCB board bracket (5) is arranged; The end of the rotating shaft (1) is sleeved with the inner ring of the bearing (7).

3. The shaft monitoring encoder mechanism for a servo motor according to claim 2, wherein: At the axial center position of the end of the rotating shaft (1), a shaft support slot (101) for inserting the shaft support (3) is provided; The shaft support (3) includes a shaft support body (301) having a magnet embedding groove (302), and a plug post (303) arranged at the axial center position of the shaft support body (301), and the plug post (303) can be inserted into the shaft support slot (101).

4. The shaft monitoring encoder mechanism for a servo motor according to claim 3, characterized in that: The plug post (303) and the shaft support slot (101) are adhesively bonded with glue.

5. The shaft monitoring encoder mechanism for a servo motor according to claim 1, characterized in that: The PCB board bracket embedding groove (203) is circular, and correspondingly, the PCB board bracket (5) is circular; On the bottom wall of the PCB board bracket embedding groove (203), a plurality of bracket threaded holes (204) are provided, on the PCB board bracket (5), a plurality of nut seats (501) are provided, and the bracket threaded holes (204) and the nut seats (501) are screwed together with screws.

6. The shaft monitoring encoder mechanism for a servo motor according to claim 5, characterized in that: On the outer wall of the PCB board bracket (5), a plurality of support seats (502) flush with the nut seats (501) in height are provided, and a guide post (503) is arranged at the axial center position of the top of the support seat (502); On the encoder PCB board (6), a guide hole (601) matching the guide post (503) and a PCB board threaded hole (602) corresponding to the nut seat (501) are provided.

7. The shaft monitoring encoder mechanism for a servo motor according to claim 1, characterized in that: Both the encoder magnet (4) and the encoder PCB board (6) are circular, and their centers are coaxially arranged.

8. The shaft monitoring encoder mechanism for a servo motor according to claim 7, characterized in that: The center of the encoder magnet (4) is coaxially arranged with the axis of the rotating shaft (1).

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