An electric motor and its position sensor

Abstract

The application discloses a motor and a motor position sensor thereof, and relates to the technical field of position sensors, which comprises a first induction assembly and a second induction assembly. The first induction assembly comprises a coil group, a control element and a rotor element. The control element is electrically connected with the coil group and controls the coil group to generate an excitation magnetic field. The rotor element cuts the excitation magnetic field, so that the coil group forms an induction magnetic field, and sine and cosine circuits generate induction signals. The control element receives the induction signals and generates sine and cosine voltage signals. The second induction assembly comprises an induction element and a trigger terminal. The induction element can periodically induce the trigger terminal and generate a zero position signal. According to the zero position signal and the induction signals, the motor position sensor can obtain the absolute position of a motor rotor. When the motor position sensor is assembled in the motor, the absolute position of the motor rotor can be obtained.

Description

Technical Field

[0001] This application relates to the field of position sensor technology, and in particular to a motor and a motor position sensor thereof. Background Technology

[0002] An internal position sensor in a motor is a device used to detect the position of the motor rotor (rotating part) relative to the stator (stationary part). By obtaining the mechanical position of the motor rotor through the position sensor, the motor controller can determine when to switch the direction and intensity of the motor current, thereby controlling the motor's rotational speed and torque.

[0003] In new energy vehicles, the precise control of the motor is related to the vehicle's driving safety and stability. The accurate operation of the position sensor can ensure that the motor responds correctly at critical moments such as emergency braking, acceleration or steering.

[0004] Eddy current sensors are currently the most common type of position sensor. However, most existing eddy current sensors suffer from being heavy or occupying a large area, which hinders the miniaturization of these products. Summary of the Invention

[0005] The purpose of this application is to provide a motor and a motor position sensor thereof, so as to accurately obtain the absolute position of the motor rotor and make the position sensor structure compact, thereby solving the problems of large weight or large area occupied by existing position sensors.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] A motor position sensor includes a first sensing component and a second sensing component, wherein,

[0008] The first sensing component includes a coil group, a control element, and a rotor element. The control element is electrically connected to the coil group and controls the coil group to generate an excitation magnetic field.

[0009] The rotor element rotates synchronously with the rotor of the motor to cut the excitation magnetic field, causing the coil group to generate an induced signal; the control element obtains the electrical angle of the motor rotor based on the induced signal.

[0010] The second sensing component includes a sensing element and a trigger terminal. The trigger terminal rotates synchronously with the rotor of the motor. The sensing element periodically senses the trigger terminal to generate a zero-position signal of the rotor of the motor.

[0011] In some embodiments, the coil group includes an excitation circuit, a sine circuit, and a cosine circuit; wherein the control element is electrically connected to the excitation circuit, the sine circuit, and the cosine circuit, and causes the excitation circuit to generate an excitation magnetic field; the rotor element rotates synchronously with the rotor of the motor to cut the excitation magnetic field, causing the sine circuit and the cosine circuit to generate induced signals; the control element obtains the electrical angle of the rotor of the motor based on the induced signals.

[0012] In some embodiments, the sensing element is arranged corresponding to the rotation path of the trigger terminal to periodically sense the trigger terminal and generate a zero-position signal of the motor rotor.

[0013] In some embodiments, the first sensing component includes a substrate, the coil array is disposed within the substrate, and the excitation circuit, the sine circuit, and the cosine circuit are arranged along the thickness direction of the substrate.

[0014] In some embodiments, the rotor element is arranged along the thickness direction on one side of the substrate and is rotatable relative to the substrate to cut the excitation magnetic field and form an induced magnetic field.

[0015] In some embodiments, there are multiple coil groups and multiple control elements, with each control element connected to a coil group in a one-to-one correspondence, so that the coil groups can operate independently.

[0016] In some embodiments, the first sensing component includes a substrate, and a plurality of coil groups are arranged sequentially and parallel to each other along the thickness direction of the substrate.

[0017] In some embodiments, the second sensing component is any one of a Hall sensor, an eddy current proximity switch, a capacitive proximity switch, or a photoelectric proximity switch.

[0018] Based on the aforementioned position sensor, this application also provides a motor, which includes a motor stator, a motor rotor, and the aforementioned position sensor, wherein...

[0019] The substrate, the control element, and the sensing element are fixed to the motor stator;

[0020] The trigger terminal and rotor element are connected to the motor rotor and rotate synchronously with the motor rotor.

[0021] In some embodiments, a substrate is also included, the substrate comprising a housing, the control element and the sensing element being disposed on the housing and oriented toward the motor rotor.

[0022] In some embodiments, the sensing element has a sensing end face protruding from the substrate in the direction toward the motor rotor, the sensing end face being parallel to the surface of the substrate facing the motor rotor, and a distance L, 3mm≤L≤45mm, between the sensing end face and the surface of the substrate facing the motor rotor.

[0023] In some embodiments, at least one of the motor stator and the motor rotor has a connecting portion extending toward the other; the substrate is an annular structure, the substrate has a through hole extending along the thickness direction of the substrate, the connecting portion passes through the through hole, so that the substrate is sleeved on the connecting portion; and the annular width of the substrate is W, 25mm≤W≤65mm.

[0024] In some embodiments, the sine circuit, the cosine circuit, and the excitation circuit of the first sensing component are arranged around the rotation axis of the motor rotor to form a circular path or an arc path.

[0025] In some embodiments, a motor controller is also included, which is used to control the movement of the motor rotor and is connected to the control element to supply power to the control element; and the motor controller is configured to:

[0026] Obtain the operating information of each of the control elements;

[0027] When the control element is working properly, the signal output of the control element is acquired, and the absolute position of the motor rotor is calculated.

[0028] If any of the control elements malfunctions, the acquisition of the signal output of the malfunctioning control element shall be stopped.

[0029] In some embodiments, there are multiple coil groups and multiple control elements, with each control element connected to a coil group in a one-to-one correspondence, so that the coil groups can operate independently; and, with one of the control elements as the main control element, when multiple control elements are operating normally, the signal output of the main control element is acquired to calculate the absolute position of the motor rotor.

[0030] Compared with the prior art, the advantages of the motor and its position sensor described in this application are as follows:

[0031] The motor and its position sensor of this application incorporate a first sensing component. The rotor element of the first sensing component cuts the excitation magnetic field generated by the excitation circuit, causing the rotor element to generate an induced magnetic field. This induced magnetic field opposes changes in the excitation magnetic field. The coil group detects the changes in the excitation magnetic field, thereby generating an induced signal. Furthermore, as the rotor element rotates, the amplitude of the induced signal changes accordingly. Thus, after receiving the induced signal, the control element can obtain the electrical angle amplitude of the motor rotor's rotation within a single time period. Additionally, the motor position sensor incorporates a second sensing component, causing the trigger terminal to rotate synchronously with the rotor element. The sensing element periodically senses the trigger terminal, generating a zero-position signal. Based on the zero-position signal, the absolute positions of the rotor element and the trigger terminal at the time the zero-position signal is triggered can be determined. Combined with the electrical angle amplitude of the motor rotor, the motor position sensor can accurately determine the absolute position of the motor rotor.

[0032] Furthermore, this motor and its position sensor arrange the excitation circuit, sine circuit, and cosine circuit in a printed circuit board, making the circuit layout more convenient. Moreover, the excitation circuit, sine circuit, and cosine circuit are arranged along the thickness direction, so that the area occupied by the coil group in the radial direction is always the area of ​​the substrate. In addition, even if multiple coil groups are stacked in this motor position sensor, the multiple coil groups are still arranged sequentially and parallel to each other along the thickness direction, and will not occupy more radial space. When this motor position sensor is applied to a motor, there is no need to reserve too much space between the motor stator and the motor rotor, which enables the motor to be further miniaturized.

[0033] Furthermore, by connecting multiple coil groups to multiple control elements one-to-one, with each control element supplying power to each coil group, the motor and its position sensor enable each coil group to operate independently. In this way, the motor position sensor can achieve redundant signal transmission by arranging multiple coil groups, improving the reliability of position recognition. Moreover, based on the independent operation of each coil group, even if one coil group malfunctions, it will not affect the normal operation of the other coil groups, thus ensuring the operational reliability of the motor position sensor. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the motor position sensor in this application;

[0035] Figure 2 This is a schematic diagram of the fixed part of the motor position sensor in this application;

[0036] Figure 3 This is a cross-sectional schematic diagram of the substrate of this application;

[0037] Figure 4 yes Figure 3 Enlarged view of A in the middle;

[0038] Figure 5 This is a schematic diagram showing the coil groups of this application arranged sequentially along the thickness direction;

[0039] Figure 6 This is a schematic diagram of the rotor element of this application;

[0040] Figure 7 This is a schematic diagram of the motor used in this application;

[0041] Figure 8 This is an exploded schematic diagram of the motor in this application;

[0042] Figure 9 This is a schematic diagram showing the connection between the coil assembly and the control element in this application;

[0043] Figure 10 This is a schematic diagram of the execution steps of the motor controller in this application.

[0044] In the diagram, 100 represents a position sensor; 200 represents a motor.

[0045] 1. First sensing component; 1a. Coil group; 11a. Excitation circuit; 12a. Sine circuit; 13a. Cosine circuit; 1b. Control element; 1c. Rotor element; 1d. Substrate; 10d. Through hole; 11d. Plate housing; 12d. Electrical connection part; 10c. Rotor body; 11c. Rotor blade; 2. Second sensing component; 2a. Sensing element; 20a. Sensing end face; 2b. Trigger terminal; 3. Motor stator; 3a. Stator housing; 30a. First end face; 31a. Coupling part; 4. Motor rotor; 5. Motor controller. Detailed Implementation

[0046] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application.

[0047] In the description of this application, it should be understood that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on or indirectly on that other element. When an element is referred to as being "connected to" another element, it can be directly connected to or indirectly connected to that other element. The terms "mounted," "connected," and "attached" should be interpreted broadly, for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements or the interaction between two elements. Those skilled in the art will understand the specific meaning of the above terms in this application according to the specific circumstances.

[0048] In the description of this application, it should be understood that the terms "height," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., used to indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings are used only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0049] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0050] like Figure 1-6 As shown in the illustration, a motor position sensor 100 according to an embodiment of this application is used to obtain the absolute position of a motor rotor 4. It includes a first sensing component 1 and a second sensing component 2. The first sensing component 1 is used to obtain the rotation angle of the rotating component within a time period, and the second sensing component 2 is used to obtain the zero position of the rotating component and the time taken to reach the zero position. After the motor position sensor 100 is assembled into the motor 200, the rotating component can be the motor rotor 4.

[0051] The first sensing component 1 includes a coil group 1a, a control element 1b, and a rotor element 1c. The control element 1b is electrically connected to the coil group 1a and controls the coil group 1a to generate an excitation magnetic field. The rotor element 1c rotates synchronously with the motor rotor 4 to cut the excitation magnetic field and form an induced magnetic field, causing the coil group 1a to generate an induced signal. Furthermore, the control element 1b can receive the induced signal and obtain the electrical angle of the motor rotor 4.

[0052] When power is applied to the excitation circuit 11a, it generates an alternating excitation magnetic field. The rotor element 1c cuts the excitation magnetic field, generating eddy current induction, which in turn generates an induced magnetic field. This induced magnetic field opposes the change in the excitation magnetic field, and the coil group 1a can detect this magnetic field change, thereby generating an induced signal. The rotor element 1c rotates synchronously with the motor rotor 4 and also rotates periodically relative to the coil group 1a, thereby causing the signal amplitude of the induced signal to change periodically.

[0053] Control element 1b receives the induced signal, processes it, and obtains a voltage signal that meets the control requirements. Within one rotation cycle of rotor element 1c, control element 1b can output voltage signals for multiple cycles and determine the electrical angle of motor rotor 4 based on the voltage signals.

[0054] The coil group 1a can have various arrangement structures. As long as the coil group 1a can generate an excitation magnetic field and produce an induced signal, it can be adapted to the control element 1b to obtain the electrical angle of the motor rotor 4. As an example of this embodiment, the coil group 1a may include an excitation circuit 11a, a sine circuit 12a, and a cosine circuit 13a. The control element 1b is connected to the excitation circuit 11a, the sine circuit 12a, and the cosine circuit 13a, and the control element 1b is configured to enable the excitation circuit 11a to generate an excitation magnetic field.

[0055] Generally, coil group 1a can be arranged within substrate 1d, and excitation circuit 11a, sine circuit 12a, and cosine circuit 13a can be printed along the thickness direction of substrate 1d. Substrate 1d can be configured using a PCB circuit board. If the PCB circuit board adopts a multi-layer layout, multiple layout planes are arranged inside the PCB circuit board. The multiple layout planes are arranged parallel to each other along the thickness direction of the PCB circuit board, and excitation circuit 11a, sine circuit 12a, and cosine circuit 13a are printed on the multiple layout planes, thereby forming coil group 1a.

[0056] It is understandable that the excitation circuit 11a, the sine circuit 12a, and the cosine circuit 13a do not have a specific arrangement order in the thickness direction of the substrate 1d. The excitation circuit 11a, the sine circuit 12a, and the cosine circuit 13a can be adopted... Figure 3-5 The arrangement sequence of excitation circuit 11a-sine circuit 12a-cosine circuit 13a shown can also be other sequences, such as excitation circuit 11a-cosine circuit 13a-sine circuit 12a, or sine circuit 12a-cosine circuit 13a-excitation circuit 11a, etc.

[0057] The rotor element 1c rotates synchronously with the rotor of the motor to cut the excitation magnetic field and form an induced magnetic field; the sine circuit 12a and the cosine circuit 13a can generate induced signals based on the excitation magnetic field and the induced magnetic field; and the control element 1b can receive the induced signals to generate sine voltage signals and cosine voltage signals.

[0058] When power is applied to the excitation circuit 11a, it generates an alternating excitation magnetic field. The rotor element 1c cuts the excitation magnetic field, generating eddy current induction, which in turn produces an induced magnetic field. This induced magnetic field hinders the change in the excitation magnetic field, and the sine circuit 12a and cosine circuit 13a can detect this magnetic field change, thereby generating induced signals, namely, a sinusoidal induced voltage signal and a cosine induced voltage signal. The rotor element 1c rotates relative to the substrate 1d and also rotates periodically relative to the coil group 1a, thereby causing the signal amplitudes of the sinusoidal and cosine induced voltage signals to change periodically.

[0059] Control element 1b receives sinusoidal and cosine induced voltage signals, processes them to obtain sinusoidal and cosine voltage signals that meet control requirements. Within one rotation cycle of rotor element 1c, control element 1b can output multiple cycles of sinusoidal and cosine voltage signals. By calculating the arctangent function, the rotation angle of rotor element 1c can be determined from the sinusoidal and cosine voltage signals.

[0060] It is understood that the rotor element 1c is arranged along the thickness direction of the substrate 1d on one side of the substrate 1d and is capable of rotating relative to the substrate 1d. It is generally arranged along the thickness direction of the coil group 1a, opposite to the coil group 1a, to cut the excitation magnetic field. Specifically, the rotor element 1c may include a rotor body 10c, which is a columnar structure, and one end of the rotor body 10c is positioned opposite to the coil group 1a in its axial direction. Multiple rotor blades 11c are arranged on the outer periphery of the rotor body 10c. When the rotor body 10c is driven to rotate relative to the coil group 1a, the rotor blades 11c cut the excitation magnetic field, generating eddy current induction, and thus generating an induced magnetic field.

[0061] It is understandable that the control element 1b can be an eddy current chip. The eddy current chip is connected to an external controller or external power supply via leads, so that the external controller or external power supply can independently supply power to the coil group 1a through the eddy current chip.

[0062] refer to Figure 1-2 The motor position sensor 100 in this embodiment also includes a second sensing component 2. The second sensing component 2 includes a sensing element 2a and a trigger terminal 2b. The trigger terminal 2b can rotate synchronously with the rotor element 1c. The sensing element 2a periodically senses the trigger terminal 2b to generate a zero position signal.

[0063] The sensing element 2a can periodically sense the trigger terminal 2b by being arranged in a manner corresponding to the rotation path of the trigger terminal 2b, or by other periodic triggering methods. For example, in the manner in which the sensing element 2a is arranged in a manner corresponding to the rotation path of the trigger terminal 2b, as the rotor element 1c rotates, the trigger terminal 2b will periodically pass through the position of the sensing element 2a. In this way, the motor position sensor 100 can indicate the current position of the rotor element 1c based on the zero position signal generated by the sensing element 2a.

[0064] Taking a Hall sensor as an example, the trigger terminal 2b is the sensing pin of the Hall sensor, which is generally cylindrical to maintain the consistency of the sensing signal. The sensing element 2a consists of an excitation permanent magnet and a Hall chip. The Hall chip is located at the end of the excitation permanent magnet and faces the sensing pin. The sensing pin rotates synchronously with the rotor element 1c, periodically passing the excitation permanent magnet and the Hall chip. When the sensing pin rotates to the position of the Hall chip, it is in an overlapping state; when the sensing pin leaves the position of the Hall chip, it is in a non-overlapping state. The magnetic field state formed by the excitation permanent magnet is different in the overlapping and non-overlapping states. The Hall chip can detect this change in magnetic field state and convert it into a voltage signal. For example, when the sensing pin rotates to the position of the Hall chip, the voltage signal output by the Hall chip changes from a high-level signal to a low-level signal. Thus, the rising or falling edge of the voltage signal change can be used as a basis for judgment.

[0065] Therefore, the mechanical zero position of the motor position sensor 100 is taken as the state in which the sensing pin and the Hall chip are in an overlapping state. When the rotor element 1c rotates, the rotation cycle is defined as the state in which the sensing pin and the Hall chip are in an overlapping state again. The starting point and ending point of the rotation of the rotor element 1c within one rotation cycle can be determined. Combined with the rotation angle of the rotor element 1c obtained from the sine voltage signal and the cosine voltage signal, the motor position sensor 100 can confirm the rotation angle of the rotor element 1c relative to the Hall chip within one rotation cycle, thereby determining the absolute position of the rotor element 1c within one rotation cycle.

[0066] Of course, the second sensing component 2 does not necessarily have to be a Hall sensor. Depending on the usage requirements of the motor position sensor 100, the second sensing component 2 can be any one of a Hall sensor, an eddy current proximity switch, a capacitive proximity switch, or a photoelectric proximity switch.

[0067] refer to Figure 9 As an example of this embodiment, there are multiple coil groups 1a and multiple control elements 1b. The control elements 1b are connected to the coil groups 1a in a one-to-one correspondence so that the coil groups 1a can operate independently.

[0068] By increasing the number of coil groups 1a and control elements 1b, the motor position sensor 100 can achieve signal redundancy. Multiple coil groups 1a and control elements 1b independently output signals as the basis for determining the position of the rotor element 1c. Moreover, multiple coil groups 1a operate independently. When one coil group 1a fails, the control element 1b corresponding to that coil group 1a can shut down its signal output, while the other coil groups 1a and their corresponding control elements 1b continue to output signals normally, ensuring the normal operation of the motor position sensor 100.

[0069] refer to Figure 5 As an example of this embodiment, multiple coil groups 1a are arranged sequentially and parallel to each other along the thickness direction of the substrate 1d. In this way, when the motor position sensor 100 adopts the signal redundancy function, the coil groups 1a will not increase the radial area of ​​the motor position sensor 100, so that the motor position sensor 100 can be adapted to the motor 200 with limited inner and outer diameter space.

[0070] It is understandable that adding coil group 1a does not increase the number of substrates 1d, and multiple coil groups 1a are formed inside the same substrate 1d. Depending on the application requirements, the motor position sensor 100 can divide the substrate 1d into a suitable number of layout planes, and form a group of three layout planes. By printing excitation circuit 11a, sine circuit 12a and cosine circuit 13a on the three layout planes respectively, the required number of coil groups 1a can be formed.

[0071] Based on the aforementioned motor position sensor 100, refer to Figure 7-10 This application also provides a motor 200, which includes a motor stator 3, a motor rotor 4 and the aforementioned motor position sensor 100. The stator housing 3a of the motor stator 3 has a first end face 30a perpendicular to the rotation axis of the motor 200. The substrate 1d, the control element 1b and the sensing element 2a are connected to the first end face 30a and are fixed to the motor stator 3. The trigger terminal 2b and the rotor element 1c are connected to the motor rotor 4 and rotate synchronously with the motor rotor 4.

[0072] It is understandable that the base plate 1d, control element 1b and sensing element 2a are generally fixed on the stator housing 3a of the motor stator 3, and the trigger terminal 2b and rotor element 1c are generally connected to the rotor housing of the motor rotor 4, so as to avoid interfering with the normal operation between the windings of the motor stator 3 and the windings of the motor rotor 4.

[0073] refer to Figure 8In this embodiment, the stator housing 3a of the motor stator 3 also has a connecting shaft portion 31a extending toward the motor rotor 4. Specifically, one end of the connecting shaft portion 31a is connected to the first end face 30a, and the other end extends toward the side where the motor rotor 4 is located. Furthermore, the extending direction of the connecting shaft portion 31a is parallel to the rotation axis of the motor rotor 4. Moreover, in order to facilitate the assembly of this motor position sensor 100, the coil group 1a can be arranged at the end of the connecting shaft portion 31a or sleeved on the connecting shaft portion 31a, so that the thickness direction of the coil group 1a is parallel to the direction of the rotation axis of the motor rotor 4.

[0074] When the motor rotor 4 rotates relative to the motor stator 3, the motor rotor 4 drives the rotor element 1c and the trigger terminal 2b to rotate synchronously. Thus, the rotor element 1c and the trigger terminal 2b can rotate relative to the motor stator 3. After the excitation circuit 11a generates an alternating excitation magnetic field, the rotor element 1c rotates with the motor rotor 4 to cut the excitation magnetic field, generating eddy current induction, and subsequently generating an induced magnetic field. The sine circuit 12a and the cosine circuit 13a then correspondingly generate induced signals, namely, a sinusoidal induced voltage signal and a cosine induced voltage signal. Because the motor rotor 4 rotates periodically relative to the motor stator 3, the rotor element 1c also rotates periodically relative to the coil group 1a, causing the signal amplitudes of the sinusoidal and cosine induced voltage signals to change periodically.

[0075] The sensing element 2a is arranged along the rotation path corresponding to the trigger terminal 2b. As the rotor element 1c rotates, the trigger terminal 2b periodically passes the position of the sensing element 2a. When the trigger terminal 2b passes the position of the sensing element 2a, the sensing element 2a generates a zero-position signal, indicating that the rotor element 1c has rotated to the position of the sensing element 2a. Since the trigger terminal 2b and the rotor element 1c are fixedly connected to the motor rotor 4, within one rotation cycle of the motor rotor 4, the starting point of the rotation cycle is when the trigger terminal 2b reaches the position of the sensing element 2a, and the ending point is when the trigger terminal 2b reaches the position of the sensing element 2a again. In this way, by combining the rotation angle of the rotor element 1c obtained from the sine and cosine voltage signals, the motor position sensor 100 can determine the absolute position of the motor rotor 4 within one rotation cycle.

[0076] It is understandable that when rotor element 1c is driven to rotate by motor rotor 4, the rotation path of rotor element 1c is a complete circle. Therefore, correspondingly, the sine circuit 12a, cosine circuit 13a, and excitation circuit 11a of coil group 1a can be arranged around the rotation axis of motor rotor 4 to form a circular path arrangement, so that when rotor element 1c rotates, the sine circuit 12a, cosine circuit 13a, and excitation circuit 11a of coil group 1a can all play their respective roles, ensuring the accuracy of the motor position sensor 100. Of course, the arrangement of sine circuit 12a, cosine circuit 13a, and excitation circuit 11a can also be varied according to the position accuracy requirements. For example, the sine circuit 12a, cosine circuit 13a, and excitation circuit 11a can also be arranged around the rotation axis of motor rotor 4 to form an arc-shaped path.

[0077] refer to Figure 7-10 As an example of this embodiment, the substrate 1d includes a plate housing 11d, which is fixedly connected to the first end face 30a of the motor stator 3; the control element 1b and the sensing element 2a are arranged on the plate housing 11d and are arranged toward the motor rotor 4.

[0078] By setting the substrate 1d, the coil group 1a, the control element 1b and the sensing element 2a can be integrated into the substrate 1d. By encapsulating the whole with potting compound, the structural strength of the motor position sensor 100 is improved. Moreover, multiple coil groups 1a can be integrated into the same substrate 1d to realize the signal redundancy function of the motor position sensor 100 and make the structure of the motor position sensor 100 compact.

[0079] To facilitate the arrangement of the motor position sensor 100 and ensure a compact fit between the motor stator 3 and motor rotor 4 of the motor 200 using the motor position sensor 100, refer to... Figure 1 As an example of this embodiment, the sensing element 2a, such as a Hall effect chip, has a sensing end face 20a protruding from the substrate 1d. The sensing end face 20a is parallel to the substrate 1d, and there is a distance L between the sensing end face and the substrate 1d, where 3mm ≤ L ≤ 45mm. More preferably, 15mm ≤ L ≤ 35mm.

[0080] Furthermore, refer to Figure 2 , 8As an example of this embodiment, the motor stator 3 has a connecting portion 31a extending toward the motor rotor 4; the substrate 1d has an annular structure and a through hole 10d extending along its thickness direction. The connecting portion 31a passes through the through hole 10d, so that the substrate 1d is fitted onto the connecting portion 31a; and the annular width of the substrate 1d is W, 25mm≤W≤65mm, so that the size of the substrate 1d can take into account the accuracy and weight reduction requirements of the control element 1b. More preferably, 30≤W≤50mm. In addition, as an example of this embodiment, the plate housing 11d can extend radially outward along the through hole 10d to form an electrical connection portion 12d. The electrical connection portion 12d is arranged on the outer periphery of the substrate 1d, and the control element 1b and the sensing element 2a are arranged in the electrical connection portion 12d to ensure that when the rotor element 1c rotates relative to the substrate 1d, it will not interfere with the control element 1b and the sensing element 2a. Furthermore, this facilitates the wiring between the control element 1b and the coil group 1a.

[0081] As an example of this embodiment, the motor 200 further includes a motor controller 5, which controls the movement of the motor rotor 4 and is electrically connected to the control element 1b to supply power to the control element 1b; and the motor controller 5 is configured to perform the following steps:

[0082] S1. Obtain the power supply information of each control element 1b;

[0083] S2. When the control element 1b is working normally, obtain the signal output of the control element 1b and calculate the absolute position of the motor rotor 4.

[0084] S3. When any control element 1b is malfunctioning, shut down the signal output of the malfunctioning control element 1b and stop acquiring the signal output of the malfunctioning control element 1b.

[0085] It is understandable that the state of control element 1b, whether it is operating normally or abnormally, can be set according to the parameters of control element 1b, such as the operating voltage or the amplitude of the feedback signal. By setting the motor controller 5, the motor 200 of this embodiment can monitor the operating status of each control element 1b, for example, referring to... Figure 10The motor controller 5 can acquire the signal output of the control element 1b when it is operating normally, and stop acquiring the signal output of the control element 1b when it is experiencing a power supply abnormality, based on the power supply status of the control element 1b. When a control element 1b experiences a power supply abnormality, it can perform self-diagnosis and implement corresponding strategies, such as shutting down its own signal output, so that the motor controller 5 can always acquire the signal output of the normally operating control element 1b. This allows the motor position sensor 100 to more reliably confirm the absolute position of the motor rotor 4. Of course, when multiple control elements 1b are configured, the motor controller 5 only needs to use the signal output of one control element 1b as the basis for calculation. For example, the motor position sensor 100 can use one control element 1b as the main control element. In this case, when multiple control elements 1b are operating normally, the motor controller 5 acquires the signal output of the main control element and calculates the absolute position of the motor rotor 4.

[0086] In summary, this application provides a motor position sensor 100 and a motor 200. By setting a first sensing component 1, the rotor element 1c of the first sensing component 1 can cut the excitation magnetic field generated by the excitation circuit 11a, causing the rotor element 1c to generate an induced magnetic field. The induced magnetic field will hinder the change of the excitation magnetic field. The sine circuit 12a and cosine circuit 13a detect the change of the excitation magnetic field and generate an induced signal. As the rotor element 1c rotates, the signal amplitude of the induced signal will also change accordingly. In this way, the control element 1b receives the induced signal and generates a sine voltage signal and a cosine voltage signal, which can provide feedback on the angular amplitude of the rotor element 1c's rotation within a single time period. Furthermore, by setting a second sensing component 2, the motor position sensor 100 causes the trigger terminal 2b to rotate synchronously with the rotor element 1c. In this way, when the control element 1b generates the sine voltage signal and the cosine voltage signal, the sensing element 2a also periodically senses with the trigger terminal 2b to generate a zero position signal. Based on the zero-position signal, the absolute positions of rotor element 1c and trigger terminal 2b when the zero-position signal is triggered can be determined. Combining the angular amplitude of rotor element 1c fed back by the sine and cosine voltage signals, the motor position sensor 100 can acquire the absolute positions of rotor element 1c and trigger terminal 2b. After assembling the motor position sensor 100 into the motor 200, the absolute position of the motor rotor 4 can be obtained through the motor position sensor 100.

[0087] Furthermore, the excitation circuit 11a, sine circuit 12a, and cosine circuit 13a of this motor position sensor 100 are arranged in a printed manner on the substrate 1d, making the circuit layout more convenient. Moreover, the excitation circuit 11a, sine circuit 12a, and cosine circuit 13a are arranged parallel to each other along the thickness direction, so that the excitation circuit 11a, sine circuit 12a, and cosine circuit 13a of a single coil group 1a are stacked together along the thickness direction. The area occupied by the coil group 1a in the radial direction is always the area of ​​a single substrate 1d. Furthermore, even if multiple coil groups 1a are stacked in this motor position sensor 100, the multiple coil groups 1a are still arranged sequentially and parallel to each other along the thickness direction, and will not occupy more radial space. Therefore, when this motor position sensor 100 is applied to the motor 200, there is no need to reserve too much space between the motor stator 3 and the motor rotor 4, which allows the motor 200 to be further miniaturized.

[0088] Furthermore, by connecting multiple coil groups 1a to multiple control elements 1b in a one-to-one correspondence, with each control element 1b supplying electrical energy to each coil group 1a, the motor position sensor 100 enables each coil group 1a to operate independently. In this way, the motor position sensor 100 can achieve signal redundancy transmission by arranging multiple coil groups 1a, thereby improving the reliability of the position recognition of the motor position sensor 100. Moreover, based on the setting of independent operation of each coil group 1a, even if one coil group 1a operates abnormally, it will not affect the normal operation of the other coil groups 1a, thus ensuring the operational reliability of the motor position sensor 100.

[0089] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this application, and these improvements and substitutions should also be considered within the scope of protection of this application.

Claims

1. An electrical machine position sensor, characterized by The first induction assembly and the second induction assembly are included, wherein, The first induction assembly includes a coil group, a control element and a rotor element, the control element is electrically connected with the coil group and controls the coil group to generate an excitation magnetic field; The rotor element rotates synchronously with the rotor of the motor to cut the excitation magnetic field, so that the coil group generates an induction signal; the control element acquires the electrical angle of the rotor of the motor based on the induction signal; The second induction assembly includes an induction element and a trigger terminal, the trigger terminal rotates synchronously with the rotor of the motor, the induction element periodically induces the trigger terminal to generate a zero position signal of the rotor of the motor; and The number of the coil groups is multiple, multiple coil groups can independently operate, and the coil group includes an excitation circuit, a sine circuit and a cosine circuit; wherein the control element is electrically connected with the excitation circuit, the sine circuit and the cosine circuit, and the excitation circuit generates an excitation magnetic field; the rotor element rotates synchronously with the rotor of the motor to cut the excitation magnetic field, so that the sine circuit and the cosine circuit generate an induction signal; the control element acquires the electrical angle of the rotor of the motor based on the induction signal.

2. The motor position sensor of claim 1, wherein, The induction element is arranged corresponding to the rotation path of the trigger terminal to periodically induce the trigger terminal to generate a zero position signal of the rotor of the motor.

3. The motor position sensor of claim 1, wherein, The first induction assembly includes a substrate, the coil group is arranged in the substrate, and the excitation circuit, the sine circuit and the cosine circuit are arranged along the thickness direction of the substrate.

4. The motor position sensor of claim 3, wherein, The rotor element is arranged on one side of the substrate along the thickness direction and can rotate relative to the substrate to cut the excitation magnetic field and form an induction magnetic field.

5. The motor position sensor of claim 1, wherein, The number of the control elements is multiple, and the control elements are connected one by one with the coil groups to enable the coil groups to independently operate.

6. The motor position sensor of claim 1, wherein, The first induction assembly includes a substrate, multiple coil groups are arranged in sequence and parallel along the thickness direction of the substrate.

7. An electric machine characterized by The motor stator, the motor rotor and the motor position sensor of any one of claims 1-6 are included, wherein, The control element and the induction element are fixed on the motor stator; The trigger terminal and the rotor element are connected to the motor rotor and rotate synchronously with the motor rotor.

8. The electric machine of claim 7, wherein, The first induction assembly includes a substrate, the substrate is fixed on the motor stator, and the substrate includes a plate shell, the control element and the induction element are arranged on the plate shell and arranged towards the motor rotor.

9. The electric machine of claim 8, wherein, The induction element has an induction end surface protruding from the substrate towards the motor rotor, the induction end surface is parallel to the surface of the substrate towards the motor rotor, and the induction end surface and the surface of the substrate towards the motor rotor have a spacing L, 3mm≤L≤45mm.

10. The electric machine of claim 8, wherein, At least one of the motor stator and the motor rotor has a shaft connecting portion extending towards the other; the substrate has a ring structure, and has a through hole penetrating through the thickness of the substrate, the shaft connecting portion is arranged in the through hole, and the substrate is sleeved on the shaft connecting portion; and the ring width of the substrate is W, 25mm≤W≤65mm.

11. The electric machine of claim 8, wherein, The substrate has a ring structure, and has a through hole penetrating through the thickness of the substrate; the shell body extends outward along the radial direction of the through hole to form an electrical connection portion, the electrical connection portion is arranged on the outer periphery of the substrate, and the control element and the sensing element are arranged in the electrical connection portion.

12. The electric machine of claim 7, wherein, The coil group includes an excitation circuit, a sine circuit and a cosine circuit, and the sine circuit, the cosine circuit and the excitation circuit of the coil group are arranged around the rotation axis of the motor rotor to form a circular path or an arc path.

13. The electric machine of claim 7, wherein, The motor controller is further included, and is configured to control the action of the motor rotor and supply power to the control element; and the motor controller is configured to: obtain the working information of each control element; in the case that the control element is in normal working condition, obtain the signal output of the control element, and calculate the absolute position of the motor rotor; in the case that any control element is in abnormal working condition, stop obtaining the signal output of the control element in abnormal working condition.

14. The electric machine of claim 7, wherein, The number of coil groups is multiple, and the number of control elements is multiple, the control elements are connected with the coil groups one by one to make the coil groups run independently; and one of the control elements is a main control element, in the case that multiple control elements are in normal working condition, the signal output of the main control element is obtained, and the absolute position of the motor rotor is calculated.

Images