Photoelectric encoder

Abstract

The utility model provides a photoelectric encoder, in which an encoding disc comprises a rotor positioning code channel, the rotor positioning code channel comprises a plurality of sub-code channels, the plurality of sub-code channels are uniformly arranged along the circumferential direction of the encoding disc, and the encoding modes of the plurality of sub-code channels are different. Therefore, the number of code channels can be reduced, the structure of the coding disc is more concise, and the realization of miniaturization design is facilitated. Meanwhile, the plurality of sub-code channels are uniformly arranged along the circumferential direction of the coding disc, and the position of the rotor can be positioned and measured from a plurality of angles by adopting different coding modes, so that the measurement precision is improved. And meanwhile, the uniformly arranged sub-code channels can enable the measurement result to be more stable and reliable, and the situation of inaccurate measurement caused by the fault or error of a single code channel is reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of encoders, and specifically relates to a photoelectric encoder. Background Art

[0002] Photoelectric encoders, sensors that convert rotating mechanical quantities on an output shaft into pulses or digital values ​​through photoelectric conversion, are currently mostly multi-channel encoders. While they offer high measurement accuracy, they suffer from drawbacks such as excessive number of encoder tracks and complex structures, making them difficult to meet miniaturization requirements. Utility Model Content

[0003] Therefore, the technical problem to be solved by this application is to provide a photoelectric encoder that can reduce the number of code channels by merging several code channels with different encoding methods into the same code channel, making the structure of the encoding disk more concise and conducive to miniaturization design.

[0004] In order to solve the above problems, the present application provides a photoelectric encoder, comprising:

[0005] An encoding disk, the encoding disk is coaxially arranged and relatively fixed to the output shaft of the motor to be tested;

[0006] A light-emitting component, located on one side of the encoding disc and configured to provide illumination;

[0007] a light receiving component, the light receiving component being located on a side of the encoding disk away from the light emitting component and being used to receive light passing through the encoding disk;

[0008] The encoding disc comprises:

[0009] A rotor positioning code track, wherein the rotor positioning code track includes a plurality of sub-code tracks, and the plurality of sub-code tracks are evenly arranged along the circumferential direction of the encoding disk;

[0010] Among them, the encoding methods of the plurality of sub-code channels are different.

[0011] Optionally, each of the sub-code channels is evenly distributed with light and dark stripes of the same width, and the light and dark stripes of several of the sub-code channels have different widths.

[0012] Optionally, the difference in the number of light and dark stripes between two adjacent sub-code channels is greater than 1.

[0013] Optionally, the encoding disc further includes:

[0014] A dual-function code channel is concentrically arranged with the rotor positioning code channel, and light and dark stripes in the dual-function code channel are evenly distributed.

[0015] Optionally, the diameter of the dual-function code channel is larger than the diameter of the rotor positioning code channel.

[0016] Optionally, the light-emitting component and the light-receiving component are arranged on the same detection element, the detection element is a horizontal U-shaped structure, and the detection element is electrically connected to the mainboard.

[0017] Optionally, the light receiving component includes a first receiving unit, and the orthographic projection of the first receiving unit on the encoding disk is located at a position halfway along the extension direction of the light and dark stripes of the rotor positioning code channel.

[0018] Optionally, when the encoding disk includes a dual-function code channel, the light receiving component also includes at least two second receiving units arranged at intervals, and the orthographic projections of at least two second receiving units on the encoding disk are both located at half the position in the extension direction of the light and dark stripes of the dual-function code channel.

[0019] Optionally, with the center of the encoding disk as the center of the circle, a central angle of at least two of the second receiving units is smaller than 180 degrees.

[0020] Beneficial effects

[0021] Embodiments of the present invention provide a photoelectric encoder in which an encoder disk combines several code tracks with different encoding methods into a single code track, thereby reducing the number of code tracks and simplifying the encoder disk structure, thereby facilitating a miniaturized design. Furthermore, several sub-code tracks are evenly arranged along the circumference of the encoder disk, and different encoding methods are used to locate and measure the rotor position from multiple angles, thereby improving measurement accuracy. Furthermore, the evenly arranged sub-code tracks make measurement results more stable and reliable, reducing measurement inaccuracies caused by single-code track failures or errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of an encoding disk according to an optional embodiment of the present application;

[0023] Figure 2 This is a schematic structural diagram of a photoelectric encoder according to an optional embodiment of the present application;

[0024] Figure 3 A top view of a detection element and a main board according to an optional embodiment of the present application;

[0025] Figure 4 This is a cross-sectional view of a detection element according to an optional embodiment of the present application.

[0026] The reference numerals indicate:

[0027] 1, encoding disc; 11, rotor positioning code channel; 111, sub code channel; 12, dual-function code channel; 2, light-emitting assembly; 3, light-receiving assembly; 31, first receiving unit; 32, second receiving unit; 4, detection element; 5, mainboard; 6, motor to be detected. DETAILED DESCRIPTION

[0028] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0029] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0030] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] The preferred embodiments of the present application will be described below with reference to the accompanying drawings, and it should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0032] Referring to Figure 1 The embodiment of the first aspect of the present application provides an encoding disc 1, which comprises: a rotor positioning code channel 11, the rotor positioning code channel 11 comprises a plurality of sub code channels 111, the plurality of sub code channels 111 are uniformly arranged along the circumferential direction of the encoding disc 1; wherein the encoding modes of the plurality of sub code channels 111 are different.

[0033] It should be noted that the code disc 1 can reduce the number of code channels by combining several code channels with different encoding methods in the same code channel, so that the structure of the code disc 1 is more simple, which is beneficial to realize miniaturization design. At the same time, the several sub-code channels 111 are uniformly arranged along the circumferential direction of the code disc 1, and the different encoding methods can position and measure the position of the rotor from multiple angles, thereby improving the measurement accuracy. At the same time, the uniformly arranged sub-code channels 111 can make the measurement result more stable and reliable, and reduce the inaccurate measurement caused by single code channel failure or error.

[0034] The code disc 1 can be applied to an encoder. The encoder is a device for measuring rotary motion or linear displacement, and its working principle is to read the specific encoding information on the code disc 1 to determine the position, speed and other parameters of the rotor.

[0035] Specifically, the code disc 1 has a rotor positioning code channel 11, which is composed of several sub-code channels 111 arranged uniformly along the circumferential direction of the code disc 1 and having different encoding methods. It can realize that only one light receiving area or one photoelectric switch on the chip of the encoder can complete the output of several states, which on the one hand reduces the complexity of chip design and saves cost, and on the other hand saves space above the code disc 1, which is beneficial to the development of the encoder towards miniaturization.

[0036] The rotor positioning code channel 11 can be a ring structure, so that each sub-code channel 111 can interact with the reading device of the encoder in turn during the rotation of the rotor, ensuring continuous collection of position information. At the same time, the ring-shaped rotor positioning code channel 11 can realize full coverage, no matter what angle the rotor is at, there will be corresponding sub-code channels 111 participating in positioning and measurement, which further improves the accuracy and reliability of measurement. Further, the ring-shaped rotor positioning code channel 11 also has good stability. Because of its circular shape, the relative positional relationship between each sub-code channel 111 is not easy to change when subjected to external vibration or impact, thereby ensuring the stability of the encoding information. This is particularly important for encoders in harsh working environments, as it can effectively reduce measurement errors caused by external interference. In addition, the ring-shaped rotor positioning code channel 11 is also convenient for integration with other components of the encoder. Its regular shape can better adapt to the overall structural design of the encoder, making the assembly of the encoder more convenient and efficient. At the same time, the ring structure also provides convenience for subsequent maintenance and upgrading, and technicians can more conveniently check and adjust the rotor positioning code channel 11.

[0037] Specifically, each sub-code channel 111 has a different encoding method from each other, so that the encoder reading device can obtain different encoding information during the rotation of the rotor, thereby determining the rotor's position, speed and other parameters. In some specific examples, several sub-code channels 111 can be encoded with different colors, such as red representing a specific encoding meaning and blue representing another encoding meaning. Different encoding information output is achieved by reading sub-code channels 111 of different colors through a color sensor. In other specific examples, the shapes of the sub-code channels 111 can be different. For example, some sub-code channels 111 are circular patterns, representing one encoding; some sub-code channels 111 are triangular patterns, representing another encoding. Different encoding information is distinguished by identifying patterns of different shapes.

[0038] The rotor may be the output shaft of the motor 6 to be tested.

[0039] Specifically, the rotor positioning code track 11 can include six sub-code tracks 111 to achieve six output states. This allows an encoder with the above-described encoder disk 1, when used in a brushless motor, to accurately provide feedback on the position information of the motor's output shaft, ensuring efficient and stable operation of the brushless motor. It will be understood that when the rotor positioning code track 11 includes six sub-code tracks 111, the central angle corresponding to each sub-code track 111 is 60 degrees.

[0040] In some possible implementations disclosed in this application, see Figure 1 As shown, each sub-code channel 111 is evenly distributed with light and dark stripes of the same width, and the light and dark stripes of several sub-code channels 111 have different widths.

[0041] It should be noted that light and dark stripes of varying widths can provide more detailed position information. Because the light and dark stripes of each sub-channel 111 have varying widths, the rotor's position can be more accurately determined from multiple dimensions during measurement. For example, when light passes through the light and dark stripes of different sub-channels 111, the resulting optical signal exhibits richer variations, thereby improving measurement resolution and accuracy. Furthermore, when external interference factors, such as light intensity fluctuations or dust, exist, light and dark stripes of varying widths can reduce the impact of interference on measurement results. Because the encoding characteristics of different sub-channels 111 vary, even if one sub-channel 111 experiences a certain degree of interference, other sub-channels 111 can still provide relatively accurate position information. By integrating information from multiple sub-channels 111, the system's anti-interference capability can be effectively improved. Furthermore, if a sub-channel 111 experiences a fault, the problem can be quickly located by comparing the light and dark stripe characteristics of different sub-channels 111. Since the light and dark stripes of each sub-code channel 111 have different widths, once an abnormality occurs, it is easier to identify the faulty sub-code channel 111, thereby facilitating fault diagnosis and maintenance and improving the reliability and availability of the encoder.

[0042] Among them, light and dark stripes can be made by high-precision laser engraving technology.

[0043] Specifically, in this embodiment, a single sub-channel 111 is evenly distributed with light and dark stripes. That is, the light and dark stripes appear at regular intervals throughout the entire area of ​​this sub-channel 111. Furthermore, the widths of these light and dark stripes are consistent within this specific sub-channel 111. For example, if the light stripe width of a sub-channel 111 is 1 mm, then all light stripes on this sub-channel 111 are 1 mm wide, and the dark stripes also maintain a consistent width, forming a repeating, regular pattern. However, the light and dark stripe widths vary from sub-channel 111 to sub-channel 111. In other words, there is no uniform standard for light and dark stripe widths across sub-channels 111. For example, the light stripe width of one sub-channel 111 may be 0.5 mm, while that of another sub-channel 111 may be 1.2 mm. This variation gives each sub-channel 111 a unique encoding signature. By identifying and interpreting the light and dark stripes of varying widths, specific information about the rotor position can be obtained.

[0044] In the above embodiment, see Figure 1 As shown, the difference in the number of light and dark stripes between two adjacent sub-code channels 111 is greater than 1.

[0045] It should be noted that the larger number difference of light and dark stripes between different sub-codetracks 111 can provide more rich position information levels. During the measurement process, by comparing the state of light and dark stripes on different sub-codetracks 111, the position of the rotor can be determined more accurately. For example, when the rotor is in a transition state between two positions, a larger number difference of light and dark stripes can make the measurement system more sensitive to small position changes, thereby improving resolution and accuracy. At the same time, the larger number difference of light and dark stripes makes the coding features of each sub-codetrack 111 more obvious, reducing the influence of external interference on the measurement results. Even in the presence of some degree of noise or interference, due to the large difference between different sub-codetracks 111, the system can still accurately identify the position of the rotor. For example, if a sub-codetrack 111 is temporarily disturbed and some light and dark stripes cannot be normally identified, the unique coding features of other sub-codetracks 111 can provide backup position information to ensure the reliability of the measurement. At the same time, when the encoder disc 1 fails, a larger number difference of light and dark stripes helps to quickly locate the problem. If a sub-codetrack 111 fails, the obvious difference in the number of light and dark stripes between it and the adjacent sub-codetrack 111 can be used as a basis for fault diagnosis. At the same time, in some cases, even if a sub-codetrack 111 completely fails, the system can still rely on the information of other sub-codetracks 111 for approximate position measurement, improving the fault tolerance of the system.

[0046] Wherein, when there are 10 light and dark stripes on a sub-codetrack 111, the number of light and dark stripes on the adjacent sub-codetrack 111 can be 7 or less, or 13 or more, as long as the difference in the number of light and dark stripes between the two adjacent sub-codetracks 111 is greater than 1, and the present embodiment does not make further limitations.

[0047] In some possible implemented embodiments disclosed in the present application, referring to FIG. 1, Figure 1 It should be noted that by setting the dual-function sub-codetrack 12 concentric with the rotor positioning sub-codetrack 11, the function of the encoder disc 1 is increased without significantly increasing the overall space occupation of the encoder disc 1. More measurement and positioning tasks can be achieved on the same encoder disc 1, improving the integration of the encoder disc 1, reducing the need for multiple independent encoding elements, and reducing the complexity and cost of the system.

[0048] It should be noted that by setting the dual-function sub-codetrack 12 concentric with the rotor positioning sub-codetrack 11, the function of the encoder disc 1 is increased without significantly increasing the overall space occupation of the encoder disc 1. More measurement and positioning tasks can be achieved on the same encoder disc 1, improving the integration of the encoder disc 1, reducing the need for multiple independent encoding elements, and reducing the complexity and cost of the system.

[0049] Wherein, the rotor positioning sub-codetrack 11 can be used only to determine the position of the rotor, and the rotation direction and rotation speed of the rotor can be determined by the dual-function sub-codetrack 12.

[0050] Specifically, the evenly distributed light and dark stripes of the dual-function code channel 12 can be accurately identified using a specialized reading device. As the rotor rotates, the changes in the light and dark stripes on the dual-function code channel 12 are converted into electrical signals, which, after processing, can be used to determine the rotor's rotational direction and speed. For example, by analyzing the changes in the light and dark stripes of the dual-function code channel 12 at two consecutive time points, it is possible to determine whether the rotor is rotating clockwise or counterclockwise. Furthermore, the rotor's rotational speed can be calculated based on the number of light and dark stripe changes within a given period of time.

[0051] In the above embodiment, see Figure 1 As shown, the diameter of the dual-function code track 12 is larger than the diameter of the rotor positioning code track 11 .

[0052] It should be noted that the larger diameter of the dual-function code channel 12 means a longer circumference, resulting in a relatively greater number of light and dark fringes distributed across it. This provides richer information when measuring the rotor's rotational direction and speed, thereby improving measurement accuracy. Furthermore, the longer circumference results in more subtle variations in the light and dark fringes per unit angle change, enabling a more accurate reflection of the rotor's motion and enhancing measurement stability.

[0053] When the diameter of the dual-function code track 12 is greater than the diameter of the rotor positioning code track 11 , the dual-function code track 12 is located on the outer circumference of the rotor positioning code track 11 .

[0054] For an embodiment of the second aspect of this application, see Figures 2 to 4 As shown, a photoelectric encoder is provided, comprising: an encoding disk 1 as described above, the encoding disk 1 being coaxially arranged with the output shaft of the motor 6 to be measured and relatively fixed; a light-emitting component 2, the light-emitting component 2 being located on one side of the encoding disk 1 and being used to provide illumination; and a light-receiving component 3, the light-receiving component 3 being located on the side of the encoding disk 1 away from the light-emitting component 2 and being used to receive light passing through the encoding disk 1.

[0055] It should be noted that the cooperation between the light-emitting component 2 and the light-receiving component 3 ensures that light accurately passes through the encoding disk 1 and is received by the light-receiving component 3. By analyzing the received light, the position information of the encoding disk 1 can be accurately determined, thereby indirectly determining the position of the output shaft of the motor 6 to be measured, thereby improving the accuracy of the measurement.

[0056] In this embodiment, the motor to be tested 6 is a brushless motor, and the output shaft of the motor to be tested 6 is specifically the output shaft of the brushless motor.

[0057] Specifically, in practical applications, the encoder disk 1 can be mounted on the output shaft of a brushless motor. The rotor positioning code track 11 of the encoder disk 1 has six sub-code tracks 111. A light-emitting component 2 is provided on one side of the encoder disk 1 at a position relative to the rotor positioning code track 11. The light-emitting component 2 is used to provide light that can effectively penetrate the encoder disk 1, thereby enabling the light-receiving component 3 to receive the clearest coded information. The light-receiving component 3, which is provided on the side of the encoder disk 1 facing away from the light-emitting component 2 and at a position relative to the rotor positioning code track 11, is used to receive the light that has passed through the encoder disk 1. When the light emitted by the light-emitting component 2 passes through the encoder disk 1, various features on the encoder disk 1, such as light and dark stripes and different code tracks, modulate the light. The light-receiving component 3 detects this modulated light and converts it into an electrical signal or other processable signal form. Then, by analyzing and processing these signals, parameters such as the position and speed of the output shaft of the brushless motor can be determined.

[0058] In some possible implementations disclosed in this application, see Figure 3 As shown, the light emitting component 2 and the light receiving component 3 are arranged on the same detection element 4 . The detection element 4 is a horizontal U-shaped structure. The detection element 4 is electrically connected to the mainboard 5 .

[0059] It should be noted that placing the light-emitting component 2 and the light-receiving component 3 on the same detection element 4 greatly saves space and makes the entire photoelectric encoder structure more compact. This is conducive to miniaturization of the encoder, making it suitable for space-constrained applications such as small motors and precision instruments.

[0060] The detection element 4 is a horizontal U-shaped structure, that is, the detection element 4 is roughly a horizontal letter "U".

[0061] Specifically, when the detection element 4 integrates the light-emitting component 2 and the light-receiving component 3, the detection element 4 is used to provide mechanical support and electrical connection for the light-emitting component 2 and the light-receiving component 3. The light-emitting component 2 may include a light source device such as a light-emitting diode (LED), which obtains power through the circuit connection on the mainboard 5 and emits light of a specific wavelength and intensity. The light-receiving component 3 may include a photosensitive device such as a photodiode or a photoresistor, and similarly transmits and processes signals with other components through the circuit on the mainboard 5.

[0062] The light-emitting component 2 and the light-receiving component 3 are located within the opening of the transverse U-shaped detection element 4. The transverse U-shaped detection element 4 can, to a certain extent, shield the light-emitting component 2 and the light-receiving component 3 from external interference. This reduces the effects of external electromagnetic interference, light interference, and other external interference on the light-emitting component 2 and the light-receiving component 3, thereby improving the anti-interference capability of the photoelectric encoder.

[0063] Specifically, in actual applications, the output shaft of the motor under test 6 rotates the encoder disk 1. At least part of the rotational path of the rotor positioning code channel 11 and the dual-function code channel 12 on the encoder disk 1 is located within the opening of the horizontal U-shaped detection element 4, so that the light-emitting component 2 within the opening of the detection element 4 continuously and stably emits light toward the encoder disk 1. This light passes through the different sub-code channels 111 and dual-function code channels 12 on the encoder disk 1. Due to the unique coding characteristics of each code channel, the light is modulated into a specific pattern. The light-receiving component 3 keenly captures this modulated light, converts it into an electrical signal, and transmits it to the subsequent signal processing circuit.

[0064] The mainboard 5 may be a printed circuit board (PCB) made of insulating material.

[0065] In some possible implementations disclosed in this application, see Figure 3 and Figure 4 As shown, the light receiving component 3 includes a first receiving unit 31 , and the orthographic projection of the first receiving unit 31 on the encoding disc 1 is located at a position halfway along the extension direction of the light and dark stripes of the rotor positioning code track 11 .

[0066] It should be noted that if the encoder disk 1 rotates unsteadily, the position and angle of light passing through the light and dark stripes will constantly change. Positioning the first receiving unit 31 at a position halfway along the extension direction of the light and dark stripes ensures that the first receiving unit 31 can always receive light that has passed through the rotor positioning track 11. Even if the unstable rotation of the encoder disk 1 causes significant changes in the incident angle and position of light, the first receiving unit 31 can still capture a relatively stable light signal, thereby improving signal stability.

[0067] In some possible implementations disclosed in this application, see Figure 3 and Figure 4 As shown, when the encoding disk 1 includes a dual-function code channel 12, the light receiving component 3 also includes at least two second receiving units 32 arranged at intervals, and the positive projections of the at least two second receiving units 32 on the encoding disk 1 are both located at half the position in the extension direction of the light and dark stripes of the dual-function code channel 12.

[0068] It should be noted that for determining the direction of rotation, at least two spaced-apart second receiving units 32 can receive information about the light and dark stripes changing in the dual-function code channel 12 from different locations. By comparing the sequence of signal changes received by different second receiving units 32, the rotor's rotation direction can be more accurately determined. For example, when the rotor rotates clockwise, the time sequence of the light and dark stripe changes received by second receiving units 32 at different locations will be different from that when the rotor rotates counterclockwise, thereby improving the accuracy of determining the direction of rotation. For measuring rotational speed, at least two spaced-apart second receiving units 32 can receive information about light and dark stripes at different locations simultaneously. Based on the difference in the frequency of light and dark stripe changes at different locations, the rotor's rotational speed can be more accurately calculated. For example, by analyzing the time difference between the light and dark stripe changes received by two second receiving units 32 at a predetermined distance, the rotor's rotation angle during this period can be calculated, thereby more accurately deriving the rotational speed.

[0069] Furthermore, if the encoder disk 1 rotates unsteadily, the position and angle of light passing through the light and dark stripes will constantly change. However, positioning the at least two second receiving units 32 at a position halfway along the extension direction of the light and dark stripes ensures that the at least two second receiving units 32 can always receive light that has passed through the dual-function code channel 12. Even if the unstable rotation of the encoder disk 1 causes significant changes in the incident angle and position of the light, the at least two second receiving units 32 can still capture a relatively stable light signal, thereby improving signal stability.

[0070] In the above embodiment, with the center of the encoder disk 1 as the center of the circle, the center angle of at least two second receiving units 32 is smaller than 180 degrees.

[0071] It should be noted that when the central angle of the at least two second receiving units 32 is less than 180 degrees, the spatial distribution of the at least two second receiving units 32 is more concentrated, eliminating the need for excessive expansion of the mainboard 4 to accommodate the at least two second receiving units 32 distributed at a larger angle, thereby facilitating a miniaturized design of the mainboard 4. Furthermore, the changing details of the light and dark stripes on the dual-function code channel 12 can be more accurately captured, improving the accuracy of measuring the rotor's rotation direction and speed.

[0072] In this embodiment, two second receiving units 32 are provided.

[0073] Specifically, the central angle of the two second receiving units 32 is less than 180 degrees. It can be understood that when observing from the center of the encoder disk 1 to the periphery, the angle formed by the two second receiving units 32 and the center line is less than 180 degrees.

[0074] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0075] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application. The above are merely preferred embodiments of the present application. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present application, and such improvements and variations shall also be considered within the scope of protection of the present application.

Claims

1. A photoelectric encoder, characterized in that: include: An encoding disc (1), the encoding disc (1) and an output shaft of a motor to be tested (6) are coaxially arranged and relatively fixed; a light-emitting component (2), the light-emitting component (2) being located on one side of the encoding disc (1) and being used for providing illumination; a light receiving component (3), the light receiving component (3) being located on a side of the encoding disk (1) away from the light emitting component (2) and being used for receiving light transmitted through the encoding disk (1); The encoding disc (1) comprises: A rotor positioning code track (11), wherein the rotor positioning code track (11) includes a plurality of sub-code tracks (111), and the plurality of sub-code tracks (111) are evenly arranged along the circumferential direction of the encoding disc (1); Among them, the encoding methods of several sub-code channels (111) are different.

2. The photoelectric encoder according to claim 1, wherein Each sub-code channel (111) is evenly distributed with light and dark stripes of the same width, and the light and dark stripes of several sub-code channels (111) have different widths.

3. The photoelectric encoder according to claim 2, characterized in that The difference in the number of light and dark stripes between two adjacent sub-code channels (111) is greater than 1.

4. The photoelectric encoder according to claim 1, wherein: The encoding disc (1) further comprises: A dual-function code channel (12) is provided concentrically with the rotor positioning code channel (11), and light and dark stripes in the dual-function code channel (12) are evenly distributed.

5. The photoelectric encoder according to claim 4, characterized in that The diameter of the dual-function code channel (12) is greater than the diameter of the rotor positioning code channel (11).

6. The photoelectric encoder according to claim 1, wherein: The light-emitting component (2) and the light-receiving component (3) are arranged on the same detection element (4); the detection element (4) is a horizontal U-shaped structure; and the detection element (4) is electrically connected to a mainboard (5).

7. The photoelectric encoder according to claim 1, wherein: The light receiving component (3) comprises a first receiving unit (31), wherein the orthographic projection of the first receiving unit (31) on the encoding disc (1) is located at a position halfway along the extension direction of the light and dark stripes of the rotor positioning code track (11).

8. The photoelectric encoder according to claim 1, wherein: When the encoding disk (1) includes a dual-function code channel (12), the light receiving component (3) further includes at least two second receiving units (32) arranged at intervals, and the orthographic projections of the at least two second receiving units (32) on the encoding disk (1) are both located at a position halfway along the extension direction of the light and dark stripes of the dual-function code channel (12).

9. The photoelectric encoder according to claim 8, characterized in that: With the center of the encoding disc (1) as the center of the circle, the center angle of at least two of the second receiving units (32) is less than 180 degrees.

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