KR102534522B1 - Assembly for sensing and apparatus for steering - Google Patents

Abstract

The present invention, the rotor in which the first magnet is disposed on the outer peripheral surface; a stator disposed outside the rotor; circuit board; a first cover accommodating the circuit board; the first hall sensor and the second hall sensor disposed on the circuit board; a magnet mounting member coupled to the stator; a second magnet coupled to the magnet mounting member; and a second cover made of a metal material coupled to the first cover, wherein the magnet mounting member and the second magnet are disposed between the first cover and the second cover, and the second cover is a top plate having a through hole formed therein. and a side plate extending from the top plate in a rotational axis direction, wherein the side plate includes a groove formed at a position corresponding to the hall sensor.

Description

Sensor assembly and steering device including the same {Assembly for sensing and apparatus for steering}

The embodiment relates to a sensor assembly and a steering device including the same.

The power steering system (Electronic Power System, hereinafter referred to as EPS) drives the motor from the Electronic Control Unit (EPS) according to driving conditions to ensure stability in turning and provide quick restoring force, enabling the driver to drive safely. let it do

The EPS includes a sensor assembly that measures a torque of a steering shaft, a steering angle, and the like, in order to provide an appropriate torque. The sensor assembly may include a torque sensor for measuring torque applied to the steering shaft and an index sensor for measuring angular acceleration of the steering shaft. The steering shaft may include an input shaft connected to the steering wheel, an output shaft connected to the power transmission component on the wheel side, and a torsion bar connecting the input shaft and the output shaft.

The torque sensor measures the torque applied to the steering shaft by measuring the degree of torsion of the torsion bar. The index sensor detects the rotation of the output shaft and measures the angular acceleration of the steering shaft. In the sensor assembly, these torque sensors and index sensors may be disposed together and constituted integrally.

However, in this sensor assembly, magnetic field interference occurs between the torque sensor and the index sensor. Therefore, in order to prevent magnetic field interference, a structure for shielding a magnetic field is separately provided between the torque sensor and the index sensor. Therefore, when trying to reduce the thickness of the entire sensor assembly, there is a problem in that magnetic leakage occurs while the magnetic shielding plate and the magnet are pinched. In addition, there is a limit in reducing the thickness of the entire sensor assembly due to the installation space of the magnetic field shielding configuration. As a result, this magnetic field shielding configuration has a problem of being an important factor in increasing the thickness of the entire sensor assembly.

Accordingly, it is an object of the present invention to provide a sensor assembly capable of reducing the thickness of the sensor assembly while avoiding magnetic field interference, and a steering device including the same.

The problems to be solved by the embodiments are not limited to the problems mentioned above, and other problems not mentioned herein will be clearly understood by those skilled in the art from the description below.

An embodiment for achieving the above object is a rotor having a first magnet disposed on an outer circumferential surface, a stator disposed outside the rotor, a circuit board, a first cover accommodating the circuit board, and a circuit board The first hall sensor and the second hall sensor are disposed, a magnet mounting member coupled to the stator, a second magnet coupled to the magnet mounting member, and a second cover made of metal coupled to the first cover. The magnet mounting member and the second magnet are disposed between the first cover and the second cover, the second cover including a top plate having a through hole and a side plate extending in a rotational axis direction from the top plate, and the side plate may provide a sensing assembly including a groove formed at a position corresponding to the Hall sensor.

Preferably, the first Hall sensor senses the magnetic flux of the stator, and the second Hall sensor senses the magnetic flux of the second magnet.

Preferably, the first cover includes a 1-1 cover and a 1-2 cover, the 1-1 cover includes a first hole through which the rotor passes, and the 1-2 cover A second hole through which the stator passes, and the circuit board may be disposed between the 1-1 cover and the 1-2 cover.

Preferably, the substrate includes a first surface facing the 1-1 cover and a second surface facing the 1-2 cover, the first hall sensor is disposed on the first surface, The second hall sensor may be disposed on the second surface.

Preferably, the side plate may be disposed between the second magnet and the second hall sensor based on a direction perpendicular to an axial direction of the rotation shaft.

Preferably, the first cover may include a hall sensor housing protruding from an outer surface and in which the second hall sensor is located.

Preferably, the hall sensor housing is provided with a slot accommodating the second hall sensor, and the slot may have an open surface.

Preferably, the slot may include a stopper protruding from an inlet on the open surface.

Preferably, the first cover is disposed on an outer surface and is concavely disposed along a circumference of the first hole through which the stator passes, and may include an accommodating portion in which the magnet seating member is seated.

Preferably, the magnet seating member may include a first surface facing the second cover and a second surface facing the first cover, and the second magnet may be disposed on the first surface.

Preferably, the magnet seating member may include a first coupling part coupled to the stator in a direction perpendicular to an axial direction of the rotation shaft.

Preferably, the stator may include two stator rings and a mold member fixing the two stator rings, and the mold member may include a second coupling portion coupled to a second coupling portion coupled to the first coupling portion. there is.

Preferably, the first coupling part may be at least one protrusion protruding from an inner circumferential surface of the magnet seating member, and the second coupling part may be a groove disposed on an outer circumferential surface of the stator holder into which the first coupling part is inserted.

Preferably, the first cover includes a hall sensor housing protruding from an outer surface and in which the second hall sensor is located, and the groove of the side plate of the second cover and the hall sensor housing are connected in the direction of rotation of the rotation shaft. can be sorted based on

Preferably, an inner diameter of the side plate of the second cover may be larger than an outer diameter of the magnet seating member.

Preferably, the second cover may include a hole through which the stator passes.

Preferably, the second cover may include a third coupling portion, and the first cover may include a fourth coupling portion coupled to the third coupling portion.

Preferably, the third coupling portion may be a coupling flange protruding from the side plate and including a coupling hole, and the fourth coupling portion may be a coupling protrusion protruding from the first cover and inserted into the coupling hole.

Another embodiment for achieving the above object includes a steering shaft and a sensing assembly coupled to the steering shaft, wherein the sensing assembly includes a rotor having a first magnet disposed on an outer circumferential surface thereof, and disposed outside the rotor. A stator, a circuit board, a first cover accommodating the circuit board, the first Hall sensor and the second Hall sensor disposed on the circuit board, a magnet seating member coupled to the stator, and the magnet seating member It includes a second magnet coupled to and a second cover made of a metal material coupled to the first cover, the magnet seating member and the second magnet are disposed between the first cover and the second cover, and the second cover may include a top plate having a through hole and a side plate extending in a rotation axis direction from the top plate, and the side plate may include a groove formed at a position corresponding to the hall sensor.

According to the embodiment, by avoiding magnetic field interference through a cover made of metal, an advantageous effect of reducing the thickness of the entire sensor assembly is provided.

According to the embodiment, by coupling the magnet mounting member and the stator in a direction perpendicular to the axial direction of the rotation shaft, an advantageous effect of further reducing the thickness of the sensor assembly is provided.

1 is a view showing a sensor assembly according to an embodiment;
2 is an exploded view of the sensor assembly shown in FIG. 1;
3 is a side view of the circuit board shown in FIG. 2;
4 is a side view of the magnet mounting member shown in FIG. 2;
5 is a view showing the 1-2 covers in FIG. 2;
6 is a view showing a hall sensor housing of a 1-2 cover;
7 is a bottom view of a 1-2 cover;
8 is a view showing a magnet mounting member;
9 is a view showing a coupled state of a stator mold member and a magnet seating member;
10 is a view showing a second cover;
11 is a view showing a magnet mounting member included in a second cover;
12 is a view showing a side plate disposed between a second magnet and a second hall sensor;
13 is a graph showing the flux due to the second cover;
14 is a table comparing the amount of change in torque output;
15 is a graph illustrating a torque output change amount.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings. And the terms or words used in this specification and claims should not be construed as being limited to ordinary or dictionary meanings, and the inventor appropriately defines the concept of terms in order to explain his/her invention in the best way. Based on the principle that it can be done, it should be interpreted as meaning and concept consistent with the technical spirit of the present invention. And, in describing the present invention, detailed descriptions of related known technologies that may unnecessarily obscure the subject matter of the present invention will be omitted.

Terms including ordinal numbers such as second and first may be used to describe various components, but the components are not limited by the terms. These terms are only used for the purpose of distinguishing one component from another. For example, a second element may be termed a first element, and similarly, a first element may be termed a second element, without departing from the scope of the present invention. The terms and/or include any combination of a plurality of related recited items or any of a plurality of related recited items.

1 is a view showing a sensor assembly according to an embodiment, and FIG. 2 is an exploded view of the sensor assembly shown in FIG. 1 .

1 and 2, the sensor assembly 10 includes a rotor 100, a stator 200, a circuit board 300, a first cover 400, and a first hall sensor 500. And, a second hall sensor 600, a magnet mounting member 700, a second magnet 800, and a second cover 900 may be included.

The rotor 100 is disposed inside the stator 200. The rotor 100 is connected to an input shaft of a steering shaft. Here, the input shaft may be a steering shaft connected to a steering wheel. The rotor 100 may include a cylindrical yoke 110 and a first magnet 120 disposed on the yoke 110 . An input shaft is inserted into the inside of the yoke 110 . Also, the first magnet 120 may be disposed outside the yoke 110 . The first magnet 120 may be adhesively fixed or press-fitted to the outer circumferential surface of the yoke 110 .

The stator 200 is disposed outside the rotor 100. The stator 200 may include a stator ring 210 , a mold member 220 , and a holder 230 . A pair of stator rings 210 may be arranged facing each other. Also, the two stator rings 210 may be fixed to upper and lower sides of the mold member 220, respectively. The holder 230 is coupled to the mold member 220 . Holder 230 may be connected to the output shaft of the steering shaft. Here, the output shaft may be a steering shaft connected to a wheel-side power transmission component. Therefore, the stator 200 is connected to the output shaft and rotates together with the output shaft.

Meanwhile, the stator 200 may be provided with a collector disposed adjacent to the stator ring 210 to collect the amount of magnetization of the stator 200 .

3 is a side view of the circuit board shown in FIG. 2;

As shown in FIGS. 2 and 3 , the circuit board 300 has a first Hall sensor 500 and a second Hall sensor 600 disposed thereon.

The first cover 400 may include a 1-1st cover 410 and a 1-2nd cover 420 . The 1-1 cover 410 and the 1-2 cover 420 are disposed facing each other, and a space for accommodating the stator 200 may be provided therein. A circuit board 300 is disposed between the 1-1 cover 410 and the 1-2 cover 420 . The 1-1 cover 410 may include a first hole 411 through which the rotor 100 passes. Also, the 1-2nd cover 420 may include a second hole 421 through which the stator 200 passes.

Referring to FIG. 3 , the circuit board 300 may include a first surface 310 facing the 1-1 cover 410 and a second surface 320 facing the 1-2 cover 420. there is. A first hall sensor 500 may be disposed on the first surface 310 . A second hall sensor 600 may be disposed on the second surface 320 .

The first hall sensor 500 detects the amount of magnetization of the stator 200 generated by electrical interaction between the first magnet 120 of the rotor 100 and the stator 200 . The first hall sensor 500 may be disposed on the circuit board 300 . Specifically, the first Hall sensor 500 is disposed between the two collectors and detects the amount of magnetization magnetized by the interaction between the stator ring 210 and the first magnet 120 .

The rotor 100, the stator 200, and the first hall sensor 500 are components for measuring torque. Due to the difference between the rotation amount of the input shaft and the output shaft, twist occurs in the torsion bar of the input shaft and the output shaft. When torsion occurs, the rotation amount of the first magnet 120 of the rotor 100 and the rotation amount of the stator 200 are different. Accordingly, a change in the amount of magnetization occurs because the opposing surfaces of the first magnet 120 and the stator ring 210 are different. The first hall sensor 500 may detect the change in magnetization amount and measure the torque applied to the steering shaft.

The second Hall sensor 600 can calculate the angular acceleration of the output shaft by outputting a detection signal every 360° whenever it is adjacent to the second magnet 800 disposed on the magnet seating member 700.

The magnet seating member 700 has a ring shape, and a hole 710 through which the stator 200 passes is provided.

4 is a side view of the magnet seating member shown in FIG. 2;

Referring to FIG. 4 , the magnet mounting member 700 has a first surface 710 facing the first cover 400 and a second surface facing the second cover 900 based on the axial direction C of the rotating shaft. It may include face 720 . The second magnet 800 may be disposed on the second surface 720 facing the second cover 900 . The magnet seating member 700 is coupled to the holder 230 of the stator 200 and rotates together when the output shaft rotates.

The second magnet 800 is disposed on the magnet mounting member 700 . The second magnet 800 may be inserted molded or adhesively fixed to the magnet seating member 700 . The second magnet 800 rotates together with the magnet mounting member 700 when the output shaft rotates. Accordingly, as the output shaft rotates, the second magnet 800 periodically repeats a state of approaching and moving away from the second hall sensor 600 .

The second cover 900 covers the magnet seating member 700 . The second cover 900 is coupled to the first cover 400 . The second cover 900 is made of a metal material. This is to guide the flux generated in the second magnet 800 to the second cover 900 side. Since the flux generated in the second magnet 800 is restricted from flowing to the first magnet 120 by the second cover 900, the sensor assembly according to the embodiment has a separate shielding plate to avoid magnetic field interference. no need to install

5 is a view showing the 1-2 cover in FIG. 2, FIG. 6 is a view showing the hall sensor housing of the 1-2 cover, and FIG. 7 is a bottom view of the 1-2 cover.

Referring to FIGS. 5 and 6 , the 1-2nd cover 420 may include a hall sensor housing 422 and an accommodating portion 423 .

The hall sensor housing 422 protrudes from the outer surface of the 1-2nd cover 420 . The hall sensor housing 422 is disposed adjacent to the accommodating part 423 . The second hall sensor 600 is located inside the hall sensor housing 422. This hall sensor housing 422 serves to fix the position of the second hall sensor 600. The hall sensor housing 422 has a slot 422a accommodating the second hall sensor 600 therein, and has an open surface open toward the accommodating portion 423 . In addition, a stopper 422b may protrude from the entrance of the open surface of the hall sensor housing 422 to prevent the second hall sensor 600 from escaping through the open surface. As shown in FIG. 7 , the second hall sensor 600 may be disposed in the slot 422a through the inlet 422c disposed on the bottom surface of the 1-2nd cover 420 .

The accommodating portion 423 may be disposed around the second hole 421 in a concave shape on the outer surface of the 1-2nd cover 420 . The accommodating portion 423 is a place where the magnet seating member 700 is accommodated therein.

Meanwhile, the 1-2nd cover 420 may include a fourth coupling part 424 . The fourth coupling part 424 is coupled to the second cover 900 . A plurality of fourth coupling parts 424 may be disposed along the circumference of the accommodating part 423 . The fourth coupling part 424 may be a fastening protrusion. In addition, a fastening portion 425 for coupling with the 1-1 cover 410 may be provided around the 1-2 cover 420 .

8 is a view showing a magnet seating member, and FIG. 9 is a view showing a coupled state between a stator mold member and a magnet seating member.

Referring to FIGS. 8 and 9 , the magnet seating member 700 may include a first coupling portion 720 protruding from an inner circumferential surface. When the magnet seating member 700 is coupled to the mold member 220 of the stator 200, the first coupling part 720 may be coupled to the mold member 220 in a direction perpendicular to the axial direction of the rotation shaft. At this time, a second coupling portion 221 coupled to the first coupling portion 720 may be disposed on an outer circumferential surface of the mold member 220 . The first coupling portion 720 may be a plurality of protruding protrusions, and the second coupling portion 221 may be a plurality of grooves into which the first coupling portion 720 is inserted.

When the magnet seating member 700 is coupled to the mold member 220 of the stator 200, the first coupling portion 720 and the second coupling portion 221 are coupled in a direction perpendicular to the axial direction of the rotation shaft. , the thickness of the entire sensor assembly can be reduced. In other words, when the first coupling part 720 and the second coupling part 221 are coupled in the axial direction of the rotation axis, a coupling space is required in the direction of the rotation axis. This coupling space is a factor that increases the thickness of the entire sensor assembly. On the other hand, since the magnet mounting member 700 of the sensor assembly according to the embodiment and the mold member 220 of the stator 200 are coupled in a direction perpendicular to the axial direction of the rotation axis, the coupling space disposed in the direction of the rotation axis can be excluded.

10 is a view showing a second cover, and FIG. 11 is a view showing a magnet mounting member included in the second cover.

Referring to FIGS. 10 and 11 , the second cover 900 may include a top plate 910 and a side plate 920 . The top plate 910 has a disk shape, and a through hole 911 through which the holder 230 of the stator 200 passes is disposed at the center. The side plate 920 is disposed along the circumference of the top plate 910 and bent downward to the top plate 910 . When the second cover 900 is coupled to the first cover 400, the side plate 920 is bent and extended in the direction of the rotational axis in the top plate 910. As shown in FIG. 10 , the inner diameter R1 of the side plate 920 is designed to be at least larger than the outer diameter R2 of the magnet mounting member 700 . This is for the side plate 920 to be disposed between the magnet mounting member 700 and the hall sensor housing 422 based on a direction perpendicular to the direction of the rotation axis.

Meanwhile, a third coupling part 922 may be disposed around the side plate 920 . The third coupling portion 922 is coupled to the fourth coupling portion 424 of the first-second cover 420 to couple the second cover 900 to the second cover 400 . The third coupling part 922 may be a fastening flange protruding from the side plate 920 and including a fastening hole. A plurality of third coupling parts 922 may be disposed. Also, some of the plurality of third coupling parts 922 may be disposed adjacent to the groove 921 .

12 is a diagram illustrating a side plate disposed between a second magnet and a second Hall sensor.

Referring to FIGS. 2 and 12 , the side plate 920 is disposed between the magnet mounting member 700 and the hall sensor housing 422 . Thus, the side plate 920 covers the side of the second magnet 800 disposed on the magnet mounting member 700 . Also, the side plate 920 may include a groove 921 . The groove 921 is formed by cutting a part of the side plate 920, and has a structure that communicates the inside and outside of the side plate 920. This groove 921 is aligned with the second Hall sensor 600. Specifically, when the second cover 900 is coupled to the first cover 400, the groove 921 is aligned with the hall sensor housing 112 in the direction of rotation of the rotation shaft. In this case, the side plate 920 covers the side of the second magnet 800 to cover between the second magnet 800 and the second Hall sensor 600, and the second magnet 800 and the second hall sensor 600 are connected through the groove 921. This is to face the Hall sensor 600.

Along with the rotation of the output shaft, the second magnet 800 rotates. As the second magnet 800 rotates, the second magnet 800 periodically approaches or moves away from the second Hall sensor 600 . Through this, the second Hall sensor 600 can generate a detection signal every 360° period.

13 is a graph showing flux due to the second cover.

Referring to FIG. 12 in a state where there is no shielding structure between the first magnet 120 and the second magnet 800, the flux generated by the rotation of the second magnet 800 may ), it can be confirmed that

14 is a table comparing the torque output change amount, and FIG. 15 is a graph showing the torque output change amount.

A of FIGS. 14 and 15 is a sensor assembly with a shielding plate installed, B of FIGS. 14 and 15 is a sensor assembly without a shielding plate, and C of FIGS. 14 and 15 is a metal second cover (900 ) is the installed sensor assembly.

As shown in FIGS. 14 and 15 , in the case of the sensor assembly (B) without the shield plate, it can be seen that the torque output change is greatly reduced in the range of the angle from 40° to 160°. This is because magnetic field interference occurs.

On the other hand, in the case of “C” where the second cover 900 made of metal is installed, it can be confirmed that the amount of change in torque output is detected similarly to the case of “A” where the shielding plate is installed. Therefore, in the case of the sensor assembly according to the embodiment, it can be confirmed that the magnetic field interference is effectively shielded without installing a separate shielding plate.

Above, a sensor assembly according to one preferred embodiment of the present invention and a steering device including the same were examined in detail with reference to the accompanying drawings.

One embodiment of the present invention described above should be understood as illustrative in all respects and not limiting, and the scope of the present invention will be indicated by the claims to be described later rather than the detailed description above. And it should be construed that all changes or transformable forms derived from the meaning and scope of the claims as well as their equivalent concepts are included in the scope of the present invention.

0: sensor assembly
100: rotor
110: yoke
120: first magnet
200: stator
210: Statoring
220: mold member
221: second coupling part
230: holder
300: circuit board
310: first side
320: second side
400: first cover
410: 1-1 cover
411: first hole
420: first-second cover
421: second hole
422: hall sensor housing
423: receiving part
424: fourth coupling part
425: fastening part
500: first hall sensor
600: second hall sensor
700: magnet mounting member
710: hall
720: first coupling part
800: second magnet
900: second cover
910: top plate
920: side plate
921: home
922: third coupling part

Claims (19)

A rotor having a first magnet disposed on an outer circumferential surface of the rotor;
a stator disposed outside the rotor;
circuit board;
a first cover accommodating the circuit board;
a first hall sensor and a second hall sensor disposed on the circuit board;
a magnet mounting member coupled to the stator;
a second magnet coupled to the magnet mounting member; and
And a second cover made of a metal material coupled to the first cover,
The magnet seating member and the second magnet are disposed between a first cover and a second cover,
The second cover includes a top plate having a through hole and a side plate extending in a rotational axis direction from the top plate,
The side plate is a sensing assembly comprising a groove formed at a position corresponding to the hall sensor. According to claim 1,
The first Hall sensor senses the magnetic flux of the stator, and the second Hall sensor senses the magnetic flux of the second magnet. According to claim 1,
The first cover includes a 1-1 cover and a 1-2 cover,
The 1-1 cover includes a first hole through which the rotor passes,
The 1-2 cover includes a second hole through which the stator passes,
The circuit board is a sensing assembly disposed between the 1-1 cover and the 1-2 cover. According to claim 3,
The substrate includes a first surface facing the 1-1 cover and a second surface facing the 1-2 cover,
The first Hall sensor is disposed on the first surface, and the second Hall sensor is disposed on the second surface. According to claim 1,
Based on a direction perpendicular to the axial direction of the rotation shaft, the side plate is disposed between the second magnet and the second Hall sensor. According to claim 1.
The first cover protrudes from an outer surface and includes a hall sensor housing in which the second hall sensor is located. According to claim 6,
The hall sensor housing,
A sensing assembly comprising a slot accommodating the second hall sensor, wherein the slot has an open surface. According to claim 7,
The slot includes a stopper protruding from an inlet on the open surface. According to claim 1,
The first cover is disposed on an outer surface and is concavely disposed along a circumference of the first hole through which the stator passes, and includes a receiving portion in which the magnet seating member is seated. According to claim 1,
The magnet seating member includes a first surface facing the second cover and a second surface facing the first cover,
The second magnet is disposed on the first surface of the sensing assembly. According to claim 1,
The magnet mounting member includes a first coupling portion coupled to the stator in a direction perpendicular to an axial direction of a rotation shaft. According to claim 11,
The stator includes two stator rings and a mold member fixing the two stator rings,
wherein the mold member includes a second coupling portion coupled to the first coupling portion and coupled to a second coupling portion. According to claim 12,
The first coupling part is at least one protrusion protruding from the inner circumferential surface of the magnet seating member,
The second coupling portion is disposed on an outer circumferential surface of the stator holder and is a groove into which the first coupling portion is inserted. According to claim 1,
The first cover includes a hall sensor housing protruding from an outer surface and in which the second hall sensor is located,
The sensing assembly of claim 1 , wherein the groove of the side plate of the second cover and the hall sensor housing are aligned based on a rotation direction of a rotation shaft. According to claim 1,
An inner diameter of the side plate of the second cover is larger than an outer diameter of the magnet mounting member. According to claim 1,
The second cover includes a hole through which the stator passes. According to claim 1,
The second cover includes a third coupling part,
The sensing assembly of claim 1 , wherein the first cover includes a fourth coupling portion coupled to the third coupling portion. According to claim 17,
The third coupling portion is a fastening flange protruding from the side plate and including a fastening hole,
The fourth coupling part is a fastening protrusion that protrudes from the first cover and is inserted into the fastening hole. steering shaft;
A sensing assembly coupled to the steering shaft;
The sensing assembly,
A rotor having a first magnet disposed on an outer circumferential surface of the rotor;
a stator disposed outside the rotor;
circuit board;
a first cover accommodating the circuit board;
a first hall sensor and a second hall sensor disposed on the circuit board;
a magnet mounting member coupled to the stator;
a second magnet coupled to the magnet mounting member; and
And a second cover made of a metal material coupled to the first cover,
The magnet seating member and the second magnet are disposed between a first cover and a second cover,
The second cover includes a top plate having a through hole and a side plate extending in a rotational axis direction from the top plate,
The side plate includes a groove formed at a position corresponding to the hall sensor.

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