KR20200093259A - Apparatus for sensing - Google Patents

Abstract

The present invention relates to a sensing device capable of avoiding magnetic field interference caused by an external magnetic field. The sensing device according to the embodiment includes a stator comprising a stator tooth and a rotor including a magnet. The stator tooth includes a first stator tooth and a second stator tooth disposed within the first stator tooth, the first stator tooth includes a plurality of first teeth, the second stator tooth includes a plurality of second teeth, and the first teeth overlap the second teeth in a radial direction at the center of the stator. The sensing device also includes a sensor disposed between a first body of the first stator tooth and a second body of the second stator tooth, and a circuit board connected to the sensor, wherein at least one of the first body and the second body includes a protrusion protruding toward the sensor.

Description

Sensing device {APPARATUS FOR SENSING}

The embodiment relates to a sensing device.

The power steering system (Electronic Power System, hereinafter referred to as'EPS') drives the motor in the electronic control unit according to the operating conditions to ensure turning stability and provides quick resilience, thereby helping the driver to be safe. Enable driving.

The EPS includes a sensor assembly that measures torque, steering angle, etc. of the steering shaft to provide adequate torque. The sensor assembly may include a torque sensor measuring torque applied to the steering axis and an index sensor measuring angular acceleration of the steering axis. In addition, the steering shaft may include an input shaft connected to the handle, an output shaft connected to the power transmission configuration of the wheel side, and a torsion bar connecting the input shaft and the output shaft.

The torque sensor measures the degree of twist of the torsion bar to measure the torque applied to the steering shaft. And the index sensor detects the rotation of the output shaft and measures the angular acceleration of the steering shaft. In the sensor assembly, the torque sensor and the index sensor may be disposed together and integrally configured.

The torque sensor may include a housing, a rotor, a stator including a stator tooth, and a collector, to measure the torque.

At this time, the torque sensor is a magnetic type structure, and may be provided in a structure in which the collector is disposed outside the stator tooth.

However, when an external magnetic field is generated, since the collector acts as a passage for the external magnetic field in the structure, there is a problem influencing the magnetic flux value of Hall IC. Accordingly, a change occurs in the output value of the torque sensor, which causes a problem that it is impossible to accurately measure the twisting degree of the torsion bar.

Particularly, as the number of electric boots in a vehicle increases, the torque sensor may be affected by an external magnetic field, so a torque sensor that is not affected by the external magnetic field is requested.

An object of the embodiment is to provide a sensing device capable of avoiding magnetic field interference due to an external magnetic field generated externally when measuring torque.

An object of the embodiment is to provide a sensing device that reduces the number of collectors and simplifies the structure.

An object of the embodiment is to provide a sensor device that can prevent an external magnetic field from flowing into the collector and causing magnetic field interference.

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 following description.

The subject, according to an embodiment, includes a stator including a stator tooth and a rotor including a magnet, wherein the stator tooth includes a first stator tooth and a second stator tooth disposed in the first stator tooth, the The first stator tooth includes a plurality of first teeth, the second stator tooth includes a plurality of second teeth, and the first tooth overlaps radially from the center of the second tooth and the stator, And a sensor disposed between the first body of the first stator tooth and the second body of the second stator tooth and a circuit board connected to the sensor, wherein at least one of the first body and the second body is the sensor. It may provide a sensing device including a protrusion projecting toward the.

The subject includes, according to an embodiment, a stator including a stator tooth and a rotor including a magnet, wherein the stator tooth includes a first stator tooth having a first radius and a second stator tooth having a second radius. , The first stator tooth includes a plurality of first teeth, the second stator tooth includes a plurality of second teeth, and the first tooth overlaps radially from the center of the second tooth and the stator. And a circuit board connected to the sensor and a sensor disposed between the first body of the first stator tooth and the second body of the second stator tooth, wherein at least one of the first body and the second body is A sensing device including a protrusion projecting toward the sensor may be provided.

The subject includes, according to an embodiment, a stator and a rotor at least partially disposed on the stator, wherein the stator includes a stator holder, a stator body coupled with the stator holder, a first stator tooth disposed on the stator body, and the And a second stator tooth having a radius greater than the first stator tooth, wherein the first stator tooth includes a first body and a plurality of first teeth connected to and spaced from the first body, and the second stator tooth. The tooth includes a second body and a plurality of second teeth connected to and spaced from the second body, the plurality of first teeth and the plurality of second teeth overlap in a radial direction, and the first body A sensing device including a sensor disposed between the second body and a circuit board connected to the sensor, wherein at least one of the first body and the second body includes a protrusion projecting toward the sensor. .

Preferably, the first body includes an annular first protrusion disposed on the first body and a second protrusion formed in the second body, and the inner diameter of the first protrusion is smaller than the inner diameter of the first body, and the The outer diameter of the second protrusion may be larger than the outer diameter of the second body.

Preferably, the thickness of the first body and the thickness of the first protrusion are the same, and the thickness of the second body and the thickness of the second protrusion may be the same.

Preferably, a collector may be disposed between the sensor and the first body, and between the sensor and the second body.

Preferably, the collector may include a collector body facing the sensor, a first extension portion extending from one side of the collector body, and a second extension portion extending from the other side of the collector body.

Preferably, the collector body includes a first collector body and a second collector body, and the first extension portion and the second extension portion may connect the first collector body and the second collector body, respectively.

Preferably, the protrusion may be disposed on any one of the first body and the second body.

Preferably, in the axial direction, the length of the protrusion may be at least greater than the length of the sensor.

In the sensing device according to the embodiment having the above-described configuration, a collector is disposed between a pair of stator teeth and a sensor is disposed between the collectors, thereby preventing magnetic field interference due to an external magnetic field generated externally when measuring torque. Or it can be minimized.

In addition, the first tooth of the first stator tooth and the second tooth of the second stator tooth which are arranged to be spaced apart from each other in the radial direction are disposed to overlap, and the magnet is rotated between the first tooth and the second tooth, thereby The first tooth and the second tooth may be charged with different poles.

In addition, there is an advantage that can increase the size of the collected flux.

In addition, there is an advantage that the stator tooth can be easily coupled to the stator body.

In addition, there is an advantage that the collector can be easily coupled to the housing.

In addition, by removing the collector, there is an advantage of preventing an external magnetic field from flowing into the collector and generating magnetic field interference.

Various and beneficial advantages and effects of the embodiments are not limited to the above, and may be more easily understood in the process of describing specific embodiments of the embodiments.

1 is a perspective view showing a sensing device according to an embodiment,
Figure 2 is an exploded perspective view showing the sensing device shown in Figure 1,
3 is a cross-sectional perspective view of the sensing device shown based on AA of FIG. 1.
4 is a perspective view showing a stator of a sensing device according to an embodiment,
Figure 5 is an exploded perspective view showing the stator of the sensing device according to the embodiment,
6 is a cross-sectional view showing a stator of a sensing device according to an embodiment,
7 is a perspective view showing a stator body of the stator,
8 is a plan view showing the stator body of the stator,
9 is a cross-sectional view showing the stator body of the stator,
10 is a side view showing the first stator tooth,
11 is a side view showing the second stator tooth,
12 is a plan view showing a first stator tooth and a second stator tooth and a magnet,
13 is a view showing a first pole and a second pole of the magnet,
14 is a view showing a second angle,
15 is a view showing a third angle,
FIG. 16 is a graph showing the first, second, and third angles of contrast, and
17 is an exploded perspective view of the rotor,
18 is a view showing a magnet,
19 is a plane of the magnet,
20 is a perspective view showing the arrangement of the magnets for the first stator tooth and the second stator tooth,
21 is a view showing a first stator tooth and a second stator tooth,
22 and 23 are cross-sectional side views of a first stator tooth and a second stator tooth and a sensor based on AA in FIG. 21,
24 is a view showing a modification of the first stator tooth and a modification of the second stator tooth,
FIG. 25 is a side sectional view of a sensor and collector, a modification of the first stator tooth and a modification of the second stator tooth based on the BB of FIG. 22,
26 is a view showing a collector,
27 is a view showing a collector disposed between the first stator tooth and the second stator tooth,
28 is a view showing a circuit board,
29 is a sectional view showing a connector housing and a pin of the housing,
30 is a view showing a first member and a second member,
31 is a view showing a first member and a second member installed on the stator holder,
32 is a view showing a first gear and a second gear engaged with the main gear,
34 is a view showing the direction of the external magnetic field with respect to the stator tooth,
34 is a view showing a state of avoidance of a sensor against an external magnetic field having z-direction;
35 is a view showing a state of avoidance of the first and second stator teeth for an external magnetic field having a y'-axis directionality;
36 is a graph comparing the comparative example and the embodiment with respect to the amount of angular change corresponding to the external magnetic field in the z-axis direction;
37 is a graph comparing the comparative example and the example with respect to the angular change amount corresponding to the external magnetic field in the y'axis direction.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

However, the technical spirit of the present invention is not limited to some embodiments described, but may be implemented in various different forms, and within the technical spirit scope of the present invention, one or more of its components between embodiments may be selectively selected. It can be used by bonding and substitution.

In addition, terms (including technical and scientific terms) used in the embodiments of the present invention, unless specifically defined and described, can be generally understood by those skilled in the art to which the present invention pertains. It can be interpreted as meaning, and commonly used terms, such as predefined terms, may interpret the meaning in consideration of the contextual meaning of the related technology.

In addition, the terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention.

In the present specification, a singular form may also include a plural form unless specifically stated in the phrase, and is combined with A, B, and C when described as "at least one (or more than one) of A and B, C". It can contain one or more of all possible combinations.

In addition, in describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), and (b) may be used.

These terms are only for distinguishing the component from other components, and the term is not limited to the nature, order, or order of the component.

And, when a component is described as being'connected','coupled' or'connected' to another component, the component is not only directly connected, coupled or connected to the other component, but also to the component It may also include the case of'connected','coupled' or'connected' by another component between the other components.

Further, when described as being formed or disposed in the "top (top) or bottom (bottom)" of each component, the top (top) or bottom (bottom) is one as well as when the two components are in direct contact with each other It also includes a case in which another component described above is formed or disposed between two components. In addition, when expressed as "up (up) or down (down)", it may include the meaning of the downward direction as well as the upward direction based on one component.

Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings, but the same or corresponding components are assigned the same reference numbers regardless of reference numerals, and redundant descriptions thereof will be omitted.

1 is a perspective view showing a sensing device according to an embodiment, FIG. 2 is an exploded perspective view showing the sensing device shown in FIG. 1, and FIG. 3 is a cross-sectional perspective view of the sensing device shown based on A-A of FIG. 1. 1 and 2, the z-direction means the axial direction, and the y-direction means the radial direction. And, the axial direction and the radial direction are perpendicular to each other.

1 to 3, the sensing device 1 according to the embodiment is electrically connected to the stator 100, the rotor 200, the sensor 500, and the sensor 500, which are partially disposed in the stator 100. It may include a connected circuit board 600, a housing 700 to which the circuit board 600 is coupled, a first member 800 and a second member 900.

Here, the stator 100 is connected to the output shaft (not shown), and the rotor 200 in which at least a portion of the stator 100 is rotatably disposed may be connected to the input shaft (not shown), but is not limited thereto.

At this time, the rotor 200 may be rotatably disposed with respect to the stator 100. Hereinafter, the inner side means a direction disposed toward the center C based on the radial direction, and the outer side may mean a direction opposite to the inner side.

4 is a perspective view showing a stator of a sensing device according to an embodiment, FIG. 5 is an exploded perspective view showing a stator of a sensing device according to an embodiment, and FIG. 6 is a cross-sectional view showing a stator of a sensing device according to an embodiment.

The stator 100 may be connected to an output shaft (not shown) of the steering shaft.

4 to 6, the stator 100 may include a stator holder 110, a stator body 120, a first stator tooth 130 and a second stator tooth 140.

The stator holder 110 may be connected to the output shaft of the electric steering device. Accordingly, the stator holder 110 may rotate in conjunction with rotation of the output shaft. The stator holder 110 may be formed in a cylindrical shape. In addition, the stator holder 110 may be formed of a metal material, but is not limited thereto, and the stator holder 110 may use other materials in consideration of a certain strength or higher so that the output shaft can be fixed. to be.

The stator holder 110 may include a groove 111. The groove 111 is formed concave on the outer circumferential surface of the stator holder 110. The groove 111 is disposed along the outer circumferential surface of the stator holder 110. A fixing member (900 in FIG. 2) is inserted into the groove 111.

The stator holder 110 may be coupled to the stator body 120.

The stator body 120 may be disposed at one end of the stator holder 110. The stator body 120 may be combined with the stator holder 110 by an insert injection method using synthetic resin such as resin. The main gear 121 may be formed on the outer circumferential surface of the stator body 120. The main gear 121 transmits the rotational force of the stator 120 to the first gear 1100 and the second gear 1200.

The first stator tooth 130 and the second stator tooth 140 may be disposed to be spaced apart from each other in the radial direction. In addition, the first stator tooth 130 and the second stator tooth 140 may be fixed to the stator body 120. The first stator tooth 130 includes a first body 131 and a first tooth 132. The second stator tooth 140 includes a second body 141 and a second tooth 142.

7 is a perspective view showing the stator body of the stator, FIG. 8 is a plan view showing the stator body of the stator, and FIG. 9 is a cross-sectional view showing the stator body of the stator.

7 to 9, the stator body 120 includes an inner part 121, an outer part 122 and a plate 123. The inner part 121 and the outer part 122 are cylindrical. The outer portion 122 is spaced apart from the outer side of the inner portion 121 based on the radial direction. The plate 123 connects the inner part 121 and the outer part 122. The inner portion 121, the outer portion 122 and the plate 123 may be integral. The stator holder 110 may be coupled to the inner side of the inner portion 121. A space S may be formed between the outer part 122 and the inner part 121. The plate 123 may be formed in a plate shape. The plate 123 may be disposed between the inner portion 121 and the outer portion 122.

As illustrated in FIG. 9, the space S may be divided into a first space S1 and a second space S2 by a plate 123. The magnet 230 may be disposed in the first space S1, and the sensor 500 may be disposed in the second space S2. The plate 123 is a horizontal horizontal line L1 that can be disposed below the reference line L1, and is a virtual horizontal line passing through the center of the outer portion 122 based on the axial direction.

Meanwhile, the plate 123 may include a first hole 124 and a second hole 125. The first hole 124 and the second hole 125 are for the arrangement of the first stator tooth 130 and the second stator tooth 140.

Referring to FIG. 6, a first body 131 and a second body 141 may be disposed in the first space S1. The first tooth 132 and the second tooth 142 may be disposed in the second space S2.

A plurality of first holes 124 may be spaced apart from each other along the circumferential direction. Then, the first tooth 132 passes through the first hole 124 and is disposed in the second space S2. At this time, the number of first holes 124 is the same as the number of first teeth 132. The first hole 124 may be disposed adjacent to the inner circumferential surface of the outer portion 122. As illustrated in FIG. 8, the first hole 124 may be formed in the plate 123 so as to contact the inner circumferential surface of the outer portion 122.

A plurality of second holes 125 may be spaced apart from each other along the circumferential direction. At this time, the second hole 125 based on the radial direction may be spaced apart from the inside of the first hole 124. Then, the second tooth 142 penetrates the second hole 125 and is disposed in the second space S2. At this time, the number of the second holes 125 is the same as the number of the second teeth 142 of the second stator teeth 140. The second hole 125 may be disposed adjacent to the outer peripheral surface of the inner portion 121. As illustrated in FIG. 8, the second hole 125 may be formed in the plate 123 so as to contact the outer circumferential surface of the inner portion 121.

The first stator tooth 130 and the second stator tooth 140 may be disposed between the outer circumferential surface of the inner portion 121 of the stator body 120 and the inner circumferential surface of the outer portion 122. Here, the first stator tooth 130 and the second stator tooth 140 may be formed of a metal material for charging by rotation of the magnet 230.

In addition, the first stator tooth 130 may be fixed to the inner circumferential surface of the outer portion 122 by an adhesive member (not shown) such as a bond, and the second stator tooth 140 is an adhesive member (not shown) such as a bond. It can be fixed to the outer peripheral surface of the inner portion 121, but is not limited thereto. For example, each of the first stator tooth 130 and the second stator tooth 140 may be fixed to the stator body 120 through a fastening member (not shown) or a caulking method.

The boss 126 extends and is disposed below the partition wall 123. The side wall of the boss 126 and the outer portion 122 are spaced apart to form a first slot U1. The first tooth 132 is inserted into the first slot U1 and penetrates the first hole 124 to be located in the second space portion S2. And the side wall of the boss 126 and the inner part 121 are spaced apart to form a second slot U2. The second tooth 142 is inserted into the second slot U2 and penetrates the second hole 125 to be located in the second space portion S2.

The first slot U1 guides the first tooth 132 to the first hole 124 in the process of coupling the first stator tooth 130 to the stator body 120 to facilitate the coupling.

The second slot U2 guides the first tooth 132 to the second hole 125 in the process of coupling the second stator tooth 130 to the stator body 120 to facilitate the coupling.

10 is a side view showing the first stator tooth, and FIG. 11 is a side view showing the second stator tooth.

5 and 10, the first stator tooth 130 is a plurality of first teeth 132 that are spaced apart from each other in the ring-shaped first body 131 and the first body 131 and protrude in the axial direction. It may include. For example, the first teeth 132 may be disposed to be spaced apart from each other along the circumferential direction, and may extend upward from an upper side of the first body 131. The first body 131 and the plurality of first teeth 132 may be integrally formed. Here, the first body 131 may be referred to as a first tooth body.

The first tooth 132 may be formed in a shape of a lower light negotiation. For example, when viewed in the radial direction, the width of the lower side of the first tooth 132 may be greater than the width of the upper side. 10, the first tooth 132 may be formed in a trapezoidal shape.

Then, as the first tooth 132 penetrates the first hole 124, the upper surface of the first body 131 may contact the lower surface of the plate 123.

5 and 11, the second stator tooth 140 is a ring-shaped second body 141 and a plurality of second teeth 142 spaced apart from the second body 141 and protruding in the axial direction. ). For example, the second teeth 142 may be arranged to be spaced apart from each other along the circumferential direction, and may extend upward from the upper side of the second teeth 142. The second body 141 and the plurality of second teeth 142 may be integrally formed. Here, the second body 141 may be referred to as a second tooth body.

The second tooth 142 may be formed in a shape of a lower light negotiation. For example, when viewed in the radial direction, the width of the lower side of the second tooth 142 may be greater than the width of the upper side. As illustrated in FIG. 11, the second tooth 142 may be formed in a trapezoidal shape.

Then, as the second tooth 142 penetrates the second hole 125, the upper surface of the second body 141 may contact the lower surface of the plate 123.

Referring to FIG. 10, the height H1 of the first body 131 based on the upper surface 131a of the first body 131 is smaller than the height H2 of the first tooth 132. And, referring to FIG. 11, the height H3 of the second body 141 based on the upper surface 141a of the second body 141 is smaller than the height H4 of the second tooth 142. In addition, the height H1 of the first body 131 is the same as the height H3 of the second body 141, and the height H2 of the first tooth 132 is the height of the second tooth 142 ( H4). However, the present invention is not limited thereto, and the height H2 of the first tooth 132 may be different from the height H4 of the second tooth 142.

12 is a plan view showing the first stator tooth and the second stator tooth and the magnet.

Referring to FIG. 12, the first stator tooth 130 is disposed outside the second stator tooth 140. Here, the first stator tooth 130 based on the center C may be formed to have a first radius R1, and the second stator tooth 140 may be formed to a second radius R2. The first radius R1 is greater than the second radius R2.

When viewed in the radial direction (y direction), the first tooth 132 and the second tooth 142 may be disposed to overlap in the radial direction. The arrangement of the first tooth 132 and the second tooth 142 has an effect of reducing magnetic flux leakage.

13 is a view showing a first pole and a second pole of the magnet.

Referring to FIG. 13, the magnet includes a first pole 230A and a second pole 230B. The first pole 230A and the second pole 230B may be alternately arranged along the circumferential direction of the magnet.

The first pole 230A and the second pole 230B may include an N-pole region NA and an S-pole region SA, respectively. The first pole 230A and the second pole 230B may have a multi-layer structure in which the N-pole region NA and the S-pole region SA are respectively divided into inner and outer sides.

In the first pole 230A, the N-pole region NA may be disposed relatively outside, and the S-pole region SA may be disposed inside the N-pole region NA. In the second pole 230B, the N-pole region NA may be disposed relatively inside, and the S-pole region SA may be disposed outside the N-pole region NA.

The N-pole region NA of the first pole 230A and the S-pole region SA of the second pole 230B are disposed adjacent to each other. The S-pole region SA of the first pole 230A and the N-pole region NA of the second pole 230B are disposed adjacent to each other.

When the magnet 230 rotates, and the first tooth 132 is charged with the S-pole region SA as the S-pole, the second tooth 142 is charged with the N-pole because the N-pole region NA is near. do. Alternatively, when the magnet 230 rotates, and the first tooth 132 is charged with the N-pole region NA close to the N-pole, the second tooth 142 moves to the S-pole because the S-pole region SA approaches. It is electrified. Accordingly, the sensor 500 may measure the angle through a magnetic field applied through the first protrusion (132b in FIG. 22) or the second protrusion (142b in FIG. 22) or the collector (300 in FIG. 26).

In the sensing device according to the embodiment, the first tooth 132 and the second tooth 142 overlap in the radial direction. Both ends of the second tooth 142 may overlap the first tooth 132. For example, in designing the position and size of the first tooth 132 and the second tooth 142, the first angle Θ1, Θ1, the second angle Θ2, and the third angle Θ3 It can be the same.

The first angle Θ1 represents an angle formed by both ends of the first pole 230A based on the stator center C. For example, when eight first poles 230A and eight second poles 230B are present, the first angle Θ1 may be 22.5°.

14 is a view showing a second angle Θ2, and FIG. 15 is a view showing a third angle Θ3.

Referring to FIG. 14, the second angle θ2 indicates an angle formed by both ends P1 of the first tooth 132 based on the stator center C. In the axial direction, reference points G defining both ends P1 of the first tooth 132 are as follows. The reference point (G) is a first tooth 132 when the body 231 of the magnet 230 is disposed facing each other, the first corresponding to the midpoint of the height (H1) of the body 231 of the magnet 230 Corresponds to the point of the tooth (132). The height H1 of the body 231 of the magnet 230 means a height formed by the upper surface 231a and the lower surface 231b of the magnet 230 based on the axial direction. The angle Θ4 between the first tooth 132 and the first tooth 132 at the reference point G may be the same as the second angle Θ2.

Referring to FIG. 15, the third angle θ3 refers to an angle formed by both ends P2 of the second tooth 142 based on the stator center C. In the axial direction, reference points G defining both ends P2 of the second tooth 142 are as follows. The reference point G is the second tooth 142 when the body 231 of the magnet 230 is disposed facing each other, the second corresponding to the midpoint of the height (H1) of the body 231 of the magnet 230 Corresponds to the point of the tooth (142). The angle Θ5 between the second tooth 142 and the second tooth 142 at the reference point G may be the same as the third angle Θ3.

FIG. 16 is a graph showing a flux compared to a first angle Θ1, a second angle Θ2, and a third angle Θ3.

Referring to FIG. 16, in a state in which the second angle Θ2 and the third angle Θ3 are set to the same, the second angle Θ2 and the third angle Θ3 are closer to the first angle Θ1 It can be seen that as the size of the flux increases, the size of the plus decreases as the second angle Θ2 and the third angle Θ3 move away from the first angle Θ1. When the size and position of the first tooth 132 and the second tooth 142 are aligned such that the second angle Θ2 and the third angle Θ3 are the same as the first angle Θ1, the first, It can be seen that the size of the 2 stator teeth 130 and 140 is the largest.

17 is an exploded perspective view of the rotor.

2 and 17, the rotor 200 may include a rotor holder 210, a rotor body 220, and a magnet 230. The rotor holder 210, the rotor body 220, and the magnet 230 may be integral.

The rotor holder 210 may be connected to an input shaft of an electric steering device. Accordingly, the rotor holder 210 can rotate in conjunction with the rotation of the input shaft. The rotor holder 210 may be formed in a cylindrical shape. And, the end of the rotor holder 210 may be coupled to the rotor body 220. The rotor holder 210 may be formed of a metal material, but is not necessarily limited thereto, and the rotor holder 210 may use other materials in consideration of a certain strength or higher so that the input shaft can be fixed.

It may include a projection 211 of the rotor holder 210. The protrusion 211 may be disposed to extend in the radial direction from the outer circumferential surface of the rotor holder 210.

The rotor body 220 is disposed on one side of the outer circumferential surface of the rotor holder 210. The rotor body 220 may be an annular member. A groove 221 may be disposed on the inner circumferential surface of the rotor body 220. The groove 221 is where the protrusion of the rotor holder 210 is inserted.

The magnet 230 is coupled to the rotor body 220. When the rotor 230 rotates, the magnet 230 rotates in conjunction.

18 is a view showing the magnet and FIG. 19 is a plan view of the magnet.

18 and 19, the magnet 230 may include a ring-shaped body 231 and a protrusion 232 protruding from an upper surface of the body 231. A plurality of protrusions 232 may be provided. The protrusion 232 may include a first part 232a and a second part 232b. The first part 232a protrudes upward from the upper surface of the body 231. The second part 232b may be disposed to protrude in the radial direction of the magnet 230 from the first part 232a. The second part 232b may protrude inward from the inner circumferential surface 231a of the body 231. The protrusion 232 is intended to increase the binding force with the rotor body 231. The first part 232a prevents the rotor body 231 and the magnet 230 from slipping in the rotational direction, and the second part 232b shows that the magnet 230 other than the rotor body 231 is separated in the axial direction. prevent.

20 is a perspective view showing the arrangement of the magnets for the first stator tooth and the second stator tooth.

Referring to FIG. 20, a magnet 230 is disposed between the first tooth 132 and the second tooth 142. The body 231 of the magnet 230 is disposed facing the first tooth 132 and the second tooth 142. The protrusion 232 of the magnet 230 is disposed above the first tooth 132 and the second tooth 142.

21 is a view showing a first stator tooth and a second stator tooth, and FIGS. 22 and 23 are cross-sectional side views of the first stator tooth, the second stator tooth, and the sensor based on A-A of FIG. 21.

The protrusion may be disposed on at least one of the first body 132 of the first stator tooth 130 and the second body 142 of the second stator tooth 140. The protrusion increases the amount of flux applied to the sensor 500 by reducing the air gap of the sensor 500 and the first body 132 or the air gap of the sensor 500 and the second body 142.

The protrusion may include a first protrusion 132b and a second protrusion 142b.

The first protrusion 132b may be disposed on the first body 132. The first protruding portion 132b may be an annular member in which a lower portion of the first body 132 is bent inward and protrudes. The first body 132 is divided into a first protrusion 132b and an upper portion 132a disposed on an upper side of the first protrusion 132b, and the first protrusion 132b and the upper portion 132a are stepped. .

The second protruding portion 142b may be disposed on the second body 142, and the second protruding portion 142b may be an annular member in which the lower portion of the second body 142 is bent outwardly and protrudes. The second body 142 is divided into a second protrusion 142b and an upper portion 142a disposed above the second protrusion 142b, and the second protrusion 142b and the upper portion 142a are in a stepped shape. .

Referring to FIG. 23, the inner diameter D1 of the first protrusion 132b is smaller than the inner diameter D2 of the first body 132, and the outer diameter D3 of the second protrusion 142b is the second body 142 It may be larger than the outer diameter (D4). The thickness t1 of the first body 132 and the thickness t2 of the first protrusion 132b may be the same. In addition, the thickness t3 of the second body 142 and the thickness t4 of the second protrusion 142b may be the same.

On the other hand, based on the axial direction, the length L1 of the first protrusion 132b and the length L2 of the second protrusion 142b are at least greater than the lengths L3 and L4 of the sensor 500, respectively. This is to effectively apply the flux to the sensor 500.

Table 1 below compares the fluxes of the comparative examples and the examples.

Flux amount (Gauss/Deg) Comparative Example 1 35 Comparative Example 2 20 Example 30

Comparative Example 1 is a sensing device in which two collectors are respectively disposed between the first stator tooth 130 and the sensor 500 and between the second stator tooth 140 and the sensor 500, and in Comparative Example 2, the protrusion The sensing device in which the collector is removed in the absence state, and the embodiment is the sensing device 1 in which the collector is removed in the state where the protrusions 132b and 142b are present.

Referring to Table 1, in the case of Comparative Example 2, it can be seen that the flux is relatively reduced compared to Comparative Example 1, whereas in Example, unlike Comparative Example 2, the flux is not significantly reduced compared to Comparative Example 1. Therefore, the embodiment has the advantage of removing the collector, simplifying the configuration of the sensing device, reducing the size of the sensing device, reducing the manufacturing process and manufacturing cost, and securing the performance of the sensing device.

24 is a view showing a modification of the first stator tooth and the second stator tooth, and FIG. 25 is a modification of the first stator tooth and the second stator tooth based on BB of FIG. 22. And a cross-sectional side view of the sensor and collector.

24 and 25, only one collector 300 is disposed between the first stator tooth 130 and the second stator tooth 140. In addition, in order to increase the flux applied to the sensor 500, a protrusion is disposed on one of the first body 132 of the first stator tooth 130 and the second body 142 of the second stator tooth 140.

For example, the second protrusion 142b may be disposed on the second body 142 and the protrusion may not be disposed on the first body 132. In addition, the collector 300 may be disposed between the sensor 500 and the second body 142. When the collector 300 is disposed inside the sensor 500 and disposed apart from the first stator tooth 130, it is less affected by an external magnetic field flowing from outside of the sensing device 1 based on the radial direction. There are advantages. In addition, since the second protrusion 142b is bent toward the outside, in the radial direction, the air gap between the second protrusion 142b and the rotating shaft (100 in FIG. 1) increases, and the agent is transmitted through the rotating shaft 100. 2 has the advantage of reducing the influence of the external magnetic field transmitted to the stator tooth 140.

Since one collector 300 is disposed between the sensor 500 and the second body 142, the configuration of the sensing device can be simplified and the size of the sensing device can be reduced compared to the case where two collectors are arranged. While reducing the process and manufacturing costs, there is an advantage to secure the performance of the sensing device.

26 is a view showing a collector, and FIG. 27 is a view showing a collector disposed between the first stator tooth and the second stator tooth.

2, 26 and 27, the collector 300 collects the flux of the stator 100. Here, the collector 300 may be formed of a metal material, and may be spaced apart from each other based on the radial direction.

The collector 300 may be an annular member. The collector 300 may include a first collector body 310, a second collector body 320, a first extension portion 330, and a second extension portion 340.

The first extension part 330 and the second extension part 340 connect the first collector body 310 and the second collector body 320, respectively. The first collector body 310 and the second collector body 320 may each include a flat surface, and the first extension portion 330 and the second extension portion 340 may each include a curved surface. The first collector body 310 and the second collector body 320 may be disposed to face each other.

When the collector 300 is made of two members separated from each other, depending on the inflow direction of the external magnetic field, the two members may be charged with different polarities to degrade the performance of the sensing device. Since the collector 300 of the sensing device according to the embodiment is made of a single member, there is an advantage that the problem is basically eliminated.

The sensor 500 detects a change in the magnetic field generated between the stator 100 and the rotor 200. The sensor 500 may be a Hall IC. The sensor 500 detects the magnetization amount of the stator 100 generated by the electrical interaction between the magnet 230 of the rotor 200 and the stator 100. Based on the detected magnetization amount, the sensing device 1 measures torque.

The sensor 500 may be provided with two sensors 500A and 500B. Based on the center C of the stator, the two sensors 500A and 500B may be arranged facing each other.

The first collector body 310 and the second collector body 320 are disposed facing the sensors 500A and 500B, respectively.

28 is a view showing a circuit board.

Referring to FIG. 28, two sensors 500A and 500B may be disposed on a circuit board. The two sensors 500A and 500B are arranged in a form erected upward from the circuit board 600.

Fig. 29 is a sectional view showing the connector housing and the pin of the housing.

Referring to FIG. 29, the housing 700 includes a connector housing 760 and pins 770. The pin 770 electrically connects the circuit board 600 and an external cable. One side of the pin 770 is connected to the circuit board 600 disposed under the housing 700. The other side of the pin 770 is exposed inside the connector housing 760. The inlet of the connector housing 760 may be perpendicular to the axial direction. The pin 770 may have a “b” shaped bent shape.

30 is a view showing the first member and the second member, and FIG. 31 is a view showing the first member and the second member installed in the stator holder.

30 and 31, the first member 800 is for preventing a sidewall of the hole 713 of the housing body 231 from being worn and an error in coaxial alignment of the sensing device. As we saw earlier. The first tooth 132 and the second tooth 142 are disposed to overlap in the radial direction. And. In the radial direction, a sensor 500 is disposed between the first tooth 132 and the second tooth 142. Therefore, when the flow occurs in the radial direction, while the distance between the first tooth 132 and the sensor 500 and the second tooth 142 changes, a fatal damage to the sensor device or performance problems may occur. have.

The first member 800 may be a ring-shaped member. A body 810 and a flange portion 820 may be included. The body 810 is a cylindrical member. The body 810 may be disposed along the inner wall of the hole 713 of the housing body 710. The body 810 is located between the outer circumferential surface of the stator holder 110 and the inner wall of the hole 713 of the body 810. The flange portion 820 is a shape extending radially from the bottom of the body 810. The flange portion 820 is disposed to be in contact with the lower surface of the housing body 710. In addition, the flange portion 820 may be disposed to cover a portion of the first cover 701. In addition, the first member 800 may be a metal material.

The lower surface of the flange portion 820 may contact the upper surface of the first member 800.

The first member 800 physically isolates the hole 713 and the stator holder 110 of the housing body 710 as the stator holder 110 rotates, so that the housing body as the stator holder 110 rotates The inner wall of the hole 713 of the 710 serves to prevent wear. As a result, the first member 800 secures the coaxial rotation of the stator holder 110.

With respect to the axial direction, the housing 700 is caught by the main gear 121 of the stator body 120 and does not fall out to the upper side of the stator 200. C??, the housing 700 may be pulled out below the stator 200. The second member 900 serves to prevent the housing 900 from falling out under the stator 200. The second member 900 may be in the form of a c-ring. The second member 900 may be a metal material. The second member 900 may be an elastically deformable material.

The second member 900 is coupled to the groove 111 of the stator holder 110. The groove 111 is formed concave along the outer circumferential surface of the stator holder 110. The second member 900 is positioned below the lower surface of the housing body 710 in a state coupled to the stator holder 110. In addition, the second member 900 is disposed below the first member 800 to support the lower surface of the flange portion 820 of the first member 800.

32 is a view showing a first gear and a second gear meshing with the main gear.

Referring to FIGS. 2 and 32, as a sub gear engaged with the main gear 121, the first gear 1100 and the second gear 1200 are included. The main gear 121, the first gear 1100, the second gear 1200, and the third sensor 610 are for measuring the angle of the steering shaft.

The main gear 121, the first gear 1100, and the second gear 1200 rotate in engagement with each other. The main gear 121 is disposed on the outer peripheral surface of the stator body 120. The first gear 1100 and the second gear 1200 are rotatably disposed on the housing body 710. Each gear ratio of the main gear 121, the first gear 1100, and the second gear 1200 is predetermined. For example, when the total angle of the main gear 121 is, when the main gear 121 rotates 4.5, the first gear 1100 rotates 15.6, and the second gear 1200 rotates 14.625. Can be. Here, the total angle is an angle calculated by accumulating the rotation of the main gear 121 when all the gears return to the state immediately before the rotation.

A magnet may be disposed on the first gear 1100 and the second gear 1200. The magnet is arranged to face the third sensor 610. The third sensor 610 is mounted on the circuit board.

33 is a diagram showing the directionality of the external magnetic field with respect to the stator tooth, FIG. 34 is a diagram showing the avoidance state of the sensor with respect to the external magnetic field with z-axis directionality, and FIG. 35 is the external magnetic field with a y'-axis directionality It is a figure showing the avoidance state of the first and second stator teeth for.

Referring to FIG. 33, the external magnetic field greatly affects the sensing device in the z-axis direction, which is the axial direction, and the y'-axis direction, which is perpendicular to the z-axis direction. Here, the y'-axis direction means a direction toward the sensor 500 in a radial direction perpendicular to the axial direction.

Referring to FIG. 34, the sensor 500 of the sensing device according to the embodiment is disposed in an erected state in the z-axis direction. Therefore, the area of the sensor 500 as viewed from the z-axis is. It is very smaller than the area of the sensor 500 viewed in y'. Therefore, the sensing device according to the embodiment has an advantage that the influence of the external magnetic field on the sensor 500 is small based on the z-axis direction.

Referring to FIG. 35, when the state of the sensor 500 in a state erected in the z-axis direction, the outer circumferential magnetic field in the y'-axis direction may have a great influence on the sensor 500. However, since the outer circumferential magnetic field in the y'-axis direction is guided along the first stator tooth 130 and the second stator tooth 140, it flows without affecting the sensor 500. Therefore, the sensing device according to the embodiment has an advantage that the influence of the external magnetic field on the sensor 500 is small even when the y'axis is referenced.

36 is a graph comparing the comparative example and the example with respect to the angular change amount corresponding to the external magnetic field in the z-axis direction.

Referring to FIG. 36, in the case of the comparative example, the stator tooth is disposed up and down, and the sensor is a sensor having a structure in which the sensor is laid down, and as the external magnetic field in the z-axis direction increases, the amount of angular change increases linearly, resulting in an external magnetic field. Accordingly, it can be seen that the measurement angle changes significantly.

On the other hand, in the case of the embodiment, it can be seen that even when the external magnetic field in the z-axis direction increases, there is almost no angle change, and thus it is not affected by the external magnetic field.

37 is a graph comparing the comparative example and the example with respect to the amount of angular change corresponding to the external magnetic field in the y'-axis direction.

Referring to FIG. 37, in the case of the comparative example, as the sensing device having a structure in which the stator tooth is disposed up and down and the sensor is laid down, the angle change amount increases linearly as the external magnetic field in the y'-axis direction increases, and the external magnetic field It can be seen that the measurement angle is greatly changed according to.

On the other hand, in the case of the embodiment, it can be seen that even when the external magnetic field in the y'-axis direction increases, there is almost no angle change and is not affected by the external magnetic field.

100: stator
110: stator holder
120: stator body
130: first stator tooth
140: second stator tooth
200: rotor
210: rotor holder
220: rotor body
230: Magnet
300: collector

Claims (10)

A stator including a stator tooth; And
It includes a rotor that includes a magnet,
The stator tooth includes a first stator tooth and a second stator tooth disposed in the first stator tooth,
The first stator tooth includes a plurality of first teeth,
The second stator tooth includes a plurality of second teeth,
The first tooth overlaps in the radial direction from the center of the second tooth and the stator,
A sensor disposed between the first body of the first stator tooth and the second body of the second stator tooth, and
A circuit board connected to the sensor,
At least one of the first body and the second body is a sensing device including a protrusion projecting toward the sensor. A stator including a stator tooth; And
It includes a rotor that includes a magnet,
The stator tooth includes a first stator tooth having a first radius and a second stator tooth having a second radius,
The first stator tooth includes a plurality of first teeth,
The second stator tooth includes a plurality of second teeth,
The first tooth overlaps in the radial direction from the center of the second tooth and the stator,
A sensor disposed between the first body of the first stator tooth and the second body of the second stator tooth, and
A circuit board connected to the sensor,
At least one of the first body and the second body is a sensing device including a protrusion projecting toward the sensor. Stator; And
And a rotor at least partially disposed in the stator,
The stator
Stator holder,
A stator body combined with the stator holder,
And a first stator tooth disposed in the stator body and a second stator tooth having a radius greater than the first stator tooth,
The first stator tooth includes a first body and a plurality of first teeth connected to and spaced from the first body,
The second stator tooth includes a second body and a plurality of second teeth connected to and spaced from the second body,
The plurality of first teeth and the plurality of second teeth overlap in the radial direction,
A sensor disposed between the first body and the second body, and
A circuit board connected to the sensor,
At least one of the first body and the second body is a sensing device including a protrusion projecting toward the sensor. The method according to any one of claims 1 to 3,
It includes an annular first projection disposed on the first body and a second projection of the 횐 shape disposed on the second body,
The inner diameter of the first protrusion is smaller than the inner diameter of the first body,
A sensing device having an outer diameter of the second protrusion larger than an outer diameter of the second body. According to claim 4,
A sensing device having the same thickness as the first body and the same thickness as the first protrusion, and the same thickness as the second body. The method according to any one of claims 1 to 3,
A sensing device in which a collector is disposed between the sensor and the first body, and between the sensor and the second body. The method of claim 6,
The collector comprises a collector body facing the sensor, a first extension portion extending from one side of the collector body, and a second extension portion extending from the other side of the collector body. The method of claim 7,
The collector body includes a first collector body and a second collector body,
The first extension part and the second extension part are sensing devices connecting the first collector body and the second collector body, respectively. The method of claim 6,
The protruding portion is a sensing device disposed on any one of the first body and the second body. The method according to any one of claims 1 to 3,
In the axial direction, the length of the protrusion is at least greater than the length of the sensor.

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