KR20180034997A - Motor - Google Patents

Abstract

The present invention provides a motor which includes: a rotary shaft; a rotor including a hole in which the rotary shaft is arranged; a stator arranged on the outside of the rotor; and a housing receiving the rotor and the stator. The housing includes a first body, a second body arranged on the first body, and a plurality of first ribs connecting the first and second bodies. A plurality of second ribs are arranged between the adjacent first ribs. An interval between the adjacent second ribs is gradually increased toward a first point in the first rib based on a circumferential direction, based on the first point which is any one point located between the adjacent first ribs. Accordingly, noise and vibration generated in the housing can be reduced by securing the rigidity of the housing while sufficiently securing an intake port or an exhaust port for heat dissipation.

Description

Motor {Motor}

An embodiment relates to a motor.

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. Particularly, the housing of such a motor is provided with an intake port and an exhaust port for heat dissipation, and vibration and noise are increased due to a decrease in rigidity around the intake port and the exhaust port.

To solve the above-described problems, an embodiment of the present invention provides a motor that secures the rigidity of the housing and reduces the vibration and noise generated in the housing, while securing an intake port or an exhaust port for heat radiation in the housing of the motor. It is the task to be done.

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 a stator including a rotor including a rotating shaft, a hole in which the rotating shaft is disposed, a stator disposed outside the rotor, and a housing accommodating the rotor and the stator, The housing includes a first body, a second body disposed on the first body, and a plurality of first ribs connecting the first body and the second body, wherein a plurality of first ribs The second rib is disposed on the first rib and the second rib is disposed on the first rib in a circumferential direction with respect to a first point that is a point located between the neighboring first ribs, The spacing of the ribs can provide an increasing motor.

Preferably, the first point may be a midpoint of the neighboring first rib with respect to the circumferential direction.

Preferably, the distance from the first rib to the first point, with respect to the circumferential direction, of the second rib is larger than the distance between the second rib and the second rib adjacent to the first rib, May be increased in an equal ratio to the first spacing of the first rib.

Preferably, the thicknesses of the plurality of second ribs may be equal to each other.

Preferably, when the number of the second ribs disposed between neighboring first ribs is an even number, the first interval may be calculated by Equation (1).

&Quot; (1) "

Where a is the first spacing, S is the spacing of the adjacent first ribs relative to the circumferential direction, and r is a common ratio. and n is a value obtained by adding one to the number of the second ribs.

Preferably, when the number of the second ribs disposed between neighboring first ribs is an odd number, the first interval may be calculated by the following equation (2).

&Quot; (2) "

Where a is the first spacing, S is the spacing of the adjacent first ribs relative to the circumferential direction, r is a common ratio, and n is a value obtained by adding 0.5 to the half value of the number of the second ribs .

Preferably, the housing includes a first housing and a second housing, and the first housing and the second housing may each include an engaging portion that engages with each other.

Preferably, the first rib may be connected to the coupling portion.

Preferably, the plurality of first ribs may be spaced at equal intervals with respect to the circumferential direction.

Preferably, the engaging portion includes a fastening hole, and the first rib may be a pair of ribs connected to the engaging portion with the fastening hole interposed therebetween.

Preferably, the bearing further includes a bearing for supporting the rotation shaft. The housing may include a pocket portion for receiving the bay ring.

In order to solve the above problems, another embodiment of the present invention includes a rotor including a rotating shaft, a hole in which the rotating shaft is disposed, a stator disposed outside the rotor, and a housing accommodating the rotor and the stator The housing includes a first body, a second body disposed on the first body, and a plurality of first ribs connecting the first body and the second body, wherein a plurality And the cross-sectional area of the first rib may be 2.6 to 3.6 times the cross-sectional area of the second rib.

Preferably, the housing includes a first housing and a second housing, and the first housing and the second housing may each include an engaging portion that engages with each other.

Preferably, the first rib may be connected to the coupling portion.

Preferably, the plurality of first ribs may be spaced at equal intervals with respect to the circumferential direction.

Preferably, the second rib may be disposed at an angle to a reference line extending in a radial direction with respect to a center of the housing.

Preferably, the engaging portion includes a fastening hole, and the first rib may be a pair of ribs connected to the engaging portion with the fastening hole interposed therebetween.

Preferably, the thicknesses of the plurality of second ribs may be equal to each other.

Preferably, the bearing further includes a bearing for supporting the rotation shaft. The housing may include a pocket portion for receiving the bay ring.

According to the embodiment, the arrangement interval of the second ribs for realizing the intake port or the exhaust port of the housing is set to be narrower as the first rib is closer to the first rib and to be wider as the second rib is farther from the first rib, While securing the rigidity of the housing and providing a favorable effect of reducing noise and vibration generated in the housing.

According to the embodiment, the spacing of the second ribs is increased in a geometric ratio as the distance from the first rib is increased, thereby providing an advantageous effect of reducing noise and vibration generated in the housing.

1 shows a motor assembly according to an embodiment,
Fig. 2 is a view showing the motor shown in Fig. 1,
3 shows the connection of a connector and a bus bar,
4 is a perspective view of an integral cable according to an embodiment of the present invention,
5 is an exploded perspective view of an integral cable according to an embodiment of the present invention,
6 is a view showing a ground terminal portion,
7 is a view showing a side surface of the ground terminal shown in Fig.
8 is a view showing another embodiment of the ground terminal portion,
9 is a view showing a connector,
10 is a view showing a second body and a power terminal of the connector shown in FIG. 9,
Fig. 11 is a conceptual view for explaining a state in which an electromagnetic path line is formed between an integral cable and a motor, with reference to AA in Fig. 4; Fig.
12 is a view showing the contact between the ground terminal portion and the electromagnetic wave shielding layer of the cable.

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.

FIG. 1 is a view showing a motor according to an embodiment of the present invention. FIG. 2 is a sectional view of a motor taken along the line A-A of FIG. 1, and FIG. 3 is a view showing a cover of a rotor and a rotor.

1 to 3, the motor according to the embodiment may include a rotating shaft 100, a rotor 200, a stator 300, and a housing 400.

When the motor operates as an alternator, the pulley 1 is rotated by driving the engine, and the rotor 200 is rotated to generate alternating current. The generated alternating current can be converted into direct current and supplied to an external component (such as a battery). On the other hand, when the motor operates as a starter, the pulley 1 rotates while the rotor 200 is rotated by an externally applied current, so that external components (such as an engine) can be driven.

The rotating shaft 100 is arranged to pass through the center of the rotor 200. A pulley 1 is coupled to an end of the rotary shaft 100. The rotary shaft (100) is rotatably supported by the bearing (2). The bearing 2 may be coupled to the housing.

The rotor 200 rotates inside the stator 300. The rotor 200 includes a rotor core 210, a first coil 220, and a cover 230. The rotor core 210 has a hole at its center, and the rotary shaft 100 is disposed in the hole. The coil 220 is wound around the rotor core 210. Meanwhile, the cover 230 is coupled to the rotor core 210 and rotates integrally with the rotor core 210. The cover 230 may be disposed on one side of the rotor core 210 and on the other side of the rotor core 210, respectively. The cover 230 may include protruding wings (231 in Fig. 3). The wing portion 231 serves as a cooling fan for generating a flow of gas when the rotor 200 rotates. The wing portion 231 may have a predetermined curvature to facilitate the flow of the gas.

The stator 300 induces electrical interaction with the rotor 200 to induce rotation of the rotor 200. The stator 300 includes a stator core 310 and the stator core 310 may be wound with a second coil 320. The stator core 310 is provided with an annular yoke, and a plurality of teeth facing inwardly from the yoke may be provided. In each tooth, the second coil 320 may be wound. The teeth may be provided at regular intervals along the circumference of the yoke.

The housing 400 accommodates the rotor 200 and the stator 300 therein. The housing 400 may include a first housing 400A and a second housing 400B. The first housing 400A is disposed on either side of the stator 300. [ And the second housing 400B is disposed on the other side of the stator 300. [ The first housing 400A and the second housing 400B are coupled to each other through a fastening member. The first housing 400A and the second housing 400B are provided with engaging portions 421, respectively. The fastening member passes through the engaging portion 421 to engage the first housing 400A and the second housing 400B.

A plurality of through holes 3 may be arranged in the first housing 400A and the second housing 400B, respectively. The through hole 3 may be disposed along the circumferential direction of the first housing 400A or the second housing 400B and function as a heat releasing portion for releasing heat generated inside the motor to the outside.

A portion of the stator core 310 may be exposed between the first housing 400A and the second housing 400B. Therefore, the heat generated in the stator unit 300 can be easily discharged to the outside. However, the present invention is not limited thereto.

The process of discharging heat generated in the rotor 200 is as follows.

Referring to FIG. 2, when the rotor 200 rotates, a flow of gas is generated by a wing (231 in FIG. 3) inside the motor. The heat generated in the rotor part 200 is quickly discharged to the outside through the through hole 232 formed in the cover 230 and the through hole 3 formed in the housing 400. [ Such a structure is advantageous for a motor in which a large amount of heat is generated by high-speed rotation.

Fig. 4 is a view showing the housing, and Fig. 5 is a plan view of the housing shown in Fig.

4 and 5, the housing 400 may include a first body 400A and a second body 400B. The second body 400B is disposed on the first body 400A. The second body 400B may be a disc-shaped upper surface, and the second body 400B may be a side surface disposed along the first body 400A. The first body 400A and the second body 400B may be connected to each other through the first rib 430 and the second rib 440. [ A center portion of the first body 400A may be provided with a pocket portion 411 for receiving a bearing (2 in Fig. 2). A hole 411a may be disposed in the center of the pocket portion 411. The rotating shaft 100 passes through the hole 411a.

The plurality of first ribs 430 may extend from the pocket portion 411 to the second housing 420 in the form of a spoke. The plurality of first ribs 430 may be spaced at equal intervals in the circumferential direction with respect to the axial center of the housing 400. For example, as shown in the figure, four first ribs 430 may be arranged at intervals of 90 degrees. The first rib 430 may be connected to the coupling portion 421. For example, the first rib 430 connected to one coupling portion 421 may be a pair of ribs disposed with a coupling hole 421a disposed in the coupling portion 421 therebetween.

The second ribs 440 may be disposed between the neighboring first ribs 430 and the first ribs 430 in the circumferential direction with respect to the axial center of the housing 400. A plurality of second ribs 440 may be disposed apart from each other. Therefore, the space between the first ribs 430 and the second ribs 440, or the space between the second ribs 440 and the second ribs 440, forms the through holes 3 serving as an air inlet or an air outlet.

Fig. 6 is a view showing an arrangement interval of the second ribs.

Of the housing  1st Modifications

The housing 400 according to the first modification is characterized in that the distances b, c, and d of the second ribs 440 are increased as the distance from the first ribs 430 increases with respect to the circumferential direction . For example, referring to FIGS. 5 and 6, when the intermediate point between the neighboring first ribs 430 and the first ribs 430 is referred to as a first point CL, The second ribs 440 are arranged such that the spacings b, c, and d of the second ribs 440 increase from the first rib 430 toward the first point CL to an equal ratio of the first spacing a .

Hereinafter, the term " interval " may mean the length of the arc based on the circumferential direction of the housing 400. [ For example, the length of the arc between the neighboring first ribs 430 and the second rib 440, or the length of the arc between the neighboring second ribs 440, may be referred to as the "gap". The first gap a indicates the distance between the first rib 430 and the second rib 440 immediately adjacent to the first rib 430. [

Specifically, the intervals b, c, and d of the neighboring second ribs 440 are defined by a reference line L that passes through the second rib 440 and represents a circumference having an arbitrary radius R, Represents the length of the arc between the intersections P between the center of the width W of the second rib 440 and the reference line G passing the axis center C of the housing 400. [ At this time, the reference line L may be the inner wall of the second body 400B. Here, the first interval a indicates the length of the arc from the side of the first rib 430 on the reference line L to the center of the second rib 440 immediately adjacent to the first rib 430.

When the number of the second ribs 440 disposed between the neighboring first ribs 430 is an even number, the first spacing a can be calculated by the following equation (1).

Where a is the first spacing, S is the spacing of the adjacent first ribs relative to the circumferential direction, and r is a common ratio. and n is a value obtained by adding one to the number of the second ribs.

When the number of the second ribs 440 disposed between the neighboring first ribs 430 is an odd number, the first distance a can be calculated by the following equation (2).

Where a is the first spacing, S is the spacing of the adjacent first ribs relative to the circumferential direction, r is a common ratio, and n is a value obtained by adding 0.5 to the half value of the number of the second ribs .

7 is a graph comparing the natural frequencies of the motor according to the embodiment and the motor according to the comparative example.

The comparative example of Fig. 7 corresponds to a motor in which the intervals of the second ribs are the same. 7, when the second rib 440 is disposed such that the distance between the second ribs 440 (b, c, d in FIG. 6) increases as the distance from the first ribs 430 increases, It can be seen that the primary natural frequency of the motor according to the embodiment is larger than that of the comparative example in which the second ribs 440 are arranged at the same intervals. Accordingly, the motor according to the embodiment has the advantage of securing the rigidity of the housing 400 to reduce the vibration and reduce the noise radiated from the housing 400. [

Of the housing  Second Modifications

Fig. 8 is a view showing a second modification of the housing, and Fig. 9 is a plan view of the housing shown in Fig.

8 and 9, in the housing 400 according to the second modification, the sectional area A of the first rib 430 is 2.6 to 3.6 times the sectional area B of the second rib 440 have. That is, the cross sectional area ratio (A / B) may be 2.6 to 3.6 or less. Here, the cross-sectional area may be a horizontal cross-sectional area. 9, the second rib 440 is formed such that the reference line T indicating the longitudinal direction thereof forms a certain angle R with the reference line G passing the axis center C of the housing 400 And can be arranged at an angle.

The first rib 430 is connected to the engaging portion 421. The rigidity of the first rib 430 greatly affects not only the natural frequency of the housing 400 but also the overall stiffness of the housing 400 because the engaging portion 421 fastens and supports the housing 400. [ The housing 400 according to the second modification has a feature that the rigidity of the housing 400 is increased and the natural frequency is increased by designing a sectional area ratio of 2.6 to 3.6.

At this time, the first ribs 430 and the second ribs 440 may have uniform horizontal cross-sectional areas along the longitudinal direction.

10 is a graph showing the relationship between the cross sectional area ratio and the natural frequency.

Referring to Fig. 10, when the cross-sectional area ratio A / B is increased from 2.6 to the cross-sectional area ratio A / B by 0.2, the change of the first natural frequency becomes 30 Hz or less. Thus, the cross-sectional area ratio A / B 2.6 is a meaningful minimum criterion in securing the rigidity of the housing 400 in order to reduce noise and vibration.

On the other hand, when the sectional area ratio (A / B) is increased from 3.6 to the sectional area ratio (A / B) by 0.2, the change in the first natural frequency becomes 10 Hz or less. In other words, even when the sectional area ratio A / B is increased, the change of the first natural frequency is not large and converges. Therefore, it can be seen that the housing 400 has the maximum stiffness at a cross-sectional area ratio A / B of 3.6, and the cross-sectional area ratio A / B 3.6 is a criterion for preventing excessive design in the robust design of the housing 400 .

 Thus, when the sectional area ratio A / B of the housing 400 is designed to be 2.6 to 3.6, it is possible to secure the rigidity of the housing 400 for reducing noise and vibration while reducing manufacturing costs.

As described above, the motor according to one preferred embodiment of the present invention has 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.

1: Pulley
2: Bearing
100:
200: Rotor
210: rotor core
220: first core
230: cover
231:
300:
310: stator core
320: second coil
400: housing
400A: first housing
400B: second housing
410: first body
411: pocket portion
420: second body
421:
430: first rib
440: second rib

Claims (19)

A rotating shaft;
A rotor including a hole in which the rotation axis is disposed;
A stator disposed outside the rotor;
A housing for receiving the rotor and the stator,
The housing includes a first body, a second body disposed on the first body, and a plurality of first ribs connecting the first body and the second body,
A plurality of second ribs are disposed between the neighboring first ribs,
The first rib being located at a position between the neighboring first ribs,
Wherein in the circumferential direction, in the first rib, the interval of the second ribs neighboring to the first point increases. The method according to claim 1,
Wherein the first point is an intermediate point of the neighboring first rib with respect to the circumferential direction. 3. The method of claim 2,
Wherein a distance between the first rib and the first rib is smaller than a distance between the second rib and the first rib and a distance between the second rib and the first rib, Lt; RTI ID = 0.0 > 1, < / RTI > The method of claim 3,
And the plurality of second ribs have the same thickness. 5. The method of claim 4,
When the number of the second ribs disposed between the neighboring first ribs is an even number,
Wherein the first interval is calculated by: " (1) "
&Quot; (1) "

Where a is the first spacing, S is the spacing of the neighboring first ribs with respect to the circumferential direction, and r is a common ratio. and n is a value obtained by adding one to the number of the second ribs. 5. The method of claim 4,
When the number of the second ribs disposed between the neighboring first ribs is an odd number,
Wherein the first interval is calculated by the following equation (2).
&Quot; (2) "

Where a is the first spacing, S is the spacing of the adjacent first ribs relative to the circumferential direction, r is a common ratio, and n is a value obtained by adding 0.5 to the half value of the number of the second ribs . The method according to claim 1,
The housing includes a first housing and a second housing,
And the first housing and the second housing each include an engaging portion that engages with each other. 8. The method of claim 7,
And the first rib is connected to the engaging portion. 9. The method of claim 8,
Wherein the plurality of first ribs are spaced at equal intervals with respect to the circumferential direction. 10. The method of claim 9,
Wherein the engaging portion includes a fastening hole,
And the first rib is a pair of ribs connected to the engaging portion with the fastening hole interposed therebetween. The method according to claim 1,
And a bearing for supporting the rotation shaft.
Said housing including a pocket portion for receiving said bay ring. A rotating shaft;
A rotor including a hole in which the rotation axis is disposed;
A stator disposed outside the rotor;
A housing for receiving the rotor and the stator,
The housing includes a first body, a second body disposed on the first body, and a plurality of first ribs connecting the first body and the second body,
A plurality of second ribs are disposed between the neighboring first ribs,
And the cross-sectional area of the first rib is 2.6 to 3.6 times the cross-sectional area of the second rib. 13. The method of claim 12,
The housing includes a first housing and a second housing,
And the first housing and the second housing each include an engaging portion that engages with each other. 14. The method of claim 13,
And the first rib is connected to the engaging portion. 14. The method of claim 13,
Wherein the plurality of first ribs are spaced at equal intervals with respect to the circumferential direction. 13. The method of claim 12,
And the second rib is disposed at an angle to a reference line extending in a radial direction with respect to a center of the housing. 14. The method of claim 13,
Wherein the engaging portion includes a fastening hole,
And the first rib is a pair of ribs connected to the engaging portion with the fastening hole interposed therebetween. 13. The method of claim 12,
And the plurality of second ribs have the same thickness. 13. The method of claim 12,
And a bearing for supporting the rotation shaft.
Said housing including a pocket portion for receiving said bay ring.

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