KR20190096090A - Motor - Google Patents

Abstract

The present invention provides a motor capable of easily arranging a shaft and a rotor. The motor comprises: a housing; a stator arranged in the housing; a rotor arranged in the stator; and a shaft coupled with the rotor. The rotor includes: a rotor core; a magnet including a plurality of unit magnets coupled to an outer circumferential surface of the rotor core; and a groove arranged in a boundary between an inner circumferential surface and an upper surface of the rotor core. The shaft includes: a first body; a plurality of wings extending from an upper surface of the first body to the outside; and a protrusion extending downwards from a lower surface of the first body. When the protrusion is arranged in the groove, a side surface edge of the wing is arranged at the center of a width of the unit magnet.

Description

Motor

Embodiments relate to a motor.

As a driving source of a vehicle braking device, a motor is used. The motor includes a rotor and a stator. The rotor engages with the shaft. When the rotor rotates, the shaft rotates in conjunction. The shaft is connected to the vehicle's braking system to provide the power necessary for braking.

The rotor may be hollow. The shaft may also be hollow. And the shaft can be fitted to the inner peripheral surface of the rotor. After assembling the shaft and the rotor, there is a problem that slip occurs in the rotational direction between the shaft and the rotor.

And the shaft may be arranged with a device for detecting the rotation of the rotor. Therefore, during the assembly of the shaft and the rotor, it is important that the rotor and the shaft are aligned in the rotational direction. However, in coupling the shaft to the rotor, it is very difficult to align the rotor and the shaft in the rotational direction.

Embodiments provide a motor that prevents slippage in the rotational direction between the shaft and the rotor and facilitates alignment of the shaft and the rotor in the rotational direction during assembly of the shaft and the rotor. For that purpose.

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

The present invention includes a housing, a stator disposed in the housing, a rotor disposed in the stator, and a shaft coupled to the rotor, wherein the rotor includes a rotor core and a plurality of unit magnets coupled to an outer circumferential surface of the rotor core. And a groove disposed at a boundary between the inner circumferential surface and the upper surface of the rotor core, wherein the shaft includes a first body, a plurality of wings extending outwardly from an upper surface of the first body, and the first 1 includes a projection extending downward from the lower surface of the body, if the projection is disposed in the groove, the side edge of the blade can provide a motor disposed in the center of the width of the unit magnet.

Preferably, the plurality of wings are disposed at regular intervals along the circumferential direction of the first body, the extension line extending along the side edge of the blade may pass through the center of the shaft.

Preferably, the plurality of vanes may be arranged rotationally symmetrical with respect to the center of the shaft.

Preferably, the first body includes a plurality of the protrusions, and the protrusions may be disposed to be rotationally symmetric with respect to the center of the first body.

Preferably, the rotor core includes a plurality of the grooves, and the grooves may be disposed to be rotationally symmetric with respect to the center of the rotor motor.

Preferably, the radius from the center of the shaft to the outer surface of the wing may be greater than the maximum radius of the magnet at the center of the rotor.

Preferably, the rotor further comprises a can disposed outside the magnet, the can includes a second body and an upper surface which is bent and extended from the upper surface of the second body, wherein the inner diameter of the upper surface is the shaft It may correspond to the outer diameter of the first body of.

Preferably, the rotor further comprises a can disposed outside of the magnet, the can includes a second body and an upper surface which is bent and extended from the upper surface of the second body, wherein the inner diameter of the upper surface is It may be at least greater than the distance from the center of the rotor core to the outer surface of the groove in the radial direction of the rotor core.

Preferably, the inner diameter of the first body may correspond to the inner diameter of the rotor core.

Preferably, in a radial direction of the shaft, the distance from the center of the first body to the inner circumferential surface of the protrusion may correspond to the inner diameter of the rotor core.

According to the embodiment, in the rotational direction, it provides an advantageous effect of preventing slip from occurring.

According to the embodiment, in the process of assembling the shaft and the rotor, in the rotational direction, it provides an advantageous effect that can easily align the shaft and the rotor.

1 illustrates a motor according to an embodiment;
2 is a perspective view of the shaft and the rotor shown in FIG.
3 is an exploded view of the shaft and the rotor shown in FIG.
4 is a plan view of the shaft,
5 is a bottom view of the shaft,
6 is a plan view of the shaft coupled to the rotor,
7 is a plan view of the rotor core and the magnet,
8 is a plan view of the rotor.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments in conjunction with the accompanying drawings. And the terms or words used in this specification and claims should not be construed as being limited to the ordinary or dictionary meanings, the inventors properly define the concept of terms in order to best explain their invention in the best way Based on the principle that it can be, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. In describing the present invention, detailed descriptions of related well-known technologies that may unnecessarily obscure the subject matter of the present invention will be omitted.

Terms including ordinal numbers, such as second and first, may be used to describe various components, but the components are not limited by the terms. 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 the first component, and similarly, the first component may also be referred to as the second component. The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

1 is a view showing a motor according to an embodiment.

Referring to FIG. 1, a motor according to an embodiment may include a shaft 100, a rotor 200, and a stator 300.

The shaft 100 may be coupled to the rotor 200. When electromagnetic interaction occurs in the rotor 200 and the stator 300 through a current supply, the rotor 200 rotates and the shaft 100 rotates in association with the rotor 200. The shaft 100 may be connected to the braking device of the vehicle to transmit power. The shaft 100 may be in the form of a tube with an empty inside.

The rotor 200 rotates through electrical interaction with the stator 300.

The rotor 200 may include a rotor core 210, a magnet 220, and a can 230. The rotor core 210 may have a hollow tube shape. The magnet 220 is attached to the outer circumferential surface of the rotor core 210. Can 230 surrounds magnet 220. The can 230 is a member for protecting the magnet 220.

The stator 300 is disposed outside the rotor 200. The coil may be wound around the stator 300. The coil causes electrical interaction with the magnet 220 of the rotor 200. The stator 300 may include a stator core including a plurality of teeth. The stator core may be provided with an annular yoke portion, and a tooth for winding a coil in the center direction from the yoke may be provided. Teeth may be provided at regular intervals along the outer circumferential surface of the yoke portion. On the other hand, the stator core may be formed by stacking a plurality of plates in the form of a thin steel sheet. In addition, the stator core may be formed by coupling or connecting a plurality of split cores.

2 is a perspective view illustrating the shaft and the rotor illustrated in FIG. 1, and FIG. 3 is an exploded view of the shaft and the rotor illustrated in FIG. 2.

2 and 3, the shaft 100 includes a first body 110, a wing 120, and a protrusion 130. The first body 110, the wing 120, and the protrusion 130 can be described separately according to their shape and functional characteristics, and are one means connected to each other vertically.

The first body 110 is a cylindrical member. The wing 120 extends horizontally in the radial direction from the top of the first body 110. The wing 120 is for detecting the position of the rotor 200. The plurality of wings 120 may be disposed at predetermined intervals along the circumference of the first body 110. The blade 120 is disposed above the magnet 220 of the rotor 200. A space is formed between the wing 120 and the wing 120.

The hall sensor of the external device may be disposed above the wing 120. The hall sensor is disposed facing the top of the magnet 220 of the rotor 200. When the rotor 200 rotates in the axial direction, when the wing 120 is positioned between the hall sensor and the magnet 220, the wing 120 intersects between the hall sensor and the magnet 220. In addition, when the rotor 200 rotates and the empty space between the magnet 220 and the magnet 220 is located between the hall sensor and the magnet 220, the hall sensor and the magnet 220 are opened. Accordingly, as the rotor 200 rotates, a sensing signal of the hall sensor is generated, and the external device can detect one rotation of the motor based on the generated sensing signal.

In the process of assembling the shaft 100 to the motor, it is important to assemble the shaft 100 to the rotor 200 in accordance with the origin in the rotation direction. The motor according to the embodiment prevents slip occurring between the shaft 100 and the rotor 200 through the protrusion 130 and at the same time assembling the shaft 100 to the motor, the rotor easily in the rotation direction. Attempt to align the 200 and the shaft 100.

The protrusion 130 protrudes downward from the lower end of the first body 110. The protrusion 130 is inserted into the groove 211 of the rotor core 210. The protrusion 130 is inserted into the groove 211 to restrain the shaft 100 and the rotor 200 in the rotational direction. The shaft 100 may include a plurality of protrusions 130.

The rotor core 210 includes a plurality of grooves 211. The groove 211 is disposed at the boundary between the upper surface and the inner circumferential surface of the rotor core 210. Therefore, the groove 211 is formed concave downward from the upper surface of the rotor core 210, and is formed concave outward from the inner surface of the rotor core 210.

4 is a plan view of the shaft, and FIG. 5 is a bottom view of the shaft.

Referring to FIG. 4, the outer surface of the wing 120 is curved. The outer surface of the wing 120 may be an arc surface having a radius. Then, the lateral edge of the blade 120, the virtual reference line extending from the side edge 121 of the blade 120 passes through the center C1 of the shaft 100, based on the radial direction of the shaft 100. 121 can be designed.

Referring to FIG. 5, the protrusion 130 protrudes downward from the lower end of the first body 110. The plurality of protrusions 130 may be disposed at regular intervals along the circumferential direction of the first body 110. The plurality of protrusions 130 are disposed to be rotationally symmetric with respect to the center C1 of the shaft 100.

FIG. 6 is a plan view of the shaft coupled to the rotor, FIG. 7 is a plan view of the rotor core and the magnet, and FIG. 8 is a plan view of the rotor.

6 to 7, the plurality of vanes 120 are disposed to be rotationally symmetric with respect to the center C1 of the shaft 100. In the magnet 220, a plurality of unit magnets 220a are disposed along the circumference of the rotor core 210. The plurality of grooves 211 are disposed to be rotationally symmetric with respect to the center C2 of the rotor core 210.

When the protrusion 130 is inserted into the groove 211, the side edge 121 of the wing 120 is located at the width center P of the unit magnet 220a. Therefore, when the shaft 100 is assembled to the rotor core 210, the blade 120 is disposed in the region as shown in S of FIG. In this case, the polarity of the unit magnet 220a may be an N pole. When the side edge 121 of the wing 120 is located at the center of the width of the unit magnet 220a, the shaft 100 and the rotor 200 are aligned with the rotation origin for detecting one rotation of the rotor 200.

In addition, when the protrusion 130 is inserted into the groove 211, the shaft 100 and the protrusion 130 are constrained to each other in the rotational direction. Therefore, slip of the shaft 100 and the rotor 200 can be prevented.

The radius from the center C1 of the shaft 100 to the outer surface of the blade 120 (R1 in FIG. 4) is the maximum radius from the center C2 of the rotor core 210 to the outer surface of the magnet 220 ( Must be at least greater than R3). This is to sufficiently cover the magnet 220 and the Hall sensor in the axial direction. In addition, the inner diameter R2 of the first body 110 of the shaft 100 may be the same as the inner diameter R5 of the rotor core 210. In addition, in the radial direction of the shaft 100, the distance from the center C1 of the shaft 100 to the inner circumferential surface of the protrusion 130 may correspond to the inner diameter R5 of the rotor core 210.

The can 230 includes a second body 232 and an upper surface 231. The second body 232 is a cylindrical member and surrounds the magnet 220. The upper surface 231 is bent horizontally toward the center of the can 230 at the upper end of the second body 232. The upper surface 231 is in contact with the upper surface 231 of the rotor core 210. The upper surface 231 forms a hole in the center. At this time, the inner diameter (R6 of FIG. 8) of the upper surface 231 is larger than the distance R4 from the center C2 of the rotor core 210 to the outer surface of the groove 211 in the radial direction of the rotor core 210. At least it must be large. This is to prevent the top surface 231 from covering the groove 211.

The above has been described in detail with reference to the accompanying drawings with respect to a motor according to an embodiment of the present invention.

The above description is merely illustrative of the technical idea of the present invention, and various modifications, changes, and substitutions may be made by those skilled in the art without departing from the essential characteristics of the present invention. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by the embodiments and the accompanying drawings. . The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

100: shaft
110 first body
120: wings
130: turning
200: rotor
210: rotor core
211: home
220: magnet
230: can
231: top
232: second body
300: stator

Claims (10)

housing;
A stator disposed within the housing;
A rotor disposed in the stator; And
A shaft that engages the rotor,
The rotor includes a magnet including a rotor core and a plurality of unit magnets coupled to an outer circumferential surface of the rotor core,
The rotor includes a groove concavely disposed at the boundary between the inner peripheral surface and the upper surface of the rotor core,
The shaft includes a first body, a plurality of wings extending outward from the upper surface of the first body and a protrusion extending downward from the lower surface of the first body,
The motor is disposed in the center of the width of the unit magnet that is located on the side of the wing when the projection is disposed in the groove. According to claim 1,
The plurality of vanes are arranged at regular intervals along the circumferential direction of the first body, the extension line extending along the side edge of the vane passes through the center of the shaft. The method of claim 2,
The plurality of vanes are disposed to be rotationally symmetrical with respect to the center of the shaft. The method of claim 2,
The first body includes a plurality of the protrusions,
The protrusion is disposed to be rotationally symmetrical with respect to the center of the first body. The method of claim 2,
The rotor core includes a plurality of the grooves,
The groove is a motor disposed to be rotationally symmetrical with respect to the center of the rotor motor. According to claim 1,
The radius from the center of the shaft to the outer surface of the wing is greater than the maximum radius of the magnet at the center of the rotor. According to claim 1,
The rotor further includes a can disposed outside of the magnet,
The can includes a second body and an upper surface that is bent and extends from an upper surface of the second body,
The inner diameter of the upper surface corresponds to the outer diameter of the first body of the shaft. According to claim 1,
The rotor further includes a can disposed outside of the magnet,
The can includes a second body and an upper surface that is bent and extends from an upper surface of the second body,
And the inner diameter of the upper surface is at least greater than the distance from the center of the rotor core to the outer surface of the groove in the radial direction of the rotor core. According to claim 1,
The inner diameter of the first body corresponds to the inner diameter of the rotor core. The method of claim 9,
A motor corresponding to a distance from the center of the first body to the inner peripheral surface of the protrusion and the inner diameter of the rotor core in the radial direction of the shaft.

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