KR20220073080A - Motor - Google Patents

Abstract

The present invention is a shaft; a rotor coupled to the shaft; a stator disposed to correspond to the rotor; a holder disposed on one side of the shaft; and a magnet disposed on the holder, wherein the magnet comprises a first surface disposed toward the shaft and a second surface opposite to the first surface, wherein the holder has at least an edge of the second surface Provides a motor that is in contact with a part.

Description

motor {MOTOR}

The present invention relates to a motor.

The motor includes a rotor and a stator. At this time, the rotor rotates by electrical interaction between the rotor and the stator. Then, the shaft coupled to the rotor rotates. A detection unit including a magnetic element is disposed inside the motor. The magnetic element detects the current position by detecting the magnetic force of the sensing magnet rotating together with the shaft.

The conventional motor fixes the sensing magnet to the shaft by bonding. However, in the fixing method by bonding, there is a risk that the sensing magnet is separated in the axial direction.

An object of the present invention is to provide a motor with improved axial fixing force of a sensing magnet.

Embodiments include a shaft; a rotor coupled to the shaft; a stator disposed to correspond to the rotor; a holder disposed on one side of the shaft; and a magnet disposed on the holder, wherein the magnet comprises a first surface disposed toward the shaft and a second surface opposite to the first surface, wherein the holder has at least an edge of the second surface It is possible to provide a motor that is in contact with a part.

Preferably, the magnet includes a third surface connecting the first surface and the second surface, and the holder includes a first part in contact with the first surface; a second part extending from the first part and surrounding at least a portion of the third surface; and a third part extending from the second part and contacting at least a portion of an edge of the second surface.

Preferably, the second surface includes a first area in contact with the holder and a second area excluding the first area, wherein the second area is disposed inside the first area in a radial direction. can

Preferably, the second part includes a first hole, an axial width of the first hole is greater than an axial width of the magnet, and a width in a direction perpendicular to the axial direction of the first hole is the width of the magnet. It may be larger than a width in a direction perpendicular to the axial direction.

Preferably, the third part may extend in a circumferential direction about an axis of the shaft, and the third part may include a second hole.

Preferably, the third part is spaced apart from the axis of the shaft by a first distance and a second distance in a direction perpendicular to the axial direction, and the first distance may be smaller than a radius of the magnet.

Embodiments include a shaft; a rotor coupled to the shaft; a stator disposed to correspond to the rotor; a holder disposed on one side of the shaft; and a magnet disposed on the holder, wherein the magnet includes a first surface disposed toward the shaft and a second surface opposite to the first surface, wherein the holder is in contact with a portion of the second surface motor can be provided.

Preferably, the magnet includes a third surface connecting the first surface and the second surface, and the holder includes a first part in contact with the first surface; a second part extending from the first part and enclosing a portion of the third surface; and a third part extending from the second part and contacting a portion of the second surface.

Preferably, the second surface may include a first area in contact with the holder and a second area excluding the first area, and the first area and the second area may be disposed in a direction perpendicular to the axial direction. have.

Preferably, the second part and the third part may be arranged to be eccentric with respect to an axial center.

Preferably, the first part may include a step in contact with the third surface.

Preferably, the holder includes at least one groove disposed on a surface in contact with the first surface, and an adhesive may be disposed in the groove.

Preferably, the holder includes a first inner surface and at least one second inner surface that are disposed toward the third surface, and an angle between the first inner surface and an arbitrary straight line extending in a radial direction from an axis of the shaft may be different from an angle formed between the second inner surface and an arbitrary straight line extending in a radial direction from the axis of the shaft.

Preferably, the second inner surface may be two, the two second inner surfaces may be radially spaced apart from each other, and the first inner surface may be disposed between the two spaced apart second inner surfaces.

Preferably, the ratio of the first area to the area of the second surface may be 0.01 to 0.5.

According to the embodiment, by physically fixing the magnet on the shaft, it is possible to prevent the axial departure of the magnet, thereby improving the detection performance of the magnetic element.

1 is a cross-sectional view showing a motor according to an embodiment of the present invention.
2 is a conceptual diagram illustrating a circuit board, a holder, and a magnet.
Fig. 3 is a perspective view showing a first example of the holder.
4 is a cross-sectional view taken along line AA of FIG. 3 .
5 is a plan view of the holder and the magnet shown in FIG. 3 .
6 is an exploded perspective view of the magnet and the holder shown in FIG. 3 .
7 is a cross-sectional view of the holder and the magnet shown in FIG. 3 .
Fig. 8 is a cross-sectional view showing a second example of the holder.
Fig. 9 is a perspective view showing a third example of the holder.
10 is a perspective view of the holder and the magnet shown in FIG.
11 is a plan view of the holder and the magnet shown in FIG. 9 .
12 is a cross-sectional view of the holder and the magnet shown in FIG.

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

The direction parallel to the longitudinal direction (up and down direction) of the shaft is called the axial direction, the direction perpendicular to the axial direction with respect to the shaft is called the radial direction, and the direction along a circle having a radial radius around the shaft is the circumference called direction.

1 is a cross-sectional view of a motor according to an embodiment of the present invention.

Referring to FIG. 1 , the motor includes a shaft 100 , a rotor 200 , a stator 300 , a housing 400 , a holder 500 , a magnet 600 , and a circuit board 700 .

Hereinafter, the term "inside" indicates a direction from the housing 400 toward the shaft 100 which is the center of the motor, and "outside" indicates a direction opposite to the inside, which is a direction from the shaft 100 toward the housing 400 .

The shaft 100 may be coupled to the rotor 200 . When electromagnetic interaction occurs between the rotor 200 and the stator 300 through the supply of current, the rotor 200 rotates and the shaft 100 rotates in conjunction therewith. The shaft 100 may be connected to a steering device of a vehicle to transmit power.

The rotor 200 rotates through electrical interaction with the stator 300 . The rotor 200 may be disposed inside the stator 300 . The rotor 200 may include a rotor core and a rotor magnet disposed on the rotor core.

The stator 300 is disposed outside the rotor 200 . The stator 300 may include a stator core, a coil, and an insulator mounted on the stator core 310 . The coil may be wound around the insulator 330 . An insulator is disposed between the coil and the stator core. The coil causes electrical interaction with the rotor magnet.

The housing 400 may be disposed outside the stator 300 . The housing 400 may be a cylindrical member with one side open. The housing 400 may be variously deformed in shape or material, but a metal material that can withstand high temperatures well may be selected.

The holder 500 is coupled to the shaft. The holder 500 rotates in conjunction with the rotor 200 and the shaft 100 . The holder 500 may be a non-magnetic material.

The magnet 600 is coupled to the shaft 100 to interlock with the rotor 200 . The magnet 600 is a device for detecting the position of the rotor 200 .

The circuit board 700 may be spaced apart from the shaft 100 . The circuit board 700 may be a printed circuit board (PCB). In addition, the circuit board 700 may have a sensor 710 mounted thereon. The sensor 710 may be disposed to face the magnet 600 . The sensor 710 may be spaced apart from the magnet 600 . The sensor 710 may be a Hall IC. The sensor 710 may generate a sensing signal by detecting a change in the N pole and the S pole of the magnet 600 .

2 is a conceptual diagram illustrating a circuit board, a holder, and a magnet.

Referring to FIG. 2 , the holder 500 may be press-fitted to the end of the shaft 100 . And, the magnet 600 is magnetized to the holder 500 . At this time, the magnet 600 may be fixed to the holder 500 and both sides arranged in the axial direction. The magnet 600 is fixed to move in the axial direction by the holder 500 .

The magnet 600 includes a first face 601 , a second face 602 , and a third face 603 . The first surface 601 and the second surface 602 are axially spaced apart from each other. The first surface 601 is disposed toward the shaft 100 . And, the second surface 602 is disposed toward the opposite side of the first surface (601). The second surface 602 may face the sensor 710 . The first surface 601 and the second surface 602 are connected by a third surface 603 . The third surface 603 may be at least one. The third surface 603 may be a curved surface, but is not limited thereto.

The holder 500 may wrap at least a portion of the third surface 603 . In addition, it may be in contact with a portion of the second surface 602 . At this time, the holder 500 may be in contact with the edge of the second surface 602, but is not limited thereto. The holder 500 may be implemented in various forms for fixing the axial movement of the magnet 600 by being in contact with the second surface 602 .

Figure 3 is a perspective view showing a first example of the holder, Figure 4 is a cross-sectional view taken along the AA of Figure 3, Figure 5 is a plan view of the holder and the magnet shown in Figure 3, Figure 6 is the magnet and the holder shown in Figure 3 is disassembled It is a perspective view, and FIG. 7 is a sectional view of the holder and the magnet shown in FIG.

Referring to FIG. 3 , the holder 500A may include a first part 510 , a second part 520 , and a third part 530 .

The first part 510 is coupled to the shaft 100 .

The first part 510 may include a first part 511 and a second part 512 . The first part 511 may be press-fitted into the shaft 100 . The first part 511 may have a smaller diameter than the second part 512 . In addition, the magnet 600 may be seated on one surface of the second part 512 . The second part 512 may be in contact with the first surface 501 . In this case, a groove 512G may be disposed in the second part 512 . The groove 512G may be at least one. In this case, the groove 512G may be disposed in the center of the second part 512 , but is not limited thereto. In addition, an adhesive may be disposed in the groove 512G. In this case, the magnet 600 may be fixed on the first part 510 while the first surface 501 is adhered by an adhesive disposed in the groove 512G.

The second part 520 extends from the first part 510 . The second part 520 may be disposed outside the magnet 600 . The second part 520 may radially overlap the magnet 600 . The second part 520 may cover a portion of the third surface 603 of the magnet 600 . The axial length of the second part 520 may be greater than the axial length of the magnet 600 . In addition, the second part 520 may include a first hole 520H. The magnet 600 may be inserted into the holder 500 through the first hole 520H.

A third part 530 extends from the second part 520 . The third part 530 may contact the edge of the second surface 602 . The third part 530 may include a second hole 530H. The second hole 530H may have a circular shape. The second surface 602 may be exposed toward the sensor 710 through the second hole 530H. In this case, the radial width of the second hole 530H may be smaller than the radial width of the second surface 602 of the magnet 600 . The third part 530 may prevent the magnet 600 from being separated in the axial direction.

Referring to FIG. 4 , the second part 520 includes an inner surface and an outer surface. The inner surface of the second part 520 is disposed toward the magnet 600 . In this case, the inner surface of the second part 520 may include a curved surface. The curvature of the curved surface of the second part 520 may vary according to a circumferential position thereof.

The second part 520 may include a first inner surface 520A and at least one second inner surface 520B.

The first inner surface 520A and the at least one second inner surface 520B may be disposed in a circumferential direction. There may be two second inner surfaces 520B. The two second inner surfaces 520B may be disposed to be spaced apart in the circumferential direction, and the first inner surface 520A may be disposed between the two second inner surfaces 520B spaced apart from each other. The second inner surface 520B may be disposed adjacent to the first hole 520H. At this time, the angle formed by the first inner surface 520A and the virtual line CL extending in the radial direction from the axis C of the shaft 100 is different from the angle formed by the second inner surface 520B and the virtual line CL. can do.

The first inner surface 520A may be in contact with the third surface 603 of the magnet 600 . In addition, the second inner surface 520B may be spaced apart from the third surface 603 . The second inner surface 520B may guide the magnet 600 so that the magnet 600 that is inserted into the holder 500A through the first hole 520H is disposed in the correct position.

)는 제2 내면(520B)의 반경방향 두께(

)보다 클 수 있다. 그리고, 제2 내면(520B)의 반경방향 두께(

)는 제2 홀(520H)과 가까워질수록 줄어들 수 있다. 그리고, 축(C)에서 제2 내면(520B)까지의 거리(

)는 축(C)에서 제1 내면(520A)까지의 거리(

)보다 클 수 있다. 축(C)에서 제1 내면(520A)까지의 거리(

)는 마그넷(600)의 반지름과 같을 수 있다. 그리고, 축(C)에서 제2 내면(520B)까지의 거리(

)는 마그넷(600)의 반지름보다 클 수 있다.The second part 520 may be arranged to be eccentric from the axis C. The radial thickness of the first inner surface 520A (

) is the radial thickness of the second inner surface 520B (

) can be greater than And, the radial thickness of the second inner surface (520B) (

) may decrease as it approaches the second hole 520H. And, the distance from the axis C to the second inner surface 520B (

) is the distance from the axis C to the first inner surface 520A (

) can be greater than The distance from the axis C to the first inner surface 520A (

) may be equal to the radius of the magnet 600 . And, the distance from the axis C to the second inner surface 520B (

) may be greater than the radius of the magnet 600 .

)와 최소 두께(

)를 가질 수도 있다. 그리고, 제3 파트(530)는 축(C)으로부터 편심되도록 배치될 수도 있다. 이때, 제2 홀(530H)은 타원형일 수 있다. 반면, 도면에서는 도시하지 않았지만, 제3 파트의 두께는 원주방향으로 일정할 수도 있다. 이때, 제3 파트는 축과 동심으로 배치되며, 제3 파트의 제2 홀은 원형일 수 있다. Referring to FIG. 5 , the third part 530 has a maximum thickness (

) and the minimum thickness (

) may have In addition, the third part 530 may be arranged to be eccentric from the axis (C). In this case, the second hole 530H may have an elliptical shape. On the other hand, although not shown in the drawings, the thickness of the third part may be constant in the circumferential direction. In this case, the third part may be disposed concentrically with the axis, and the second hole of the third part may be circular.

Referring to FIG. 6 , the magnet 600 may be inserted into the holder 500A through the first hole 520H. In this case, the width W1 of the first hole 520H in the axial direction may be greater than the width W3 of the magnet 600 in the axial direction. In addition, the width W2 in the direction perpendicular to the axial direction of the first hole 520H may be greater than the width W4 in the direction perpendicular to the axial direction of the magnet 600 . In this case, the magnet 600 inserted into the holder 500A may be disposed between the first part 510 and the third part 530 . Also, a portion of the third surface 603 may be exposed through the first hole 520H.

Referring to FIG. 7 , the second surface 602 of the magnet 600 may include a first area 602A and a second area 602B.

The first region 602A may be in contact with the third part 530 . In this case, the first region 602A may have an arc shape when viewed from the axial direction. The second region 602B may not come into contact with the third part 530 . In addition, the second region 602B may overlap the second hole 530H in the axial direction. Accordingly, the second region 602B may be exposed through the second hole 530H when viewed from the axial direction.

The first region 602A may be arranged to be eccentric from the axis C. The first region 602A and the second region 602B may be disposed in a direction perpendicular to the axial direction. The first area 602A may be disposed closer to the first hole 520H than the second area 602B. According to an embodiment, a ratio of the area of the first region 602A to the area of the second surface 602 may be 0.01 to 0.5.

)와 최소 거리(

)를 가질 수 있다. 이때, 최대 거리(

)는 마그넷(600)의 반지름(R)과 같거나, 마그넷(600)의 반지름(R)보다 클 수 있다. 그리고, 최소 거리(

)는 마그넷(600)의 반지름(R)보다 작을 수 있다.The axis C and the third part 530 have a maximum distance in the radial direction (

) and the minimum distance (

) can have In this case, the maximum distance (

) may be equal to the radius R of the magnet 600 or greater than the radius R of the magnet 600 . And, the minimum distance (

) may be smaller than the radius R of the magnet 600 .

Fig. 8 is a cross-sectional view showing a second example of the holder. The holder shown in FIG. 8 is substantially the same as the holder shown in FIG. 3 except for the shape of the third part. Accordingly, the same components as those of FIG. 3 are given the same reference numerals, and repeated descriptions will be omitted.

Referring to FIG. 8 , the holder 500B may be in contact with the edge of the second surface 602 of the magnet 600 . In addition, the third part 530 may extend in the circumferential direction with respect to the axis C. The first region 602A may have an annular shape when viewed in the axial direction. In addition, the second region 602B may be disposed inside the first region 602A in the radial direction. According to an embodiment, a ratio of the area of the first region 602A to the area of the second surface 602 may be 0.01 to 0.5.

The third part 530 may be spaced apart from each other by an axis C, a first distance D1, and a second distance D2 in a direction perpendicular to the axial direction. The first distance D1 and the second distance D2 may be smaller than the radius R of the magnet 600 . In this case, the first distance D1 and the second distance D2 may be the same. On the other hand, the third part 530 may be designed as a structure in which the first distance D1 and the second distance D2 are different.

9 is a perspective view showing a third example of the holder, FIG. 10 is a perspective view of the holder and the magnet shown in FIG. 9, FIG. 11 is a plan view of the holder and the magnet shown in FIG. 9, and FIG. 12 is the holder shown in FIG. and a cross-sectional view of the magnet.

9 and 10 , the holder 500C may include a first part 540 , a second part 550 , and a third part 560 .

The first part 540 is coupled to the shaft 100 . The first part 540 may include a first part 541 and a second part 542 . The first part 541 may be press-fitted into the shaft 100 . The first portion 541 may have a smaller diameter than the second portion 542 .

A magnet 600 may be seated on one surface of the second part 542 .

The second part 542 may include a concave surface 5421 , a protruding surface 5422 , and a step 5423 . The concave elevation 5421 may be seated with the magnet 600 . The concave elevation 5421 may be in contact with the first surface 601 of the magnet 600 . In this case, the concave elevation surface 5421 may have the same shape as the first surface 601 of the magnet 600 . In addition, the protruding surface 5422 may be disposed on the outside of the concave surface 5421 . The protrusion surface 5422 may have an edge connected to the second part 550 . In this case, the protruding surface 5422 may radially overlap the third surface 603 of the magnet 600 . In addition, a step 5423 may be formed between the protruding surface 5422 and the concave surface 5421 . The step 5423 may be in contact with the third surface 603 of the magnet 600 . At this time, the step 5423 may prevent the magnet 600 from being separated in the radial direction.

A second part 550 extends from the first part 540 . The second part 550 may be disposed outside the magnet 600 . The second part 550 may radially overlap the magnet 600 . An inner peripheral surface of the second part 550 may surround a portion of the third surface 603 of the magnet 600 . The axial length of the second part 550 may be greater than the axial length of the magnet 600 . Also, the second part 550 may extend only in a partial area of the first part 540 . The second part 550 may include an opening 551 through which the magnet 600 passes.

The second part 550 includes an inner surface and an outer surface. An inner surface of the second part 550 may be disposed toward the magnet 600 . The inner surface of the second part 550 may include a curved surface. The curved surface of the second part 550 may have a different curvature according to a circumferential position thereof.

The inner surface of the second part 550 may include a first inner surface 550A and at least one second inner surface 550B.

The first inner surface 550A and the at least one second inner surface 550B may be disposed in a circumferential direction. There may be two second inner surfaces 550B. The two second inner surfaces 550B may be disposed to be spaced apart in the circumferential direction, and the first inner surface 550A may be disposed between the two second inner surfaces 550B spaced apart from each other. The second inner surface 550B may be disposed adjacent to the opening 551 . The first inner surface 550A may be in contact with the third surface 603 of the magnet 600 . The second inner surface 550B may be spaced apart from the third surface 603 . The second inner surface 550B may guide the magnet 600 so that the magnet 600 inserted into the holder 500C through the opening 551 is placed in the correct position.

An angle between the first inner surface 500A and an imaginary line extending in a radial direction from the axis C may be different from an angle between the second inner surface 550B and an imaginary line extending in a radial direction from the axis C. .

Referring to FIG. 12 , the second surface 602 of the magnet 600 may include a first area 602A and a second area 602B.

The first region 602A may be in contact with the third part 560 . The first region 602A may have an arc shape when viewed in the axial direction. The second region 602B may not come into contact with the third part 560 .

The first region 602A may be arranged to be eccentric from the axis C. The first region 602A and the second region 602B may be disposed in a direction perpendicular to the axial direction. The first region 602A may be disposed closer to the opening 551 than the second region 602B. According to an embodiment, a ratio of the area of the first region 602A to the area of the second surface 602 may be 0.01 to 0.5. As such, the magnet 600 may be physically fixed on the shaft by being in contact with the third part 560 in a partial region, and may prevent a phenomenon from being separated in the axial direction when the shaft is rotated.

The above-described embodiment can be used in various devices such as vehicles or home appliances.

100: shaft
200: rotor
300: stator
400: housing
500 (500A, 500B, 500C): Holder
510, 540: first part
520, 550: second part
530, 560: third part
600: magnet
601: first side
602: second side
603: the third side
700: circuit board
710: magnetic element

Claims (15)

shaft;
a rotor coupled to the shaft;
a stator disposed to correspond to the rotor;
a holder disposed on one side of the shaft; and
It includes a magnet disposed on the holder,
The magnet includes a first surface disposed toward the shaft and a second surface opposite to the first surface,
The holder is in contact with at least a portion of an edge of the second surface. According to claim 1,
The magnet includes a third surface connecting the first surface and the second surface,
The holder may include a first part in contact with the first surface;
a second part extending from the first part and surrounding at least a portion of the third surface; and
and a third part extending from the second part and contacting at least a portion of an edge of the second surface. 3. The method of claim 2,
The second surface includes a first area in contact with the holder and a second area excluding the first area,
The second region is disposed inside the first region in a radial direction. 4. The method of claim 3,
The second part includes a first hole,
The axial width of the first hole is greater than the axial width of the magnet,
A width in a direction perpendicular to the axial direction of the first hole is greater than a width in a direction perpendicular to the axial direction of the magnet. 4. The method of claim 3,
the third part extends in a circumferential direction about an axis of the shaft;
The third part of the motor includes a second hole. 6. The method of claim 5,
The third part is spaced apart from the axis of the shaft by a first distance and a second distance in a direction perpendicular to the axial direction,
The first distance is less than a radius of the magnet motor. shaft;
a rotor coupled to the shaft;
a stator disposed to correspond to the rotor;
a holder disposed on one side of the shaft; and
It includes a magnet disposed on the holder,
The magnet includes a first surface disposed toward the shaft and a second surface opposite to the first surface,
The holder is in contact with a portion of the second surface of the motor. 8. The method of claim 7,
The magnet includes a third surface connecting the first surface and the second surface,
The holder may include a first part in contact with the first surface;
a second part extending from the first part and enclosing a portion of the third surface; and
and a third part extending from the second part and contacting a portion of the second surface. 9. The method of claim 8,
The second surface includes a first area in contact with the holder and a second area excluding the first area,
The first region and the second region are disposed in a direction perpendicular to the axial direction. 10. The method of claim 9,
The second part and the third part are arranged to be eccentric with respect to an axis. 11. The method of claim 10,
The first part is a motor including a step in contact with the third surface. 8. The method of claim 1 or 7,
The holder includes at least one groove disposed on a surface in contact with the first surface,
A motor in which an adhesive is disposed in the groove. 9. The method of claim 2 or 8,
The holder includes a first inner surface and at least one second inner surface disposed toward the third surface,
An angle formed between the first inner surface and an arbitrary straight line extending in a radial direction from the axis of the shaft is different from an angle formed by the second inner surface and an arbitrary straight line extending in a radial direction from the axis of the shaft. 14. The method of claim 13,
The second inner surface is two,
The two second inner surfaces are radially spaced apart,
A motor in which the first inner surface is disposed between the two spaced apart second inner surfaces. 10. The method of claim 3 or 9,
The ratio of the area of the first area to the area of the second surface is 0.01 to 0.5.

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