KR20180051150A - Assembly for sensing and apparatus for steering - Google Patents

Abstract

The present invention provides a sensor assembly, comprising: a rotor arranged with a first magnet on the outer circumferential surface thereof; a stator arranged at the outer side of the rotor; a circuit substrate; a first cover accommodating the circuit substrate; a first hole sensor and a second hole sensor arranged in the circuit substrate; a magnet securing member coupled to the stator; a second magnet coupled to the magnet securing member; and a metal based second cover coupled to the first cover, wherein the first magnet securing member and the second magnet are arranged between the first cover and the second cover, and the second cover includes an upper plate formed with a penetration hole and a side plate extended in a rotary shaft direction from the upper plate, wherein the side plate includes a groove formed in a location corresponding to the hole sensor.

Description

Technical Field [0001] The present invention relates to a sensor assembly and a steering apparatus including the same,

Embodiments relate to a sensor assembly and a steering apparatus including the sensor assembly.

A power steering system (hereinafter referred to as EPS) drives a motor in an electronic control unit according to operating conditions to ensure swivel stability and provide quick resilience, thus allowing the driver to drive safely .

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

The torque sensor measures the degree of torsion of the torsion bar and measures the torque applied to the steering shaft. The index sensor senses the rotation of the output shaft and measures the angular acceleration of the steering shaft. In a sensor assembly, such a torque sensor and an index sensor may be arranged together to be integrated.

However, such a sensor assembly causes magnetic field interference between the torque sensor and the index sensor. Therefore, in order to prevent magnetic field interference, a structure for shielding the magnetic field is separately provided between the torque sensor and the index sensor. Therefore, if the thickness of the entire sensor assembly is to be reduced, there is a problem that magnetic leakage occurs due to the magnetic field shield plate and the magnet being fitted. Also, there is a limit in reducing the overall thickness of the sensor assembly due to the mounting space of the magnetic shielding configuration. As a result, such a magnetic shielding configuration is 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 and a steering apparatus including the sensor assembly, which can reduce the thickness of the sensor assembly while avoiding magnetic field interference.

The problems to be solved by the embodiments are not limited to the above-mentioned problems, and other problems not mentioned here can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided an electric motor comprising a rotor having a first magnet disposed on an outer circumferential surface thereof, a stator disposed outside the rotor, a circuit board, a first cover for accommodating the circuit board, A second magnet coupled to the magnet seating member, and a second cover made of a metal and engaging with the first cover, wherein the first and second Hall sensors include a first hall sensor and a second hall sensor, Wherein the magnet mounting member and the second magnet are disposed between the first cover and the second cover, and the second cover includes an upper plate on which the through holes are formed and a side plate extending in the rotational axis direction from the upper plate, The sensing assembly may include a groove formed at a position corresponding to the hole 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 And a second hole through which the stator penetrates, and the circuit board may be disposed between the first 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 being disposed on the first surface, And 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, with reference to a direction perpendicular to the axial direction of the rotating shaft.

Preferably, the first cover may include a Hall sensor housing protruding from the outer surface and having the second hall sensor positioned therein.

Preferably, the Hall sensor housing is provided with a slot for accommodating the second hall sensor, and the slot may have an opening.

Preferably, the slot may include a stopper protruding from the opening in the opening.

Preferably, the first cover may be disposed on the outer side surface, and may include a receiving portion on which the magnet seating member is placed, the recess being disposed along the periphery of the first hole through which the stator penetrates.

Preferably, the magnet seating member includes 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 engaging portion that engages with the stator in a direction perpendicular to the axial direction of the rotating shaft.

Preferably, the stator includes a mold member for fixing two statorings and two statorings, and the mold member may include a second engaging second engaging portion engaging with the first engaging portion have.

Preferably, the first engaging portion is at least one protrusion protruding from the inner circumferential surface of the magnet seating member, and the second engaging portion is a groove that is disposed on the outer circumferential surface of the stator holder and into which the first engaging portion is inserted.

Preferably, the first cover includes a hole sensor housing protruding from an outer surface and having the second hall sensor positioned therein, and the groove of the side plate of the second cover and the hole sensor housing are rotatable in a rotation direction As shown in FIG.

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

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

Preferably, the second cover includes a third engaging portion, and the first cover may include a fourth engaging portion engaging with the third engaging portion.

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

According to another aspect of the present invention, there is provided a steering assembly including 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; A magnetic bearing device comprising: a stator; a circuit board; a first cover for accommodating the circuit board; a first Hall sensor and a second Hall sensor disposed on the circuit board; a magnet seating member coupled to the stator; And a second cover made of a metal and engaging with the first cover, wherein the magnet seating member and the second magnet are disposed between the first cover and the second cover, and the second cover Includes an upper plate having a through hole and a side plate extending from the upper plate in a rotational axis direction, and the side plate may include a groove formed at a position corresponding to the hole sensor.

According to embodiments, magnetic interference can be avoided through the cover of the metal material to provide an advantageous effect of reducing the thickness of the entire sensor assembly.

According to the embodiment, the magnet seating member and the stator are coupled in the direction perpendicular to the axial direction of the rotary shaft, thereby providing a favorable effect of further reducing the thickness of the sensor assembly.

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

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The objectives, specific advantages, and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. The terms and words used in the present specification and claims should not be construed to be limited to ordinary or dictionary terms and the inventor should properly define the concept of the term in order to describe its own invention in the best way. The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

The terms including ordinal, such as second, first, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed 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 and 2, the sensor assembly 10 includes a rotor 100, a stator 200, a circuit board 300, a first cover 400, a first Hall sensor 500, A second magnet 800, and a second cover 900. The second magnet 900 may be a magnet or a magnet.

The rotor 100 is disposed inside the stator 200. The rotor 100 is connected to the input shaft of the steering shaft, wherein the input shaft can be a steering shaft connected to the steering wheel of the differential. 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 yoke 110. The first magnet 120 may be disposed outside the yoke 110. The first magnet 120 may be fixed to the outer circumferential surface of the yoke 110 by adhesive bonding or press fitting.

The stator 200 is disposed outside the rotor 100. The stator 200 may include a stator 210, a mold member 220, and a holder 230. The stator 210 may be disposed in pairs in a facing manner. The two statorings 210 may be fixed to the upper side and the lower side of the mold member 220, respectively. The holder 230 is coupled to the mold member 220. The holder 230 may be connected to the output shaft of the steering shaft. Here, the output shaft may be a steering shaft connected to the power transmission structure on the wheel side. Accordingly, the stator 200 is connected to the output shaft and rotates together with the output shaft.

The stator 200 may be provided adjacent to the stator 210 to collect a magnetization of the stator 200.

3 is a side view of the circuit board shown in Fig.

In the circuit board 300, as shown in FIGS. 2 and 3, the first hall sensor 500 and the second hall sensor 600 are disposed.

The first cover 400 may include a first 1-1 cover 410 and a 1-2 cover 420. The first 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. The circuit board 300 is disposed between the first 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. The second cover 420 may include a second hole 421 through which the stator 200 passes.

3, the circuit board 300 may include a first side 310 facing the first 1-1 cover 410 and a second side 320 facing the first 1-2 cover 420 have. 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 magnetization amount of the stator 200 generated by the 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 to detect the amount of magnetization magnetized by the interaction between the stator 210 and the first magnet 120.

The rotor 100, the stator 200, and the first Hall sensor 500 are configured to measure torque. When the twist occurs, the amount of rotation of the first magnet 120 of the rotor 100 and the amount of rotation of the stator 200 are different from each other when the twist occurs. Accordingly, the magnetization of the first magnet 120 and the stator 210 are different from each other. The first hall sensor 500 detects such a change in magnetization amount and can measure the torque applied to the steering shaft.

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

The magnet seating member 700 is ring-shaped and provided with a hole 710 through which the stator 200 passes.

4 is a side view of the magnet seating member shown in Fig.

4, the magnet seating member 700 has a first surface 710 facing the first cover 400 and a second surface 710 facing the second cover 900 with respect to the axial direction C of the rotating shaft, And may include a surface 720. The second magnet 800 may be disposed on the second surface 720 to face 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 seating member 700. The second magnet 800 may be insert molded or adhesively fixed to the magnet seating member 700. The second magnet 800 rotates together with the magnet seating member 700 when the output shaft rotates. Accordingly, the second magnet 800 repeats a state of approaching and moving away from the second hall sensor 600 periodically as the output shaft rotates.

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 by the second cover 900 is limited to flow to the first magnet 120, the sensor assembly according to the embodiment is provided with a separate shield plate .

Fig. 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.

5 and 6, the 1-2 cover 420 may include a Hall sensor housing 422 and a receiving portion 423.

The Hall sensor housing 422 protrudes from the outer surface of the 1-2 cover 420. The Hall sensor housing 422 is disposed adjacent to the receiving portion 423. The second Hall sensor 600 is positioned inside the Hall sensor housing 422. The Hall sensor housing 422 serves to fix the position of the second Hall sensor 600. [ The Hall sensor housing 422 is provided with a slot 422a for receiving the second hall sensor 600 therein and has an open face opened toward the receiving portion 423. [ A stopper 422b may be protruded from the opening of the opening of the hall sensor housing 422 to prevent the second hall sensor 600 from being removed through the opening. As shown in FIG. 7, the second hall sensor 600 may be disposed in the slot 422a through an inlet 422c disposed on the bottom surface of the cover 1-2.

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

Meanwhile, the first cover 420 may include a fourth engaging portion 424. The fourth engaging portion 424 engages with the second cover 900. A plurality of fourth engaging portions 424 may be disposed around the receiving portion 423. The fourth engaging portion 424 may be a fastening protrusion. In addition, a coupling part 425 for coupling with the 1-1 cover 410 may be provided around the 1-2 cover 420.

Fig. 8 is a view showing a magnet seating member, and Fig. 9 is a view showing a state of engagement between a mold member and a magnet seating member of the stator.

8 and 9, the magnet seating member 700 may include a first engaging portion 720 protruding from the inner circumferential surface. When the magnet seating member 700 is coupled to the mold member 220 of the stator 200, the first engaging portion 720 can be coupled to the mold member 220 in a direction perpendicular to the axial direction of the rotating shaft. At this time, a second engaging portion 221 to be engaged with the first engaging portion 720 may be disposed on the outer circumferential surface of the mold member 220. The first engaging portion 720 may be a plurality of projections and the second engaging portion 221 may be a plurality of grooves into which the first engaging portion 720 is inserted.

Since the first engaging portion 720 and the second engaging portion 221 are engaged in a direction perpendicular to the axial direction of the rotary shaft when the magnet seating member 700 is engaged with the mold member 220 of the stator 200 , The thickness of the entire sensor assembly can be reduced. In other words, when the first engaging portion 720 and the second engaging portion 221 are coupled in the axial direction of the rotating shaft, a coupling space is required in the direction of the rotating shaft. This coupling space is a factor that increases the thickness of the entire sensor assembly. On the other hand, since the magnet seating member 700 of the sensor assembly according to the embodiment and the mold member 220 of the stator 200 are configured to be coupled in a direction perpendicular to the axial direction of the rotating shaft, Can be excluded.

Fig. 10 is a view showing a second cover, and Fig. 11 is a view showing a magnet seating 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 upper plate 910 is in the form of a disk and a through hole 911 through which the holder 230 of the stator 200 penetrates is disposed at the center. The side plate 920 is disposed along the periphery of the upper plate 910 and is bent downward on the upper plate 910. When the second cover 900 is engaged with the first cover 400, the side plate 920 is bent in a direction of the rotation axis of the upper plate 910. The inner diameter R1 of the side plate 920 is designed to be at least larger than the outer diameter R2 of the magnet seating member 700 as shown in Fig. The side plate 920 is disposed between the magnet seating member 700 and the Hall sensor housing 422 with reference to a direction perpendicular to the rotational axis direction.

On the other hand, the third engaging portion 922 may be disposed around the side plate 920. The third engaging portion 922 engages with the fourth engaging portion 424 of the first cover 420 to engage the second cover 900 with the second cover 400. The third engagement portion 922 may be a fastening flange projecting from the side plate 920 and including a fastening hole. A plurality of third coupling portions 922 may be disposed. In addition, a part of the plurality of third engaging portions 922 may be disposed adjacent to the groove 921.

12 is a view showing a side plate disposed between the second magnet and the second Hall sensor.

Referring to FIGS. 2 and 12, the side plate 920 is disposed between the magnet seating member 700 and the Hall sensor housing 422. Thus, the side plate 920 covers the side surface of the second magnet 800 disposed on the magnet seating member 700. And 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 for communicating the inside and the outside of the side plate 920 with each other. These grooves 921 are aligned with the second hall sensor 600. Specifically, when the second cover 900 is engaged with the first cover 400, the groove 921 is aligned with the hole sensor housing 112 in the rotational direction of the rotation shaft. This is because the side plate 920 covers the side surface of the second magnet 800 to cover the gap between the second magnet 800 and the second hall sensor 600. The second magnet 800 and the second magnet 800 So as to face the hall sensor 600.

With 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. The second hall sensor 600 can generate a detection signal at every 360 ° cycle.

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

12, when a flux generated by the rotation of the second magnet 800 is applied to the second cover 900 (see FIG. 12) without the shield structure between the first magnet 120 and the second magnet 800, ). ≪ / RTI >

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

Figs. 14 and 15A show sensor assemblies equipped with shielding plates, Figs. 14 and 15B show sensor assemblies without shielding plates, and Figs. 14 and 15C show a second cover 900 ).

As shown in Figs. 14 and 15, in the case of the sensor assembly B having no shielding plate, it can be seen that the torque output variation is greatly reduced in the range of angles of 40 ° to 160 °. This is because magnetic field interference occurs.

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

As described above, the sensor assembly according to one preferred embodiment of the present invention and the steering apparatus including the sensor assembly have been specifically described with reference to the accompanying drawings.

It is to be understood that one embodiment of the invention described above is to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description. It is intended that all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

0: Sensor assembly
100: Rotor
110: York
120: 1st magnet
200:
210: Statoring
220: mold member
221: second coupling portion
230: holder
300: circuit board
310: first side
320: second side
400: first cover
410: Cover 1-1
411: 1st hole
420: Cover 1-2
421: Second hole
422: Hall sensor housing
423:
424: fourth coupling portion
425:
500: first hall sensor
600: second hall sensor
700: Magnet seating member
710: hole
720:
800: Second magnet
900: second cover
910: Top plate
920: shroud
921: Home
922:

Claims (19)

A rotor having a first magnet disposed on an outer circumferential surface thereof;
A stator disposed outside the rotor;
A circuit board;
A first cover for receiving 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;
A second magnet coupled to the magnet seating member; And
And a second cover made of a metal to be engaged with the first cover,
The magnet seating member and the second magnet are disposed between the first cover and the second cover,
Wherein the second cover includes an upper plate on which a through hole is formed and a side plate extending in the rotational axis direction from the upper plate,
Wherein the side plate includes a groove formed at a position corresponding to the hole sensor. 3. The method of claim 2,
Wherein the first hall sensor senses the magnetic flux of the stator, and the second hall sensor senses the magnetic flux of the second magnet. The method according to claim 1,
Wherein the first cover includes a 1-1 cover and a 1-2 cover,
The first cover includes a first hole through which the rotor passes,
And the second cover includes a second hole through which the stator penetrates,
And the circuit board is disposed between the 1-1 cover and the 1-2 cover. The method of claim 3,
The substrate includes a first surface facing the 1-1 cover and a second surface facing the 1-2 cover,
Wherein the first hall sensor is disposed on the first surface and the second hall sensor is disposed on the second surface. The method according to claim 1,
The side plate being disposed between the second magnet and the second Hall sensor with reference to a direction perpendicular to the axial direction of the rotary shaft. The method of claim 1,
Wherein the first cover includes a hole sensor housing protruding from an outer surface and having the second hall sensor positioned therein. The method according to claim 6,
The Hall sensor housing includes:
A slot is provided to receive said second Hall sensor, said slot having an open side. 8. The method of claim 7,
Wherein the slot includes a stopper projecting from the opening in the opening. The method according to claim 1,
Wherein the first cover is disposed on an outer surface and includes a receiving portion on which the magnet seating member is placed, the recess being disposed along a periphery of a first hole through which the stator penetrates. The method according to claim 1,
Wherein the magnet seating member includes a first surface facing the second cover and a second surface facing the first cover,
Wherein the second magnet is disposed on the first surface. The method according to claim 1,
Wherein the magnet seating member includes a first engaging portion that engages the stator in a direction perpendicular to the axial direction of the rotating shaft. 12. The method of claim 11,
Wherein the stator includes a mold member for fixing two statorings and two statorings,
Wherein the mold member includes a second engaging second engaging portion that engages the first engaging portion. 13. The method of claim 12,
Wherein the first engaging portion is at least one protrusion protruding from an inner circumferential surface of the magnet seating member,
Wherein the second engaging portion is disposed on an outer circumferential surface of the stator holder and the first engaging portion is inserted. The method according to claim 1,
Wherein the first cover includes a hole sensor housing protruding from an outer surface and having the second hall sensor positioned therein,
Wherein the groove of the side plate of the second cover and the hole sensor housing are aligned with respect to a rotation direction of the rotation shaft. The method according to claim 1,
Wherein an inner diameter of the side plate of the second cover is larger than an outer diameter of the magnet seating member. The method according to claim 1,
And the second cover includes a hole through which the stator penetrates. The method according to claim 1,
The second cover includes a third engagement portion,
And the first cover includes a fourth engagement portion that engages the third engagement portion. 18. The method of claim 17,
Wherein the third engaging portion is a fastening flange protruding from the side plate and including a fastening hole,
And the fourth engaging portion is a fastening protrusion protruding from the first cover and inserted into the fastening hole. Steering shaft;
And a sensing assembly coupled to the steering shaft,
The sensing assembly includes:
A rotor having a first magnet disposed on an outer circumferential surface thereof;
A stator disposed outside the rotor;
A circuit board;
A first cover for receiving 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;
A second magnet coupled to the magnet seating member; And
And a second cover made of a metal to be engaged with the first cover,
The magnet seating member and the second magnet are disposed between the first cover and the second cover,
Wherein the second cover includes an upper plate on which a through hole is formed and a side plate extending in the rotational axis direction from the upper plate,
Wherein the side plate includes a groove formed at a position corresponding to the hole sensor.

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