Rotor speed and position detection component and generator

Abstract

The utility model provides a rotor speed and position detection component and a generator. The rotor speed and position detection component includes a rotor and a detection unit. One end face of the rotor is provided with an annular detection area. The detection area is provided with a plurality of reflective detection blocks and extinction detection blocks alternately distributed along the annular shape. The PCB board and the photoelectric sensor are fixed to one side of the rotor through a mounting bracket, and the detection end of the photoelectric sensor faces the detection area. During operation, the rotor rotates. When the rotor rotates so that the detection end of the photoelectric sensor faces the reflective detection block, the photoelectric sensor can receive a light signal. When the rotor rotates so that the detection end of the photoelectric sensor faces the extinction detection block, the photoelectric sensor cannot receive a light signal. In this way, the position of the rotor can be detected by the photoelectric sensor, and the speed of the rotor can be calculated by the frequency of the generated induction signal. The utility model has a simpler structure, and the detection result is more stable and reliable, which helps to achieve precise control of the rotor.

Description

Technical Field

[0001] The utility model belongs to the technical field of rotor detection, and in particular relates to a rotor speed and position detection component and a generator. Background Art

[0002] In the field of generator or motor control, it is very important to accurately detect the position of the motor rotor, because this can help the controller apply the appropriate current and voltage to the generator at the right time, so that the generator can achieve the ideal speed and torque output. Position sensors are key components for detecting rotor position, and their types include magnetic, electromagnetic, photoelectric, etc. Among them, photoelectric position sensors are light and reliable, with high installation accuracy, strong anti-interference ability, and easy adjustment, so they have been widely used.

[0003] The traditional photoelectric position sensor is composed of an infrared light-emitting diode, a phototransistor and a shading plate. The infrared light-emitting diode and the phototransistor are arranged opposite to each other, and the shading plate is located between the light-emitting diode and the phototransistor, and a window is opened on the plate. When the infrared light-emitting diode is powered on, it emits infrared light. When the shading plate rotates with the rotor, the infrared light intermittently shines on the phototransistor, causing it to be continuously turned on and off, and its output signal reflects the position and rotation speed of the rotor. This structure requires the shading plate to be fixed on the rotor so that the shading plate can rotate with the rotor. The structure is relatively complex, and excessively high rotor speed may cause the shading plate to deform or fall off, which is unstable. Utility Model Content

[0004] The utility model provides a rotor speed and position detection component and a generator, aiming to solve the problems of the photoelectric position sensor in the prior art that the structure is complex, the installation is inconvenient and there is a risk in use.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] In a first aspect, the utility model provides a rotor speed and position detection assembly, comprising:

[0007] A rotor, wherein one end surface of the rotor is provided with a detection area, the detection area is annular and coaxial with the rotor, the detection area is alternately formed with reflection detection blocks and extinction detection blocks along the circumferential direction, and the reflection detection blocks and the extinction detection blocks correspond to the magnetic poles one by one; and

[0008] The detection unit includes a mounting bracket, a PCB board and a photoelectric sensor. The mounting bracket is arranged at one end of the rotor where a detection area is provided. The mounting bracket is provided with a through receiving groove along the axial direction of the rotor. The PCB board is arranged on the mounting bracket. The photoelectric sensor is arranged on the PCB board and received in the receiving groove. The detection end of the photoelectric sensor faces the detection area.

[0009] In a possible implementation, the detection area includes six light reflection detection blocks and six light extinction detection blocks, and the light reflection detection blocks and the light extinction detection blocks are alternately arranged along the circumference of the rotor.

[0010] In a possible implementation, the reflective detection block is a high-reflective paint coating sprayed on the end surface of the rotor, and the extinction detection block is an extinction paint coating sprayed on the end surface of the rotor.

[0011] In a possible implementation, the reflective detection block is a sticker coated with a reflective material, and the extinction detection block is a sticker coated with an extinction material.

[0012] In a possible implementation, adjacent reflection detection blocks and extinction detection blocks are arranged at an interval of 30° along the circumferential direction.

[0013] In a possible implementation manner, a first fixing hole is formed on the mounting bracket.

[0014] In a possible implementation, the PCB board is provided with a second fixing hole, the mounting bracket is provided with a threaded fixing hole, and the second fixing hole is coaxially corresponding to the threaded fixing hole.

[0015] In a possible implementation, the photoelectric sensors are provided in plurality, and the plurality of photoelectric sensors are respectively provided on the PCB board and spaced apart along the circumferential direction, and the mounting bracket is provided with a plurality of accommodating grooves spaced apart, and the accommodating grooves correspond one-to-one to the photoelectric sensors.

[0016] In a possible implementation, two adjacent photoelectric sensors are spaced 20° apart.

[0017] Compared with the prior art, the rotor speed and position detection assembly provided by the utility model has the following beneficial effects:

[0018] The rotor speed and position detection assembly provided by the utility model includes a rotor and a detection unit, one end face of the rotor is provided with an annular detection area, the detection area is coaxially corresponding to the rotor, and the detection area is provided with a plurality of reflective detection blocks and extinction detection blocks alternately distributed along the annular shape, and the PCB board and the photoelectric sensor are fixed on one side of the rotor through the mounting bracket, and the detection end of the photoelectric sensor faces the detection area. During operation, the rotor rotates, and when the rotor rotates to make the detection end of the photoelectric sensor face the reflective detection block, the photoelectric sensor can receive the light signal, and when the rotor rotates to make the detection end of the photoelectric sensor face the extinction detection block, the photoelectric sensor cannot receive the light signal, so that the position of the rotor can be detected by the photoelectric sensor, and the speed of the rotor can be calculated by the frequency of the generated induction signal. The photoelectric sensor transmits the detected signal to the system through the PCB board, and the system transmits the stator drive current according to these signals to realize the directional start and rotation of the rotor.

[0019] The utility model can control whether the photoelectric sensor can successfully receive the light signal by setting the reflection detection block and the extinction detection block on the end face of the rotor, replacing the shading plate in the prior art, and has a simpler structure, and no additional shading plate installation structure is required on the rotor. On the one hand, the rotor structure is simplified, which helps to reduce the number of parts, simplify the assembly process, and reduce the manufacturing cost. On the other hand, there is no risk of the shading plate falling or deforming when the rotor rotates at high speed, and the detection result is more stable and reliable, which helps to achieve precise control of the rotor.

[0020] In a second aspect, the utility model further provides a generator, comprising:

[0021] shell;

[0022] a stator shaft disposed in the housing; and

[0023] In the rotor speed and position detection assembly as described in any of the above implementations, the rotor is coaxially arranged on the outer periphery of the stator shaft, and the mounting bracket is arranged on the stator shaft.

[0024] The generator provided by the utility model adopts the rotor speed and position detection component provided by any of the above-mentioned implementation methods, and has the same technical effects as the above-mentioned ones, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the structure of a rotor speed and position detection assembly provided in one embodiment of the utility model Figure 1 ;

[0026] Figure 2 The structure diagram of the rotor speed and position detection assembly provided in one embodiment of the utility model Figure 2 ;

[0027] Figure 3 for Figure 2 Cross-sectional view along the AA direction.

[0028] Description of reference numerals:

[0029] 1. Rotor speed and position detection assembly; 10. Rotor; 11. Reflection detection block; 12. Extinction detection block; 20. Detection unit; 21. Mounting bracket; 211. Accommodation groove; 212. First fixing hole; 22. PCB board; 221. Second fixing hole; 23. Photoelectric sensor; 30. Stator shaft; 40. Magnetic bearing. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] It should be noted that when an element is referred to as being "fixed to", "fixed" or "fixedly disposed" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" or "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. When an element is referred to as being "set to" or "disposed on" another element, it may be directly on the other element or there may be a central element. "Multiple" refers to two or more quantities. "At least one" refers to one or more quantities. "Several" refers to one or more quantities.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0033] Please also read Figures 1 to 3 , the rotor speed and position detection component 1 and the generator provided in the embodiment of the utility model are described below.

[0034] See also Figure 1 , Figure 2 and Figure 3In the first aspect, the embodiment of the utility model provides a rotor speed and position detection assembly 1, comprising a rotor 10 and a detection unit 20, wherein the detection unit 20 comprises a mounting bracket 21, a PCB board 22 and a photoelectric sensor 23. A detection area is provided on one end surface of the rotor 10, the detection area is annular and coaxial with the rotor 10, and the detection area is alternately formed with reflection detection blocks 11 and extinction detection blocks 12 along the circumferential direction, and the reflection detection blocks 11 and the extinction detection blocks 12 correspond to the magnetic poles one by one; the detection unit 20 comprises a mounting bracket 21, a PCB board 22 and a photoelectric sensor 23, the mounting bracket 21 is provided at one end of the rotor 10 where the detection area is provided, the mounting bracket 21 is provided with a through receiving groove 211 along the axial direction of the rotor 10, the PCB board 22 is provided on the mounting bracket 21, the photoelectric sensor 23 is provided on the PCB board 22 and is received in the receiving groove 211, and the detection end of the photoelectric sensor 23 faces the detection area.

[0035] Compared with the prior art, the rotor speed and position detection assembly 1 provided in the embodiment of the utility model has the following beneficial effects:

[0036] The rotor speed and position detection assembly 1 provided by the embodiment of the utility model comprises a rotor 10 and a detection unit 20, one end face of the rotor 10 is provided with an annular detection area, the detection area is coaxially corresponding to the rotor 10, and the detection area is alternately distributed with a plurality of reflective detection blocks 11 and extinction detection blocks 12 along the annular shape, the PCB board 22 and the photoelectric sensor 23 are fixed on one side of the rotor 10 through the mounting bracket 21, and the detection end of the photoelectric sensor 23 faces the detection area. During operation, the rotor 10 rotates, and when the rotor 10 rotates to make the detection end of the photoelectric sensor 23 face the reflective detection block 11, the photoelectric sensor 23 can receive the light signal, and when the rotor 10 rotates to make the detection end of the photoelectric sensor 23 face the extinction detection block 12, the photoelectric sensor 23 cannot receive the light signal, so that the position of the rotor 10 can be detected by the photoelectric sensor 23, and the speed of the rotor 10 can be calculated by the generated frequency of the induction signal. The photoelectric sensor 23 transmits the detected signal to the system through the PCB board 22, and the system transmits the stator shaft 30 driving current according to these signals to realize the directional start and rotation of the rotor 10.

[0037] The embodiment of the utility model can control whether the photoelectric sensor 23 can successfully receive the light signal by setting the reflection detection block 11 and the extinction detection block 12 on the end surface of the rotor 10, replacing the shading plate in the prior art, and has a simpler structure, and there is no need to set an additional shading plate installation structure on the rotor 10. On the one hand, the structure of the rotor 10 is simplified, which helps to reduce the number of parts, simplify the assembly process, and reduce the manufacturing cost. On the other hand, there is no risk of the shading plate falling or deforming when the rotor 10 rotates at high speed, and the detection result is more stable and reliable, which helps to achieve precise control of the rotor 10.

[0038] In the embodiment of the utility model, the rotor 10 is a motor or generator rotor 10. The rotor 10 is a rotating part, and can be divided into two types of internal rotation and external rotation in terms of installation form. In the internal rotation mode, the rotor 10 is coaxially arranged inside the stator shaft 30, and in the external rotation mode, the rotor 10 is coaxially arranged outside the stator shaft 30.

[0039] A detection area is provided at the end of the rotor 10, and the detection area can be a sticker or a coating. The detection area is divided into multiple reflective detection blocks 11 and multiple extinction detection blocks 12. The reflective detection blocks 11 can reflect light, and the extinction detection blocks 12 can absorb light. The extinction detection blocks 12 and the reflective detection blocks 11 are alternately arranged, and the photoelectric sensor 23 can detect the position of the rotor 10.

[0040] The photoelectric sensor 23, also known as a photoelectric coupler, is arranged on the PCB board 22, and one or more photoelectric sensors 23 can be arranged as needed. When multiple photoelectric sensors 23 are provided, the multiple photoelectric sensors 23 are arranged at intervals along the circumference. For example, in a specific embodiment, three photoelectric sensors 23 are arranged on the PCB board 22, and the multiple photoelectric sensors 23 are distributed around the rotor 10 and correspond to its magnetic poles. Each magnetic pole on the rotor 10 is sprayed with matte paint and high reflective paint so that the photoelectric sensor 23 can detect its position. The photoelectric sensor 23 transmits the detected signal to the stator shaft 30, and the stator shaft 30 drives the current according to these signals to achieve directional start and rotation of the rotor 10. When rotating at high speed, the system can compensate the signal through a program to offset the delay and ensure accurate control of the rotor 10.

[0041] In the embodiment of the utility model, the mounting bracket 21 is used to install and fix the PCB board 22 and the photoelectric sensor 23. The pins of the photoelectric sensor 23 are welded on the PCB board 22. The mounting bracket 21 can be connected to the stator shaft 30 or the generator housing. There is no restriction on the specific shape of the mounting bracket 21. It can be set inside the housing without interfering with other parts.

[0042] It should be noted that the mounting bracket 21 can be fixed by screws, welding, bonding, etc. Figure 1 The connector between the mounting bracket 21 and the stator shaft 30 is not shown. The PCB board 22 and the photoelectric sensor 23 can be directly selected from existing products on the market, and there is no restriction on their specific specifications and models.

[0043] See also Figure 1 and Figure 2 In some possible embodiments, the detection area includes six light reflection detection blocks 11 and six light extinction detection blocks 12 , and the light reflection detection blocks 11 and the light extinction detection blocks 12 are alternately arranged along the circumference of the rotor 10 .

[0044] See also Figure 1 and Figure 2In some possible embodiments, the reflective detection block 11 is a high-reflective paint coating sprayed on the end surface of the rotor 10, and the extinction detection block 12 is an extinction paint coating sprayed on the end surface of the rotor 10. The extinction detection block 12 and the reflective detection block 11 are obtained by spraying paint and will not fall off.

[0045] In addition to obtaining the reflective detection block 11 and the extinction detection block 12 by the above-mentioned spray painting method, in some possible embodiments, the reflective detection block 11 is a sticker coated with a reflective material, and the extinction detection block 12 is a sticker coated with an extinction material. The sticker is fixed to the axial end face of the rotor 10 by gluing, which is simple and convenient to operate.

[0046] See also Figure 1 and Figure 2 In some possible embodiments, adjacent reflection detection blocks 11 and extinction detection blocks 12 are arranged at intervals of 30° along the circumferential direction, which is suitable for a rotor 10 with 6 pairs of magnetic poles.

[0047] See also Figure 1 and Figure 2 In some possible embodiments, a first fixing hole 212 is formed on the mounting bracket 21 , and the first fixing hole 212 is used to set a bolt to fix it to the stator shaft 30 or the housing.

[0048] See also Figure 1 and Figure 2 In some possible embodiments, the PCB board 22 is provided with a second fixing hole 221, and the mounting bracket 21 is provided with a threaded fixing hole. The second fixing hole 221 corresponds coaxially to the threaded fixing hole. The second fixing hole 221 is used to pass a screw. The screw is threadedly matched with the threaded fixing hole, and the PCB board 22 can be fixed to the mounting bracket 21 by the screw.

[0049] See also Figure 1 and Figure 2 In some possible embodiments, a plurality of photoelectric sensors 23 are provided, and the plurality of photoelectric sensors 23 are respectively provided on the PCB board 22 and spaced apart along the circumferential direction. The mounting bracket 21 is spaced apart and provided with a plurality of accommodating grooves 211 , and the accommodating grooves 211 correspond one by one to the photoelectric sensors 23 .

[0050] In a specific embodiment, three photoelectric sensors 23 are provided, each for detecting the position of the rotor 10. Each sensor corresponds to a pair of magnetic poles on the rotor 10, and there are six pairs of magnetic poles in total. Each pair of magnetic poles is 30 degrees apart and corresponds to the NS level. The end surface of the rotor 10 is sprayed with matte paint and high reflective paint so that the sensor can detect the position. The sensor drives the rotor 10 to rotate by transmitting a signal to the stator shaft 30. There are also six pairs of magnetic poles on the stator shaft 30, and the current direction is controlled according to the sensor signal, thereby driving the rotor 10 to rotate. Please refer to Figure 1 and Figure 2 In some possible embodiments, two adjacent photoelectric sensors 23 are spaced 20° apart. The signal phase difference between the photoelectric sensors 23 is 20 degrees, so that the signal transmission is delayed when rotating at high speed. In order to offset the delay, the stator shaft 30 can be corrected by giving a compensation signal when the rotation speed is too fast. The sensor phase difference is 20 degrees, so the waveform of each sensor displayed on the oscilloscope differs by 120 degrees. The system starts the rotor 10 directionally by detecting the signal, and performs signal compensation through a program at high speed to offset the delay.

[0051] In the second aspect, an embodiment of the utility model provides a generator, including a rotor speed and position detection component 1, a casing, a stator shaft 30 and a rotor 10 as provided in any of the above embodiments, the stator shaft 30 is arranged in the casing, the rotor 10 is coaxially arranged on the outer periphery of the stator shaft 30, the mounting bracket 21 is arranged on the stator shaft 30, and a magnetic bearing 40 can be arranged on the stator shaft 30.

[0052] It can be understood that the various parts in the above-mentioned embodiments can be freely combined or deleted to form different combination embodiments. The specific contents of each combination embodiment will not be repeated here. After this description, it can be considered that the utility model specification has recorded various combination embodiments and can support different combination embodiments.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rotor speed and position detection component, characterized in that: include: A rotor, wherein one end surface of the rotor is provided with a detection area, the detection area is annular and coaxial with the rotor, and the detection area is alternately formed with reflection detection blocks and extinction detection blocks along the circumferential direction, and the reflection detection blocks and the extinction detection blocks correspond to the magnetic poles one by one; as well as The detection unit includes a mounting bracket, a PCB board and a photoelectric sensor. The mounting bracket is arranged at one end of the rotor where a detection area is provided. The mounting bracket is provided with a through receiving groove along the axial direction of the rotor. The PCB board is arranged on the mounting bracket. The photoelectric sensor is arranged on the PCB board and received in the receiving groove. The detection end of the photoelectric sensor faces the detection area.

2. The rotor speed and position detection assembly according to claim 1, characterized in that: The detection area includes six light reflection detection blocks and six light extinction detection blocks, and the light reflection detection blocks and the light extinction detection blocks are alternately arranged along the circumferential direction of the rotor.

3. The rotor speed and position detection assembly according to claim 1, characterized in that: The reflective detection block is a high-reflective paint coating sprayed on the end surface of the rotor, and the extinction detection block is an extinction paint coating sprayed on the end surface of the rotor.

4. The rotor speed and position detection assembly according to claim 1, characterized in that: The reflective detection block is a sticker coated with a reflective material, and the extinction detection block is a sticker coated with an extinction material.

5. The rotor speed and position detection assembly according to claim 1, characterized in that: The adjacent reflection detection blocks and extinction detection blocks are arranged at intervals of 30° along the circumferential direction.

6. The rotor speed and position detection assembly according to claim 1, characterized in that: The mounting bracket is provided with a first fixing hole.

7. The rotor speed and position detection assembly according to claim 1, characterized in that: The PCB board is provided with a second fixing hole, the mounting bracket is provided with a threaded fixing hole, and the second fixing hole is coaxially corresponding to the threaded fixing hole.

8. The rotor speed and position detection assembly according to claim 1, characterized in that: The photoelectric sensors are provided in plurality, and the plurality of photoelectric sensors are respectively arranged on the PCB board and spaced apart along the circumferential direction. The mounting bracket is provided with a plurality of accommodating grooves at intervals, and the accommodating grooves correspond to the photoelectric sensors one by one.

9. The rotor speed and position detection assembly according to claim 8, characterized in that: Two adjacent photoelectric sensors are spaced 20 degrees apart.

10. A generator, characterized in that include: shell; a stator shaft, disposed in the housing; as well as According to the rotor speed and position detection assembly as described in any one of claims 1 to 9, the rotor is coaxially arranged on the outer periphery of the stator shaft, and the mounting bracket is arranged on the stator shaft.

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