Inductive encoder assembly and motor

Abstract

The application discloses an inductive encoder assembly and a motor. The inductive encoder assembly comprises a stator assembly, a rotor assembly, a first code disc and a second code disc. The stator assembly comprises a first coil assembly and a second coil assembly. The rotor assembly is arranged on a motor rotating shaft. The first code disc and the second code disc are arranged in correspondence with the first coil assembly and the second coil assembly in the axial direction or the radial direction of the motor rotating shaft. The first code disc and the second code disc are both provided with a sinusoidal coil and a receiving coil electrically connected with the sinusoidal coil. In this way, the failure redundancy of the inductive encoder assembly is improved.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to an inductive encoder assembly and a motor. Background Technology

[0002] In modern motor control systems, encoders serve as crucial feedback elements for accurately measuring the position and speed of the motor shaft. Traditional inductive encoders typically consist of a stator and a rotor, where the stator contains transmitting and receiving coils, while the rotor contains a code disk.

[0003] Traditional inductive encoders have a single code disk structure. When the rotor code disk or stator coil fails, the entire encoder will not work properly, resulting in low fault redundancy. Utility Model Content

[0004] This application mainly provides an inductive encoder assembly and motor to solve the problem of low fault redundancy capability of encoders.

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

[0006] The stator assembly includes a first coil assembly and a second coil assembly;

[0007] A rotor assembly is disposed on the motor shaft and is disposed opposite to the stator assembly. The rotor assembly includes a first code disk and a second code disk. The first code disk and the first coil assembly are disposed corresponding to each other in the axial or radial direction of the motor shaft. The second code disk and the second coil assembly are disposed corresponding to each other in the axial or radial direction of the motor shaft. Both the first code disk and the second code disk are provided with a sinusoidal coil and a receiving coil electrically connected to the sinusoidal coil.

[0008] When high-frequency excitation is applied to the transmitting coil in the first coil assembly and the transmitting coil in the second coil assembly, and the motor shaft drives the rotor assembly to rotate, the sinusoidal coil of the first code disk interacts with the first coil assembly to generate a first sine / cosine signal; the sinusoidal coil of the second code disk interacts with the second coil assembly to generate a second sine / cosine signal; the stator assembly is used to determine the speed and position of the motor shaft based on the first sine / cosine signal and the second sine / cosine signal.

[0009] In some embodiments, the first coil assembly and the first code disk are disposed on one side of the stator assembly, and an induction gap is provided between the first code disk and the first coil assembly; the second coil assembly and the second code disk are disposed on the side of the stator assembly away from the first code disk, and the induction gap is provided between the second code disk and the second coil assembly.

[0010] In some embodiments, the stator assembly further includes a first circuit board and a second circuit board, the first circuit board and the second circuit board being spaced apart, the first coil assembly and the first code disk being disposed on the side of the first circuit board away from the second circuit board, and the sensing gap being provided between the first code disk and the first coil assembly; the second coil assembly and the second code disk being disposed on the side of the second circuit board away from the first circuit board, and the sensing gap being provided between the second code disk and the second coil assembly.

[0011] In some embodiments, the stator assembly further includes a first circuit board and a second circuit board. The first circuit board is disposed on one side of the rotor assembly, and the first coil assembly is disposed on the side of the first circuit board close to the rotor assembly. The sensing gap is provided between the first coil assembly and the first code disk on one side of the rotor assembly. The second circuit board is disposed on the side of the rotor assembly away from the first circuit board, and the second coil assembly is disposed on the side of the second circuit board close to the rotor assembly. The sensing gap is provided between the second coil assembly and the second code disk on the side of the rotor assembly away from the first circuit board.

[0012] In some embodiments, when a high-frequency excitation is applied to the transmitting coil in the first coil assembly and the transmitting coil in the second coil assembly, and the motor shaft drives the rotor assembly to rotate, the receiving coil of the first code disk is used to generate a first induced voltage based on the high-frequency excitation, the sinusoidal coil of the first code disk is used to generate a first sinusoidal magnetic field based on the first induced voltage, and the sine and cosine receiving coils in the first coil assembly are used to induce the first sine and cosine signals based on the first sinusoidal magnetic field; the receiving coil of the second code disk is used to generate a second induced voltage based on the high-frequency excitation, the sinusoidal coil of the second code disk is used to generate a second sinusoidal magnetic field based on the second induced voltage, and the sine and cosine receiving coils in the second coil assembly are used to induce the second sine and cosine signals based on the second sinusoidal magnetic field.

[0013] In some embodiments, the motor shaft includes a first shaft and a second shaft, a first code disk is disposed on the first shaft and the first shaft passes through the stator assembly, the first code disk and the first coil assembly are correspondingly disposed on the first shaft in the axial or radial direction; a second code disk is disposed on the second shaft and the second shaft passes through the stator assembly, the second code disk and the second coil assembly are correspondingly disposed on the second shaft in the axial or radial direction; wherein the rotational speed of the first shaft is different from the rotational speed of the second shaft.

[0014] In some embodiments, the first coil assembly includes a transmitting coil and a high-precision sine / cosine receiving coil, the second coil assembly includes the transmitting coil and a low-precision sine / cosine receiving coil, the first code disk includes a high-precision code disk, and the second code disk includes a low-precision code disk.

[0015] In some embodiments, the number of sinusoidal coils in the first code disk is different from the number of sinusoidal coils in the second code disk.

[0016] In some embodiments, the stator assembly further includes a decoding circuit for determining the absolute value of the rotor assembly in a single revolution based on the first sine / cosine signal and the second sine / cosine signal.

[0017] This application also provides a motor that includes the inductive encoder assembly described above.

[0018] The beneficial effects of this application are as follows: The stator assembly in this application includes a first coil assembly and a second coil assembly, and the rotor assembly includes a first code disk and a second code disk. The first code disk and the first coil assembly are correspondingly arranged in the axial or radial direction of the motor shaft, and the second code disk and the second coil assembly are correspondingly arranged in the axial or radial direction of the motor shaft. Both the first code disk and the second code disk are provided with a sinusoidal coil and a receiving coil electrically connected to the sinusoidal coil. When the transmitting coil in the first coil assembly and the transmitting coil in the second coil assembly are subjected to high-frequency excitation, and the motor shaft drives the rotor assembly to rotate, the sinusoidal coil of the first code disk is used to interact with the first coil assembly to generate a first sine / cosine signal, and the sinusoidal coil of the second code disk is used to interact with the second coil assembly to generate a second sine / cosine signal. The stator assembly is used to determine the speed and position of the motor shaft based on the first sine / cosine signal and the second sine / cosine signal. This application sets up a first code disk corresponding to a first coil assembly, and a second code disk corresponding to a second coil assembly, forming independent detection channels and creating a redundant design. This allows the other code disk and coil assembly to continue working if one of the code disks or one of the coil assemblies fails, thus improving the fault redundancy capability of the inductive encoder assembly. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of an inductive encoder assembly provided in this application;

[0021] Figure 2 This is an exploded view of an embodiment of an inductive encoder assembly provided in this application;

[0022] Figure 3 This is a side view schematic diagram of an embodiment of the inductive encoder assembly provided in this application;

[0023] Figure 4 This is a side view schematic diagram of another embodiment of the inductive encoder assembly provided in this application;

[0024] Figure 5 This is a side view schematic diagram of another embodiment of the inductive encoder assembly provided in this application. Detailed Implementation

[0025] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0027] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.

[0028] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0029] Please see Figures 1-2 As shown, Figure 1 This is a schematic diagram of the structure of an embodiment of an inductive encoder assembly provided in this application; Figure 2 This is an exploded view of an embodiment of an inductive encoder assembly provided in this application. The inductive encoder assembly 100 of this embodiment includes a stator assembly 10 and a rotor assembly 20.

[0030] The stator assembly 10 includes a first coil assembly 11 and a second coil assembly 12.

[0031] The stator assembly 10 refers to the component in the inductive encoder assembly 100 that does not rotate with the motor shaft. The stator assembly 10 is used to generate the excitation magnetic field and receive the induced signals (such as sine and cosine signals) generated by the rotor assembly 20.

[0032] In some embodiments, the stator assembly 10 is also called a stator circuit board, and the first coil assembly 11 and the second coil assembly 12 are etched or printed on the stator assembly 10.

[0033] Optionally, the coil assembly consists of one or more coils, which are typically wound with a conductive material such as copper wire. The coil assembly is used to generate an excitation magnetic field and receive induced signals (such as sine and cosine signals).

[0034] like Figure 1 and Figure 2 As shown, in this embodiment, the first coil assembly 11 and the second coil assembly 12 are disposed on the same surface of the stator assembly 10. In other embodiments, the first coil assembly 11 and the second coil assembly 12 are located on different surfaces of the stator assembly 10.

[0035] The rotor assembly 20 is mounted on the motor shaft (not shown). The rotor assembly 20 includes a first code disk 21 and a second code disk 22. The first code disk 21 and the first coil assembly 11 are correspondingly arranged in the axial or radial direction of the motor shaft. The second code disk 22 and the second coil assembly 12 are correspondingly arranged in the axial or radial direction of the motor shaft. Both the first code disk 21 and the second code disk 22 are provided with a sinusoidal coil and a receiving coil electrically connected to the sinusoidal coil.

[0036] In this embodiment, the first code disk 21 and the second code disk 22 are used to interact with the first coil assembly 11 and the second coil assembly 12 through a sinusoidal coil and a receiving coil, respectively, to generate induction signals related to the movement of the rotor assembly 20, such as sine or cosine signals or square wave signals, so as to realize the measurement of the position and speed of the motor shaft.

[0037] Optionally, a sinusoidal coil and a receiving coil are etched or printed on the surfaces of the first code disk 21 and the second code disk 22. For example... Figure 2 As shown, the cross-sectional shape of the first code disk 21 and the second code disk 22 is annular. The sinusoidal coil is disposed inside the annulus of the first code disk 21 and the second code disk 22, and the receiving coil is disposed outside the annulus of the first code disk 21 and the second code disk 22.

[0038] In some embodiments, the rotor assembly 20 is mounted on one end of the motor shaft, and the motor shaft drives the rotor assembly 20 to rotate, while the first code disk 21 and the second code disk 22 rotate synchronously.

[0039] In some embodiments, the cross-sectional shape of the first code disk 21 and the second code disk 22 is annular, and the first code disk 21 and the second code disk 22 are concentrically arranged to form the rotor assembly 20.

[0040] like Figure 2 As shown, the first code disk 21 is an outer ring, and the second code disk 22 is an inner ring, with the first code disk 21 and the second code disk 22 arranged concentrically; the stator assembly 10 and the rotor assembly 20 are correspondingly arranged, and the cross-sectional shape of the stator assembly 10 is annular; the motor shaft is located at the center of the first code disk 21 and the second code disk 22, and the motor shaft also passes through the stator assembly 10. For example, the motor shaft passes through... Figure 1 The central blank space of the stator assembly 10 and the central blank space of the rotor assembly 20.

[0041] When high-frequency excitation is applied to the transmitting coils in the first coil assembly 11 and the second coil assembly 12, and the motor shaft drives the rotor assembly 20 to rotate, the sinusoidal coil of the first code disk 21 interacts with the first coil assembly to generate a first sine / cosine signal; the sinusoidal coil of the second code disk 22 interacts with the second coil assembly to generate a second sine / cosine signal. The stator assembly 10 is used to determine the speed and position of the motor shaft based on the first and second sine / cosine signals.

[0042] Here, high-frequency excitation refers to the high-frequency alternating current signal passed through the transmitting coil. Sine and cosine signals refer to two sets of orthogonal electrical signals generated by the motion state (such as rotation angle and speed) of the rotor assembly 20.

[0043] In some embodiments, the receiving coil of the first code disk 21 and the receiving coil of the second code disk 22 generate induced voltages under high-frequency excitation. These induced voltages cause the sinusoidal coils of the first code disk 21 and the second code disk 22 to form a sinusoidal magnetic field. The sine and cosine receiving coils in the first coil assembly 11 and the second coil assembly 12 induce electrical signals based on this sinusoidal magnetic field. The amplitude and phase of the induced electrical signals from the sine and cosine receiving coils are related to the angular position of the rotor assembly 20, forming sine and cosine signals, namely, a first sine / cosine signal and a second sine / cosine signal. The amplitude and changes of these sine and cosine signals reflect the motion state of the rotor assembly 20, including its rotational speed and position.

[0044] Optionally, after the stator assembly 10 converts the first sine and cosine signals and the second sine and cosine signals into digital signals, the speed and position of the motor shaft can be obtained through calculation.

[0045] Optionally, the first coil assembly 11 and the second coil assembly 12 of the stator assembly 10 are powered and processed separately. When the first coil assembly 11 and the second coil assembly 12 are arranged on the same stator circuit board, functional redundancy can also be achieved.

[0046] In this embodiment, the first code disk 21 is correspondingly set with the first coil assembly 11, and the second code disk 22 is correspondingly set with the second coil assembly 12, forming independent detection channels respectively, thus forming a redundant design. When one of the code disks or one of the coil assemblies is damaged, the other code disk and coil assembly can continue to work, improving the fault redundancy capability of the inductive encoder assembly 100.

[0047] According to some embodiments of this application, when the transmitting coil in the first coil assembly 11 and the transmitting coil in the second coil assembly 12 are subjected to high-frequency excitation, and the motor shaft drives the rotor assembly 20 to rotate, the receiving coil of the first code disk 21 is used to generate a first induced voltage based on the high-frequency excitation, the sinusoidal coil of the first code disk 21 is used to generate a first sinusoidal magnetic field based on the first induced voltage, and the sine and cosine receiving coils in the first coil assembly 11 are used to induce a first sine and cosine signal based on the first sinusoidal magnetic field.

[0048] The receiving coil of the second code disk 22 is used to generate a second induced voltage based on high-frequency excitation. The sinusoidal coil of the second code disk 22 is used to generate a second sinusoidal magnetic field based on the second induced voltage. The sine and cosine receiving coils in the second coil assembly 12 are used to induce a second sine and cosine signal based on the second sinusoidal magnetic field.

[0049] According to some embodiments of this application, see Figure 3 As shown, Figure 3 This is a side view schematic diagram of an embodiment of the inductive encoder assembly provided in this application; in this embodiment, the first coil assembly 11 and the first code disk 21 are disposed on one side of the stator assembly 10, and an induction gap is provided between the first code disk 21 and the first coil assembly 11; the second coil assembly 12 and the second code disk 22 are disposed on the side of the stator assembly 10 away from the first code disk 21, and an induction gap is provided between the second code disk 22 and the second coil assembly 12.

[0050] The induction gap refers to the physical spatial distance between the metal code disk and the coil assembly, which is used by the receiving coil in the coil assembly to effectively sense changes in the magnetic field.

[0051] like Figure 3As shown, the first coil assembly 11 is etched or printed on one side surface of the stator assembly 10, and the first code disk 21 is located on one side of the stator assembly 10 on which the first coil assembly 11 is disposed. The sinusoidal coil and the receiving coil are disposed on the side of the first code disk 21 close to the first coil assembly 11. The second coil assembly 12 is etched or printed on the side surface of the stator assembly 10 away from the first coil assembly 11, and the second code disk 22 is located on one side of the stator assembly 10 on which the second coil assembly 12 is disposed. The sinusoidal coil and the receiving coil are disposed on the side of the second code disk 22 close to the second coil assembly 12. At this time, the stator assembly 10 is located between the first code disk 21 and the second code disk 22.

[0052] In this embodiment, by placing the first coil assembly 11 and the first code disk 21 on one side of the stator assembly 10, and placing the second coil assembly 12 and the second code disk 22 on the side of the stator assembly 10 away from the first code disk 21, two sets of magnetic detection channels that are completely separated in the axial direction of the motor shaft are formed. This eliminates magnetic coupling crosstalk and makes the stator assembly 10 a shared component, forming an integrated, symmetrical, and compact package. While maintaining dual-channel redundant detection, the radial dimension is not increased, and the outer diameter of the inductive encoder assembly 100 is significantly reduced, achieving miniaturization and weight reduction.

[0053] According to some embodiments of this application, see Figure 4 As shown, Figure 4 This is a side view schematic diagram of another embodiment of the inductive encoder assembly provided in this application; the stator assembly 10 of this embodiment also includes a first circuit board 110 and a second circuit board 120, the first circuit board 110 and the second circuit board 120 are spaced apart, the first coil assembly 11 and the first code disk 21 are disposed on the side of the first circuit board 110 away from the second circuit board 120, and a sensing gap is provided between the first code disk 21 and the first coil assembly 11; the second coil assembly 12 and the second code disk 22 are disposed on the side of the second circuit board 120 away from the first circuit board 110, and a sensing gap is provided between the second code disk 22 and the second coil assembly 12.

[0054] like Figure 4 As shown, the first coil assembly 11 is etched or printed on the surface of the first circuit board 110 away from the second circuit board 120. The first code disk 21 is located on the side of the first circuit board 110 where the first coil assembly 11 is disposed. The sinusoidal coil and the receiving coil are disposed on the side of the first code disk 21 close to the first coil assembly 11. The second coil assembly 12 is etched or printed on the surface of the second circuit board 120 away from the first circuit board 110. The second code disk 22 is located on the side of the second circuit board 120 where the second coil assembly 12 is disposed. The sinusoidal coil and the receiving coil are disposed on the side of the second code disk 22 close to the second coil assembly 12. At this time, the first circuit board 110 and the second circuit board 120 are located between the first code disk 21 and the second code disk 22.

[0055] According to some embodiments of this application, see Figure 5 As shown, Figure 5 This is a side view schematic diagram of another embodiment of the inductive encoder assembly provided in this application; the stator assembly 10 of this embodiment also includes a first circuit board 110 and a second circuit board 120. The first circuit board 110 is disposed on one side of the rotor assembly 20, and the first coil assembly 11 is disposed on the side of the first circuit board 110 close to the rotor assembly 20. A sensing gap is provided between the first coil assembly 11 and the first code disk 21 on one side of the rotor assembly 20; the second circuit board 120 is disposed on the side of the rotor assembly 20 away from the first circuit board 110, and the second coil assembly 12 is disposed on the side of the second circuit board 120 close to the rotor assembly 20. A sensing gap is provided between the second coil assembly 12 and the second code disk 22 on the side of the rotor assembly 20 away from the first circuit board 110.

[0056] like Figure 5 As shown, the first code disk 21 and the second code disk 22 are concentrically arranged. The first code disk 21 is correspondingly arranged with the first coil assembly 11 on the first circuit board 110, and the second code disk 22 is correspondingly arranged with the second coil assembly 12 on the second circuit board 120. At this time, the rotor assembly 20 composed of the first code disk 21 and the second code disk 22 is located between the first circuit board 110 and the second circuit board 120.

[0057] According to some embodiments of this application, the motor shaft includes a first shaft (not shown) and a second shaft (not shown). A first code disk 21 is disposed on the first shaft, and the first shaft passes through the stator assembly 10. The first code disk 21 and the first coil assembly 11 are correspondingly disposed on the first shaft in the axial or radial direction. A second code disk 22 is disposed on the second shaft, and the second shaft passes through the stator assembly 10. The second code disk 22 and the second coil assembly 12 are correspondingly disposed on the second shaft in the axial or radial direction.

[0058] The rotational speed of the first shaft is different from that of the second shaft.

[0059] In some embodiments, when the stator assembly 10 is located between the first code disk 21 and the second code disk 22, the first code disk 21 and the second code disk 22 are respectively disposed on the first rotating shaft and the second rotating shaft with different rotational speeds, and the first rotating shaft and the second rotating shaft are also inserted through the stator assembly 10; at this time, the speed and position of the first rotating shaft and the speed and position of the second rotating shaft can be determined simultaneously by the first code disk 21 and the second code disk 22; furthermore, when there is a fixed ratio between the rotational speeds of the first rotating shaft and the second rotating shaft, the first rotating shaft and the second rotating shaft are like the input shaft and the output shaft of a reducer. After multiplying by the fixed ratio between the rotational speeds of the first rotating shaft and the second rotating shaft, the first code disk 21 and the second code disk 22 have no common divisor.

[0060] In some embodiments, when the first circuit board 110 and the second circuit board 120 are located between the first code disk 21 and the second code disk 22, the first code disk 21 and the second code disk 22 are respectively disposed on the first rotating shaft and the second rotating shaft with different rotation speeds, and the first rotating shaft and the second rotating shaft are respectively passed through the first circuit board 110 and the second circuit board 120; at this time, the speed and position of the first rotating shaft and the speed and position of the second rotating shaft can be determined simultaneously by the first code disk 21 and the second code disk 22; furthermore, when there is a fixed ratio between the rotation speeds of the first rotating shaft and the second rotating shaft, the first rotating shaft and the second rotating shaft are like the input shaft and the output shaft of a reducer. After multiplying by the fixed ratio between the rotation speeds of the first rotating shaft and the second rotating shaft, the first code disk 21 and the second code disk 22 have no common divisor.

[0061] For example, when the motor has a speed reducer, the input shaft of the speed reducer serves as the first rotating shaft, and the output shaft of the speed reducer serves as the second rotating shaft. In other embodiments, the input shaft of the speed reducer serves as the second rotating shaft, and the output shaft of the speed reducer serves as the first rotating shaft.

[0062] Compared to the existing technology where each shaft has two encoders, this embodiment can identify the position and speed of two motor shafts with different speeds by setting up a first shaft and a second shaft, saving an inductive encoder assembly 100.

[0063] Optionally, although the first coil assembly 11 and the second coil assembly 12, the first code disk 21 and the second code disk 22 can be separated, the first coil assembly 11, the second coil assembly 12, the first code disk 21 and the second code disk 22 still need to be combined together in order to determine the absolute position of the rotor assembly 20 in a single turn.

[0064] According to some embodiments of this application, the number of sinusoidal coils in the first code disk 21 is different from the number of sinusoidal coils in the second code disk 22.

[0065] In some embodiments, the first code disk 21 is a high-precision code disk, and the second code disk 22 is a low-precision code disk. The number of sinusoidal coils in the first code disk 21 is greater than the number of sinusoidal coils in the second code disk 22. For example, the first code disk 21 has 16 sinusoidal coils, and the second code disk 22 has 3 sinusoidal coils.

[0066] In other embodiments, the number of sinusoidal coils in the first code disk 21 is less than the number of sinusoidal coils in the second code disk 22.

[0067] According to some embodiments of this application, the stator assembly 10 further includes a decoding circuit (not shown) for determining the absolute value of the rotor assembly in a single revolution based on a first sine / cosine signal and a second sine / cosine signal.

[0068] According to some embodiments of this application, the first coil assembly 11 includes a transmitting coil and a high-precision sine / cosine receiving coil, the second coil assembly 12 includes a transmitting coil and a low-precision sine / cosine receiving coil, the first code disk 21 includes a high-precision code disk, and the second code disk 22 includes a low-precision code disk.

[0069] Among them, a high-precision sine / cosine receiving coil refers to a coil used to receive high-precision sine / cosine signals, typically possessing high sensitivity characteristics. A high-precision sine / cosine receiving coil can accurately measure the position and speed of a motor shaft, providing a high-resolution feedback signal (sine / cosine signal). A high-precision code disk refers to a code disk used to generate a high-precision magnetic field distribution.

[0070] A low-precision sine / cosine receiving coil refers to a coil used to receive sine / cosine signals, and the coil's precision is relatively low. A low-precision code disk refers to a code disk used to generate a magnetic field distribution, and the uniformity and stability of the magnetic field distribution are relatively low. In some embodiments, a high-precision code disk is correspondingly set with a high-precision sine / cosine receiving coil; and a low-precision code disk is correspondingly set with a low-precision sine / cosine receiving coil.

[0071] In some embodiments, the correspondence between the transmitting coil and the sine / cosine receiving coil in the coil assembly is one-to-one. In other embodiments, the correspondence between the transmitting coil and the sine / cosine receiving coil in the coil assembly is many-to-one or one-to-many; for example, two transmitting coils correspond to one sine / cosine receiving coil.

[0072] This embodiment constructs a high-precision channel (high-precision sine and cosine receiving coils and a high-precision code disk) and a low-precision channel (low-precision sine and cosine receiving coils and a low-precision code disk) by setting up a high-precision sine and cosine receiving coil, a high-precision code disk, a low-precision sine and cosine receiving coil, and a low-precision code disk. Even if the high-precision channel fails, the low-precision channel can still provide basic measurement functions, thereby enhancing the reliability and fault tolerance of the inductive encoder assembly 100.

[0073] Another embodiment of this application provides a motor including the inductive encoder assembly 100 of the above embodiment.

[0074] In summary, this application establishes independent detection channels by setting the first code disk 21 corresponding to the first coil assembly 11 and the second code disk 22 corresponding to the second coil assembly 12, thus forming a redundant design. This design allows the other code disk and coil assembly to continue working even if one of the code disks or one of the coil assemblies fails, thereby improving the fault redundancy capability of the inductive encoder assembly 100.

[0075] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. An inductive encoder assembly, characterized in that, include: The stator assembly includes a first coil assembly and a second coil assembly; A rotor assembly is disposed on the motor shaft and is disposed opposite to the stator assembly. The rotor assembly includes a first code disk and a second code disk. The first code disk and the first coil assembly are disposed corresponding to each other in the axial or radial direction of the motor shaft. The second code disk and the second coil assembly are disposed corresponding to each other in the axial or radial direction of the motor shaft. Both the first code disk and the second code disk are provided with a sinusoidal coil and a receiving coil electrically connected to the sinusoidal coil. When high-frequency excitation is applied to the transmitting coil in the first coil assembly and the transmitting coil in the second coil assembly, and the motor shaft drives the rotor assembly to rotate, the sinusoidal coil of the first code disk interacts with the first coil assembly to generate a first sine / cosine signal; the sinusoidal coil of the second code disk interacts with the second coil assembly to generate a second sine / cosine signal; the stator assembly is used to determine the speed and position of the motor shaft based on the first sine / cosine signal and the second sine / cosine signal.

2. The inductive encoder assembly according to claim 1, characterized in that, The first coil assembly and the first code disk are disposed on one side of the stator assembly, and an induction gap is provided between the first code disk and the first coil assembly; the second coil assembly and the second code disk are disposed on the side of the stator assembly away from the first code disk, and the induction gap is provided between the second code disk and the second coil assembly.

3. The inductive encoder assembly according to claim 1, characterized in that, The stator assembly further includes a first circuit board and a second circuit board, the first circuit board and the second circuit board being spaced apart, the first coil assembly and the first code disk being disposed on the side of the first circuit board away from the second circuit board, and an induction gap being provided between the first code disk and the first coil assembly; the second coil assembly and the second code disk being disposed on the side of the second circuit board away from the first circuit board, and the induction gap being provided between the second code disk and the second coil assembly.

4. The inductive encoder assembly according to claim 1, characterized in that, The stator assembly further includes a first circuit board and a second circuit board. The first circuit board is disposed on one side of the rotor assembly, and the first coil assembly is disposed on the side of the first circuit board close to the rotor assembly. A sensing gap is provided between the first coil assembly and the first code disk on one side of the rotor assembly. The second circuit board is disposed on the side of the rotor assembly away from the first circuit board, and the second coil assembly is disposed on the side of the second circuit board close to the rotor assembly. The sensing gap is provided between the second coil assembly and the second code disk on the side of the rotor assembly away from the first circuit board.

5. The inductive encoder assembly according to any one of claims 1-4, characterized in that, When a high-frequency excitation is applied to the transmitting coil in the first coil assembly and the transmitting coil in the second coil assembly, and the motor shaft drives the rotor assembly to rotate, the receiving coil of the first code disk generates a first induced voltage based on the high-frequency excitation, the sinusoidal coil of the first code disk generates a first sinusoidal magnetic field based on the first induced voltage, and the sine and cosine receiving coils in the first coil assembly induce the first sine and cosine signals based on the first sinusoidal magnetic field; the receiving coil of the second code disk generates a second induced voltage based on the high-frequency excitation, the sinusoidal coil of the second code disk generates a second sinusoidal magnetic field based on the second induced voltage, and the sine and cosine receiving coils in the second coil assembly induce the second sine and cosine signals based on the second sinusoidal magnetic field.

6. The inductive encoder assembly according to claim 5, characterized in that, The motor shaft includes a first shaft and a second shaft. The first code disk is disposed on the first shaft, and the first shaft passes through the stator assembly. The first code disk and the first coil assembly are correspondingly arranged in the axial or radial direction of the first shaft. The second code disk is disposed on the second shaft, and the second shaft passes through the stator assembly. The second code disk and the second coil assembly are correspondingly arranged in the axial or radial direction of the second shaft. The rotational speed of the first shaft is different from that of the second shaft.

7. The inductive encoder assembly according to claim 1, characterized in that, The first coil assembly includes a transmitting coil and a high-precision sine / cosine receiving coil, the second coil assembly includes the transmitting coil and a low-precision sine / cosine receiving coil, the first code disk includes a high-precision code disk, and the second code disk includes a low-precision code disk.

8. The inductive encoder assembly according to claim 1, characterized in that, The number of sinusoidal coils in the first code disk is different from the number of sinusoidal coils in the second code disk.

9. The inductive encoder assembly according to claim 1, characterized in that, The stator assembly further includes a decoding circuit, which is used to determine the absolute value of the rotor assembly in a single revolution based on the first sine and cosine signals and the second sine and cosine signals.

10. An electric motor, characterized in that, The motor includes an inductive encoder assembly as described in any one of claims 1-9.

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