Motor rotor positioning structure
By integrating the grating encoder and photoelectric sensor substrate inside the motor, the problems of large volume and signal distortion of the motor positioning structure in the prior art are solved, and the precise positioning effect with lower cost and lower difficulty is achieved.
Patent Information
- Application Number
- CN202420937356.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-04-30
AI Technical Summary
In existing small motors, the motor volume is increased by the positioning structure of magnetic rings and Hall elements, and the assembly accuracy affects signal distortion, resulting in low positioning signal accuracy.
The grating encoder and a sensor substrate with a photoelectric sensor are integrated inside the motor. The tooth change on the grating encoder is converted into a phase difference signal through the photoelectric sensor, and the circuit board output signal is output to achieve accurate positioning.
It achieves lower cost of use and assembly difficulty, while effectively reducing the impact of signal distortion on positioning accuracy and improving positioning accuracy.
Smart Images
Figure CN222215445U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of motor structures and relates to a motor rotor positioning structure. Background Art
[0002] At present, for small motors that need to locate the rotor position, a magnetic ring with magnetic poles is fixed to the rear end of the motor's external shaft. A circuit board with a Hall element is set on the corresponding surface of the magnetic ring. The Hall element senses the change of the magnetic ring and outputs a relative signal to locate the rotor.
[0003] This structure increases the size of the motor, and because the assembly accuracy affects the distance between the magnetic ring and the Hall element, it will cause output signal distortion and affect the accuracy of the positioning signal. Therefore, in order to solve the above problems, it is necessary to integrate the rotor-related positioning structure into the motor, and generate electrical signals by changing the mechanical structure to reduce the impact of signal distortion on positioning accuracy. Summary of the invention
[0004] In order to solve the implementation technical problems, the utility model adopts the following technical solutions:
[0005] A motor rotor positioning structure, comprising: a grating encoder mounted on the motor rotor, the grating encoder being in a columnar structure as a whole, having a plurality of identification teeth arranged along its circumferential direction, each identification tooth having a clearance fit, and at least one of each identification tooth being a positioning tooth;
[0006] The upper end of the grating encoder is provided with a sensor substrate, which is mounted on the motor stator; the lower end of the sensor substrate is provided with a photoelectric sensor arranged at a circumferential position of the grating encoder;
[0007] An output circuit board for realizing the output of photoelectric sensor signals is also formed on the sensor substrate.
[0008] As a further solution of the utility model: the outer diameter of the grating encoder is less than or equal to the outer diameter of the permanent magnet of the motor rotor.
[0009] As a further solution of the utility model: the angle or shape of the positioning tooth portion is different from that of the identification tooth portion.
[0010] As a further solution of the utility model: two or more photoelectric sensors are arranged in the sensor substrate, and each photoelectric sensor is arranged along the circumferential direction of the grating encoder.
[0011] As a further solution of the utility model: a positioning groove for realizing the positioning arrangement of the photoelectric sensor is arranged on the grating encoder.
[0012] The beneficial effects of the utility model are as follows: by integrating a grating encoder and a sensor substrate with a photoelectric sensor inside the motor, the photoelectric sensor can convert the changes in the teeth identified on the grating encoder into a signal with a phase difference, and the signal is output from the output circuit board to the output signal, thereby achieving the effect of accurately positioning the motor rotor according to the signal. Compared with the traditional structural positioning structure, the overall use cost is lower and the assembly difficulty is lower; at the same time, it can effectively reduce the influence of signal distortion on positioning accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the structure of the utility model.
[0014] Figure 2 It is another structural schematic diagram of the utility model.
[0015] Figure 3 It is a schematic diagram of the structure of the grating encoder in the utility model. DETAILED DESCRIPTION
[0016] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. It should be understood that the present application is not limited to the example embodiments disclosed herein. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0017] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0018] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0019] The utility model provides Figures 1 to 3 ,In an embodiment of the utility model, a motor rotor positioning structure includes: a grating encoder 3 mounted on the motor rotor 2;
[0020] The grating encoder 3 is a columnar structure as a whole, and is formed with a plurality of identification teeth 31 arranged along its circumferential direction, and each identification tooth 31 is gap-fitted;
[0021] The upper end of the grating encoder 3 is provided with a sensor substrate 4, which is mounted on the motor stator 1; the lower end of the sensor substrate 4 is provided with a photoelectric sensor 5 arranged at a circumferential position of the grating encoder 3;
[0022] The sensor substrate 4 is also formed with an output circuit board 41 for realizing the signal output of the photoelectric sensor 5;
[0023] During the operation of the motor, the grating encoder 3 will rotate along with the motor rotor 2. During the rotation, the photoelectric sensor 5 converts the change of the identification tooth 31 on the grating encoder 3 into a signal with a phase difference. The signal is output by the output circuit board 41, thereby achieving the effect of accurately positioning the motor rotor 2 according to the signal.
[0024] At least one of the identification teeth 31 is a positioning tooth, which is distinguished from the identification teeth 31 by the difference in angle or shape. The positioning tooth is used as a photoelectric sensor 5 to identify the initial position of the electrical signal of the motor rotor 2, so as to achieve the effect of improving the detection accuracy.
[0025] Furthermore, in order to achieve a more precise control effect, at least two or more photoelectric sensors 5 are arranged on the sensor substrate 4, and each photoelectric sensor 5 is placed at a certain angle along the circumferential direction of the grating encoder 3. A more precise phase difference signal is acquired through multiple photoelectric sensors 5, making the control of the motor rotor 2 more efficient and accurate.
[0026] Furthermore, the grating encoder 3 is provided with a positioning groove 32 for realizing the positioning arrangement of the photoelectric sensor 5. During the installation of the sensor substrate 4, the positioning groove 32 is used for installation and positioning to ensure that the photoelectric sensor 5 can be installed in an accurate initial position.
[0027] Furthermore, in order to improve the structural integrity of the motor rotor 2 , the outer diameter of the grating encoder 3 is less than or equal to the outer diameter of the permanent magnet of the motor rotor 2 .
[0028] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "including a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.
[0029] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A motor rotor positioning structure, characterized in that: include: A grating encoder mounted on the motor rotor, the grating encoder having a columnar structure as a whole, a plurality of identification teeth arranged along its circumferential direction are formed on the grating encoder, each identification tooth portion is clearance-fitted, and at least one of each identification tooth portion is a positioning tooth portion; The upper end of the grating encoder is provided with a sensor substrate, which is mounted on the motor stator; the lower end of the sensor substrate is provided with a photoelectric sensor arranged at a circumferential position of the grating encoder; An output circuit board for realizing the output of photoelectric sensor signals is also formed on the sensor substrate.
2. The motor rotor positioning structure according to claim 1, characterized in that: The outer diameter of the grating encoder is less than or equal to the outer diameter of the permanent magnet of the motor rotor.
3. The motor rotor positioning structure according to claim 1, characterized in that: The angle or shape of the positioning teeth is different from that of the identification teeth.
4. The motor rotor positioning structure according to claim 1, characterized in that: Two or more photoelectric sensors are arranged in the sensor substrate, and each photoelectric sensor is arranged along the circumferential direction of the grating encoder.
5. The motor rotor positioning structure according to claim 1, characterized in that: The grating encoder is provided with a positioning groove for realizing the positioning arrangement of the photoelectric sensor.