Annular magnetic encoder assembly and motor

Abstract

The utility model discloses a ring-shaped magnetic encoder assembly and a motor. The ring-shaped magnetic encoder assembly comprises a motor rotating shaft; the magnetic head assembly is arranged on the motor rotating shaft and comprises a first multi-pole magnetic head and a second multi-pole magnetic head; the circuit board assembly comprises a first circuit board and a first magneto-sensitive element, the first magneto-sensitive element is arranged on the first circuit board and corresponds to the second multi-pole magnetic head, and the motor rotating shaft penetrates through the first circuit board; when the motor rotating shaft drives the second multi-pole magnetic head to rotate, the second multi-pole magnetic head synchronously rotates to generate magnetic field change, and the first magnetic sensitive element is used for sensing the magnetic field change of the second multi-pole magnetic head and generating a first electric signal. Through the design that the motor rotating shaft penetrates through the first circuit board, the annular magnetic encoder assembly can be installed at any position of the motor rotating shaft, including a non-tail-shaft position, so that the occupied space of the annular magnetic encoder assembly is reduced, and the annular magnetic encoder assembly adapts to application in a compact space.

Description

Technical Field

[0001] This application relates to the field of motor technology, and particularly to an annular magnetic encoder assembly and a motor. Background Art

[0002] An encoder is a key component in the field of motors. It can convert the motion of a motor into an electrical signal to achieve precise control. In a motor system, the encoder provides necessary feedback signals for monitoring and controlling the position, speed, and direction of the motor. Encoder types include optical encoders and magnetic encoders, etc.

[0003] A magnetic encoder is a new type of angle or displacement measuring device. Its principle is to use magnetoresistive elements or Hall elements to measure the angle or displacement value of a changing magnetic material. Traditional magnetic encoders are mostly installed at the end of the motor shaft, but this method increases the occupied space of the magnetic encoder and limits its application in a compact space. Summary of the Utility Model

[0004] This application mainly provides an annular magnetic encoder assembly and a motor to solve the problem of the occupied space of the magnetic encoder.

[0005] This application provides an annular magnetic encoder assembly, including:

[0006] A motor shaft;

[0007] A magnetic head assembly disposed on the motor shaft. The magnetic head assembly includes a first multi-pole magnetic head and a second multi-pole magnetic head. The first multi-pole magnetic head is disposed on the side of the magnetic head assembly close to the motor shaft, and the second multi-pole magnetic head is disposed on the side of the magnetic head assembly away from the motor shaft;

[0008] A circuit board assembly including a first circuit board and a first magnetic sensor element. The first magnetic sensor element is disposed on the first circuit board and is correspondingly disposed with the second multi-pole magnetic head. The motor shaft passes through the first circuit board;

[0009] When the motor shaft drives the first multi-pole magnetic head and the second multi-pole magnetic head to rotate, the second multi-pole magnetic head rotates synchronously to generate a magnetic field change. The first magnetic sensor element is used to sense the magnetic field change of the second multi-pole magnetic head and generate a first electrical signal.

[0010] Wherein, the circuit board assembly further includes a second circuit board and a second magnetic sensor element. The second magnetic sensor element is disposed on the second circuit board and is correspondingly disposed with the first multi-pole magnetic head. The first multi-pole magnetic head rotates synchronously to generate a magnetic field change. The second magnetic sensor element is used to sense the magnetic field change of the first multi-pole magnetic head and generate a second electrical signal.

[0011] Wherein, the circuit board assembly further includes a circuit board bracket, the circuit board bracket is disposed on the first circuit board, the second circuit board is disposed on the circuit board bracket, and the circuit board bracket is used to fix the first circuit board and the second circuit board.

[0012] Wherein, the magnetic head assembly further includes a magnetic head bracket, the magnetic head bracket is mounted on the motor rotating shaft, the motor rotating shaft sequentially passes through the magnetic head bracket and the first circuit board, the first multi-pole magnetic head is disposed on a side of the magnetic head bracket away from the first circuit board and is correspondingly disposed with the second magnetic sensitive element; the second multi-pole magnetic head is disposed on a side of the magnetic head bracket close to the first circuit board and is correspondingly disposed with the first magnetic sensitive element.

[0013] Wherein, the first multi-pole magnetic head includes m N poles and m S poles, the m N poles and the m S poles are alternately arranged and surrounded in a circular shape, and the motor rotating shaft is located at the center of the first multi-pole magnetic head.

[0014] Wherein, the second multi-pole magnetic head includes n N poles and n S poles, the n N poles and the n S poles are alternately arranged and surrounded in a circular shape, and the motor rotating shaft is located at the center of the second multi-pole magnetic head.

[0015] Wherein, both m and n are relatively prime integers.

[0016] Wherein, the first circuit board is used to obtain the single-turn relative position of the motor according to the first electrical signal.

[0017] Wherein, the second circuit board is used to obtain the relative position of the motor according to the second electrical signal.

[0018] This application also provides a motor, including the above-mentioned annular magnetic encoder assembly.

[0019] The beneficial effects of this application are as follows: In the annular magnetic encoder assembly of this application, the magnetic head assembly is disposed on the motor rotating shaft, and the motor rotating shaft passes through the first circuit board; when the second multi-pole magnetic head of the magnetic head assembly is driven by the motor rotating shaft to rotate, the second multi-pole magnetic head generates a magnetic field change, and the first magnetic sensitive element on the first circuit board senses the magnetic field change of the second multi-pole magnetic head and generates a first electrical signal. Through the design that the motor rotating shaft passes through the first circuit board, the annular magnetic encoder assembly can be installed at any position of the motor rotating shaft, including non-tail shaft positions, reducing the occupied space of the annular magnetic encoder assembly, and thus enabling the annular magnetic encoder assembly to adapt to applications in compact spaces. Description of the Drawings

[0020] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings. Among them:

[0021] Figure 1 is a cross-sectional schematic diagram of an embodiment of a circular magnetic encoder assembly provided by the present application;

[0022] Figure 2 is Figure 1 a schematic structural diagram of an embodiment of the first multi-pole magnetic head in

[0023] Figure 3 is Figure 1 a schematic structural diagram of an embodiment of the second multi-pole magnetic head in Specific Embodiments

[0024] The following will describe in detail the embodiments of the technical solutions of the present application with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, so they are only examples and cannot be used to limit the protection scope of the present application.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above accompanying drawing descriptions are intended to cover non-exclusive inclusion.

[0026] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features.

[0027] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0028] In the description of the embodiments of the present application, the term "and / or" is merely an association relationship describing associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0029] In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0030] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the embodiments of the present application.

[0031] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0032] A magnetic encoder is a new type of angle or displacement measuring device. Its principle is to use magnetoresistive elements or Hall elements to measure the angle or displacement value of a changing magnetic material. The change in the angle or displacement of the magnetic material will cause a certain change in resistance or voltage. The change amount is amplified by an amplifier circuit and output as a pulse signal or an analog signal after being processed by a single-chip microcomputer to achieve the purpose of measurement.

[0033] The role of the magnetic encoder in the motor system is to feedback the speed, position, and angle information of the motor rotor to the driver. The driver calculates and adjusts according to the information feedback by the magnetic encoder and outputs corresponding control measures to adjust the motor to the corresponding operating mode, forming a closed-loop control.

[0034] Traditional magnetic encoders are mostly installed at the end of the motor shaft. However, this method limits the application of magnetic encoders in compact spaces and the cost of magnetic encoders is relatively high.

[0035] This application provides an annular magnetic encoder assembly. Please refer to Figures 1 - 3 as shown in Figure 1 Fig. 1, which is a cross-sectional schematic view of an embodiment of an annular magnetic encoder assembly provided by this application. Figure 2 Fig. 2 Figure 1 is a schematic structural view of an embodiment of the first multi-pole magnetic head in Figure 3 Fig. 2, Figure 1 and Fig. 3 is a schematic structural view of an embodiment of the second multi-pole magnetic head in Fig. 2. The annular magnetic encoder assembly 1 of this embodiment includes a motor shaft 10, a magnetic head assembly 20, and a circuit board assembly 30.

[0036] Among them, the motor shaft 10 refers to the rotating shaft in the motor for connecting the load and outputting power, and is usually composed of components such as the rotor and bearing of the motor.

[0037] The magnetic head assembly 20 is disposed on the motor shaft 10. The magnetic head assembly 20 includes a first multi-pole magnetic head 21 and a second multi-pole magnetic head 22. The first multi-pole magnetic head 21 is disposed on one side of the magnetic head assembly 20 close to the motor shaft 10, and the second multi-pole magnetic head 22 is disposed on the side of the magnetic head assembly 20 far from the motor shaft 10.

[0038] The magnetic head assembly 20 refers to the component in the annular magnetic encoder assembly 1 for generating magnetic field changes. Among them, the magnetic head is a physical element for generating a magnetic field, usually made of a material with high magnetic permeability to ensure the effective generation and propagation of the magnetic field. The multi-pole magnetic head is a magnetic head with multiple magnetic poles and can generate multiple magnetic fields with different phases.

[0039] Optionally, the magnetic poles of the first multi-pole magnetic head 21 and the second multi-pole magnetic head 22 in this embodiment are different. In other embodiments, the magnetic poles of the first multi-pole magnetic head 21 can be the same as those of the second multi-pole magnetic head 22.

[0040] In this embodiment, one end of the motor shaft 10 passes through the magnetic head assembly 20, and the magnetic head assembly 20 is disposed on the motor shaft 10. The first multi-pole magnetic head 21 is disposed on one side of the magnetic head assembly 20 close to the other end of the motor shaft 10, and the second multi-pole magnetic head 22 is disposed on the side of the magnetic head assembly 20 far from the other end of the motor shaft 10.

[0041] Among them, the magnetic head assembly 20 is usually installed on the motor shaft 10 through a keyway or a coupling to ensure the synchronization of the output of the magnetic head assembly 20 with the rotation of the motor shaft 10.

[0042] The circuit board assembly 30 includes a first circuit board 31 and a first magnetic sensor element 32. The first magnetic sensor element 32 is disposed on the first circuit board 31 and is correspondingly arranged with the second multi-pole magnetic head 22. The motor rotating shaft 10 passes through the first circuit board 31.

[0043] For example, the first magnetic sensor element 32 and the second multi-pole magnetic head 22 are correspondingly arranged in the axial direction of the motor rotating shaft 10.

[0044] The circuit board assembly 30 refers to the component in the annular magnetic encoder assembly 1 for sensing magnetic field changes. The magnetic sensor element refers to an element that can sense magnetic field changes and convert them into electrical signals. Common magnetic sensor elements include Hall elements and magnetoresistive elements.

[0045] The circuit board is also called a Printed Circuit Board (PCB), which is a support for connecting electronic components and circuits together.

[0046] In this embodiment, the first magnetic sensor element 32 is disposed on the first circuit board 31. The first circuit board 31 is used to connect the first magnetic sensor element 32 to the circuit on the first circuit board 31 and is used to process the electrical signal generated by the first magnetic sensor element 32.

[0047] Optionally, the first magnetic sensor element 32 and the second multi-pole magnetic head 22 are correspondingly arranged in the axial direction of the motor rotating shaft 10. In other embodiments, the first magnetic sensor element 32 and the second multi-pole magnetic head 22 are correspondingly arranged in the radial direction of the motor rotating shaft 10.

[0048] Specifically, a through hole is provided on the first circuit board 31. The diameter of the through hole is larger than the diameter of the motor rotating shaft 10. The motor rotating shaft 10 passes through the first circuit board 31 through this through hole. When the motor rotating shaft 10 rotates, the first circuit board 31 does not move.

[0049] When the motor rotating shaft 10 drives the first multi-pole magnetic head 21 and the second multi-pole magnetic head 22 to rotate, the second multi-pole magnetic head 22 rotates synchronously to generate magnetic field changes. The first magnetic sensor element 32 is used to sense the magnetic field changes of the second multi-pole magnetic head 22 and generate a first electrical signal.

[0050] The first electrical signal refers to the electrical signal correspondingly generated when the first magnetic sensor element 32 senses the magnetic field changes of the second multi-pole magnetic head 22.

[0051] Optionally, an induction gap is provided between the first magnetic sensor element 32 and the second multi-pole magnetic head 22 in this embodiment.

[0052] Among them, the induction gap refers to the physical space distance between the second multi-pole magnetic head 22 and the first magnetic sensor element 32, which is used for the first magnetic sensor element 32 to effectively sense the magnetic field changes of the second multi-pole magnetic head 22.

[0053] Through the reasonable size design of the annular magnetic encoder assembly 1, an effective induction gap is ensured between the first magnetic sensitive element 32 and the second multi-pole magnetic head 22, so that when the motor rotating shaft 10 rotates, the second multi-pole magnetic head 22 is driven to rotate, and the first magnetic sensitive element 32 can sense the magnetic field change of the second multi-pole magnetic head 22, thereby generating an effective first electrical signal.

[0054] Specifically, when the motor rotating shaft 10 drives the first multi-pole magnetic head 21 and the second multi-pole magnetic head 22 to rotate, the first multi-pole magnetic head 21 and the second multi-pole magnetic head 22 generate magnetic field changes during rotation; among them, the first magnetic sensitive element 32 correspondingly arranged with the second multi-pole magnetic head 22 can sense the magnetic field change generated by the second multi-pole magnetic head 22 and generate a first electrical signal. Further, the first circuit board 31 can process the first electrical signal generated by the first magnetic sensitive element 32.

[0055] In this embodiment, through the design that the motor rotating shaft 10 passes through the first circuit board 31, the annular magnetic encoder assembly 1 can be installed at any position of the motor rotating shaft 10, including non-tail shaft positions, reducing the occupied space of the annular magnetic encoder assembly 1, and thus enabling the annular magnetic encoder assembly 1 to adapt to applications in compact spaces.

[0056] According to some embodiments of the present application, the circuit board assembly 30 further includes a second circuit board 33 and a second magnetic sensitive element 34. The second magnetic sensitive element 34 is disposed on the second circuit board 33 and is correspondingly arranged with the first multi-pole magnetic head 21. The first multi-pole magnetic head 21 rotates synchronously to generate a magnetic field change, and the second magnetic sensitive element 34 is used to sense the magnetic field change of the first multi-pole magnetic head 21 and generate a second electrical signal.

[0057] The second magnetic sensitive element 34 is disposed on the second circuit board 33. The second circuit board 33 connects the second magnetic sensitive element 34 to the circuit on the second circuit board 33 and is used to process the electrical signal generated by the second magnetic sensitive element 34.

[0058] Optionally, the second magnetic sensitive element 34 and the first multi-pole magnetic head 21 are correspondingly arranged in the axial direction of the motor rotating shaft 10. In other embodiments, the second magnetic sensitive element 34 and the first multi-pole magnetic head 21 are correspondingly arranged in the radial direction of the motor rotating shaft 10.

[0059] When the motor rotating shaft 10 drives the first multi-pole magnetic head 21 to rotate, the first multi-pole magnetic head 21 rotates to generate a magnetic field change, and the second magnetic sensitive element 34 senses the magnetic field change of the first multi-pole magnetic head 21 and generates a second electrical signal.

[0060] The second electrical signal refers to the electrical signal correspondingly generated when the second magnetic sensitive element 34 senses the magnetic field change of the first multi-pole magnetic head 21.

[0061] Specifically, when the motor shaft 10 drives the first multi-pole magnetic head 21 and the second multi-pole magnetic head 22 to rotate, the first multi-pole magnetic head 21 and the second multi-pole magnetic head 22 generate magnetic field changes during rotation. Among them, the second magnetic sensitive element 34 correspondingly arranged with the first multi-pole magnetic head 21 can sense the magnetic field changes generated by the first multi-pole magnetic head 21 and generate a second electrical signal. Further, the second circuit board 33 can process the second electrical signal generated by the second magnetic sensitive element 34.

[0062] Optionally, in this embodiment, an induction gap is provided between the second magnetic sensitive element 34 and the first multi-pole magnetic head 21.

[0063] The induction gap refers to the physical space distance between the first multi-pole magnetic head 21 and the second magnetic sensitive element 34, which is used for the second magnetic sensitive element 34 to effectively sense the magnetic field changes of the second magnetic sensitive element 34.

[0064] Through the reasonable size design of the circular magnetic encoder assembly 1, an effective induction gap is ensured between the second magnetic sensitive element 34 and the first multi-pole magnetic head 21, so that when the motor shaft 10 rotates, it drives the first multi-pole magnetic head 21 to rotate, and the second magnetic sensitive element 34 can sense the magnetic field changes of the first multi-pole magnetic head 21, thereby generating an effective second electrical signal.

[0065] According to some embodiments of the present application, the circuit board assembly 30 further includes a circuit board bracket 35. The circuit board bracket 35 is arranged on the first circuit board 31, and the second circuit board 33 is arranged on the circuit board bracket 35. The circuit board bracket 35 is used to fix the first circuit board 31 and the second circuit board 33.

[0066] The circuit board bracket 35 refers to a component that fixes and supports the first circuit board 31 and the second circuit board 33. For example, the first circuit board 31 and the second circuit board 33 are respectively fixed at both ends of the circuit board bracket, as Figure 1 shown.

[0067] By fixing the first circuit board 31 and the second circuit board 33 on the circuit board bracket 35, that is, the second magnetic sensitive element 34 is fixed on the second circuit board 33, and the first magnetic sensitive element 32 is fixed on the first circuit board 31. When the motor shaft 10 drives the first multi-pole magnetic head 21 and the second multi-pole magnetic head 22 to rotate, the second magnetic sensitive element 34 can stably sense the magnetic field changes generated by the first multi-pole magnetic head 21, and the first magnetic sensitive element 32 can stably sense the magnetic field changes generated by the second multi-pole magnetic head 22.

[0068] According to some embodiments of the present application, the head assembly 20 further includes a head support 23, the head support 23 is mounted on the motor shaft 10, the motor shaft 10 sequentially passes through the head support 23 and the first circuit board 31, the first multi-pole head 21 is disposed on a side of the head support 23 away from the first circuit board 31 and is correspondingly disposed with the second magnetic sensitive element 34; the second multi-pole head 22 is disposed on a side of the head support 23 close to the first circuit board 31 and is correspondingly disposed with the first magnetic sensitive element 32.

[0069] The head support 23 refers to a component for fixing and supporting the first multi-pole head 21 and the second multi-pole head 22. In this embodiment, the head support 23 is composed of a high magnetic permeability material, which can effectively guide the magnetic field lines of the first multi-pole head 21 and the second multi-pole head 22 to pass through and reduce the magnetic resistance.

[0070] Specifically, the head support 23 is mounted on the motor shaft 10 through a keyway or a coupling, the motor shaft 10 sequentially passes through the head support 23 and the first circuit board 31, and the head support 23 is correspondingly disposed with the first circuit board 31. The second multi-pole head 22 is disposed on a side of the head support 23 close to the first circuit board 31, and a first magnetic sensitive element 32 is disposed on a side of the first circuit board 31 close to the head support, and the first magnetic sensitive element 32 is correspondingly disposed with the second multi-pole head 22 in the axial direction of the motor shaft 10. The first multi-pole head 21 is disposed on a side of the head support 23 away from the first circuit board 31, and the second magnetic sensitive element 34 is correspondingly disposed with the first multi-pole head 21 in the axial direction of the motor shaft 10, that is, the second circuit board 33 is correspondingly disposed with the head support 23, as Figure 1 shown.

[0071] According to some embodiments of the present application, the first multi-pole head 21 includes m N poles and m S poles, the m N poles and the m S poles are alternately arranged and surrounded in a circular shape, and the motor shaft 10 is located at the center of the first multi-pole head 21.

[0072] Wherein, m is an integer greater than 1. As Figure 2 shown, for example, the first multi-pole head 21 includes 10 N poles and 10 S poles, and it is also said that the number of pole pairs of the first multi-pole head 21 is 10 pairs, wherein the 10 N poles and the 10 S poles are alternately arranged and surrounded in a circular shape, and the motor shaft 10 is located at the center of the first multi-pole head 21.

[0073] According to some embodiments of the present application, the second multi-pole head 22 includes n N poles and n S poles, the n N poles and the n S poles are alternately arranged and surrounded in a circular shape, and the motor shaft 10 is located at the center of the second multi-pole head 22.

[0074] Wherein, n is an integer greater than 1, and n is not equal to m. As Figure 3As shown, for example, the second multi-pole magnetic head 22 includes 3 N poles and 3 S poles. It is also said that the number of pole pairs of the second multi-pole magnetic head 22 is 3 pairs. Among them, the 3 N poles and 3 S poles are alternately arranged and form a circular shape, and the motor rotating shaft 10 is located at the center of the second multi-pole magnetic head 22.

[0075] Specifically, as Figure 1 shown, the motor rotating shaft 10 is located at the center of the first multi-pole magnetic head 21 and the second multi-pole magnetic head 22. The first multi-pole magnetic head 21 and the second multi-pole magnetic head 22 are spaced a certain distance in the radial direction of the motor rotating shaft 10 to ensure low coupling of the magnetic heads and not affect the detection of the motor rotor position.

[0076] According to some embodiments of the present application, both m and n are relatively prime integers.

[0077] In this embodiment, both m and n are integers greater than 1, and m is greater than n; further, both m and n are odd numbers and m and n are relatively prime. For example, m is 31 and n is 3, and m and n are relatively prime.

[0078] Due to the significant increase in the number of pole pairs of the first multi-pole magnetic head 21 and the second multi-pole magnetic head 22, the resolution of the annular magnetic encoder assembly 1 can increase in proportion to the number of pole pairs. At this time, the resolution and accuracy of the annular magnetic encoder assembly 1 can be significantly improved.

[0079] According to some embodiments of the present application, the first circuit board 31 is used to obtain the single-turn relative position of the motor according to the first electrical signal.

[0080] Specifically, the motor rotating shaft 10 drives the second multi-pole magnetic head 22 to rotate. The second multi-pole magnetic head 22 generates a magnetic field change. The first magnetic sensitive element 32 senses the magnetic field change of the second multi-pole magnetic head 22 and generates a first electrical signal. The first circuit board 31 processes the first electrical signal to obtain the relative position of the motor within one turn, that is, the single-turn relative position of the motor.

[0081] According to some embodiments of the present application, the second circuit board 33 is used to obtain the relative position of the motor according to the second electrical signal.

[0082] Specifically, the motor rotating shaft 10 drives the first multi-pole magnetic head 21 to rotate. The first multi-pole magnetic head 21 generates a magnetic field change. The second magnetic sensitive element 34 senses the magnetic field change of the first multi-pole magnetic head 21 and generates a second electrical signal. The second circuit board 33 processes the second electrical signal to obtain the relative position of the motor.

[0083] Since the difference in the relative positions simultaneously output by the first magnetic sensitive element 32 and the second magnetic sensitive element 34 within one turn of the motor rotation is unique, the absolute position within one turn of the motor, that is, the single-turn absolute value of the motor, can be inferred from the difference at this time.

[0084] The present application also provides a motor, which includes but is not limited to a servo motor, a stepper motor, and a DC motor. The motor in this embodiment includes the annular magnetic encoder assembly 1 of the above embodiment, which will not be elaborated herein.

[0085] In summary, by adding the magnetic head bracket 23 composed of a high-permeability material, the first multi-pole magnetic head 21 and the second multi-pole magnetic head 22 are arranged on the magnetic head bracket 23, and the second magnetic sensitive element 34 corresponding to the first multi-pole magnetic head 21 and the first magnetic sensitive element 32 corresponding to the second multi-pole magnetic head 22 are provided; when improving the resolution and accuracy of the annular magnetic encoder assembly 1, the single-turn absolute value of the motor can be recognized.

[0086] The above are only the implementation manners of the present application, and do not limit the patent scope of the present application accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. A circular magnetic encoder assembly, characterized in that, Comprising: Motor rotating shaft; A magnetic head assembly disposed on the motor rotating shaft, the magnetic head assembly including a first multi-pole magnetic head and a second multi-pole magnetic head, the first multi-pole magnetic head being disposed on a side of the magnetic head assembly close to the motor rotating shaft, and the second multi-pole magnetic head being disposed on a side of the magnetic head assembly away from the motor rotating shaft; A circuit board assembly including a first circuit board and a first magnetic sensitive element, the first magnetic sensitive element being disposed on the first circuit board and corresponding to the second multi-pole magnetic head, and the motor rotating shaft passing through the first circuit board; When the motor rotating shaft drives the first multi-pole magnetic head and the second multi-pole magnetic head to rotate, the second multi-pole magnetic head rotates synchronously to generate a magnetic field change, and the first magnetic sensitive element is used to sense the magnetic field change of the second multi-pole magnetic head and generate a first electrical signal.

2. The annular magnetic encoder assembly according to claim 1, wherein The circuit board assembly further includes a second circuit board and a second magnetic sensitive element, the second magnetic sensitive element being disposed on the second circuit board and corresponding to the first multi-pole magnetic head, the first multi-pole magnetic head rotates synchronously to generate a magnetic field change, and the second magnetic sensitive element is used to sense the magnetic field change of the first multi-pole magnetic head and generate a second electrical signal.

3. The annular magnetic encoder assembly according to claim 2, wherein The circuit board assembly further includes a circuit board bracket, the circuit board bracket being disposed on the first circuit board, and the second circuit board being disposed on the circuit board bracket, and the circuit board bracket is used to fix the first circuit board and the second circuit board.

4. The annular magnetic encoder assembly according to claim 2, wherein, The magnetic head assembly further includes a magnetic head bracket, the magnetic head bracket being mounted on the motor rotating shaft, the motor rotating shaft passing through the magnetic head bracket and the first circuit board in sequence, the first multi-pole magnetic head being disposed on a side of the magnetic head bracket away from the first circuit board and corresponding to the second magnetic sensitive element; the second multi-pole magnetic head being disposed on a side of the magnetic head bracket close to the first circuit board and corresponding to the first magnetic sensitive element.

5. The annular magnetic encoder assembly according to claim 4, wherein The first multi-pole magnetic head includes m N poles and m S poles, the m N poles and the m S poles are alternately arranged and surround a circular shape, and the motor rotating shaft is located at the center of the first multi-pole magnetic head.

6. The annular magnetic encoder assembly according to claim 5, characterized in that, The second multi-pole magnetic head includes n N poles and n S poles, the n N poles and the n S poles are alternately arranged and surround a circular shape, and the motor rotating shaft is located at the center of the second multi-pole magnetic head.

7. The annular magnetic encoder assembly according to claim 6, wherein, Both m and n are relatively prime integers.

8. The annular magnetic encoder assembly according to claim 1, wherein, The first circuit board is used to obtain the single-turn relative position of the motor according to the first electrical signal.

9. The annular magnetic encoder assembly according to claim 2, wherein, The second circuit board is used to obtain the relative position of the motor according to the second electrical signal.

10. A motor, characterized in that, The motor includes the annular magnetic encoder assembly according to any one of claims 1-9.

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