Encoder and motor with same
By designing the positioning grooves and reference planes on the encoder brackets and trays, and using the groove width gradient characteristics to achieve free drop and installation of the pallets, the problems of positioning accuracy and structural complexity of the existing encoder are solved, and measurement accuracy and reliability are improved.
Patent Information
- Application Number
- CN202421150703.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-24
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-05-24
AI Technical Summary
Existing encoders have problems with the positioning accuracy and structural complexity of brackets and pallets, resulting in low measurement accuracy and reliability.
An encoder is designed to position the positioning groove on the inner wall of the bracket and the reference surface on the rear end of the pallet. When installing the pallet, the groove width and width of the positioning groove along the axial front end direction can be freely dropped on the rotating shaft for fixed installation.
Improves the positioning accuracy of the bracket and pallet, simplifies the structure, reduces costs, and improves the installation accuracy and performance of the encoder.
Smart Images
Figure CN222582227U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electrical equipment, in particular to an encoder and a motor with the encoder. Background Art
[0002] When using and installing the motor, the encoder is often connected to the motor body to provide position feedback through the encoder. For the installation of the encoder, it is usually required that the sensor on the printed circuit board fixed on the bracket corresponds to the position of the unit to be sensed on the tray that is finally fixed to the shaft. For example, the Hall sensor is required to correspond to the position of the permanent magnet, or the optical chip is required to correspond to the position of the grating, to ensure the measurement accuracy and reliability of the encoder. Therefore, the encoder usually needs to position and fix the bracket and tray before leaving the factory. Unfortunately, the existing structure or assembly method has the disadvantages of poor positioning accuracy or complex structure. Summary of the invention
[0003] In view of the above, a first aspect of an embodiment of the present application is to provide an encoder, aiming to solve the problem of poor positioning accuracy or complex structure of brackets and trays existing in the prior art.
[0004] The encoder comprises: a bracket, a front end of the bracket is used to be fixedly connected to the motor body, the bracket is provided with a accommodating cavity, a sensor is provided in the accommodating cavity, and the sensor is fixedly installed on the bracket; a tray, the tray is arranged in the accommodating cavity and is provided with a sensing unit corresponding to the sensor, the tray is fixedly connected to the bracket before installation and is located at the rear end of the rotating shaft when installed; wherein, a positioning groove is provided on the inner wall of the bracket, and a reference surface adapted to the inner wall of the positioning groove is provided at the rear end of the tray, the reference surface is used to fit with the inner wall of the positioning groove to locate the position where the tray is fixed to the bracket, and the groove width of the matching part of the positioning groove and the reference surface gradually widens along the axial front end direction, so that the reference surface is separated from the inner wall of the positioning groove when the tray is fixedly installed on the rotating shaft.
[0005] Preferably, the tray is provided with a first mounting hole, and the first mounting hole is used for a first fixing member to enter so as to fix the tray on the rear end surface of the rotating shaft.
[0006] Preferably, a second mounting hole is provided on the rear end plate of the bracket, and the first mounting hole corresponds to the second mounting hole in position, so that a second fixing member can enter through the second mounting hole to achieve a fixed connection between the tray and the bracket.
[0007] Preferably, the first mounting hole is a first threaded hole, and the first fixing member is a first screw, one end of which is used to pass through the first threaded hole and be threadedly connected to a second threaded hole arranged on the rear end surface of the rotating shaft.
[0008] Preferably, a size of the first threaded hole is larger than a size of the second threaded hole.
[0009] Preferably, the second mounting hole is a through hole, the first mounting hole is a screw hole, and the second fixing member is a second screw, one end of which is used to pass through the through hole and be screwed to the first threaded hole.
[0010] Preferably, the reference surface is a conical surface, a spherical surface or an inclined surface.
[0011] Preferably, the tray is provided with a receiving groove for the rear end of the rotating shaft to enter, and the first mounting hole is arranged on the bottom plate of the receiving groove.
[0012] A second aspect of the embodiments of the present application further provides a motor, comprising a motor body and an encoder as described in any of the above embodiments, wherein the motor body is provided with a rotating shaft, and the rear end of the rotating shaft extends into the accommodating cavity for fixed installation of the tray.
[0013] Preferably, the tray is provided with a first threaded hole, the first fixing member is a first screw, and the rear end surface of the rotating shaft is provided with a second threaded hole for threading with the first screw passing through the first threaded hole.
[0014] The beneficial effects of the encoder provided in the embodiment of the present application are that, on the one hand, by setting a reference surface for positioning, the positioning accuracy of the bracket and the tray during assembly is greatly improved, and there is no need to use other auxiliary devices for positioning, which simplifies the structure and reduces costs; on the other hand, by setting the positioning groove to gradually widen along the axial front end direction, the tray can fall freely onto the rotating shaft during installation and then be fixed and installed, which improves the positioning accuracy of the encoder when it is installed. At the same time, the tray is detached from the bracket when it is installed to avoid friction, thereby improving the performance of the encoder. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0016] Figure 1 A cross-sectional view of the structure of the encoder provided in an embodiment of the present application;
[0017] Figure 2 A structural cross-sectional view of an encoder of a motor provided in an embodiment of the present application before installation;
[0018] Figure 3 A cross-sectional view of the structure of the motor after the encoder is installed provided in an embodiment of the present application;
[0019] Figure 4 An exploded cross-sectional view of the structure of the encoder of the motor provided in an embodiment of the present application before installation;
[0020] Description of reference numerals:
[0021] 10-encoder; 11-bracket; 12-tray; 13-printed circuit board; 20-motor; 21-motor body; 30-first fixing member; 40-second fixing member; 50-third screw; 110-accommodating chamber; 111-positioning groove; 112-rear end plate; 113-second mounting hole; 114-third mounting hole; 120-unit to be sensed; 121-reference plane; 122-first mounting hole; 123-accommodating groove; rotating shaft-210; 211-second threaded hole; third threaded hole 212. DETAILED DESCRIPTION
[0022] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.
[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.
[0024] The first aspect of the embodiment of the present application provides an encoder 10, referring to Figure 1-Figure 4 The encoder 10 comprises: a bracket 11, the front end of which is used to be fixedly connected to the motor body 21, the bracket 11 is provided with a receiving cavity 110, the receiving cavity 110 is provided with a sensor, and the sensor is fixedly installed on the bracket 11; a tray 12, the tray 12 is arranged in the receiving cavity 110 and is provided with a to-be-sensed unit 120 corresponding to the sensor, the tray 12 is used to be detachably fixedly connected to the bracket 11 before installation and is located at the rear end of the rotating shaft 210 when installed; wherein, a positioning groove 111 is provided on the inner wall of the bracket 11, and a reference surface 121 adapted to the inner wall of the positioning groove is provided at the rear end of the tray 12, the reference surface 121 is used to fit with the inner wall of the positioning groove 111 to locate the position where the tray 12 is fixed to the bracket 11, and the groove width of the matching part of the positioning groove 111 and the reference surface 121 is gradually widened along the axial front end direction, so that when the tray 12 is fixedly installed on the rotating shaft 210, the reference surface 121 is separated from the inner wall of the positioning groove 111.
[0025] The beneficial effects of the encoder 10 provided in the embodiment of the present application are that, on the one hand, by setting the reference surface 121 for positioning, the positioning accuracy of the bracket 11 and the tray 12 during assembly is greatly improved, and there is no need to use other auxiliary devices for positioning, which simplifies the structure and reduces the cost; on the other hand, by setting the positioning groove 111 to gradually widen the groove width along the axial front end direction, the tray 12 can fall freely onto the rotating shaft 210 during installation and then be fixed and installed, which improves the positioning accuracy of the encoder 10 when it is installed. At the same time, the tray 12 is detached from the bracket when the installation is completed to avoid friction, thereby improving the performance of the encoder.
[0026] It should be understood that the "front end" and "rear end" referred to in the embodiments of the present application are consistent with the front and rear end directions of the motor, that is, the end relatively close to the front end cover of the motor is the "front end", and the end relatively far away from the front end cover of the motor is the "rear end".
[0027] As one example, see Figure 1-Figure 4 The encoder 10 further includes a printed circuit board 13 , which is disposed in the accommodating cavity 110 and whose side ends are fixedly mounted on the inner wall of the bracket 11 , and the sensor is disposed on the end surface of the printed circuit board 13 .
[0028] As some examples, the sensor may be a Hall sensor for a magnetic encoder, and correspondingly, the unit to be sensed may be a magnetic ring composed of a permanent magnet. The sensor may also be an optical chip for an optical encoder, and correspondingly, the unit to be sensed may be a code disk composed of a grating. Furthermore, the sensor may also include a Hall sensor and an optical chip at the same time, and correspondingly, the unit to be sensed includes a magnetic ring and a code disk. As one example, refer to Figure 1 , Figure 2 and Figure 4 , which are respectively a cross-sectional view and an exploded cross-sectional view of the motor 20 after the encoder 10 is assembled and before being installed on the motor body 21. The tray 12 is provided with a first mounting hole 122, and the rear end plate 112 of the bracket 11 is provided with a second mounting hole 113. The first mounting hole 122 corresponds to the second mounting hole 113, so that the second fixing member 40 passing through the second mounting hole 113 can enter and realize the fixed connection between the tray 12 and the bracket 11.
[0029] As one example, the first mounting hole 122 is a first threaded hole, the second mounting hole 113 is a through hole, and the second fixing member 40 is a second screw, one end of which is used to pass through the through hole and be screwed to the first threaded hole, thereby achieving a fixed connection between the tray 12 and the bracket 11.
[0030] It should be understood that the fixed connection method between the tray 12 and the bracket 11 is not limited to the above-mentioned threaded connection method, and can also be set to be bonded by glue, that is, the second fixing member 40 is glue, or the fixed connection is achieved by engaging a hook with a groove.
[0031] As one example, see Figure 1 and Figure 4 , the reference surface 121 is set as a conical surface. It can be understood that the inner wall of the positioning groove 111 adapted thereto is also set as a conical surface, and the tip of the conical surface of the inner wall of the positioning groove 111 is located at the front end of the positioning groove or in front of the positioning groove. Specifically, when assembling the encoder 10, the specific position of the tray 12 fixed to the bracket 11 is accurately determined by fitting the conical surface of the tray 12 with the conical surface of the inner wall of the positioning groove 111, that is, the positioning before installation is completed. At this time, the sensing unit and the sensor are exactly in position. After the fixed position is determined, it is locked by the second screw to complete the assembly of the encoder.
[0032] It should be understood that the reference surface 121 may also be set as a spherical surface or an inclined surface, which is not limited in the embodiment of the present disclosure.
[0033] As one example, see Figure 1-Figure 3 , which is a structural cross-sectional view of the motor 20 after the encoder 10 is installed on the motor body 21. The motor body 21 is provided with a rotating shaft 210, the rear end of which extends into the accommodating cavity 110 of the bracket 11, a second threaded hole 211 is provided on the rear end surface of the rotating shaft 210, a third threaded hole 212 is provided on the rear end surface of the motor body 21, and third mounting holes 114 corresponding to the positions of the third threaded holes 212 are provided on both sides of the front end of the bracket 11 of the encoder 10. Specifically, when installing the encoder 10, the third screw 50 is passed through the third mounting hole 114 and screwed to the third threaded hole 212, and the bracket 11 of the assembled encoder 10 is fixed to the rear end surface of the motor body 21. The motor 20 is placed with the front end facing vertically downward, and the second screw is removed. The tray 12 falls freely to the rear end surface of the rotating shaft 210. At this time, the second threaded hole 211 corresponds to the position of the first threaded hole. Through the first fixing member 30, preferably the first screw, one end of which passes through the first threaded hole and is screwed to the second threaded hole 211, the tray 12 is fixedly installed on the rotating shaft 210 to complete the installation of the encoder 10.
[0034] It should be understood that the way the tray 12 is fixedly mounted on the shaft 210 is also not limited to the above-mentioned threaded connection method, and can also be set to be bonded by glue, that is, the first fixing member 30 is glue, or a fixed connection is achieved by engaging a hook with a groove.
[0035] It is understandable that the tray 12 and the bracket 11 should have a preset height so that when the tray 12 is fixedly mounted on the rotating shaft 210 , the reference surface 121 can be separated from the inner wall of the positioning groove 121 .
[0036] In the encoder 10 provided in the embodiment of the present application, the tray 12 is fixedly installed on the rear end face of the rotating shaft 210. Compared with the prior art method of fixing and installing by screwing in a top screw from the side, this can effectively prevent the tray from jumping out of the surface, thereby further improving the positioning accuracy and reliability of the encoder.
[0037] As one example, the size of the first threaded hole is set to be larger than the size of the second threaded hole 211, so that when the encoder 10 is installed, the first threaded hole is equivalent to a through hole, which can reduce the process accuracy requirements of the threaded hole while ensuring the fixing effect.
[0038] As one example, see Figure 1-Figure 4 The tray 12 is provided with a receiving groove 123 for the rear end of the rotating shaft 210 to enter, and the first mounting hole 122 is provided on the bottom plate of the receiving groove 123. By providing the receiving groove 123 for the rear end of the rotating shaft 210 to enter, the positioning accuracy of the encoder 10 when it is installed is further improved.
[0039] The present application also provides a motor 20, referring to Figure 1-Figure 4 The motor 20 includes a motor body 21 and an encoder 10 of any of the above embodiments. The motor body 21 is provided with a rotating shaft 210 , and the rear end of the rotating shaft 210 extends into the accommodating cavity 110 for fixing and installing the tray 12 .
[0040] As one example, see Figure 2 and Figure 3 The tray 12 is provided with a first threaded hole, the first fixing member 30 is a first screw, and a second threaded hole 211 is provided on the rear end surface of the rotating shaft 210 for threading with the first screw passing through the first threaded hole.
[0041] The beneficial effects of the motor 20 provided in the embodiment of the present application are that, on the one hand, by setting the reference surface 121 for positioning, the positioning accuracy of the encoder bracket 11 and the tray 12 during assembly is greatly improved, and there is no need to use other auxiliary devices for positioning, which simplifies the structure and reduces the cost of the motor; on the other hand, by setting the positioning groove 111 to gradually widen the groove width along the axial front end direction, the encoder tray 12 can fall freely onto the rotating shaft 210 during installation and then be fixed and installed, which improves the positioning accuracy of the encoder 10 when the installation is completed. At the same time, the tray 12 is detached from the bracket when the installation is completed to avoid friction and improve the performance of the motor.
[0042] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.
Claims
1. An encoder, characterized in that: The encoder comprises: A bracket, wherein the front end of the bracket is used for fixed connection with the motor body, the bracket is provided with a receiving cavity, the receiving cavity is provided with a sensor, and the sensor is fixedly mounted on the bracket; A tray, the tray is arranged in the accommodating cavity and is provided with a to-be-sensed unit corresponding to the sensor, the tray is fixedly connected to the bracket before installation and is located at the rear end of the rotating shaft during installation; In which, a positioning groove is provided on the inner wall of the bracket, and a reference surface adapted to the inner wall of the positioning groove is provided on the rear end of the tray, and the reference surface is used to fit with the inner wall of the positioning groove to locate the position of the tray fixed to the bracket, and the groove width of the matching part between the positioning groove and the reference surface gradually widens along the axial front end direction, so that the reference surface is separated from the inner wall of the positioning groove when the tray is fixedly installed on the rotating shaft.
2. The encoder according to claim 1, characterized in that The tray is provided with a first mounting hole, and the first mounting hole is used for a first fixing member to enter so as to fix the tray on the rear end surface of the rotating shaft.
3. The encoder according to claim 2, characterized in that A second mounting hole is provided on the rear end plate of the bracket, and the first mounting hole corresponds to the second mounting hole in position, so that a second fixing member can enter through the second mounting hole to achieve a fixed connection between the tray and the bracket.
4. The encoder according to claim 2, characterized in that The first mounting hole is a first threaded hole, and the first fixing member is a first screw, one end of which is used to pass through the first threaded hole and be threadedly connected with a second threaded hole arranged on the rear end surface of the rotating shaft.
5. The encoder according to claim 4, characterized in that The size of the first threaded hole is greater than the size of the second threaded hole.
6. The encoder according to claim 3, characterized in that The second mounting hole is a through hole, the first mounting hole is a first threaded hole, and the second fixing member is a second screw, one end of which is used to pass through the through hole and be threadedly connected to the first threaded hole.
7. The encoder according to any one of claims 1 to 6, characterized in that: The reference surface is a conical surface, a spherical surface or an inclined surface.
8. The encoder according to any one of claims 2 to 6, characterized in that: The tray is provided with a receiving groove for the rear end of the rotating shaft to enter, and the first mounting hole is arranged on the bottom plate of the receiving groove.
9. A motor, characterized in that: It comprises a motor body and an encoder as described in any one of claims 1 to 8, wherein the motor body is provided with a rotating shaft, and the rear end of the rotating shaft extends into the accommodating cavity for fixed installation of the tray.
10. The motor according to claim 9, characterized in that The tray is provided with a first threaded hole, and the rear end surface of the rotating shaft is provided with a second threaded hole for threading with a first screw passing through the first threaded hole.