Magnetic encoder assembly and motor

Abstract

The utility model discloses a magnetic encoder assembly and a motor. The magnetic encoder assembly comprises a motor rotating shaft; the magnetic head assembly is arranged at one end of the motor rotating shaft, the motor rotating shaft is used for driving the magnetic head assembly to rotate, and the magnetic head assembly comprises a first magnetic head and a second magnetic head; the circuit board assembly comprises at least one magneto-sensitive element and at least one circuit board, the magneto-sensitive element is arranged on the corresponding circuit board, and the magneto-sensitive element and the first magnetic head are correspondingly arranged in the axial direction of the motor rotating shaft; when the motor rotating shaft drives the magnetic head assembly to rotate, the first magnetic head and the second magnetic head synchronously rotate to generate magnetic field changes, the magneto-sensitive element senses the magnetic field changes of the first magnetic head and generates first electric signals, and the circuit board is used for processing the first electric signals. Through the arrangement of the first magnetic head and the second magnetic head, the precision and the resolution of the magnetic encoder are improved through the design of the double magnetic heads, and the reliability and the stability are further improved.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a magnetic encoder assembly and a motor. Background Art

[0002] In the field of motor technology, accurate position control and speed feedback are crucial for implementing efficient and precise automation systems. Motors are typically equipped with encoders to provide precise feedback signals, which are used in closed-loop control systems to ensure that the motor runs according to the predetermined trajectory and speed.

[0003] Magnetic encoders, a new encoder technology, use changes in the magnetic field to detect the rotational state of a motor. However, existing magnetic encoders may have design and performance deficiencies, such as low accuracy and resolution, which reduces reliability and stability. Utility Model Content

[0004] The present application mainly provides a magnetic encoder assembly and a motor to solve the problem that the accuracy and resolution of the magnetic encoder are low, resulting in reduced reliability and stability.

[0005] The present application provides a magnetic encoder assembly, comprising:

[0006] Motor shaft;

[0007] A magnetic head assembly is provided on one end of the motor shaft, the motor shaft is used to drive the magnetic head assembly to rotate, the magnetic head assembly includes a first magnetic head and a second magnetic head, the first magnetic head is provided on a side of the magnetic head assembly away from the motor shaft, and the second magnetic head is provided on a side of the magnetic head assembly close to the motor shaft;

[0008] a circuit board assembly comprising at least one magnetic sensitive element and at least one circuit board, wherein the magnetic sensitive element is disposed on the corresponding circuit board and is disposed correspondingly to the first magnetic head in the axial direction of the motor shaft, and the projections of the magnetic sensitive element, the motor shaft, and the first magnetic head on the circuit board overlap;

[0009] When the motor shaft drives the magnetic head assembly to rotate, the first magnetic head and the second magnetic head rotate synchronously to generate a magnetic field change. The magnetic sensitive element senses the magnetic field change of the first magnetic head and generates a first electrical signal. The circuit board is used to process the first electrical signal.

[0010] The magnetic head assembly includes a magnetic head support, the magnetic head support is mounted on one end of the motor shaft, and the first magnetic head is arranged on a side of the magnetic head support away from the motor shaft.

[0011] The second magnetic head is arranged on a side of the head support away from the first magnetic head, the second magnetic head includes a plurality of N poles and a plurality of S poles, the plurality of N poles and the plurality of S poles are alternately arranged and arranged in a circular shape, the motor shaft is arranged at the center of the second magnetic head, and the motor shaft is used to drive the first magnetic head and the second magnetic head to rotate synchronously.

[0012] In which, the circuit board assembly includes a first circuit board and a first magnetic sensitive element. The first magnetic sensitive element is arranged on the first circuit board and corresponds to the first magnetic head in the axial direction of the motor shaft. The first magnetic sensitive element is used to sense the magnetic field changes of the first magnetic head and generate a first electrical signal. The first circuit board processes the first electrical signal.

[0013] In which, the circuit board assembly also includes a second circuit board and a second magnetic sensitive element. The second magnetic sensitive element is arranged on the second circuit board and corresponds to the second magnetic head in the axial direction of the motor shaft. The second circuit board and the first circuit board are arranged parallel to the axial direction of the motor shaft. The second magnetic sensitive element is used to sense the magnetic field changes of the second magnetic head and generate a second electrical signal. The second circuit board processes the second electrical signal.

[0014] An inductive gap is provided between the first magnetic sensitive element and the first magnetic head; and the inductive gap is provided between the second magnetic sensitive element and the second magnetic head.

[0015] Wherein, the circuit board assembly includes a circuit board bracket, and the circuit board bracket is used to fix and support the first circuit board and the second circuit board.

[0016] When the motor shaft drives the first magnetic head to rotate, the first magnetic sensitive element is fixed on the first circuit board, and is used to sense the magnetic field changes of the first magnetic head and generate the first electrical signal. The first circuit board obtains the absolute position of the motor according to the first electrical signal.

[0017] When the motor shaft drives the second magnetic head to rotate, the second magnetic sensitive element is fixed on the second circuit board, and is used to sense the magnetic field changes of the second magnetic head and generate a second electrical signal. The second circuit board obtains the relative position of the motor according to the second electrical signal.

[0018] The present application also provides a motor, comprising the above-mentioned magnetic encoder assembly.

[0019] The beneficial effects of this application are as follows: the application arranges a magnetic head assembly at one end of a motor shaft, the magnetic head assembly comprising a first magnetic head and a second magnetic head; the circuit board assembly comprising at least one magnetic sensor and at least one circuit board, the magnetic sensor and the first magnetic head being arranged axially corresponding to each other in the motor shaft; when the motor shaft drives the magnetic head assembly to rotate, the first magnetic head rotates synchronously to generate a change in the magnetic field, the magnetic sensor senses the change in the magnetic field of the first magnetic head and generates a first electrical signal, and the circuit board corresponding to the magnetic sensor processes the first electrical signal. By providing the first and second magnetic heads, the application improves the accuracy and resolution of the magnetic encoder through a dual-head design, thereby improving reliability and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without inventive efforts. Among them:

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

[0022] Figure 2 yes Figure 1 A schematic structural diagram of an embodiment of the first magnetic head;

[0023] Figure 3 yes Figure 1 A structural schematic diagram of an embodiment of the second magnetic head. DETAILED DESCRIPTION

[0024] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

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

[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 number, specific order or primary and secondary relationship of the indicated technical features.

[0027] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0028] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

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

[0030] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0031] In the description of the embodiments of the present application, unless otherwise clearly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; they can refer to mechanical connections or electrical connections; they can refer to connections between components or indirect connections through an intermediate medium; they can refer to internal connections between two components or interactions between two components. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0032] The 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 the 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 is amplified by the amplifier circuit and output as a pulse signal or analog signal after processing by the single-chip microcomputer to achieve the measurement purpose.

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

[0034] However, existing magnetic encoders may have deficiencies in design and performance. For example, the accuracy and resolution of magnetic encoders are low, resulting in reduced reliability and stability.

[0035] This application provides a magnetic encoder assembly, see Figure 1-3 As shown, Figure 1 is a cross-sectional schematic diagram of an embodiment of a magnetic encoder assembly provided by the present application, Figure 2 yes Figure 1 A schematic structural diagram of an embodiment of the first magnetic head, Figure 3 yes Figure 1 The magnetic encoder assembly 1 of this embodiment includes a motor shaft 10, a magnetic head assembly 20 and a circuit board assembly 30.

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

[0037] The head assembly 20 is arranged on one end of the motor shaft 10. The motor shaft 10 is used to drive the head assembly 20 to rotate. The head assembly 20 includes a first head 22 and a second head 23. The first head 22 is arranged on the side of the head assembly 20 away from the motor shaft 10, and the second head 23 is arranged on the side of the head assembly 20 close to the motor shaft 10.

[0038] The magnetic head assembly 20 is a component of the magnetic encoder assembly 1 used to generate magnetic field changes. In this embodiment, the magnetic head assembly 20 includes a first magnetic head 22 and a second magnetic head 23. The first magnetic head 22 and the second magnetic head 23 are physical components that generate the magnetic field and are typically made of materials with high magnetic permeability to ensure effective generation and propagation of the magnetic field.

[0039] The head assembly 20 is usually mounted on the motor shaft 10 via a keyway or a coupling to ensure that the output of the head assembly 20 is synchronized with the rotation of the motor shaft 10 .

[0040] Optionally, the head assembly 20 is arranged on one end of the motor shaft 10, that is, one end of the motor shaft 10 is connected to the head assembly 20, the first head 22 is arranged on the side of the head assembly 20 away from the other end of the motor shaft 10, and is arranged corresponding to one end of the motor shaft 10; the second head 23 is arranged on the side of the head assembly 20 close to the other end of the motor shaft 10.

[0041] Specifically, the motor shaft 10 drives the magnetic head assembly 20 to rotate, that is, the motor shaft 10 drives the first magnetic head 22 and the second magnetic head 23 to rotate synchronously. When the first magnetic head 22 and the second magnetic head 23 rotate, periodic magnetic field changes are generated.

[0042] The circuit board assembly 30 includes at least one magnetic sensitive element and at least one circuit board. The magnetic sensitive element is arranged on the corresponding circuit board and is arranged corresponding to the first magnetic head 22 in the axial direction of the motor shaft 10. The projections of the magnetic sensitive element, the motor shaft 10 and the first magnetic head 22 on the circuit board overlap.

[0043] For example, the magnetic sensor and the first magnetic head 22 are arranged in the axial direction of the motor shaft 10, and the first magnetic head 22 is arranged corresponding to one end of the motor shaft 10. At this time, the projections of the motor shaft 10, the first magnetic head 22 and the magnetic sensor on the circuit board overlap.

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

[0045] A circuit board, also known as a printed circuit board (PCB), is a support that connects electronic components and circuits together.

[0046] In this embodiment, the magnetic sensitive element is disposed on a corresponding circuit board, and the circuit board connects the magnetic sensitive element with the circuit for processing the electrical signal generated by the magnetic sensitive element.

[0047] Optionally, the magnetic sensor and the first magnetic head 22 are correspondingly disposed in the axial direction of the motor shaft 10 . In other embodiments, the magnetic sensor and the first magnetic head 22 are correspondingly disposed in the radial direction of the motor shaft 10 .

[0048] When the motor shaft 10 drives the magnetic head assembly 20 to rotate, the first magnetic head 22 and the second magnetic head 23 rotate synchronously to generate a magnetic field change. The magnetic sensitive element senses the magnetic field change of the first magnetic head 22 and generates a first electrical signal. The circuit board is used to process the first electrical signal.

[0049] The first electrical signal refers to an electrical signal generated in response to the magnetic field change of the first magnetic head 22 sensed by the magnetic sensor.

[0050] Specifically, the motor shaft 10 drives the magnetic heads on the magnetic head assembly 20 to rotate synchronously, and the rotation of the first magnetic head 22 generates a change in the magnetic field. The magnetic sensitive element corresponding to the first magnetic head 22 on the axial direction of the motor shaft 10 senses the change in the magnetic field and generates a corresponding electrical signal, namely, a first electrical signal. The circuit board corresponding to the magnetic sensitive element processes the first electrical signal.

[0051] In this embodiment, the first magnetic head 22 and the second magnetic head 23 are provided, and the precision and resolution of the magnetic encoder assembly 1 are improved through the dual-head design, thereby improving the reliability and stability.

[0052] According to some embodiments of the present application, the head assembly 20 includes a head support 21 , which is mounted on one end of the motor shaft 10 , and a first magnetic head 22 is disposed on a side of the head support 21 away from the motor shaft 10 .

[0053] The head support 21 is a component for fixing and supporting the first head 22 and the second head 23. In this embodiment, the head support 21 is made of a high magnetic permeability material, which can effectively guide the magnetic field lines of the first head 22 and the second head 23 to pass through, thereby reducing magnetic resistance.

[0054] Optionally, the first magnetic head 22 has an N pole and an S pole that are oppositely arranged, that is, the number of pole pairs of the first magnetic head 22 is 1 pair, such as Figure 2 shown.

[0055] Specifically, the head support 21 is mounted on one end of the motor shaft 10 via a keyway or coupling. Specifically, the motor shaft 10 is located on one side of the head support 21, and the first magnetic head 22 is located on the side of the head support 21 away from the motor shaft 10. The first magnetic head 22 is arranged axially corresponding to the motor shaft 10. When the motor shaft 10 drives the magnetic head assembly 20 to rotate, the first magnetic head 22 rotates synchronously.

[0056] According to some embodiments of the present application, the second magnetic head 23 is arranged on the side of the head support 21 away from the first magnetic head 22, the second magnetic head 23 includes multiple N poles and multiple S poles, the multiple N poles and multiple S poles are alternately arranged and arranged in a circular shape, the motor shaft 10 is arranged at the center of the second magnetic head 23, and the motor shaft 10 is used to drive the first magnetic head 22 and the second magnetic head 23 to rotate synchronously.

[0057] like Figure 3 As shown, the second magnetic head 23 has ten N poles and ten S poles, which are alternately arranged and arranged in a circular shape. In this embodiment, the number of N poles and S poles of the second magnetic head 23 includes but is not limited to 10, 20, or 30. That is, the number of pole pairs of the second magnetic head 23 includes but is not limited to 10 pairs, 20 pairs, or 30 pairs.

[0058] Optionally, the second magnetic head 23 is circular and is disposed on a side of the magnetic head support 21 away from the first magnetic head 22. That is, the second magnetic head 23 and the motor shaft 10 are on the same side of the magnetic head support 21. Specifically, the motor shaft 10 is disposed at the center of the second magnetic head 23. When the motor shaft 10 drives the magnetic head assembly 20 to rotate, the first magnetic head 22 and the second magnetic head 23 rotate synchronously.

[0059] According to some embodiments of the present application, the circuit board assembly 30 includes a first circuit board 31 and a first magnetic sensitive element 32. The first magnetic sensitive element 32 is arranged on the first circuit board 31 and is arranged corresponding to the first magnetic head 22 in the axial direction of the motor shaft 10. The first magnetic sensitive element 32 is used to sense the magnetic field changes of the first magnetic head 22 and generate a first electrical signal. The first circuit board 31 processes the first electrical signal.

[0060] Optionally, the circuit board assembly 30 includes at least one magnetic sensor and at least one circuit board, namely, a first magnetic sensor 32 and a first circuit board 31. The first circuit board 31 and the magnetic head support 21 are disposed in an axial direction corresponding to the motor shaft 10. The first magnetic sensor 32 on the first circuit board 31 and the first magnetic head 22 on the magnetic head support 21 are disposed in an axial direction corresponding to the motor shaft 10. In other embodiments, the first magnetic sensor 32 and the first magnetic head 22 are disposed in a radial direction corresponding to the motor shaft 10.

[0061] Specifically, when the motor shaft 10 drives the first magnetic head 22 on the magnetic head assembly 20 to rotate synchronously, the first magnetic head 22 generates a magnetic field change. The first magnetic sensitive element 32 corresponding to the first magnetic head 22 in the axial direction of the motor shaft 10 senses the magnetic field change of the first magnetic head 22. The first magnetic sensitive element 32 generates a first electrical signal, and the first circuit board 31 processes the first electrical signal.

[0062] According to some embodiments of the present application, the circuit board assembly 30 also includes a second circuit board 33 and a second magnetic sensitive element 34. The second magnetic sensitive element 34 is arranged on the second circuit board 33 and is arranged corresponding to the second magnetic head 23 in the axial direction of the motor shaft 10. The second circuit board 33 and the first circuit board 31 are arranged in parallel in the axial direction of the motor shaft 10. The second magnetic sensitive element 34 is used to sense the magnetic field changes of the second magnetic head 23 and generate a second electrical signal. The second circuit board 33 processes the second electrical signal.

[0063] Optionally, the second circuit board 33 and the magnetic head support 21 are arranged in correspondence with each other in the axial direction of the motor shaft 10, and the second magnetic sensitive element 34 on the second circuit board 33 and the second magnetic head 23 on the magnetic head support 21 are arranged in correspondence with each other in the axial direction of the motor shaft 10; in this case, the second circuit board 33 and the first circuit board 31 are arranged in parallel in the axial direction of the motor shaft 10, as shown in FIG. Figure 1 In other embodiments, the second magnetic sensor 34 is disposed corresponding to the second magnetic head 23 in the radial direction of the motor shaft 10 .

[0064] The second electrical signal refers to the electrical signal generated in response to the second magnetic sensor 34 sensing the change in the magnetic field of the second magnetic head 23 .

[0065] Specifically, when the motor shaft 10 drives the second magnetic head 23 on the magnetic head assembly 20 to rotate synchronously, the second magnetic head 23 generates a magnetic field change. A second magnetic sensitive element 34 is arranged corresponding to the second magnetic head 23 in the axial direction of the motor shaft 10 to sense the magnetic field change of the second magnetic head 23. The second magnetic sensitive element 34 generates a second electrical signal, and the second circuit board 33 processes the second electrical signal.

[0066] According to some embodiments of the present application, an induction gap is provided between the first magnetic sensor 32 and the first magnetic head 22 ; and an induction gap is provided between the second magnetic sensor 34 and the second magnetic head 23 .

[0067] The induction gap refers to the physical space distance between the magnetic head and the magnetic sensitive element, which is used for the magnetic sensitive element to effectively sense the magnetic field changes of the magnetic head.

[0068] Optionally, the magnetic encoder assembly 1 in this embodiment further includes an encoder support (not shown), which is located between the first magnetic head 22 and the first magnetic sensitive element 32 so that there is an inductive gap between the first magnetic sensitive element 32 and the first magnetic head 22.

[0069] In this embodiment, the magnetic encoder assembly 1 is appropriately sized to ensure an effective sensing gap between the first magnetic sensor 32 and the first magnetic head 22, and an effective sensing gap between the second magnetic sensor 34 and the second magnetic head 23, axially along the motor shaft 10. This ensures that when the motor shaft 10 rotates, the first and second magnetic heads 22, 23, rotate with it. The first magnetic sensor 32 senses changes in the magnetic field of the first magnetic head 22, thereby generating an effective first electrical signal; and the second magnetic sensor 34 senses changes in the magnetic field of the second magnetic head 23, thereby generating an effective second electrical signal.

[0070] According to some embodiments of the present application, the circuit board assembly 30 includes a circuit board bracket 35 , which is used to fix and support the first circuit board 31 and the second circuit board 33 .

[0071] The circuit board bracket 35 is a component for fixing and supporting the first circuit board 31 and the second circuit board 33. Optionally, the first circuit board 31 and the second circuit board 33 are fixed to both ends of the circuit board bracket, such as Figure 1 shown.

[0072] According to some embodiments of the present application, when the motor shaft 10 drives the first magnetic head 22 to rotate, the first magnetic sensitive element 32 is fixed on the first circuit board 31, which is used to sense the magnetic field changes of the first magnetic head 22 and generate a first electrical signal. The first circuit board 31 obtains the absolute position of the motor based on the first electrical signal.

[0073] Specifically, the first circuit board 31 is fixed to the circuit board bracket 35, which also holds the first magnetic sensor 32. When the motor shaft 10 drives the first magnetic head 22 to rotate, the first magnetic sensor 32, fixed to the first circuit board 31, senses the changes in the magnetic field generated by the rotation of the first magnetic head 22. The first magnetic sensor 32 generates a first electrical signal, which is then processed by the first circuit board 31. Because the first magnetic head 22 has an opposing north pole and a south pole, corresponding to the motor shaft 10, the absolute position of the motor within one revolution, i.e., the absolute value of the motor's single revolution, can be determined based on the first electrical signal.

[0074] In this embodiment, the absolute value of a single turn of the motor can be identified through the interaction between the first magnetic head 22 and the first magnetic sensor 32 .

[0075] According to some embodiments of the present application, when the motor shaft 10 drives the second magnetic head 23 to rotate, the second magnetic sensitive element 34 is fixed on the second circuit board 33, which is used to sense the magnetic field changes of the second magnetic head 23 and generate a second electrical signal. The second circuit board 33 obtains the relative position of the motor based on the second electrical signal.

[0076] Specifically, the second circuit board 33 is fixed to the circuit board bracket 35, which also holds the second magnetic sensor 34. When the motor shaft 10 drives the second magnetic head 23 to rotate, the second magnetic sensor 34, fixed to the second circuit board 33, senses the changes in the magnetic field generated by the second magnetic head 23. The second magnetic sensor 34 generates a second electrical signal, which is then processed by the second circuit board 33. Because the second magnetic head 23 has multiple pole pairs and the motor shaft 10 is located at the center of the second magnetic head 23, the relative position of the motor can be determined based on the second electrical signal.

[0077] In this embodiment, due to the increase in the number of pole pairs of the second magnetic head 23 , the resolution of the magnetic encoder assembly 1 increases in proportion to the number of pole pairs of the second magnetic head 23 , thereby greatly improving the resolution and accuracy of the magnetic encoder assembly 1 .

[0078] 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 of this embodiment includes the magnetic encoder assembly 1 of the above embodiment, which will not be described in detail here.

[0079] The magnetic heads of existing magnetic encoders usually only use one pair of poles or multiple pairs of poles. When a one-pole head is used, that is, a head with one pair of poles, the resolution and accuracy of the magnetic encoder are low; when a multiple-pole head is used, that is, a head with multiple pairs of poles, the magnetic encoder cannot recognize the absolute value of a single turn of the motor.

[0080] The present application adds a magnetic head bracket 21 made of a high magnetic permeability material, and is provided with a first magnetic head 22 with a pair of pole pairs and a second magnetic head 23 with multiple pairs of pole pairs on the magnetic head bracket 21, and is provided with a first magnetic sensitive element 32 corresponding to the first magnetic head 22 and a second magnetic sensitive element 34 corresponding to the second magnetic head 23; while improving the resolution and accuracy of the magnetic encoder assembly 1, it is possible to identify the absolute value of a single turn of the motor.

[0081] The above description is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A magnetic encoder assembly, characterized in that: include: Motor shaft; A magnetic head assembly is provided on one end of the motor shaft, the motor shaft is used to drive the magnetic head assembly to rotate, the magnetic head assembly includes a first magnetic head and a second magnetic head, the first magnetic head is provided on a side of the magnetic head assembly away from the motor shaft, and the second magnetic head is provided on a side of the magnetic head assembly close to the motor shaft; a circuit board assembly comprising at least one magnetic sensitive element and at least one circuit board, wherein the magnetic sensitive element is disposed on the corresponding circuit board and is disposed correspondingly to the first magnetic head in the axial direction of the motor shaft, and the projections of the magnetic sensitive element, the motor shaft, and the first magnetic head on the circuit board overlap; When the motor shaft drives the magnetic head assembly to rotate, the first magnetic head and the second magnetic head rotate synchronously to generate a magnetic field change. The magnetic sensitive element senses the magnetic field change of the first magnetic head and generates a first electrical signal. The circuit board is used to process the first electrical signal.

2. The magnetic encoder assembly according to claim 1, wherein: The magnetic head assembly comprises a magnetic head support, the magnetic head support is mounted on one end of the motor shaft, and the first magnetic head is arranged on a side of the magnetic head support away from the motor shaft.

3. The magnetic encoder assembly according to claim 2, wherein: The second magnetic head is arranged on a side of the head support away from the first magnetic head, the second magnetic head includes multiple N poles and multiple S poles, the multiple N poles and the multiple S poles are arranged alternately and arranged in a circular shape, the motor shaft is arranged at the center of the second magnetic head, and the motor shaft is used to drive the first magnetic head and the second magnetic head to rotate synchronously.

4. The magnetic encoder assembly according to claim 3, wherein: The circuit board assembly includes a first circuit board and a first magnetic sensitive element. The first magnetic sensitive element is arranged on the first circuit board and corresponds to the first magnetic head in the axial direction of the motor shaft. The first magnetic sensitive element is used to sense the magnetic field changes of the first magnetic head and generate a first electrical signal. The first circuit board processes the first electrical signal.

5. The magnetic encoder assembly according to claim 4, characterized in that The circuit board assembly also includes a second circuit board and a second magnetic sensitive element. The second magnetic sensitive element is arranged on the second circuit board and corresponds to the second magnetic head in the axial direction of the motor shaft. The second circuit board and the first circuit board are arranged parallel to the axial direction of the motor shaft. The second magnetic sensitive element is used to sense the magnetic field changes of the second magnetic head and generate a second electrical signal. The second circuit board processes the second electrical signal.

6. The magnetic encoder assembly according to claim 5, wherein: An induction gap is provided between the first magnetic sensitive element and the first magnetic head; and the induction gap is provided between the second magnetic sensitive element and the second magnetic head.

7. The magnetic encoder assembly according to claim 5, wherein: The circuit board assembly includes a circuit board bracket, which is used to fix and support the first circuit board and the second circuit board.

8. The magnetic encoder assembly according to claim 7, wherein: When the motor shaft drives the first magnetic head to rotate, the first magnetic sensitive element is fixed on the first circuit board, and is used to sense the magnetic field change of the first magnetic head and generate the first electrical signal. The first circuit board obtains the absolute position of the motor according to the first electrical signal.

9. The magnetic encoder assembly according to claim 8, wherein: When the motor shaft drives the second magnetic head to rotate, the second magnetic sensitive element is fixed on the second circuit board, which is used to sense the magnetic field changes of the second magnetic head and generate a second electrical signal. The second circuit board obtains the relative position of the motor according to the second electrical signal.

10. A motor, characterized in that: The motor comprises a magnetic encoder assembly according to any one of claims 1 to 9.

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