KR20170077516A - Rotor assembly and motor including the same - Google Patents

Abstract

An embodiment includes a rotor portion; And a first cover including a first fixing plate covering one side of the rotor portion and a plurality of first wings protruded from the first fixing plate, wherein the first imaginary circle connecting the outer ends of the first wing portions, A rotor assembly smaller than the outer diameter of the first fixing plate and a motor including the rotor assembly are disclosed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a rotor assembly,

Embodiments relate to a rotor assembly and a motor including the rotor assembly.

Generally, a vehicle is equipped with a starter motor that drives the engine and an alternator that generates electricity using the rotational force of the engine.

The starter motor rotates the engine when battery power is supplied.

The alternator is rotated by the driving force of the engine to generate AC power. The developed electric power is charged into the battery using a rectifier or the like.

Both the starter motor and the alternator are structured with a stator and a rotor, and their structures are very similar. That is, depending on whether the power is applied or not, the generator may be operated or the motor may be operated.

Recently, research on a belt driven starter and generator (BSG) motor that can perform a role of a starter motor and an alternator in one structure is actively studied.

Since the motor generates heat in the process of rotating operation, it is important to rapidly discharge the heat generated to prevent the deterioration of the performance of the motor. Particularly, in the case of a structure in which the motor rotates at a high speed, such as a BSG motor that simultaneously performs a starter motor and an alternator function, it is more important.

In addition, the noise of the motor is also an important factor that determines the performance of the motor, and it is important to minimize the noise.

The embodiments provide a rotor assembly with excellent heat dissipation.

Further, there is provided a rotor assembly with improved noise.

A rotor assembly according to an embodiment of the present invention includes a rotor portion; And a first cover including a first fixing plate covering one side of the rotor portion and a plurality of first wings protruded from the first fixing plate, wherein the first imaginary circle connecting the outer ends of the first wing portions, Is smaller than the outer diameter of the first fixing plate.

Wherein the ratio of the radius of the first fixing plate to the first distance is 1: 0.1 to 1: 0.5, and the first distance is the shortest distance from the second imaginary circle connecting the inner end of the first wing portion to the outer diameter of the first fixing plate It can be distance.

Wherein the ratio of the first distance to the second distance is 1: 0.13 to 1: 0.20, the first distance is the shortest distance from the second virtual circle connecting the inner ends of the first wings to the outer diameter of the first fixing plate, The second distance may be the shortest distance from the first virtual circle to the outer diameter of the first fixing plate.

The first cover may include a through hole formed in the first fixing plate.

The rotor portion may include a plurality of slits formed in the longitudinal direction, and the first cover may include a support portion inserted into the plurality of slits and fixed to the rotor portion.

Wherein the rotor portion includes a central portion, a plurality of connecting portions radially formed at the central portion, and a plurality of protruding portions circumferentially projecting from both ends of the connecting portion; And a first coil wound on the connection portion.

A rotating shaft passing through a center portion of the rotor core; And a terminal supported by the rotating shaft and applying power to the first coil.

According to an embodiment of the present invention, there is provided a motor including: a housing having a plurality of through holes on an outer circumferential surface thereof; A stator part supported by the housing; And a rotor assembly rotatably disposed relative to the stator portion, wherein the rotor assembly includes a rotor portion; And a first cover including a first fixing plate covering one side of the rotor portion and a plurality of first wings protruded from the first fixing plate, wherein the first imaginary circle connecting the outer ends of the first wing portions, Is smaller than the outer diameter of the first fixing plate.

The housing includes: a first housing disposed on one side of the stator; And a second housing disposed on the other side of the stator unit.

A portion of the rotor assembly may be exposed between the first and second housings.

The housing may include a plurality of heat emitting portions formed along the outer circumferential surface.

Wherein the ratio of the radius of the first fixing plate to the first distance is 1: 0.1 to 1: 0.5, and the first distance is the shortest distance from the second imaginary circle connecting the inner end of the first wing portion to the outer diameter of the first fixing plate It can be distance.

Wherein the ratio of the first distance to the second distance is 1: 0.13 to 1: 0.20, the first distance is the shortest distance from the second imaginary circle connecting the inner end of the first wing portion to the outer diameter of the first fixing plate, The second distance may be the shortest distance from the first virtual circle to the outer diameter of the first fixing plate.

According to the embodiment, the heat dissipation of the rotor is excellent.

Further, the length of the rotating shaft can be shortened, and the motor can be downsized.

Also, the noise is reduced even at high speed rotation.

The various and advantageous advantages and effects of the present invention are not limited to the above description, and can be more easily understood in the course of describing a specific embodiment of the present invention.

1 is a perspective view of a motor according to an embodiment of the present invention,
Fig. 2 is a sectional view in the AA direction in Fig. 1,
3 is an enlarged view of a portion B in Fig. 2,
4 is a perspective view of a rotor assembly according to an embodiment of the present invention,
FIG. 5 is a conceptual view for explaining a blade portion of a rotor assembly according to an embodiment of the present invention,
6 is a graph of a noise curve according to the length of a wing portion,
FIG. 7 is a graph showing noise levels of a conventional motor and a motor according to an embodiment of the present invention,
FIG. 8 is a view showing a motor with the first cover removed in FIG. 1,
9 is a perspective view of the rotor assembly according to an embodiment of the present invention,
10 is an exploded perspective view of a rotor assembly according to an embodiment of the present invention,
Fig. 11 is a cross-sectional view in the BB direction of Fig.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail.

It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

In the present invention, the terms "comprising" or "having ", and the like, specify that the presence of a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

It is to be understood that the drawings are to be construed as illustrative and not restrictive.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant description thereof will be omitted.

FIG. 1 is a perspective view of a motor according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line A-A of FIG. 1, and FIG. 3 is an enlarged view of a portion B of FIG.

1 and 2, a motor according to the present invention includes a housing 100 having a plurality of through holes 111 and 121 formed on an outer circumferential surface thereof, a stator 300 supported by the housing 100, And a rotor assembly (200) disposed within the portion (300).

When the motor operates as an alternator, the pulley 600 is rotated by driving the engine to rotate the rotor assembly 200 to generate alternating current. The generated alternating current can be converted into direct current and supplied to an external component (such as a battery). In contrast, when the motor operates as a starter, the pulley 600 rotates while the rotor assembly 200 is rotated by an external current, so that external components (such as an engine) can be driven.

The housing 100 includes a first housing 110 disposed on one side of the stator unit 300 and a second housing 120 disposed on the other side of the stator unit 300. The first housing 110 and the second housing 120 include a plurality of through holes 111 and 121 formed along the circumferential direction. The through holes 111 and 121 can serve as a heat radiating portion for radiating heat generated inside the motor to the outside.

Protrusions (not shown) may be formed on the inner circumferential surfaces of the first housing 110 and the second housing 120 to engage with the outer surfaces of the stator 300, respectively.

The stator unit 300 includes a stator core 310 and a second coil 320 wound around the stator core 310. A portion 310a of the stator core 310 may be exposed between the first housing 110 and the second housing 120. [ Therefore, the heat generated in the stator unit 300 can be easily discharged to the outside. However, the present invention is not limited thereto, and the stator unit 300 may be disposed inside the housing 200.

The rotor assembly 200 includes a rotor portion 210, a first cover 220 covering the rotor portion 210, and a second cover 230. The rotor unit 210 rotates inside the stator unit 300 and includes a rotor core 211 and a first coil 212. The configuration of the rotor unit 210 is not limited to this, and a magnet may be attached to the inner or outer circumferential surface of the rotor core 211.

The first cover 220 and the second cover 230 are coupled to the rotor unit 210 and rotate integrally. The first cover 220 and the second cover 230 may be formed in the same shape and disposed on one side and the other side of the rotor unit 210, respectively.

The first cover 220 and the second cover 230 include projecting wings 225 and 235. The wing portions 225 and 235 serve as a cooling fan for generating a flow of gas when the rotor assembly 200 is rotated. The wing portions 225 and 235 may have a predetermined curvature so as to easily generate a flow of gas.

Referring to FIG. 3, when the rotor assembly 200 is rotated, a flow of gas is generated by the wing portion 225 inside the motor. The heat generated in the rotor 210 is rapidly discharged to the outside through the through hole 227 formed in the fixing plate of the first cover 220 and the through hole 111 formed in the first housing 110. Such a structure is advantageous for a motor in which a large amount of heat is generated by high-speed rotation.

Referring again to FIG. 2, the rotating shaft 400 rotates integrally with the rotor assembly 200. One end and the other end of the rotary shaft 400 are supported by the first bearing 510 and the second bearing 520. A belt pulley 600 that transmits power to the outside may be coupled to an end of the rotating shaft 400.

A terminal portion 410 for applying power to the first coil 212 wound on the rotor core 211 is disposed on the rotating shaft 400. The terminal portion 410 includes a first terminal 411 electrically connected to the first coil 212 and a second terminal 412 connected to the first terminal 411 and exposed to the outside.

4 is a perspective view of a rotor assembly in accordance with an embodiment of the present invention.

4, the first cover 220 includes a first fixing plate 221 that covers one side of the rotor 210, a first wing 225 that protrudes axially from the first fixing plate 221, And a first support portion 226 connected to the first fixing plate 221.

The first cover 220 can be manufactured by molding a resin. Accordingly, the first fixing plate 221, the first wing portion 225, and the first supporting portion 226 are integrally formed. This structure is advantageous in that mass production is easier, manufacturing cost is reduced, and design freedom is higher than the structure in which each component is assembled and assembled.

The first fixing plate 221 of the first cover 220 may include a ring shaped rim 222 and a center portion 223 depressed with respect to the rim 222.

The rim 222 may be formed in a ring shape and a plurality of through holes 227 and a first wing 225 may be disposed along the circumferential direction. The through hole 227 and the wing portion 225 may be regularly or irregularly arranged.

The central portion 223 may be recessed relative to the rim 222 as the portion through which the rotating shaft 400 is inserted. A through hole 227 may also be formed in the center portion 223 as necessary. The center portion 223 of the first fixing plate 221 is lowered, so that the height of the belt pulley (600 in FIG. 2) is also lowered, and the motor can be downsized.

FIG. 5 is a conceptual view for explaining a blade portion of a rotor assembly according to an embodiment of the present invention, FIG. 6 is a graph of a noise curve according to length of a blade portion, FIG. And FIG. 8 is a view showing a motor from which the first cover of FIG. 1 is removed.

5, the first imaginary circle C1 connecting the outer end 225b of the first wing 225 may be smaller than the outer diameter C3 of the first fixing plate 221. In this case, The radius R2 of the first imaginary circle C1 is smaller than the radius R1 of the first fixing plate. A predetermined gap R6 may be formed between the outer end 225b of the first wing 225 and the outer diameter C3 of the first fixing plate 221. [ The center C of the first fixing plate 221 and the first imaginary circle C1 may be the same.

The ratio (R1: R4) of the radius R1 of the first fixing plate 221 to the first distance R4 may be 1: 0.1 to 1: 0.5. If this condition is satisfied, noise and / or turbulence of the motor can be improved. The ratio of the radius R1 of the first fixing plate 221 to the first distance R4 may be 1: 0.3 to 1: 0.4. The first distance R4 is defined as the shortest distance from the second imaginary circle C2 connected to the inner end 225a of the first wing 225 to the outer diameter C3 of the first fixing plate 221 can do.

The plurality of first wing portions 225 may have a straight line shape, but the present invention is not limited thereto and may have a curvature.

Referring to FIG. 6, it can be seen that the noise can be kept below 75 dB when the ratio of the first distance R4 to the second distance R6 (R4: R6) satisfies 1: 0.13 to 1: 0.20 . If the ratio of the first distance R4 to the second distance R6 is maintained at 1: 0.15 to 1: 0.18, the noise can be minimized. Here, the second distance R6 can be defined as the shortest distance from the first virtual circle C1 to the outer diameter C3 of the first fixing plate 221. Therefore, it can be seen that noise and turbulence can be effectively improved when the ratio of R1 to R4, and the ratio of R4 and R6 satisfy the above-described conditions.

Referring to FIG. 7, in the conventional structure in which the first fixing plate has an outer diameter equal to the first distance (the end of the wing extends to the outer diameter of the fixing plate), the noise is 85.8 dB, Is improved to 83.1 db.

8, a space R6 is formed between the outer diameter C3 of the first fixing plate 221 and the first wing 225, thereby improving the turbulence and securing an additional space in which the coil can be seated . Cost can be reduced by the reduced wing area.

FIG. 9 is a perspective view of a rotor assembly according to an embodiment of the present invention, FIG. 10 is an exploded perspective view of a rotor assembly according to an embodiment of the present invention, and FIG. 11 is a sectional view taken along a line B-B in FIG.

9, the second cover 230 includes a second fixing plate 231 covering the other side of the rotor 210, a second wing 235 protruded from the second fixing plate 231, And a second support portion 236 connected to the fixing plate 231.

The second fixing plate 231 includes a ring-shaped rim 232 and a central portion 233 depressed with respect to the rim 232.

The second cover 230 may have the same shape as the first cover 220 described above only in a position where the second cover 230 is coupled to the rotor portion 210. That is, the first cover 220 and the second cover 230 may be rotationally symmetrical with respect to a direction perpendicular to the axial direction (the longitudinal direction of the rotation axis). Since the first cover 220 and the second cover 230 can be made of the same metal mold, the manufacturing cost is reduced.

Referring to FIGS. 10 and 11, the first support portion 226 and the second support portion 236 are inserted into the slit S formed in the rotor core 211 in the longitudinal direction. That is, the first support portion 226 and the second support portion 236 are inserted into one slit S, respectively. Although the first coil 212 is shown as being wound around the rotor core 221 in this figure, the rotor core may have a cylindrical shape and may have a slit S formed on its outer circumferential surface.

The first support portion 226 and the second support portion 236 may be fixed to the slit S. [ The first cover 220 is fixed to the rotor portion 210 by the first support portion 226 and the second cover 230 is fixed to the rotor portion 210 by the second support portion 236. [ The heat generated in the first coil 212 during the rotation of the motor assembly can be quickly discharged through the through hole 227 of the first cover 220 and the through hole 237 of the second cover 230.

11, the rotor core 211 includes a central portion 211a, a plurality of connecting portions 211b radially formed at the central portion 211a, and a plurality of protruding portions 211c protruding in the circumferential direction from both ends of the connecting portion 211b. (Not shown).

The first coil 212 is wound around the connecting portion 211b and the insulating member 213 is disposed between the connecting portion 211b and the first coil 212. Here, the slit S can be defined as the distance between the protrusions 211c of the rotor core.

The first support portion 226 includes a coupling portion 226a that engages with the slit S and a tapered portion 226b that becomes narrower toward the center of the coupling portion 226a.

The tapered portion 226b supports and / or presses the first coil 212 wound on the rotor portion 210. [ Therefore, even when the motor rotates at a high speed, the first coil 212 is prevented from being disengaged by the tapered portion 226b, thereby improving the reliability of the motor. As described above, since the first support portion 226 and the second support portion 236 are made of a non-conductive material, a risk of short-circuiting can be prevented.

100: Housing
200 rotor assembly
210:
220: first cover
221: first fixing plate
230: second cover
225: wing portion
226: Support
230: second cover
300: stator section
400:

Claims (13)

A rotor portion; And
And a first cover including a first fixing plate covering one side of the rotor portion and a plurality of first wings protruding from the first fixing plate,
Wherein a first imaginary circle connecting an outer end of the first wing portion is smaller than an outer diameter of the first fixed plate.
The method according to claim 1,
The ratio of the radius of the first fixing plate to the first distance is 1: 0.1 to 1: 0.5,
Wherein the first distance is a shortest distance from a second imaginary circle connecting an inner end of the first wing portion to an outer diameter of the first fixed plate.
The method according to claim 1,
Wherein the ratio of the first distance to the second distance is 1: 0.13 to 1: 0.20,
The first distance is the shortest distance from the second imaginary circle connecting the inner end of the first wing portion to the outer diameter of the first fixing plate,
Wherein the second distance is the shortest distance from the first imaginary circle to the outer diameter of the first stationary plate.
The method according to claim 1,
And the first cover includes a through hole formed in the first fixing plate.
The method according to claim 1,
Wherein the rotor portion includes a plurality of slits formed in the longitudinal direction,
Wherein the first cover includes a support portion inserted into the plurality of slits and fixed to the rotor portion.
The method according to claim 1,
The rotor unit includes:
A rotor core including a central portion, a plurality of connecting portions radially formed at the central portion, and a plurality of protruding portions circumferentially projecting from both ends of the connecting portion; And
And a first coil wound on the connection portion.
The method according to claim 6,
A rotating shaft passing through a center portion of the rotor core; And
And a terminal supported on the rotating shaft and adapted to apply power to the first coil.
A housing having a plurality of through holes on an outer circumferential surface thereof;
A stator part supported by the housing; And
And a rotor assembly rotatably disposed with respect to the stator section,
The rotor assembly
A rotor portion; And
And a first cover including a first fixing plate covering one side of the rotor portion and a plurality of first wings protruding from the first fixing plate,
A rotor portion; And
And a first cover including a first fixing plate covering one side of the rotor portion and a plurality of first wings protruding from the first fixing plate,
Wherein the first imaginary circle connecting the outer end of the first wing portion is smaller than the outer diameter of the first fixing plate.
9. The method of claim 8,
The housing includes:
A first housing disposed on one side of the stator; And
And a second housing disposed on the other side of the stator section.
10. The method of claim 9,
Wherein a portion of the rotor assembly is exposed between the first housing and the second housing.
10. The method of claim 9,
Wherein the housing includes a plurality of heat emitting portions formed along an outer circumferential surface thereof.
10. The method of claim 9,
The ratio of the radius of the first fixing plate to the first distance is 1: 0.1 to 1: 0.5,
Wherein the first distance is a shortest distance from a second imaginary circle connecting an inner end of the first wing portion to an outer diameter of the first fixed plate.
10. The method of claim 9,
Wherein the ratio of the first distance to the second distance is 1: 0.13 to 1: 0.20,
The first distance is the shortest distance from the second imaginary circle connecting the inner end of the first wing portion to the outer diameter of the first fixing plate,
And the second distance is a shortest distance from the first virtual circle to the outer diameter of the first fixing plate.

Images