Hall speed sensor

Abstract

The invention relates to the technical field of speed sensors, in particular to a Hall type speed sensor which comprises an offset assembly, a deflection assembly, a connecting device and a calibration device. The offset assembly is fixedly mounted in the vehicle body; the deflection assembly is rotationally mounted in the offset assembly; the connecting device is connected between the deflection assembly and the magnetic gear; the calibration device is connected with the offset assembly; through the offset assembly and the deflection assembly, it is ensured that the relative position between the Hall element and the magnetic gear does not change, the detection precision is improved, and when the Hall element rotates in the rotation direction of the magnetic gear, the calibration device measures and calculates the deflection angle to correct the speed measurement result; the problem that the Hall element and the magnetic gear vibrate and are different in frequency and amplitude, so that the speed measurement result is inaccurate is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of speed sensors, and particularly to a Hall speed sensor. Background Art

[0002] A Hall speed sensor is a sensor based on the Hall effect principle used to measure rotational speed or linear speed. It mainly consists of a Hall element, a permanent magnet, a signal circuit, and a packaging interface, and is currently widely used in the fields of automotive, aerospace, and industrial manufacturing.

[0003] When a Hall speed sensor is used for speed measurement on a vehicle, a magnetic gear is installed on the rotating shaft that needs to be speed-measured, and the Hall speed sensor is fixed near it. The periodic movement of the teeth of the magnetic gear causes fluctuations in the magnetic field strength, thereby forming a pulse signal. The rotational speed can be calculated through the frequency of the pulse signal. However, during emergency braking or vehicle bumpy vibration, the gap between the sensor and the gear will change dynamically, resulting in non-periodic fluctuations in the magnetic field strength, causing the output waveform of the sensor to have value fluctuations or intermittent interruptions, thus leading to errors in the speed measurement results. The prior art has proposed a solution to the error in speed measurement results caused by mechanical vibration. For example, in the speed sensor with the patent publication number CN217655142U, two Hall elements are arranged with opposite detection directions, and two magnetic steels with opposite magnetic poles are arranged on the drum. After the two Hall elements detect the corresponding magnetic steels, the measured data is transmitted to the single-chip microcomputer, and the single-chip microcomputer mutually verifies and corrects the signals of the two Hall elements through the signal phase difference, thereby reducing the influence of mechanical vibration on the speed measurement data.

[0004] Although the prior art has solved the problem of errors in speed measurement results caused by fluctuations in pulse signals during vibration, there are still the following problems: When used in a vehicle, the body's bumpy vibration will cause the magnetic gear and the Hall element to vibrate to varying degrees. At this time, the distance between the Hall element and the magnetic gear changes irregularly. When using multiple Hall elements for mutual verification and error correction, the vibration frequencies and amplitudes of the multiple Hall elements are different, so it is impossible to solve the situation of speed measurement errors caused by overall vibration.

[0005] In view of the above situation, in order to overcome the above technical problems, the present invention designs a Hall speed sensor. Summary of the Invention

[0006] The present invention provides a Hall - type speed sensor, which solves the problem that inaccurate speed measurement results are caused by the vibrations of both the Hall element and the magnetic gear with different frequencies and amplitudes. By setting an offset component and a deflection component, when the magnetic gear and the Hall element are offset in the horizontal and vertical directions, the offset component and the connecting device will cause the magnetic gear and the Hall element to offset synchronously and achieve a vibration - damping effect, ensuring that their relative positions do not change; when the magnetic gear and its rotating shaft deflect, the deflection component drives the Hall element to rotate within the offset component, so that the relative positions of the magnetic gear and the Hall element do not change; and when the Hall element and the magnetic gear rotate relatively in the rotation direction of the magnetic gear, the calibration device will measure and compensate the deflection angle and the speed - measurement data of the Hall element to ensure accurate speed - measurement results.

[0007] To achieve the above object, the present invention provides the following technical solutions: A Hall - type speed sensor includes a magnetic gear and a signal cable; it also includes a Hall element, a synchronization device, a connecting device, and a calibration device; the Hall element is connected to the signal cable; the synchronization device includes an offset component and a deflection component; the offset component is fixedly installed in the vehicle body; the deflection component is rotatably installed within the offset component; the connecting device is connected between the deflection component and the magnetic gear. When the magnetic gear deflects, the connecting device drives the deflection component and the Hall element to deflect within the offset component. When the magnetic gear is offset or the vehicle body vibrates, the connecting device drives the Hall element and the magnetic gear to offset synchronously through the offset component; the calibration device is connected to the offset component. When the offset component deflects in the rotation direction of the magnetic gear, the calibration device measures and corrects the speed - measurement result of the Hall element.

[0008] Preferably, the offset component includes a fixed seat, an offset slider, and an offset spring; the fixed seat is fixedly installed in the vehicle body, and an offset groove is formed in the fixed seat; the offset slider is slidably installed in the offset groove; the offset spring is connected between the offset slider and the offset groove.

[0009] In the above solution, when the vehicle body vibrates, the offset spring can absorb a certain amount of vibration force, thereby reducing the vibration amplitude of the offset slider. And the offset spring will allow the offset slider to slide within the offset groove. On the one hand, it can enable the Hall element to move horizontally and vertically synchronously with the magnetic gear, thus ensuring that the relative position relationship between the Hall element and the magnetic gear does not change, and further ensuring the measurement accuracy. On the other hand, it can reduce the offset amplitude and help it reset quickly. When the vehicle body does not vibrate and only slight vibration occurs during the high-speed rotation of the shaft where the magnetic gear is located, with the help of the offset slider and the connecting device, the Hall element can vibrate synchronously with the magnetic gear. And at this time, the offset slider can react the buffer force to the shaft where the magnetic gear is located under the buffer and shock absorption effect of the offset spring, thereby reducing the vibration of the magnetic gear and its shaft.

[0010] Preferably, the offset spring includes a vertical spring and a horizontal spring; the vertical spring is connected to the upper and lower horizontal planes of the offset slider; the horizontal spring is connected to the four vertical planes of the offset slider, and both the horizontal spring and the vertical spring are conical springs.

[0011] In the above solution, through the horizontal spring and the vertical spring, the offset slider can drive the Hall element to slide in the horizontal and vertical directions, ensuring that the Hall element has degrees of freedom in multiple directions, so that the Hall element can synchronously offset with the magnetic gear. And the conical offset spring can help the offset slider slide vertically and horizontally at the same time. Compared with the cylindrical spring, the conical spring is less likely to undergo plastic deformation after being axially deformed and has good anti-fatigue and recovery performance.

[0012] Preferably, the deflection assembly includes an outer housing, a deflection groove, a deflection joint, and a limiting assembly; the outer housing is sleeved outside the Hall element and connected to the connecting device; the deflection groove is opened in the offset slider; the deflection joint is connected to the outer housing and installed in the deflection groove; the limiting assembly is connected to the deflection joint.

[0013] In the above solution, when the vehicle body vibrates, the deflection joint can help the outer housing drive the Hall element inside it to deflect quickly, improve its response speed, and can reduce the number of horizontal springs and vertical springs that need to be compressed, while reducing the amplitude of axial deformation required for the horizontal spring and the vertical spring, and extending their service life. In addition, when the fixed seat and the offset slider vibrate significantly, the vibration can be prevented from being transmitted to the magnetic gear and its shaft through the mutual rotation between the deflection groove and the deflection joint, thus ensuring the stable rotation of the magnetic gear and its shaft.

[0014] Preferably, the limiting component includes a limiting groove and a limiting rod; the limiting groove is formed on the deflection joint; one end of the limiting rod is connected to the inner wall of the deflection groove of the offset slider, and the other end is installed in the limiting groove.

[0015] In the above solution, when the axis where the magnetic gear is located deflects, the relative position between the Hall element and the magnetic gear can always be kept the same through the deflection of the deflection joint in the deflection groove. However, when the rotation direction of the Hall element driven by the deflection joint is the same as or opposite to the rotation direction of the magnetic gear, relative rotation will occur between the Hall element and the magnetic gear, resulting in a small deviation in the speed measurement result. And after the rotation in this direction, since the magnetic gear needs to rotate relative to the Hall element during the speed measurement process, it cannot be reset by the connecting device. Therefore, the limiting component will limit it in the rotation direction of the magnetic gear to improve the accuracy of detection.

[0016] Preferably, the limiting groove is an annular groove and the axis of the limiting groove is perpendicular to the axis of the magnetic gear; the diameter of the limiting rod is equal to the width of the limiting groove.

[0017] In the above solution, the limiting groove being an annular groove and the axis of the limiting groove being perpendicular to the axis of the magnetic gear can ensure that the deflection joint can rotate in all directions except the same or opposite rotation direction as the magnetic gear, so as to ensure that the magnetic gear can be compensated by the deflection joint in all directions except when the rotation direction deflects. And after limiting the rotation direction of the magnetic gear, when it deflects in other directions, since the magnetic gear and its shaft can be reset, and the connecting device drives the deflection joint to be automatically reset during the reset process, the relative position between the Hall element and the magnetic gear can always be kept the same; at this time, when the Hall element wants to deflect in the rotation direction of the magnetic gear, it can only be achieved by the deflection of the offset slider.

[0018] Preferably, the connecting device includes a connecting arm, a fixing disk, a half-turn groove and a rotor; one end of the connecting arm is connected to the outer housing, and the other end is sleeved at both end faces of the magnetic gear; the fixing disk is arranged outside the connecting arm and is threadedly connected to the magnetic gear; the half-turn groove is correspondingly formed on the connecting arm and the fixing disk; the rotors are circumferentially arranged in the half-turn groove.

[0019] In the above solution, when the magnetic gear deflects and vibrates, the deflection will be transmitted to the connecting arm through the rotor, and since the connecting arm is a rigid structure, it can drive the deflection joint to rotate in the deflection groove, and the rotor can convert the frictional force of the squeezed end face into rolling friction, so as to ensure that when the magnetic gear deflects and squeezes the connecting arm, excessive frictional force will not be generated, and thus the normal rotation of the magnetic gear will not be affected.

[0020] Preferably, the calibration assembly includes an angle sensor I and an angle sensor II; the angle sensor I is arranged at the uppermost end of the offset groove and aligned with the top of the offset slider; the angle sensor II is arranged at the uppermost end of the offset groove and aligned with the top of the offset slider, and is arranged on the same vertical plane as the angle sensor I.

[0021] In the above solution, the deflection angle of the offset slider can be measured by the angle sensor I and the angle sensor II. Also, since the deflection angle of the offset slider is equal to the deflection angle of the Hall element relative to the magnetic gear in the rotational direction, the measured speed data of the Hall element can be compensated through the measured angle, making the result more accurate.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Compared with the existing Hall speed sensors, by providing an offset assembly, a deflection assembly, and a connecting device that rigidly connects the Hall element and the magnetic gear, when the vehicle body vibrates, the offset spring can absorb and reduce vibrations while allowing the offset slider to slide within the offset groove, enabling the Hall element to move horizontally and vertically synchronously with the magnetic gear, thus ensuring that the relative position relationship between the Hall element and the magnetic gear does not change, and further ensuring the accuracy of the measurement. When the magnetic gear and its shaft deflect, the deflection of the deflection joint within the deflection groove can enable the Hall element and the magnetic gear to always maintain the same relative position and respond quickly, ensuring a more accurate speed measurement result.

[0023] 2. By providing a limit assembly in the present invention, and the axis of the limit groove is perpendicular to the axis of the magnetic gear, it can be ensured that the deflection joint cannot rotate only in the same or opposite rotational direction as the magnetic gear, so that the relative position between the Hall element and the magnetic gear always remains unchanged when the deflection joint rotates. After limiting the rotational direction of the magnetic gear, when it deflects in other directions, since the magnetic gear and its rotating shaft can reset, and the connecting device drives the deflection joint to automatically reset during the reset process, it is ensured that the Hall element and the magnetic gear always maintain the same relative position, and further ensure the accuracy of the speed measurement result.

[0024] 3. By providing an angle sensor I and an angle sensor II in the present invention, the deflection angle of the offset slider is measured. Since the deflection angle of the offset slider is equal to the deflection angle of the Hall element relative to the magnetic gear in the rotational direction, when the Hall element deflects relative to the magnetic gear, the measured deflection angle data can be used to compensate the speed measurement data of the Hall element, thus ensuring the accuracy of the final speed measurement result. Description of the Drawings

[0025] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0026] Figure 1 is the overall structure diagram of the present invention; Figure 2 is the schematic internal structure diagram of the fixing base of the present invention; Figure 3 is the schematic connection relationship diagram of the offset slider and the fixing base of the present invention; Figure 4 is the top view of the internal structure of the fixing base of the present invention; Figure 5 is the explosion diagram of the present invention; Figure 6 is the cross-sectional view of the connecting device of the present invention; Figure 7 is the schematic installation position diagram of the calibration device of the present invention; Figure 8 is the schematic diagram of the rotation state of the deflection joint when the magnetic gear of the present invention is in the deflected state; In the figure: 1. Magnetic gear; 2. Signal cable; 3. Hall element; 4. Synchronous device; 41. Offset component; 411. Fixing base; 4111. Offset groove; 412. Offset slider; 413. Offset spring; 4131. Vertical spring; 4132. Horizontal spring; 42. Deflection component; 421. Outer shell; 422. Deflection groove; 423. Deflection joint; 424. Limit component; 4241. Limit groove; 4242. Limit rod; 5. Connecting device; 51. Connecting arm; 52. Fixed disk; 53. Half-turn groove; 54. Rotor; 6. Calibration device; 61. Angle sensor one; 62. Angle sensor two. Specific Embodiments

[0027] To better understand the above technical solutions, the following will elaborate on the above technical solutions in combination with the drawings in the specification and specific embodiments.

[0028] Please refer to Figures 1 to 8 , the present invention provides a Hall speed sensor, and the technical solution is as follows: As a specific embodiment of the present invention, referring to Figure 1 , Figure 2 and Figure 5, A Hall speed sensor, comprising a magnetic gear 1 and a signal cable 2; further comprising a Hall element 3, a synchronization device 4, a connection device 5 and a calibration device 6; the Hall element 3 is connected to the signal cable 2; the synchronization device 4 includes an offset component 41 and a deflection component 42; the offset component 41 is fixedly installed in the vehicle body; the deflection component 42 is rotatably installed in the offset component 41; the connection device 5 is connected between the deflection component 42 and the magnetic gear 1. When the magnetic gear 1 deflects, it drives the deflection component 42 and the Hall element 3 to deflect in the offset component 41 through the connection device 5. When the magnetic gear 1 offsets or the vehicle body vibrates, the connection device 5 drives the Hall element 3 and the magnetic gear 1 to offset synchronously through the offset component 41; the calibration device 6 is connected to the offset component 41. When the offset component 41 deflects in the rotation direction of the magnetic gear 1, the calibration device 6 measures and corrects the speed measurement result of the Hall element 3.

[0029] As a specific embodiment of the present invention, referring to Figure 2 , Figure 3 and Figure 4 , the offset component 41 includes a fixed seat 411, an offset slider 412 and an offset spring 413; the fixed seat 411 is fixedly installed in the vehicle body, and an offset groove 4111 is formed in the fixed seat 411; the offset slider 412 is slidably installed in the offset groove 4111; the offset spring 413 is connected between the offset slider 412 and the offset groove 4111. When the vehicle body vibrates, the offset spring 413 can absorb a certain amount of vibration force, thereby reducing the vibration amplitude of the offset slider 412, and the offset spring 413 will allow the offset slider 412 to slide in the offset groove 4111. On the one hand, it can enable the Hall element 3 to move horizontally and vertically synchronously with the magnetic gear 1, so as to ensure that the relative position relationship between the Hall element 3 and the magnetic gear 1 does not change, thereby ensuring the accuracy of measurement. On the other hand, it can reduce the offset amplitude and help it quickly reset; when the vehicle body does not vibrate and only slight vibration occurs during the high-speed rotation of the shaft where the magnetic gear 1 is located, with the help of the offset slider 412 and the connection device 5, the Hall element 3 can vibrate synchronously with the magnetic gear 1, and at this time, the offset slider 412 can react the buffer force to the shaft where the magnetic gear 1 is located under the buffering and shock-absorbing action of the offset spring 413, thereby reducing the vibration of the magnetic gear 1 and its shaft.

[0030] As a specific embodiment of the present invention, referring to Figure 3 , Figure 4 and Figure 5, the offset spring 413 includes a vertical spring 4131 and a horizontal spring 4132; the vertical spring 4131 is connected to the upper and lower horizontal surfaces of the offset slider 412; the horizontal spring 4132 is connected to the four vertical surfaces of the offset slider 412, and both the horizontal spring 4132 and the vertical spring 4131 are conical springs. Through the horizontal spring 4132 and the vertical spring 4131, the offset slider 412 can drive the Hall element 3 to slide in the horizontal and vertical directions, ensuring that the Hall element 3 has degrees of freedom in multiple directions, so that the Hall element 3 can synchronously offset with the magnetic gear 1. Moreover, the conical offset spring 413 can help the offset slider 412 perform vertical and horizontal sliding simultaneously. Compared with a cylindrical spring, a conical spring is less likely to undergo plastic deformation after being deformed in the axial direction and has good anti-fatigue and recovery performance.

[0031] As a specific embodiment of the present invention, referring to Figure 3 , Figure 4 , Figure 5 and Figure 8 , the deflection assembly 42 includes a housing 421, a deflection groove 422, a deflection joint 423 and a limiting assembly 424; the housing 421 is sleeved outside the Hall element 3 and connected to the connecting device 5; the deflection groove 422 is opened in the offset slider 412; the deflection joint 423 is connected to the housing 421 and installed in the deflection groove 422; the limiting assembly 424 is connected to the deflection joint 423. When the vehicle body vibrates, the deflection joint 423 can help the housing 421 drive the Hall element 3 inside it to deflect quickly, improve its response speed, and can reduce the number of the horizontal spring 4132 and the vertical spring 4131 that need to be compressed, and at the same time reduce the amplitude of the axial deformation that the horizontal spring 4132 and the vertical spring 4131 need to undergo, prolonging their service life; in addition, when the fixed seat 411 and the offset slider 412 vibrate significantly, the vibration can be prevented from being transmitted to the magnetic gear 1 and its shaft through the mutual rotation between the deflection groove 422 and the deflection joint 423, thereby ensuring the stable rotation of the magnetic gear 1 and its shaft.

[0032] As a specific embodiment of the present invention, referring to Figure 4 , Figure 5 and Figure 7, the limiting component 424 includes a limiting groove 4241 and a limiting rod 4242; the limiting groove 4241 is formed on the deflection joint 423; one end of the limiting rod 4242 is connected to the inner wall of the deflection groove 422 of the offset slider 412, and the other end is installed in the limiting groove 4241. When the axis where the magnetic gear 1 is located deflects, the deflection of the deflection joint 423 in the deflection groove 422 can keep the Hall element 3 and the magnetic gear 1 in the same relative position all the time. However, when the rotation direction of the deflection joint 423 driving the Hall element 3 is the same as or opposite to the rotation direction of the magnetic gear 1, relative rotation will occur between the Hall element 3 and the magnetic gear 1, resulting in a small deviation in the speed measurement result. And after rotation occurs in this direction, since the magnetic gear 1 needs to rotate relative to the Hall element 3 during the speed measurement process, it cannot be reset by the connecting device 5. Therefore, the limiting component 424 will limit its movement in the rotation direction of the magnetic gear 1 to improve the accuracy of detection. The limiting groove 4241 is an annular groove and the axis of the limiting groove 4241 is perpendicular to the axis of the magnetic gear 1; the diameter of the limiting rod 4242 is equal to the width of the limiting groove 4241. The limiting groove 4241 being an annular groove and the axis of the limiting groove 4241 being perpendicular to the axis of the magnetic gear 1 can ensure that the deflection joint 423 can rotate in all directions except the same or opposite rotation direction as the magnetic gear 1, so as to ensure that the magnetic gear 1 can be compensated by the deflection joint 423 in all directions except when the rotation direction deflects. And after limiting the rotation direction of the magnetic gear 1, when deflecting in the remaining directions, since the magnetic gear 1 and its shaft can be reset, and the connecting device 5 drives the deflection joint 423 to automatically reset during the reset process, so as to ensure that the Hall element 3 and the magnetic gear 1 always maintain the same relative position; at this time, when the Hall element 3 wants to deflect in the rotation direction of the magnetic gear 1, it can only be achieved by the deflection of the offset slider 412.

[0033] As a specific embodiment of the present invention, refer to Figure 5 , Figure 6 and Figure 8, the connecting device 5 includes a connecting arm 51, a fixing disk 52, a half-turn groove 53 and a rotor 54; one end of the connecting arm 51 is connected to the outer housing 421, and the other end is sleeved at both end faces of the magnetic gear 1; the fixing disk 52 is arranged outside the connecting arm 51 and is threadedly connected to the magnetic gear 1; the half-turn groove 53 is correspondingly formed in the connecting arm 51 and the fixing disk 52; the rotors 54 are circumferentially and arrayedly installed in the half-turn groove 53. When the magnetic gear 1 deflects and vibrates, the deflection is transmitted to the connecting arm 51 through the rotor 54, and since the connecting arm 51 is a rigid structure, it can drive the deflection joint 423 to rotate in the deflection groove 422, and the deflection joint 423 and the deflection groove 422 are of a spherical structure, which can ensure that the rotational resistance is small, so as to ensure that when the magnetic gear 1 deflects and squeezes the connecting arm 51, excessive friction will not be generated, and further ensure that the normal rotation of the magnetic gear 1 will not be affected. At the same time, the rotor 54 converts the frictional force on the squeezed end face into rolling friction, which can minimize the frictional force to the greatest extent, thereby reducing the influence on the normal rotation of the magnetic gear 1.

[0034] As a specific implementation manner of the present invention, referring to Figure 7, the calibration assembly includes an angle sensor 1 (61) and an angle sensor 2 (62); the angle sensor 1 (61) is arranged at the uppermost end of the offset groove (4111) and aligned with the upper part of the offset slider (412); the angle sensor 2 (62) is arranged at the uppermost end of the offset groove (4111) and aligned with the top of the offset slider (412), and is arranged on the same vertical plane as the angle sensor 1 (61). When the Hall element (3) deflects in the rotation direction of the magnetic gear (1), the deflection joint (423) is restricted by the limiting rod (4242), and it can only deflect the Hall element (3) and the offset slider (412) together through the deformation of the vertical spring (4131) and the horizontal spring (4132). At this time, the deflection angle of the offset slider (412) in the rotation direction of the magnetic gear (1) is equal to the deflection angle of the Hall element (3) (and because the fixed seat (411) is fixed to the vehicle body by bolts, when subjected to vibration, it mainly performs horizontal or vertical offset relative to the vehicle body and its internal structure and does not rotate. Therefore, the plane where the angle sensor 1 (61) and the angle sensor 2 (62) are located can be regarded as a reference plane, and the horizontal offset, vertical offset, and combined offset of the magnetic gear (1) relative to this reference plane can all be compensated by the offset spring (413). At this time, the deflection angle of the offset slider (412) relative to this reference plane can be approximately regarded as the deflection angle in the rotation direction relative to the magnetic gear (1)). By measuring two points on the top of the offset slider (412) with the angle sensor 1 (61) and the angle sensor 2 (62), two distance values are measured, and with the distance between the angle sensor 1 (61) and the angle sensor 2 (62), the deflection angle of the offset slider (412) in the rotation direction of the magnetic gear (1) can be obtained by projecting onto a plane. This angle is equal to the deflection angle of the Hall element (3), and the result of the detection and calculation of the Hall element (3) can be corrected through this angle.

[0035] Working principle: When the magnetic gear (1) and the fixed seat (411) undergo radial offset or axial offset, the offset assembly (41) and the deflection assembly (42) drive the outer housing (421) and the Hall element (3) inside it to move in the same manner as the magnetic gear (1) through the connecting device (5), so as to keep the magnetic gear (1) and the Hall element (3) always maintain the same relative position relationship. And when the Hall element (3) deflects relative to the magnetic gear (1), the calibration device (6) corrects the speed measurement result of the Hall element (3) by calculating the deflection angle.

[0036] Specifically, when the magnetic gear 1 is offset relative to the fixed seat 411, if the magnetic gear 1 and its rotating shaft undergo radial or axial offset, the magnetic gear 1 presses the rotor 54 through the fixed disk 52 fixedly connected thereto, and then presses the connecting arm 51 rigidly connected to the outer housing 421 through the rotor 54. At this time, the connecting arm 51 drives the outer housing 421 and the Hall element 3 therein to offset together. At this time, the outer housing 421 presses the offset slider 412 through the deflection joint 423, so that the offset slider 412 presses the offset spring 413, realizing movement within the offset groove 4111, so that the Hall element 3 can synchronously offset with the magnetic gear 1, and the offset spring 413 will also provide a shock absorption effect during this process; when the magnetic gear 1 deflects relative to the fixed seat 411, as Figure 8 shown, the deflection joint 423 can help the outer housing 421 and the Hall element 3 therein to quickly deflect within the deflection groove 422, ensuring that the relative positions of the magnetic gear 1 and the Hall element 3 do not change, thereby ensuring the accuracy of the speed measurement result; due to the limiting effect of the limiting component 424, the deflection joint 423 cannot rotate in the rotation direction of the magnetic gear 1, so that the Hall element 3 will not rotate in the rotation direction of the magnetic gear 1 (including the opposite direction) during normal vibration. The relative position relationship between the Hall element 3 and the magnetic gear 1 is mainly maintained by the combined movement of the offset slider 412 in the horizontal and vertical directions and the rotation of the deflection joint 423. When the vehicle body generates a large vibration, resulting in a large vibration of the overall device and the Hall element 3 rotates in the rotation direction of the magnetic gear 1, the deflection joint 423 is restricted by the limiting rod 4242, and it can only realize the deflection of the Hall element 3 and the offset slider 412 together through the deformation of the vertical spring 4131 and the horizontal spring 4132. At this time, the deflection angle of the offset slider 412 in the rotation direction of the magnetic gear 1 is equal to the deflection angle of the Hall element 3. By measuring two points at the top of the offset slider 412 with the angle sensor one 61 and the angle sensor two 62, two distance values are measured, and through the distance between the angle sensor one 61 and the angle sensor two 62, the deflection angle of the offset slider 412 in the rotation direction of the magnetic gear 1 can be obtained, and this angle is equal to the deflection angle of the Hall element 3. Through this angle, the result of the speed measurement of the Hall element 3 can be corrected.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A Hall speed sensor, comprising a magnetic gear (1) and a signal cable (2); characterized in that: It also includes a Hall element (3), a synchronization device (4), a connection device (5), and a calibration device (6); the Hall element (3) is connected to the signal cable (2); the synchronization device (4) includes an offset component (41) and a deflection component (42); the offset component (41) is fixedly installed inside the vehicle body; the deflection component (42) is rotatably installed inside the offset component (41); the connection device (5) is connected between the deflection component (42) and the magnetic gear (1). When the magnetic gear (1) deflects, the deflection component (42) and the Hall element (3) are driven to deflect inside the offset component (41) through the connection device (5). When the magnetic gear (1) offsets or the vehicle body vibrates, the connection device (5) drives the Hall element (3) and the magnetic gear (1) to offset synchronously through the offset component (41); the calibration device (6) is connected to the offset component (41). When the rotation direction of the magnetic gear (1) deflects in the offset component (41), the calibration device (6) measures and corrects the speed measurement result of the Hall element (3).

2. The Hall type speed sensor according to claim 1, characterized in that: The offset component (41) includes a fixed seat (411), an offset slider (412), and an offset spring (413); the fixed seat (411) is fixedly installed inside the vehicle body, and an offset groove (4111) is formed inside the fixed seat (411); the offset slider (412) is slidably installed inside the offset groove (4111); the offset spring (413) is connected between the offset slider (412) and the offset groove (4111).

3. The Hall speed sensor according to claim 2, wherein: The offset spring (413) includes a vertical spring (4131) and a horizontal spring (4132); the vertical spring (4131) is connected to the upper and lower horizontal planes of the offset slider (412); the horizontal spring (4132) is connected to the four vertical planes of the offset slider (412), and both the horizontal spring (4132) and the vertical spring (4131) are conical springs.

4. The Hall speed sensor according to claim 2, characterized in that: The deflection component (42) includes an outer shell (421), a deflection groove (422), a deflection joint (423), and a limiting component (424); the outer shell (421) is sleeved outside the Hall element (3) and is connected to the connection device (5); the deflection groove (422) is formed inside the offset slider (412); the deflection joint (423) is connected to the outer shell (421) and is installed inside the deflection groove (422); the limiting component (424) is connected to the deflection joint (423) and forms a limit for the deflection joint (423) in the rotation direction of the magnetic gear (1).

5. The Hall speed sensor according to claim 4, characterized in that: The limiting component (424) includes a limiting groove (4241) and a limiting rod (4242); the limiting groove (4241) is formed on the deflection joint (423); one end of the limiting rod (4242) is connected to the inner wall of the deflection groove (422) of the offset slider (412), and the other end is installed inside the limiting groove (4241).

6. The Hall speed sensor according to claim 5, wherein: The limiting groove (4241) is an annular groove, and the axis of the limiting groove (4241) is perpendicular to the axis of the magnetic gear (1); the diameter of the limiting rod (4242) is equal to the width of the limiting groove (4241).

7. A Hall type speed sensor according to claim 4, wherein: The connecting device (5) includes a connecting arm (51), a fixing disk (52), a half-turn groove (53) and a rotor (54); one end of the connecting arm (51) is connected to the outer housing (421), and the other end is sleeved at both end faces of the magnetic gear (1); the fixing disk (52) is arranged outside the connecting arm (51) and is threadedly connected to the magnetic gear (1); the half-turn groove (53) is correspondingly formed in the connecting arm (51) and the fixing disk (52); the rotors (54) are circumferentially and arrayedly installed in the half-turn groove (53).

8. The Hall speed sensor according to claim 2, wherein: The calibration assembly includes an angle sensor I (61) and an angle sensor II (62); the angle sensor I (61) is arranged at the uppermost end of the offset groove (4111) and is aligned with the top of the offset slider (412); the angle sensor II (62) is arranged at the uppermost end of the offset groove (4111) and is aligned with the upper part of the offset slider (412), and is arranged on the same vertical plane as the angle sensor I (61).

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