KR102533810B1 - Motor - Google Patents

Abstract

The present invention is a housing; a stator disposed within the housing; a rotor disposed within the stator; And a shaft coupled to the rotor, wherein the rotor includes a rotor core; and a magnet including a plurality of unit magnets coupled to an outer circumferential surface of the rotor core, disposed at 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 outwardly from an upper surface of the first body, and a protrusion extending downward from a lower surface of the first body, and the protrusion is formed in the groove. When is arranged, the side edge of the wing may provide a motor disposed at the center of the width of the unit magnet.

Description

motor {Motor}

The embodiment relates to a motor.

As a driving source of a braking system of a vehicle, a motor is used. A motor includes a rotor and a stator. The rotor is coupled to the shaft. When the rotor rotates, the shaft rotates interlockingly. The shaft is connected to the brake system of the vehicle to provide power necessary for braking.

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

A device for sensing rotation of the rotor may be disposed on the shaft. Therefore, during the process of assembling the shaft and the rotor, it is important that the rotor and the shaft are aligned in the direction of rotation. However, in coupling the shaft to the rotor, it is very difficult to align the rotor and the shaft in the rotational direction.

An embodiment is to provide a motor capable of preventing slip from occurring between a shaft and a rotor in the rotational direction and easily aligning the shaft and the rotor in the rotational direction in the process of assembling the shaft and the rotor. for that purpose

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

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. The shaft includes a first body, a plurality of wings extending outward from the upper surface of the first body, and a groove disposed on a boundary between an inner circumferential surface and an upper surface of the rotor core. 1 includes a protrusion extending downward from the lower surface of the body, and when the protrusion is disposed in the groove, the side edge of the wing may provide a motor disposed at the center of the width of the unit magnet.

Preferably, the plurality of wings are arranged at regular intervals along the circumferential direction of the first body, and extension lines extending along side edges of the wings may pass through the center of the shaft.

Preferably, the plurality of wings may be arranged rotationally symmetrically with respect to the center of the shaft.

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

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

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

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

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

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

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

According to the embodiment, in the direction of rotation, an advantageous effect of preventing slip from occurring is provided.

According to the embodiment, in the process of assembling the shaft and the rotor, an advantageous effect of easily aligning the shaft and the rotor in the rotational direction is provided.

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

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

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

1 is a view showing a 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.

Shaft 100 may be coupled to 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 transmit power by being connected to a braking device of a vehicle. The shaft 100 may be in the form of a hollow tube.

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. A coil may be wound around the stator 300 . The coil causes an 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 provided with teeth on which a coil is wound in a central direction from the yoke. Teeth may be provided at regular intervals along the outer circumferential surface of the yoke portion. Meanwhile, the stator core may be formed by mutually stacking a plurality of plates in the form of thin steel plates. In addition, the stator core may be formed by coupling or connecting a plurality of split cores to each other.

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

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

The first body 110 is a cylindrical member. Wings 120 horizontally extend in the radial direction from the top of the first body (110). The wings 120 are for sensing the position of the rotor 200. The plurality of wings 120 may be arranged at regular intervals along the circumference of the first body 110 . The wing 120 is disposed above the magnet 220 of the rotor 200. A space is formed between the wings 120 and the wings 120 .

A Hall sensor of an external device may be disposed on the upper side of the wing 120 . The hall sensor is disposed facing the top of the magnet 220 of the rotor 200. When the rotor 200 rotates and the wing 120 is positioned between the hall sensor and the magnet 220 in the axial direction, the wing 120 blocks the space between the hall sensor and the magnet 220 . Also, when the rotor 200 rotates and an empty space between the magnets 220 is located between the hall sensor and the magnet 220, the space between the hall sensor and the magnet 220 is opened. Accordingly, as the rotor 200 rotates, a sensing signal of the Hall sensor is generated, and an external device can detect one revolution 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 alignment with the origin in the direction of rotation. 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, in the process of assembling the shaft 100 to the motor, the rotor is easily rotated in the direction of rotation. 200 and the shaft 100 are to be aligned.

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 mutually constrain 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 . Accordingly, the groove 211 is formed concave downward from the upper surface of the rotor core 210 and 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 Figure 4, the outer surface of the wing 120 is a curved surface. The outer surface of the wing 120 may be a circular arc surface having a radius. And, based on the radial direction of the shaft 100, the virtual reference line extending from the side edge 121 of the wing 120 passes through the center (C1) of the shaft 100, the side edge of the wing 120 (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 arranged at regular intervals along the circumferential direction of the first body 110 . The plurality of protrusions 130 are arranged rotationally symmetrically with respect to the center C1 of the shaft 100 .

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

Referring to FIGS. 6 and 7 , the plurality of wings 120 are arranged rotationally symmetrically about the center C1 of the shaft 100 . In addition, as for the magnets 220, a plurality of unit magnets 220a are disposed along the circumference of the rotor core 210. The plurality of grooves 211 are arranged rotationally symmetrically 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 center P of the width of the unit magnet 220a. Therefore, when the shaft 100 is assembled to the rotor core 210, the wing 120 is disposed in the same area as S in FIG. 7 . At this time, the polarity of the unit magnet 220a may be 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 sensing 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, slipping 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 wing 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 between the magnet 220 and the hall sensor in the axial direction. Also, 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 . Further, 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.

Meanwhile, 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 horizontally bent from the upper end of the second body 232 toward the center of the can 230 . 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 in FIG. 8) of the upper surface 231 is greater 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 should be big. This is to prevent the upper surface 231 from covering the groove 211 .

In the above, the motor according to one preferred embodiment of the present invention has been examined in detail with reference to the accompanying drawings.

The above description is merely an example of the technical idea of the present invention, and those skilled in the art can make various modifications, changes, and substitutions without departing from the essential characteristics of the present invention. will be. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings. . The protection scope of the present invention should be construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

100: shaft
110 first body
120: wing
130: projection
200: rotor
210: rotor core
211 Home
220: magnet
230: can
231: upper surface
232 second body
300: stator

Claims (10)

housing;
a stator disposed within the housing;
a rotor disposed within the stator; and
Including a shaft coupled to the rotor,
The rotor includes a rotor core and a magnet including a plurality of unit magnets coupled to an outer circumferential surface of the rotor core,
The rotor includes a groove concavely disposed at 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 outwardly from an upper surface of the first body, and a protrusion extending downward from a lower surface of the first body,
When the protrusion is disposed in the groove, the side edge of the wing is disposed at the center of the width of the unit magnet. According to claim 1,
The plurality of wings are disposed at regular intervals along the circumferential direction of the first body, and an extension line extending along a side edge of the wing passes through the center of the shaft. According to claim 2,
A motor in which the plurality of wings are disposed rotationally symmetrical with respect to the center of the shaft. According to claim 2,
The first body includes a plurality of the protrusions,
The protrusion is a motor disposed rotationally symmetrical with respect to the center of the first body. According to claim 2,
The rotor core includes a plurality of the grooves,
The groove is a motor disposed rotationally symmetrical with respect to the center of the rotor core. According to claim 1,
A motor in which a radius from the center of the shaft to the outer surface of the wing is greater than a maximum radius of the magnet from the center of the rotor core. According to claim 1,
The rotor further includes a can disposed outside the magnet,
The can includes a second body and an upper surface bent and extended from the 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 the magnet,
The can includes a second body and an upper surface bent and extended from the upper surface of the second body,
The inner diameter of the upper surface is at least larger than a 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,
An inner diameter of the first body corresponds to an inner diameter of the rotor core. According to claim 9,
In the radial direction of the shaft, a distance from the center of the first body to the inner circumferential surface of the protrusion corresponds to the inner diameter of the rotor core.

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