Inductive sensor and motor system

Abstract

The utility model discloses an induction type sensor, comprising a metal rotating member, the metal rotating member comprises a rotor end plate, the surface of the rotor end plate is provided with a plurality of metal induction members, the plurality of metal induction members are rotatably and symmetrically arranged, and the metal rotating member can rotate synchronously with a rotor of a motor, so that the rotor end plate and the rotor rotate synchronously; the circuit board is provided with an exciting coil and a receiving coil, and the circuit board and any one of the metal induction pieces are arranged in a spaced mode. The utility model can reduce the cost and simplify the assembly process. The utility model also provides a motor system.

Description

Technical Field

[0001] The utility model relates to the field of motors, and in particular to an inductive sensor and a motor system. Background Art

[0002] New energy motors are usually composed of rotors, stators, shafts and other components. When current passes through the coil of the stator copper wire, a magnetic field is generated to make the rotor rotate, thereby outputting torque. Accurate rotor speed and position information are crucial for the motor to accurately output torque and control speed. Therefore, in order to achieve control of the motor, sensors are usually required to monitor the speed and position signals of the motor rotor, thereby achieving control of the motor and ensuring efficient operation of the motor.

[0003] Currently, commonly used sensor types include spinning transformers, anisotropic magnetoresistive sensors, inductive sensors, and Hall effect sensors. Among them, inductive sensors are widely used in new energy motors due to their advantages such as high measurement accuracy, good robustness, low cost, and small installation space. However, in the use of inductive sensors, it is necessary to additionally couple a metal inductive component to the rotor of the motor as the detection body of the inductive sensor. The dimensional chain is cumbersome, which makes the assembly process of the inductive sensor complicated, and at the same time increases the assembly cost and the accuracy requirements for the metal inductive component coupled to the motor rotor. Utility Model Content

[0004] The utility model aims to solve the problems of high cost, complicated installation process and cumbersome dimension chain of inductive sensors. The utility model provides an inductive sensor and motor system, which can reduce costs and simplify assembly process.

[0005] In order to solve the above technical problems, the embodiment of the utility model discloses an inductive sensor, comprising:

[0006] A metal rotating part, the metal rotating part comprises a rotor end plate, a surface of the rotor end plate is provided with a plurality of metal induction parts, the plurality of metal induction parts are arranged rotationally symmetrically, the metal rotating part can rotate synchronously with the rotor of the motor, so that the rotor end plate rotates synchronously with the rotor;

[0007] A circuit board is provided with an excitation coil and a receiving coil, and the circuit board is spaced apart from any one of the plurality of metal induction components.

[0008] By adopting the above technical solution, since the rotor end plate itself is a metal component (such as copper / aluminum), the material of the rotor end plate itself can be directly utilized. By arranging multiple metal sensing parts on the rotor end plate to serve as the detection body of the inductive sensor, there is no need to add additional parts to the metal rotating parts to serve as the detection body. Multiple metal sensing parts can be manufactured as the detection body at the same time as the rotor end plate is manufactured, that is, no additional manufacturing steps are required, which simplifies and saves the assembly process and reduces the assembly cost.

[0009] At the same time, an excitation coil is provided on the circuit board. After power is turned on, the excitation coil generates a magnetic field to form magnetic flux lines. The metal rotating part rotates to cut the magnetic flux lines to generate current and generate a reverse magnetic field, causing the receiving coil on the circuit board to receive voltage fluctuations, thereby measuring the rotational speed of the metal rotating part, thereby measuring the rotational speed of the rotor rotating synchronously therewith; at the same time, multiple metal sensing parts will affect the magnetic field fluctuations of the excitation coil, and the positions of the multiple metal sensing parts are determined by the changes in the magnetic field of the excitation coil, thereby determining the position of the metal rotating part, and the multiple metal sensing parts are rotationally symmetrically arranged, which makes signal processing of the metal sensing parts more convenient.

[0010] According to another specific embodiment of the utility model, the embodiment of the utility model discloses an inductive sensor, along the first direction, the gap between the circuit board and any one of the multiple metal sensing parts is 3mm-4.5mm, and the thickness of the multiple metal sensing parts is 4mm-8mm.

[0011] According to another specific embodiment of the present utility model, the embodiment of the present utility model discloses an inductive sensor, wherein the rotor end plate is recessed with a receiving area, and the plurality of metal sensing parts are convexly disposed in the receiving area.

[0012] According to another specific embodiment of the present utility model, an embodiment of the present utility model discloses an inductive sensor, wherein the plurality of metal inductive components are integrally formed with the rotor end plate.

[0013] By adopting the above technical solution, multiple metal sensing parts are integrally formed with the rotor end plate, and there is no need to assemble multiple metal sensing parts additionally, which simplifies the assembly process and saves assembly costs. At the same time, the one-piece molding design improves the fit between the metal sensing parts and the rotor end plate, reduces the precision requirements for the metal sensing parts, and avoids assembly errors caused by the coupling process of the two tooling.

[0014] According to another specific implementation of the present utility model, an implementation of the present utility model discloses an inductive sensor, wherein the number of the metal sensing parts is four.

[0015] According to another specific embodiment of the present utility model, the embodiment of the present utility model discloses an inductive sensor, the rotor end plate also includes a connecting hole and a connecting member, the connecting hole penetrates the rotor end plate along a first direction for connecting the rotating shaft, the connecting member is protruded from the outer periphery of the connecting hole, and the multiple metal sensing parts are all connected to the connecting member and are rotationally symmetrically arranged relative to the connecting member.

[0016] By adopting the above technical solution, a connecting hole is set for connecting the rotating shaft, and the rotating shaft can provide a guide to ensure the stability of the rotor end plate during rotation. A connecting piece is protruding from the outer periphery of the connecting hole, and multiple metal sensing parts are connected at the same time, so that the multiple metal sensing parts are connected to the rotor end plate, so that the multiple metal sensing parts can rotate synchronously with the rotor end plate, ensuring that the metal sensing parts can accurately feedback the position signal of the metal rotating parts.

[0017] According to another specific embodiment of the present utility model, the embodiment of the present utility model discloses an inductive sensor, wherein along a first direction, a projection of any one of the plurality of metal sensing parts is a hollow sector ring.

[0018] By adopting the above technical solution, multiple metal sensing parts are set as hollow fan rings, which is easier to design than solid design, and can also reduce the weight of the metal sensing parts, while reducing assembly materials and saving assembly costs.

[0019] According to another specific embodiment of the present utility model, an embodiment of the present utility model discloses an inductive sensor, wherein the metal rotating part is provided with a plurality of weight-reducing holes, and the plurality of weight-reducing holes are arranged at intervals along the circumference of the metal rotating part.

[0020] By adopting the above technical solution and setting a plurality of weight-reducing holes, it is easier to design compared with a solid design, and can also reduce the weight of the metal rotating parts, while reducing assembly materials and saving assembly costs.

[0021] The embodiment of the utility model further discloses an inductive sensor, comprising: a plurality of metal inductive members, the plurality of metal inductive members being formed on a rotor end plate so as to be able to rotate synchronously with a motor rotor, the plurality of metal inductive members being arranged rotationally symmetrically;

[0022] A circuit board is provided with an excitation coil and a receiving coil for the plurality of metal induction components, and the circuit board is spaced apart from any one of the plurality of metal induction components.

[0023] The embodiment of the utility model further discloses a motor system, comprising:

[0024] The rotor comprises a plurality of silicon steel sheets stacked along a first direction;

[0025] A first rotor end plate and a second rotor end plate are respectively arranged at two ends of the rotor along the first direction and fixedly connected to the rotor, wherein one or more metal induction parts are arranged on the first rotor end plate;

[0026] A circuit board is provided separately from the rotor, and an excitation coil and a receiving coil are provided on the circuit board to sense the position of the one or more metal sensing parts. With the above technical solution, the first rotor end plate integrates the functions of dynamic balancing, protecting the magnetic steel, tightening the plurality of silicon steel sheets, and measuring the rotation speed.

[0027] According to another specific embodiment of the present utility model, an embodiment of the present utility model discloses a motor system, wherein the circuit board is arranged on a side of the rotor close to the first rotor end plate along the first direction, and is spaced apart from the first rotor end plate.

[0028] According to another specific embodiment of the present utility model, an embodiment of the present utility model discloses a motor system, wherein the motor system further comprises a motor housing, and the circuit board is fixedly connected to the motor housing.

[0029] By adopting the above technical solution to connect the circuit board to the motor housing, the stability of the circuit board can be ensured.

[0030] According to another specific embodiment of the present utility model, an embodiment of the present utility model discloses a motor system, wherein the motor system further includes a stator, and the circuit board and the stator are relatively stationary.

[0031] According to another specific embodiment of the present utility model, an embodiment of the present utility model discloses a motor system, wherein the one or more metal induction components are integrally formed with the first rotor end plate.

[0032] By adopting the above technical solution, one or more metal sensing parts are integrally formed with the first rotor end plate, and there is no need to assemble one or more metal sensing parts additionally, which simplifies the assembly process and saves assembly costs. At the same time, the one-piece molding design improves the fit between one or more metal sensing parts and the first rotor end plate, reduces the precision requirements for one or more metal sensing parts, and avoids assembly errors caused during the coupling process of the two tooling.

[0033] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a motor system, wherein the number of the one or more metal induction components is multiple, and the multiple metal induction components are evenly arranged along the circumference of the first rotor end plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1The three-dimensional diagram of the motor system provided by the embodiment of the utility model is shown. Figure 1 ;

[0035] Figure 2 The three-dimensional diagram of the motor system provided by the embodiment of the utility model is shown. Figure 2 , where the motor housing is omitted;

[0036] Figure 3 The three-dimensional diagram of the inductive sensor provided by the embodiment of the utility model is shown Figure 1 ;

[0037] Figure 4 A three-dimensional diagram of a metal rotating member provided by an embodiment of the utility model is shown;

[0038] Figure 5 A schematic projection diagram of a metal sensing element provided by an embodiment of the utility model is shown;

[0039] Figure 6 The inductive sensor provided by the embodiment of the utility model is shown in FIG. Figure 2 . DETAILED DESCRIPTION

[0040] The following is an explanation of the implementation of the present invention by specific specific embodiments. Those skilled in the art can easily understand other advantages and functions of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation. On the contrary, the purpose of introducing the utility model in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0041] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0042] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model 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 utility model.

[0043] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0044] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0045] When using motors, sensors are usually used to monitor the speed and position signals of the motor rotor to ensure the efficient operation of the motor. At the same time, when the motor is used in the automotive field, it can also increase the driving comfort of the car and maintain functional safety. Among them, the most commonly used sensors include: resolver, anisotropic magnetoresistive sensor, Hall effect sensor and inductive sensor.

[0046] However, the cost of the rotary transformer is high, and the inertia force is relatively large at high speeds. Since it needs to be installed on the rotor and the shell respectively, it has high requirements for the mechanical dimension chain, high excitation power consumption, and there is a possibility of being affected by other magnetic fields. Anisotropic magnetoresistive sensors and Hall effect sensors require separate magnets to provide magnetic fields, have relatively high requirements for the axial installation distance, and large dimension chains affect the measurement accuracy.

[0047] Since the inductive sensor is installed at a perpendicular position to the magnetic field of the rotor, it is not affected by leakage magnetic steel and can detect the angle of the rotor as long as the rotor rotates. In addition, the amount of copper wire used is much lower than that of the rotary transformer, making the assembly cost lower than that of the rotary transformer. Among them, the circuit board of the inductive sensor can be integrated with other applications of the motor without being developed and used separately, thus saving installation costs and space. Therefore, it is widely used in new energy motors.

[0048] However, when the inductive sensor is in use, it is necessary to additionally couple a metal sensing part as a detection body, which makes the process complicated and requires high assembly accuracy. Therefore, the utility model uses the element formed on the rotor end plate as the detection body in the inductive sensor, thereby reducing costs, simplifying the assembly process, and reducing accuracy requirements.

[0049] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0050] refer to Figure 1 and Figure 2 The present application provides a motor system, comprising: a rotor formed by six groups of silicon steel sheets 20, an inductive sensor 1, a motor housing 21, a second rotor end plate 22 and a rotating shaft 23, wherein the combination Figure 3 The rotating shaft 23 passes through the connecting hole 103, and the six groups of silicon steel sheets 20 are arranged along the first direction (i.e. Figure 1 The silicon steel sheets 20 are stacked in the X direction as shown. Each group of silicon steel sheets 20 is formed by stacking a plurality of silicon steel sheets. In the illustrated embodiment, any two silicon steel sheets from the same group of silicon steel sheets 20 have the same rotation angle relative to the reference position; and any two silicon steel sheets from two adjacent groups of silicon steel sheets 20 may have different rotation angles relative to the reference position, thereby forming a skewed pole structure in the rotor.

[0051] However, the present application does not limit the number of groups of silicon steel sheets 20, and can be selected according to the actual needs of the motor, for example, eight groups of silicon steel sheets 20 can be stacked along the first direction, or seven groups of silicon steel sheets 20 can be stacked along the first direction, or ten groups of silicon steel sheets 20 can be stacked along the first direction. Exemplarily, the first direction is the axial direction of the silicon steel sheets 20.

[0052] Combine the following Figures 3 to 6 The structure of the inductive sensor 1 is introduced in detail.

[0053] refer to Figure 3 and Figure 4 The present application provides an inductive sensor 1, which can be applied to new energy motors, coolers or production equipment, etc., including a metal rotating part 10 and a circuit board 11. The metal rotating part 10 includes a rotor end plate 101. The surface of the rotor end plate 101 is provided with four metal sensing parts 102. The four metal sensing parts 102 are rotationally symmetrically arranged. The metal rotating part 10 can rotate, for example, after the metal rotating part 10 is fixedly connected to the rotor (for example, connected by screws), it can rotate synchronously with the rotor, so that the rotor end plate 101 and the metal sensing part 102 also rotate synchronously with the rotor; the circuit board 11 is provided with an excitation coil 111 and a receiving coil 112, along a first direction (that is, the axial direction of the metal rotating part 10, such as Figure 4The circuit board 11 is spaced apart from any one of the four metal sensing members 102 (in the X direction shown in the figure).

[0054] Since the rotor end plate 101 itself is a metal component (such as copper / aluminum), the material of the rotor end plate 101 itself can be directly utilized. By setting four metal sensing parts 102 on the rotor end plate 101 to serve as the detection body of the inductive sensor 1, there is no need to add additional parts to the metal rotating part 10 to serve as the detection body. The four metal sensing parts 102 can be manufactured at the same time as the rotor end plate 101 to serve as the detection body, that is, no additional manufacturing steps are required, which simplifies and saves the assembly process and reduces the assembly cost.

[0055] At the same time, a coil is arranged on the circuit board, and the circuit board 11 can be integrated with the motor circuit board without additional settings, saving materials and reducing assembly costs. An excitation coil 111 is arranged on the circuit board 11. After power is turned on, the excitation coil 111 generates a magnetic field to form magnetic flux lines. The metal rotating part 10 rotates to cut the magnetic flux lines to generate current and generate a reverse magnetic field, causing the receiving coil 112 on the circuit board 11 to receive voltage fluctuations, thereby measuring the rotation speed of the metal rotating part 10, thereby measuring the rotation speed of the rotor rotating synchronously therewith; at the same time, the four metal sensing parts 102 will affect the magnetic field fluctuations of the excitation coil 111, and the positions of the four metal sensing parts 102 are determined by the magnetic field changes of the excitation coil 111, thereby determining the position of the metal rotating part 10, and the four metal sensing parts 102 are rotationally symmetrically arranged, which makes it more convenient to process the signals of the metal sensing parts 102.

[0056] It should be noted that the present application does not limit the number, size, location and shape of the metal sensing element 102, as long as it can be arranged rotationally symmetrically. For example, the present application shows that the metal sensing element 102 is arranged along the circumference of the connecting element 104 described later (i.e. Figure 4 There are four metal sensing parts 102 evenly distributed in the direction A shown in the figure. At this time, the rotation angle of the four metal sensing parts 102 is 360° / 4=90°. It can also be set as three metal sensing parts 102, and the three metal sensing parts 102 are evenly distributed along the circumference of the connecting part 104 described later and are rotationally symmetrically arranged, and the rotation angle is 360° / 3=120°, or it can be set as five metal sensing parts 102, and the five metal sensing parts 102 are evenly distributed along the circumference of the connecting part 104 described later and are rotationally symmetrically arranged, and the rotation angle is 360° / 5=72°.

[0057] It should be noted that the present application does not limit the specific positions of the excitation coil 111 and the receiving coil 112 . They can be formed together on one side of the circuit board 11 as shown in the embodiment of the present application, or they can be formed separately on the front and back sides of the circuit board 11 .

[0058] Combine the following Figure 4and Figure 5 The structure of the metal rotating part 10 is introduced in detail, wherein: Figure 4 shows a perspective view of a metal rotating member 10, Figure 5 A schematic projection diagram of any metal sensing element 102 is shown.

[0059] For example, reference Figure 4 The rotor end plate 101 also includes a connecting hole 103 and a connecting member 104. Figure 4 In the direction a shown in FIG. 1 , the rotor end plate 101 is recessed inward to form a receiving area 107, and the connecting member 104 and the four metal sensing members 102 are protruded in the receiving area 107, wherein the connecting hole 103 is along the first direction (i.e. Figure 4 X direction as shown) penetrates the rotor end plate 101 and is used to connect the above-mentioned rotating shaft 23 (reference Figure 1 ), the connecting member 104 is convexly disposed on the outer peripheral edge 1031 of the connecting hole 103, that is, the connecting member 104 is disposed along Figure 4 The four metal sensing components 102 are connected to the outer wall 1041 of the connecting component 104 and are arranged rotationally symmetrically with respect to the connecting component 104 .

[0060] A connecting hole 103 is provided for connecting the rotating shaft, and the rotating shaft can provide a guide so that the rotor end plate 101 can be stable during rotation. A connecting piece 104 is protruded from the outer periphery 1031 of the connecting hole 103, and four metal sensing pieces 102 are connected at the same time, thereby connecting the four metal sensing pieces 102 to the rotor end plate 101, so that the four metal sensing pieces 102 can rotate synchronously with the rotor end plate 101, and ensure that the metal sensing pieces 102 can accurately feedback the position signal of the metal rotating piece 10.

[0061] For example, continue to refer to Figure 4 The four metal induction components 102 are integrally formed with the rotor end plate 101 , and the four metal induction components 102 are formed on the outer wall 1041 of the connecting component 104 in the form of long ribs.

[0062] In other words, there is no need to assemble four additional metal sensing parts 102, which simplifies the assembly process and saves assembly costs. At the same time, the one-piece molding design improves the fit between the metal sensing part 102 and the rotor end plate 101, reduces the precision requirements for the metal sensing part 102, and avoids assembly errors caused during the coupling process of the two tooling (i.e., the metal sensing part 102 and the rotor end plate 101).

[0063] For example, reference Figure 4 and Figure 5 , along the first direction (i.e. Figure 4 The projection of any one of the four metal sensing elements 102 is a hollow sector ring (eg, Figure 5 As shown), the four metal sensing parts 102 are all set as hollow fan rings, which is easier to design than a solid design, and can also reduce the weight of the metal sensing parts 102, while reducing assembly materials and saving assembly costs.

[0064] That is to say, any one of the four metal sensing components 102 is provided with a through hole 106 , and the through hole 106 penetrates the metal sensing component 102 along the first direction.

[0065] For example, reference Figure 4 The metal rotating member 10 is provided with eight weight-reducing holes 105, of which four weight-reducing holes 105 are arranged along the circumference of the connecting member 104 (i.e. Figure 4 That is, one weight-reducing hole 105 is arranged between two metal induction parts 102, and the other four weight-reducing holes 105 are arranged at intervals with the four metal induction parts 102 along the radial direction of the connecting hole 103.

[0066] By providing eight weight-reducing holes 105 , compared with a solid design, it is easier to design and can also reduce the weight of the metal rotating part 10 , while reducing assembly materials and saving assembly costs.

[0067] It should be noted that the present application does not specifically limit the number and position of the weight-reducing holes 105. It may be that eight weight-reducing holes 105 are set as shown in the embodiment of the present application, and the position setting is as described above, or six weight-reducing holes 105 are set, and the six weight-reducing holes 105 are all set on the outside of the metal sensing part 102 and are set at intervals along the circumference of the metal rotating part 10, or ten weight-reducing holes 105 are set, of which four weight-reducing holes 105 are along the circumference of the connecting part 104 (i.e. Figure 4 That is, one weight-reducing hole 105 is arranged between two metal sensing parts 102, and the other six weight-reducing holes 105 are arranged on the outer circle of the four weight-reducing holes 105 and are arranged at intervals along the circumference of the accommodating area 107.

[0068] For example, reference Figure 6 , along the first direction (i.e. Figure 6 X direction shown), the thickness of the four metal sensing members 102 (i.e. Figure 6 The H) shown in the figure is 4 mm-8 mm, for example, H = 4 mm, 4.2 mm, 5.3 mm, 6.5 mm, 7.4 mm, 8 mm, etc., along the first direction (i.e. Figure 6 The gap between the circuit board 11 and any metal sensing element 102 is 3 mm to 4.5 mm (i.e. Figure 6L shown, for example, L = 3mm, 3.4mm, 3.8mm, 3.9mm, 4mm, 4.25mm, 4.5mm, etc.

[0069] It should be noted that the reference Figure 3 The inductive sensor 1 also includes a processing circuit (for example, a semiconductor chip including an integrated circuit, not shown in the figure) for processing the inductive signal received by the receiving coil 112. The processing circuit can be arranged on the circuit board 11 (that is, arranged on the same circuit board 11 as the receiving coil); or arranged on another circuit board. When the processing circuit is arranged on another circuit board, the inductive signal received by the receiving coil 112 can be transmitted to the other circuit board through a signal line so that the processing circuit can process it; at the same time, the processor or controller already equipped for the motor can be used to realize the function of the processing circuit (it is not necessary to arrange a processing circuit dedicated to the inductive sensor 1).

[0070] For example, reference Figures 1 to 3 , along the first direction (i.e. Figure 1 The rotor end plate 101 and the second rotor end plate 22 in the inductive sensor 1 are respectively arranged on both sides of the six groups of silicon steel sheets 20 and connected to the silicon steel sheets 20. Figure 1 , 2 From the observation angle shown, the inductive sensor 1 is arranged on the upper side of the six groups of silicon steel sheets 20, and the second rotor end plate 22 is arranged on the lower side of the six groups of silicon steel sheets 20. However, the present application does not limit the positions of the rotor end plate 101 and the second rotor end plate 22 in the inductive sensor 1. The inductive sensor 1 may also be arranged on the lower side of the six groups of silicon steel sheets 20, and the second rotor end plate 22 may be arranged on the upper side of the six groups of silicon steel sheets 20. The second rotor end plate 22 may be a known end plate arranged at any one of the two ends of the iron core of the motor rotor. Any one of the rotor end plate 101 (i.e., the first rotor end plate) and the second rotor end plate 22 may have at least one of the functions of adjusting dynamic balance, protecting silicon steel sheets, tightening silicon steel sheets, etc.

[0071] For example, reference Figure 1 and Figure 2 The circuit board 11 is also provided with five circular holes 113 for connecting with the motor housing 21, wherein the circuit board 11 can be a PCB (Printed Circuit Board) or a FPC (Flexible Printed Circuit Board).

[0072] It should be noted that the present application does not limit the specific position of the circuit board 11. It can be connected to the motor housing 21 and relatively stationary with the motor stator (not shown) as shown in the embodiment of the present application, or it can be set on the motor stator (not shown), or set on a support (not shown) for holding / supporting the motor housing. It should be understood that although the term "motor housing" is used to describe the component marked as "21" in the accompanying drawings, the motor housing 21 described herein may not be a component that shields, covers or accommodates all or part of the motor body (including the stator and rotor), and may be a component separated from the motor body. For example, the motor housing 21 may belong to the housing, end cover, etc. of the electric drive system, or the motor housing 21 may belong to other components in the electric drive system that are different from the motor.

[0073] For example, continue to refer to Figure 1 and Figure 2 The motor housing 21 and the circuit board 11 are spaced apart along the first direction. The motor housing 21 includes five connecting rods 211 extending along the first direction. The connecting rods 211 correspond one-to-one to the five circular holes 113 on the circuit board 11 and are threadedly connected, so that the circuit board 11 is connected to the motor housing 21, which can ensure the stability of the circuit board 11.

[0074] It should be noted that the present application does not impose any restrictions on the specific number and specific positions of the circular holes 113 and the connecting rods 211, as long as the circular holes 113 and the connecting rods 211 can be connected to each other one-to-one. It can also be set to six circular holes 113 and six connecting rods 211 or four circular holes 113 and four connecting rods 211, etc.

[0075] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above contents are further detailed descriptions of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. An inductive sensor, characterized in that: include: A metal rotating part, the metal rotating part comprises a rotor end plate, a surface of the rotor end plate is provided with a plurality of metal induction parts, the plurality of metal induction parts are arranged rotationally symmetrically, the metal rotating part can rotate synchronously with the rotor of the motor, so that the rotor end plate rotates synchronously with the rotor; A circuit board is provided with an excitation coil and a receiving coil, and the circuit board is spaced apart from any one of the plurality of metal induction components.

2. The inductive sensor according to claim 1, characterized in that Along the first direction, a gap between the circuit board and any one of the plurality of metal sensing parts is 3 mm to 4.5 mm, and a thickness of the plurality of metal sensing parts is 4 mm to 8 mm.

3. The inductive sensor according to claim 1, characterized in that The rotor end plate is concavely provided with a receiving area, and the plurality of metal induction components are convexly provided in the receiving area.

4. The inductive sensor according to claim 1, characterized in that The plurality of metal induction components are integrally formed with the rotor end plate.

5. The inductive sensor according to claim 1, characterized in that: The number of the metal sensing parts is four.

6. The inductive sensor according to claim 1, characterized in that The rotor end plate also includes a connecting hole and a connecting member. The connecting hole penetrates the rotor end plate along a first direction for connecting a rotating shaft. The connecting member is protruded from the outer periphery of the connecting hole. The multiple metal sensing members are all connected to the connecting member and are rotationally symmetrically arranged relative to the connecting member.

7. The inductive sensor according to claim 1, characterized in that: Along the first direction, a projection of any one of the plurality of metal sensing components is a hollow sector ring.

8. The inductive sensor according to claim 1, wherein: The metal rotating member is provided with a plurality of weight-reducing holes, and the plurality of weight-reducing holes are arranged at intervals along the circumference of the metal rotating member.

9. An inductive sensor, characterized in that: include: A plurality of metal induction members, the plurality of metal induction members are formed on the rotor end plate so as to be able to rotate synchronously with the motor rotor, and the plurality of metal induction members are arranged rotationally symmetrically; A circuit board is provided with an excitation coil and a receiving coil for the plurality of metal induction components, and the circuit board is spaced apart from any one of the plurality of metal induction components.

10. A motor system, characterized in that: include: The rotor comprises a plurality of silicon steel sheets stacked along a first direction; A first rotor end plate and a second rotor end plate are respectively arranged at two ends of the rotor along the first direction and fixedly connected to the rotor, wherein one or more metal induction parts are arranged on the first rotor end plate; A circuit board is arranged separately from the rotor, and an excitation coil and a receiving coil are arranged on the circuit board so as to sense the position of the one or more metal induction members.

11. The motor system according to claim 10, characterized in that The circuit board is disposed on one side of the rotor close to the first rotor end plate along the first direction, and is spaced apart from the first rotor end plate.

12. The motor system according to claim 10, characterized in that The motor system further comprises a motor housing, and the circuit board is fixedly connected to the motor housing.

13. The motor system according to claim 10, characterized in that The motor system further includes a stator, and the circuit board is relatively stationary with respect to the stator.

14. The motor system according to claim 10, characterized in that The one or more metal induction components are integrally formed with the first rotor end plate.

15. The motor system according to claim 10, wherein: The number of the one or more metal induction components is plural, and the multiple metal induction components are evenly arranged along the circumferential direction of the first rotor end plate.

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