Position detection device, motor, suspension system and vehicle

Abstract

The utility model discloses a position detection device, a motor, a suspension system and a vehicle, and relates to the technical field of motors. The position detection device comprises a magnetic mechanism and a sensing mechanism, the magnetic mechanism is configured to be arranged on one of the rotor and the stator, and the magnetic mechanism comprises a first magnetic encoder; the sensing mechanism is configured to be arranged on the other one of the mover and the stator, the sensing mechanism comprises a first magnetic sensor pair, the first magnetic sensor pair corresponds to the first magnetic encoder and is configured to output two groups of differential signals in the orthogonal direction when the mover moves relative to the stator, and the first magnetic sensor pair corresponds to the second magnetic encoder and is configured to output two groups of differential signals in the orthogonal direction when the mover moves relative to the stator. Therefore, the moving distance of the mover relative to the stator is determined. The first magnetic sensor pair is configured to output the two groups of differential signals in the orthogonal direction to determine the moving distance of the rotor relative to the stator, so that the first magnetic sensor pair can directly output the two groups of differential signals in the orthogonal direction, the size of the position detection device is reduced, and the occupied space is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, and in particular to a position detection device, an electric machine, a suspension system and a vehicle. BACKGROUND

[0002] An electric machine is usually configured with a position detection device to detect position and speed information of the electric machine. In the related art, the position detection device includes two position sensors and a magnetic encoder. The magnetic encoder is arranged on a moving part of the electric machine, and the position sensors are arranged on a stationary part of the electric machine. The two position sensors detect single-ended outputs of magnetic field signals of the magnetic encoder in two orthogonal directions, respectively, and convert the single-ended input signals into differential signals through a single-to-differential signal chip, respectively. This results in a large overall volume of the position detection device and a large space occupation. SUMMARY

[0003] Embodiments of the present application provide a position detection device, an electric machine, a suspension system and a vehicle to reduce the volume of the position detection device and reduce space occupation.

[0004] To achieve the above object, according to a first aspect of the present application, a position detection device is provided, comprising a magnetic mechanism and a sensing mechanism. The magnetic mechanism is configured to be arranged on one of a mover and a stator. The magnetic mechanism comprises a first magnetic encoder. The sensing mechanism is configured to be arranged on the other one of the mover and the stator. The sensing mechanism comprises a first magnetic sensor pair corresponding to the first magnetic encoder. The first magnetic sensor pair is configured to output two sets of differential signals in orthogonal directions when the mover moves relative to the stator, to determine a moving distance of the mover relative to the stator.

[0005] In a possible implementation, the first magnetic sensor pair comprises a first magnetic sensor and a second magnetic sensor arranged at intervals. The first magnetic sensor and the second magnetic sensor are both configured to sense two magnetic field signals of the first magnetic encoder in orthogonal directions.

[0006] In a possible implementation, the first magnetic encoder is a linear magnetic encoder.

[0007] In a possible implementation, the first magnetic encoder comprises heteropolar magnetic poles arranged alternately. Two adjacent heteropolar magnetic poles define a first magnetic pole pair. A width of the first magnetic pole pair is L1. An interval between the first magnetic sensor and the second magnetic sensor is NL1+L1 / 2, where N is a natural number.

[0008] In a possible implementation, L1 satisfies: 10mm≤L1≤30mm.

[0009] In a possible implementation, the first magnetic sensor and the second magnetic sensor are both 3D magnetic sensors.

[0010] In a possible implementation, the sensing mechanism further comprises a processor, the first magnetic sensor and the second magnetic sensor are both signal-connected to the processor, and the processor is configured to determine the moving distance of the mover relative to the stator based on the differential signals.

[0011] In a possible implementation, the magnetic mechanism further comprises a second magnetic encoder, the second magnetic encoder is arranged in parallel with the first magnetic encoder, and a magnetic pole pair of the second magnetic encoder is arranged in a staggered manner with a magnetic pole pair of the first magnetic encoder; the sensing mechanism further comprises a second magnetic sensor pair, the second magnetic sensor pair is arranged in correspondence with the second magnetic encoder, and is configured to output differential signals in two orthogonal directions when the mover moves relative to the stator, so as to determine the moving distance of the mover relative to the stator.

[0012] In a possible implementation, the width of the magnetic pole pair of the second magnetic encoder is not equal to the width of the magnetic pole pair of the first magnetic encoder.

[0013] In a possible implementation, the second magnetic sensor pair comprises a third magnetic sensor and a fourth magnetic sensor arranged in a spaced manner, and the third magnetic sensor and the fourth magnetic sensor are both configured to sense two magnetic field signals in orthogonal directions of the second magnetic encoder.

[0014] In a possible implementation, the third magnetic sensor and the fourth magnetic sensor are both 3D magnetic sensors.

[0015] In a possible implementation, the second magnetic encoder is a linear magnetic encoder.

[0016] In a possible implementation, the second magnetic encoder comprises alternatingly arranged magnetic poles of different types, two adjacent magnetic poles of different types define a second magnetic pole pair, the width of the second magnetic pole pair is L2, and the spacing between the third magnetic sensor and the fourth magnetic sensor is M L2+L2 / 2, where M is a natural number.

[0017] According to a second aspect of the present application, there is provided an electric machine comprising the position detection device provided in the first aspect.

[0018] In a possible implementation, the electric machine comprises a center rod and a shell, the magnetic mechanism is arranged in the center rod, the sensing mechanism is arranged in the shell, the center rod is the mover, and the shell is the stator.

[0019] According to a third aspect of the present application, a suspension system is provided, comprising the motor provided in the second aspect.

[0020] According to a fourth aspect of the present application, a vehicle is provided, comprising the position detection device provided in the first aspect; or the motor provided in the second aspect; or the suspension system provided in the third aspect.

[0021] In the position detection device provided in the embodiments of the present application, the first magnetic sensor pair is configured to output two sets of differential signals in orthogonal directions when the mover moves relative to the stator, so as to determine the moving distance of the mover relative to the stator. Compared with the way of converting a single-ended input signal into a differential signal through a single-ended-to-differential signal chip, the first magnetic sensor pair can directly output two sets of differential signals in orthogonal directions, which helps to reduce the volume of the position detection device, reduce the space occupation, and facilitate the miniaturization design of the position detection device.

[0022] Other features and advantages of the present application will be described in detail in the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0024] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0025] Figure 1 The overall structure schematic diagram of the motor provided in the embodiments of the present application is shown in the figure;

[0026] Figure 2 The structure schematic diagram of the position detection device provided in the embodiments of the present application is shown in the figure;

[0027] Figure 3 The structure schematic diagram of the sensing mechanism provided in the embodiments of the present application is shown in the figure;

[0028] Figure 4 The position schematic diagram of the first magnetic encoder and the first magnetic pole pair provided in the embodiments of the present application is shown in the figure;

[0029] Figure 5 The position schematic diagram of the second magnetic encoder and the second magnetic pole pair provided in the embodiments of the present application is shown in the figure;

[0030] Figure 6 In the first magnetic sensor pair provided in the embodiments of the present application, the magnetic field component at the sensitive center of the two magnetic sensors is shown in the figure;

[0031] Figure 7 A schematic diagram of the sensing mechanism provided by the embodiment of the present application eliminating common-mode interference;

[0032] Figure 8 A schematic diagram of the electrical connection between the sensing mechanism provided by the embodiment of the present application and the processor.

[0033] Legend of reference signs:

[0034] 100 - motor; 20 - mover; 30 - stator; 40 - fork arm; 10 - position detection device; 11 - magnetic mechanism; 111 - first magnetic encoder; 112 - first magnetic pole pair; 113 - second magnetic encoder; 114 - second magnetic pole pair; 12 - sensing mechanism; 13 - circuit board; 14 - first magnetic sensor pair; 141 - first magnetic sensor; 142 - second magnetic sensor; 15 - second magnetic sensor pair; 151 - third magnetic sensor; 152 - fourth magnetic sensor; 16 - processor. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort belong to the protection scope of the present application.

[0036] According to a first aspect of the present application, a position detection device 10 is provided, referring to Figure 1 , Figure 1 The relevant structure of the motor 100 to which the position detection device 10 provided by the embodiment of the present application is applied, referring to Figure 1 , Figure 1 The overall structure of the motor 100 provided by the embodiment of the present application is schematically shown, for example, the motor 100 is a linear motor, the motor 100 includes a center rod and a shell, the center rod is connected to a fork arm 40 at one end, the fork arm 40 is used to connect a workpiece to drive the workpiece to make linear reciprocating motion, and the position detection device 10 can be used to determine the moving distance of the center rod relative to the shell to determine the position of the center rod.

[0037] Referring to Figure 2 and in combination with referring to Figure 1 , Figure 2 The structure of the position detection device 10 provided by the embodiment of the present application is schematically shown, the position detection device 10 includes a magnetic mechanism 11 and a sensing mechanism 12.

[0038] The magnetic mechanism 11 is configured to be arranged on one of the mover 20 and the stator 30, and the sensing mechanism 12 is configured to be arranged on the other one of the mover 20 and the stator 30.

[0039] It can be understood that the mover 20 is a moving part, and the stator 30 is a stationary part. Exemplarily, the mover 20 is a center rod of the motor 100, and the stator 30 is a housing of the motor 100.

[0040] In an example, the magnetic mechanism 11 is arranged on the center rod, and the sensing mechanism 12 is arranged on the housing. The magnetic mechanism 11 can be arranged in the center rod and move linearly with the center rod, and the sensing mechanism 12 can be connected to the housing by a threaded member and remain relatively fixed with the housing.

[0041] The magnetic mechanism 11 includes a first magnetic encoder 111, and the sensing mechanism 12 includes a first magnetic sensor pair 14. The first magnetic sensor pair 14 is configured to sense a magnetic field signal of the first magnetic encoder 111 and output two sets of differential signals in orthogonal directions when the mover 20 moves relative to the stator 30, so as to determine a moving distance of the mover 20 relative to the stator 30.

[0042] It can be understood that the first magnetic encoder 111 generates a magnetic field along the thickness direction of the first magnetic encoder 111. The sensing mechanism 12 is at a fixed distance from the first magnetic encoder 111. When the mover 20 moves, the position of the mover 20 relative to the stator 30 changes, and the position of the first magnetic encoder 111 relative to the first magnetic sensor pair 14 changes. The first magnetic sensor pair 14 can sense the changes in the magnetic field strength and direction of the first magnetic encoder 111 and convert the sensed magnetic field signal into an analog signal. The change rule of the analog signal corresponds to the change of the magnetic field of the first magnetic encoder 111. The analog signal can be a voltage signal or a current signal.

[0043] It can be understood that the first magnetic sensor pair 14 includes two magnetic sensors arranged at intervals. Each magnetic sensor can sense two magnetic field signals in orthogonal directions of the first magnetic encoder 111.

[0044] As shown in FIGS. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, and 14, the first magnetic sensor pair 14 includes two magnetic sensors arranged at intervals. Each magnetic sensor can sense two magnetic field signals in orthogonal directions of the first magnetic encoder 111. Figure 4 and Figure 8 As shown in FIGS. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, and 14, one magnetic sensor in the first magnetic sensor pair 14 is used as a reference path for sensing two magnetic field signals in orthogonal directions and outputting two analog signals cos1 and sin1, and the other sensor is used as a differential path for sensing two magnetic field signals in orthogonal directions and outputting two analog signals cos2 and sin2. The magnetic field signal sensed by the sensor of the differential path is equal in size and opposite in direction to the magnetic field signal sensed by the reference path. cos1 and cos2 constitute a set of differential signals, and sin1 and sin2 constitute a set of differential signals.

[0045] In an example, the first magnetic sensor pair 14 includes two Hall sensors. The Hall sensors work based on the Hall effect, and the Hall sensors can convert the magnetic field signal into a voltage signal. When the magnetic field acts on the Hall sensor, a Hall voltage signal related to the magnetic field strength is generated on both sides of the Hall sensor, and based on the Hall voltage, two analog signals for differential processing can be output.

[0046] In another example, the first magnetic sensor pair 14 includes two magnetoresistance sensors. The magnetoresistance sensors work based on the magnetoresistance effect, and when the magnetic field changes, the resistance value changes. The magnetoresistance sensors can convert the magnetic field change into an electrical signal, and output two analog signals for differential.

[0047] In the embodiments of the present application, the first magnetic sensor pair 14 is configured to sense the magnetic field signal of the first magnetic encoder 111 and output two sets of differential signals in orthogonal directions when the mover 20 moves relative to the stator 30, so as to determine the movement distance of the mover 20 relative to the stator 30. Compared with the way of converting a single-ended input signal into a differential signal through a single-ended-to-differential signal chip, the first magnetic sensor pair 14 can directly output two sets of differential signals in orthogonal directions, which helps to reduce the volume of the position detection device 10, reduce the space occupation, and facilitate the miniaturization design of the position detection device 10.

[0048] Referring to Figure 3 , Figure 3 The structure schematic diagram of the sensing mechanism 12 provided in the embodiments of the present application, in some embodiments, the first magnetic sensor pair 14 includes a first magnetic sensor 141 and a second magnetic sensor 142 arranged at intervals. The first magnetic sensor 141 and the second magnetic sensor 142 are both configured to sense two magnetic field signals in orthogonal directions of the first magnetic encoder 111, so that the first magnetic sensor pair 14 can obtain a differential mode signal, thereby outputting orthogonal signals, which helps to improve the anti-interference ability of the position detection device 10, especially in the large current working scenario of the motor 100.

[0049] Exemplarily, the first magnetic sensor 141 outputs analog signals cos1 and sin1, and cos1 and sin1 are two magnetic signals in orthogonal directions. The second magnetic sensor 142 outputs analog signals cos2 and sin2, and cos2 and sin2 are two magnetic signals in orthogonal directions. The size of cos1 and cos2 is equal and the direction is opposite, and cos1 and cos2 are a set of differential signals. The size of sin1 and sin2 is equal and the direction is opposite, and sin1 and sin2 are a set of differential signals. The first magnetic sensor pair 14 can output two sets of differential signals of cos1 and cos2, and sin1 and sin2.

[0050] Reference Figure 3 In some embodiments, the first magnetic encoder 111 is a linear magnetic encoder, which includes opposite magnetic poles arranged alternately along the length direction of the linear magnetic encoder, and two adjacent opposite magnetic poles define a first magnetic pole pair 112.

[0051] During the movement of the mover 20, the first magnetic sensor 141 and the second magnetic sensor 142 do not exceed the magnetic field range of the first magnetic encoder 111 and do not contact the edge of the first magnetic sensor 141. Thus, the magnetic field of the first magnetic sensor 141 can be weakened, thereby preventing the first magnetic sensor 141 and the second magnetic sensor 142 from being unable to sense the magnetic field signal.

[0052] Reference Figure 4 , Figure 6 and Figure 7 , Figure 4 This application provides a schematic diagram showing the positions of the first magnetic encoder 111 and the first magnetic pole pair 112 in an embodiment of the present application. Figure 6 A schematic diagram of the magnetic field components at the sensitive centers of the two magnetic sensors in the first magnetic sensor pair 14 provided in this application embodiment; Figure 7 This is a schematic diagram illustrating the elimination of common-mode interference in the sensing mechanism 12 provided in an embodiment of this application. In some embodiments, along the length direction of the first magnetic encoder 111, the width of the first magnetic pole pair 112 is L1, and the distance between the first magnetic sensor 141 and the second magnetic sensor 142 is NL1+L1 / 2, where N is a natural number.

[0053] For example, such as Figure 4 As shown, the width of the first magnetic pole pair 112 is one cycle, and the distance between the first magnetic sensor 141 and the second magnetic sensor 142 is half a cycle.

[0054] This configuration allows the first magnetic sensor to sense magnetic signals of equal magnitude but opposite direction, and output a differential signal.

[0055] like Figure 6 As shown, the first magnetic sensor pair 14 can sense magnetic signals in two positive directions, BZ' and BX', and the second magnetic sensor pair 15 can sense magnetic signals in two positive directions, BZ and BX. BZ' and BZ are equal in magnitude and opposite in direction, while BX' and BX are equal in magnitude and opposite in direction. This helps to alleviate the common-mode interference experienced by the first magnetic sensor pair 14 when sensing magnetic field signals and improves the position measurement accuracy.

[0056] In some embodiments, L1 satisfies: 10mm ≤ L1 ≤ 30mm, so that the width of the first magnetic pole pair 112 is within a suitable range. This setting helps to keep the distance between the first magnetic sensor 141 and the second magnetic sensor 142 within a smaller range, reducing the size of the position detection device 10.

[0057] It can be understood that if the width of the first magnetic pole pair 112 is 13, the interval between the first magnetic sensor 141 and the second magnetic sensor 142 can be 6.5mm, 19.5mm, 32.5mm, etc.

[0058] Exemplarily, L1 can be 10mm, 12mm, 13mm, 14mm, 17mm, 20mm, 22mm, 25mm, 27mm, 29mm, 30mm, and any value therebetween.

[0059] In some embodiments, the first magnetic sensor 141 and the second magnetic sensor 142 are both 3D magnetic sensors. In this way, the first magnetic sensor 141 and the second magnetic sensor 142 can sense the magnetic field signals of the first magnetic encoder 111 in three-dimensional space (X, Y, Z axes), which helps to improve the position detection accuracy.

[0060] In some embodiments, the first magnetic sensor 141 and the second magnetic sensor 142 are both 3D Hall sensors.

[0061] Referring to Figure 2 , Figure 3 and Figure 5 , Figure 5 The second magnetic encoder 113 and the second magnetic pole pair 114 are provided in the embodiment of the application. In some embodiments, the magnetic mechanism 11 further comprises a second magnetic encoder 113, and the sensing mechanism 12 further comprises a second magnetic sensor pair 15.

[0062] The second magnetic encoder 113 is arranged in parallel with the first magnetic encoder 111, and the magnetic pole pairs of the second magnetic encoder 113 are arranged in a staggered manner with the magnetic pole pairs of the first magnetic encoder 111. The second magnetic sensor pair 15 is arranged in a staggered manner with the first magnetic sensor pair. The second magnetic encoder 113 comprises alternating magnetic poles, and each two adjacent magnetic poles define a second magnetic pole pair 114.

[0063] It can be understood that the magnetic mechanism 11 is a double-channel magnetic encoder. In this way, the determination accuracy of the moving distance of the mover 20 relative to the stator 30 is improved, and the detection accuracy of the position detection device 10 is improved.

[0064] In actual application, the first magnetic encoder 111 can be used as a main channel to provide absolute position information and to determine the rough range of the position. When the first magnetic encoder 111 moves with the mover 20, the change of the magnetic field on the main channel is detected by the first magnetic sensor pair 14 to generate two sets of orthogonal differential signals, and the rough moving range of the mover 20 relative to the stator 30 can be obtained.

[0065] The second magnetic encoder 113 can be used as a cursor code track, the magnetic pole pairs of the cursor code track are misaligned with the magnetic pole pairs of the main code track, the second magnetic pole pair 15 and the signal output by the first magnetic pole pair 14 are different, the cursor code track can be used to subdivide the signal period of the main code track, so as to further improve the measurement accuracy.

[0066] The second magnetic sensor pair 15 is configured to sense the magnetic field signal of the second magnetic encoder 113 when the mover 20 moves relative to the stator 30 and output two sets of differential signals in orthogonal directions to determine the movement distance of the mover 20 relative to the stator 30.

[0067] It should be noted that the first magnetic sensor pair 14 can be used to obtain the coarse movement range of the mover 20 relative to the stator 30 based on the differential signal output by the first magnetic encoder 111. On this basis, the second magnetic sensor pair 15 can also be used to obtain the coarse movement range of the mover 20 relative to the stator 30 based on the differential signal output by the second magnetic encoder 113. Since the magnetic pole pairs of the first magnetic encoder 111 and the second magnetic encoder 113 are misaligned, there is a phase difference between them, and therefore, the phase difference between them helps to determine the fine movement distance of the mover 20 relative to the stator 30. The principle of obtaining the fine movement distance by the double encoder is similar to the double reading head design of the grating ruler.

[0068] It can be understood that the second magnetic encoder 113 generates a magnetic field, and the sensing mechanism 12 is arranged close to the magnetic mechanism 11 to sense the change of the magnetic field of the magnetic mechanism 11. When the mover 20 moves, the position of the mover 20 relative to the stator 30 changes, and the position of the second magnetic encoder 113 relative to the second magnetic sensor 142 changes. The second magnetic sensor pair 15 can sense the change of the magnetic field strength and direction of the second magnetic encoder 113 and convert the sensed magnetic field signal into an analog signal. The change rule of the analog signal corresponds to the change of the magnetic field of the second magnetic encoder 113, and the analog signal can be a voltage signal or a current signal.

[0069] It can be understood that the second magnetic sensor pair 15 includes two magnetic sensors arranged at intervals, and each magnetic sensor can sense two magnetic field signals of the second magnetic encoder 113 in orthogonal directions.

[0070] The structure of the second magnetic sensor pair 15 can be the same as that of the first magnetic sensor pair 14.

[0071] In the embodiment of the application, the second magnetic sensor pair 15 outputs two sets of differential signals in orthogonal directions, which helps to reduce the common mode interference when the second magnetic sensor pair 15 senses the change of the magnetic field, and improves the anti-interference ability of the position detection device.

[0072] In addition, the second magnetic sensor pair 15 also provides a redundancy function, that is, in the case that one of the first magnetic sensor pair 14 is damaged, the two sets of differential signals of the orthogonal directions output by the second magnetic sensor pair 15 can still be used to determine the moving distance of the mover 20 relative to the stator 30, which helps to reduce the risk of failure of the position detection device 10.

[0073] In some embodiments, the second magnetic sensor pair 15 includes a third magnetic sensor 151 and a fourth magnetic sensor 152 arranged at intervals, and the third magnetic sensor 151 and the fourth magnetic sensor 152 are both configured to sense two magnetic field signals of the second magnetic encoder 113 in orthogonal directions.

[0074] Exemplarily, the third magnetic sensor 151 outputs analog signals cos3 and sin3, and the fourth magnetic sensor 152 outputs analog signals cos4 and sin4, where cos3 and sin3 are two magnetic signals in orthogonal directions, and cos4 and sin4 are two magnetic signals in orthogonal directions. The magnitudes of cos3 and cos4 are equal and the directions are opposite, and cos3 and cos4 form a set of differential signals. The magnitudes of sin3 and sin4 are equal and the directions are opposite, and sin3 and sin4 form a set of differential signals. The second magnetic sensor pair 15 can output two sets of differential signals of cos3 and cos4 and sin3 and sin4.

[0075] In some embodiments, the third magnetic sensor 151 and the fourth magnetic sensor 152 are both 3D magnetic sensors. In this way, the third magnetic sensor 151 and the fourth magnetic sensor 152 can sense the magnetic field signals in the three-dimensional space (X, Y, Z axes) of the second magnetic encoder 113, which helps to improve the position detection accuracy.

[0076] In some embodiments, the third magnetic sensor 151 and the fourth magnetic sensor 152 are both 3D Hall sensors.

[0077] In some embodiments, the width of the first magnetic pole pair 112 is not equal to the width of the second magnetic pole pair 114. In this way, the magnetic pole pairs of the second magnetic encoder 113 and the magnetic pole pairs of the first magnetic encoder 111 can be arranged in a staggered manner.

[0078] Exemplarily, the width of the second magnetic pole pair 114 is greater than the width of the first magnetic pole pair 112.

[0079] In some embodiments, the width of the first magnetic pole pair 112 is 13 mm, and the width of the second magnetic pole pair 114 is 14 mm. The distance between the first magnetic sensor 141 and the second magnetic sensor 142 is 6.5 mm, and the distance between the third magnetic sensor 151 and the fourth magnetic sensor 152 is 7 mm.

[0080] In some embodiments, the first magnetic encoder 111 is a linear magnetic encoder, and the second magnetic encoder 113 is a linear magnetic encoder. It can be understood that the magnetic mechanism 11 extends linearly. In this way, the position detection device 10 can be applied to a motor 100 in which the stator 30 moves linearly.

[0081] In some embodiments, the width of the second magnetic pole pair 114 is L2, and the interval between the third magnetic sensor 151 and the fourth magnetic sensor 152 is ML2+L2 / 2, where M is a natural number. In this way, the second magnetic sensor pair 15 can sense magnetic signals of equal size and opposite directions, output a differential signal, and alleviate the common-mode interference of the second magnetic sensor pair when sensing the magnetic field signal, thereby improving the position detection accuracy and facilitating the arrangement of the position detection device 10 near a strong magnetic interference source (such as near a motor or a battery wire harness).

[0082] It can be understood that the working principle of the second magnetic pole pair 114 and the first magnetic pole pair 112 can be the same, and the magnetic field will not be described again.

[0083] It can be understood that if the width of the second magnetic pole pair 114 is 14, the width of the second magnetic pole pair 114 can be 7 mm, 21 mm, 28 mm, etc.

[0084] Exemplarily, as shown in Figure 5 , the width of the second magnetic pole pair 114 is one period, and the interval between the third magnetic sensor 151 and the fourth magnetic sensor 152 is half a period. In this way, the second magnetic sensor pair 15 can sense magnetic signals of equal size and opposite directions, and output a differential signal.

[0085] In other embodiments, the first magnetic encoder 111 and the second magnetic encoder 113 can also be annular magnetic strips, wherein a plurality of first magnetic pole pairs 112 are arranged in a circle around a center axis, a plurality of second magnetic pole pairs 114 are arranged in a circle around the same center axis, and the first magnetic encoder 111 and the second magnetic encoder 113 are concentric. The specific structure of the annular magnetic strip can adopt the prior art, and the present application will not be described again. In this way, the position detection device 10 can be applied to detect the rotational position information of the mover 20 relative to the stator 30.

[0086] Referring to Figure 3 , in some embodiments, the sensing mechanism 12 further includes a processor 16, the first magnetic sensor 141 and the second magnetic sensor 142 are both in signal connection with the processor 16, and the processor 16 is configured to determine the movement distance of the mover 20 relative to the stator 30 based on the differential signal output by the first magnetic sensor pair 14. In this way, the first magnetic sensor 141 and the second magnetic sensor 142 share the processor 16, which facilitates the improvement of the integration degree.

[0087] In some embodiments, the sensing mechanism 12 further comprises a processor 16, and the third magnetic sensor 151 and the fourth magnetic sensor 152 are both in signal connection with the processor 16. The processor 16 is configured to determine the moving distance of the mover 20 relative to the stator 30 based on the differential signals output by the second magnetic sensor pair 15. In this way, the third magnetic sensor 151 and the fourth magnetic sensor 152 can share the processor 16 in signal, which helps to improve the integration.

[0088] In some embodiments, the sensing mechanism 12 further comprises a processor 16, and the first magnetic sensor 141, the second magnetic sensor 142, the third magnetic sensor 151 and the fourth magnetic sensor 152 are all in signal connection with the processor 16. The processor 16 is configured to determine the moving distance of the mover 20 relative to the stator 30 based on the differential signals output by the first magnetic sensor pair 14 and the second magnetic sensor pair 15. In this way, the first magnetic sensor pair 14 and the second magnetic sensor pair 15 can share the processor 16, which helps to improve the integration.

[0089] In some embodiments, the sensing mechanism 12 further comprises a circuit board 13, and the first magnetic sensor 141, the second magnetic sensor 142, the third magnetic sensor 151, the fourth magnetic sensor 152 and the processor 16 are all arranged on the circuit board 13. In this way, the first magnetic sensor 141, the second magnetic sensor 142, the third magnetic sensor 151, the fourth magnetic sensor 152 and the processor 16 are integrated into the same circuit board 13, which helps to improve the integration of the position detection device 10.

[0090] Referring to Figure 8 , Figure 8 The sensing mechanism 12 and the processor 16 provided by the embodiments of the present application are electrically connected as shown in the schematic diagram, and the working principle of the position detection device 10 is as follows:

[0091] The first magnetic sensor 141 senses two magnetic field signals in orthogonal directions of the first magnetic encoder 111 and outputs two analog signals of sin1 and cos1, the second magnetic sensor 142 senses two magnetic field signals in orthogonal directions of the second magnetic encoder 113 and outputs two analog signals of sin2 and cos2, the third magnetic sensor 151 senses two magnetic field signals in orthogonal directions of the second magnetic encoder 113 and outputs two analog signals of sin3 and cos4, and the fourth magnetic sensor 152 senses two magnetic field signals in orthogonal directions of the second magnetic encoder 113 and outputs two analog signals of sin4 and cos4. The analog signals obtained by the first magnetic sensor 141, the second magnetic sensor 142, the third magnetic sensor 151 and the fourth magnetic sensor 152 are converted into digital signals recognizable by the processor 16 through ADC (Analog-to-Digital Converter), the processor 16 differentiates the digital signals, and the moving distance of the mover 20 relative to the stator 30 is determined by using the differentiated signals of cos1-cos2, sin1-sin2, cos3-cos4 and sin3-sin4.

[0092] According to a second aspect of the present application, a motor 100 is provided, which comprises the position detection device 10 provided in the first aspect. Since the motor 100 comprises the position detection device 10, the motor 100 has all the beneficial effects of the position detection device 10, which will not be repeated here.

[0093] In some embodiments, the motor 100 comprises a center rod and a shell, the magnetic mechanism 11 is arranged on the center rod, the sensing mechanism 12 is arranged on the shell, the center rod is the mover 20, and the shell is the stator 30.

[0094] According to a third aspect of the present application, a suspension system is provided, which comprises the motor 100 provided in the second aspect.

[0095] According to a fourth aspect of the present application, a vehicle is provided, which comprises the position detection device 10 provided in the first aspect, or the motor 100 provided in the second aspect, or the suspension system provided in the third aspect. Since the vehicle comprises the position detection device 10, the vehicle has all the beneficial effects of the position detection device 10, which will not be repeated here.

[0096] The motor is used as an actuator of the suspension system. Taking a linear motor as an example, the linear motor directly generates linear motion through electric energy, dynamically adjusts suspension parameters such as damping, stiffness or vehicle height, and optimizes driving comfort and handling.

[0097] The vehicle can be a fuel automobile, a plug-in hybrid electric vehicle or a new energy vehicle, and the present disclosure does not make specific limitations thereto.

[0098] In the description of the application, the terms "first", "second", etc. are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0099] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0100] The embodiments, implementation manners and related technical features of the present application can be combined or replaced with each other without conflict.

[0101] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made to the above embodiment in accordance with the technical essence of the present application without departing from the technical solution content of the present application still falls within the scope of the technical solution of the present application.

Claims

1. A position detecting device characterized by comprising: The magnetic mechanism is configured to be arranged on one of the mover and the stator, and comprises a first magnetic encoder. The sensing mechanism is configured to be arranged on the other one of the mover and the stator, and comprises a first magnetic sensor pair corresponding to the first magnetic encoder and configured to output two sets of differential signals in orthogonal directions when the mover moves relative to the stator, so as to determine the moving distance of the mover relative to the stator. The first magnetic sensor pair comprises a first magnetic sensor and a second magnetic sensor arranged at intervals, and the first magnetic sensor and the second magnetic sensor are both configured to sense two magnetic field signals in orthogonal directions of the first magnetic encoder.

2. The position detection device according to claim 1, characterized by The first magnetic encoder is a linear magnetic encoder.

3. The position detection device according to claim 2, characterized by The first magnetic encoder comprises alternatingly arranged magnetic poles of different polarities, and two adjacent magnetic poles of different polarities define a first magnetic pole pair, the width of the first magnetic pole pair is L1, and the interval between the first magnetic sensor and the second magnetic sensor is NL1+L1 / 2, where N is a natural number.

4. The position detection device according to claim 3, characterized by L1 satisfies 10mm≤L1≤30mm.

5. The position detection device according to claim 4, characterized by The first magnetic sensor and the second magnetic sensor are both 3D magnetic sensors.

6. The position detection device according to claim 2, wherein The sensing mechanism further comprises a processor, the first magnetic sensor and the second magnetic sensor are both signal-connected to the processor, and the processor is configured to determine the moving distance of the mover relative to the stator based on the differential signals.

7. The position detection device according to claim 2, wherein The magnetic mechanism further comprises a second magnetic encoder connected to and arranged in parallel with the first magnetic encoder, and the magnetic pole pairs of the second magnetic encoder are arranged in a staggered manner with the magnetic pole pairs of the first magnetic encoder.

8. The position detection device according to any one of claims 1 to 7, characterized by, The sensing mechanism further comprises a second magnetic sensor pair corresponding to the second magnetic encoder and configured to output two sets of differential signals in orthogonal directions when the mover moves relative to the stator, so as to determine the moving distance of the mover relative to the stator. The width of the magnetic pole pairs of the second magnetic encoder is not equal to the width of the magnetic pole pairs of the first magnetic encoder.

9. The position detection device according to claim 8, wherein The second magnetic sensor pair comprises a third magnetic sensor and a fourth magnetic sensor arranged at intervals, and the third magnetic sensor and the fourth magnetic sensor are both configured to sense two magnetic field signals in orthogonal directions of the second magnetic encoder.

10. The position detection device according to claim 8, wherein The third magnetic sensor and the fourth magnetic sensor are both 3D magnetic sensors.

11. The position detection device according to claim 10, wherein The second magnetic encoder is a linear magnetic encoder.

12. The position detection device according to claim 11, wherein The second magnetic encoder comprises alternatingly arranged magnetic poles of different polarities, and two adjacent magnetic poles of different polarities define a second magnetic pole pair, the width of the second magnetic pole pair is L2, and the interval between the third magnetic sensor and the fourth magnetic sensor is ML2+L2 / 2, where M is a natural number.

13. The position detection device according to claim 12, wherein The position detection device comprises any one of claims 1-13.

14. An electric machine characterized by The motor comprises a center rod and a shell, the magnetic mechanism is arranged on the center rod, the sensing mechanism is arranged on the shell, the center rod is the mover, and the shell is the stator.

15. The electric machine of claim 14, wherein, The motor comprises any one of claims 14 or 15.

16. A suspension system characterized by ​ 17. A vehicle characterized by comprising: A position detection device as claimed in any one of claims 1-13; or an electric machine as claimed in claim 14 or 15; or a suspension system as claimed in claim 16.

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