KR20170048014A - Rotor plate, rotor assembly and motor having same - Google Patents

Abstract

The present invention provides a rotor plate. The rotor plate includes an inner portion forming the inner surface of the pocket; a first bridge portion and a second bridge portion extended from the inner surface and forming both side surfaces of the pocket, respectively; and an outer portion forming the outer surface of the pocket and connected to only one of the first bridge portion and the second bridge portion. Magnetic flux leaking to an adjacent magnet is blocked, thereby ensuring the performance of a motor.

Description

[0001] The present invention relates to a rotor plate, a rotor assembly, and a motor including the rotor plate,

The present invention relates to a rotor plate, a rotor assembly and a motor including the rotor plate, and more particularly, to a rotor plate, a rotor assembly, and a motor including the rotor plate, including a pocket portion into which a magnet is inserted.

The motor generates power by rotating by the interaction between the rotor having the plurality of magnets and the electromagnetic force generated by the coil wound on the stator.

Accordingly, the motor is provided with a shaft rotatably formed, a rotor coupled to the shaft, and a stator fixed to the inside of the housing, the stator being installed with a gap along the circumference of the rotor.

A coil for forming a rotating magnetic field is wound on the stator to induce electrical interaction with the rotor to induce rotation of the rotor. Therefore, when the rotor rotates, the shaft rotates.

The rotor is provided with a plurality of magnets. According to the magnet mounting method, an IPM (Inner Permanent Magnet) motor in which a magnet is inserted and coupled to the inside of the rotor core, a SPM (Surface Permanent Magnet) Respectively.

In the case of the IPM motor, there is a problem that the magnetic flux of the magnet inserted into the pocket portion leaks. The magnetic flux in the radial direction of the magnet is directed to the magnet of the other adjacent pole. When the leakage magnetic flux occurs, there is a problem that the performance of the motor is greatly deteriorated.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a rotor plate capable of minimizing a leakage magnetic flux and ensuring the performance of a motor. And a motor including the rotor assembly.

The problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned here can be understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a pouch comprising: an inner side portion forming an inner side surface of the pocket; a first bridge portion and a second bridge portion extending from the inner side surface to form both side surfaces of the pocket, The rotor plate may include a first bridge portion and a second bridge portion. The first bridge portion and the second bridge portion may be connected to each other.

Preferably, an air gap may be formed on at least one of both sides of the pocket.

Preferably, the length of the inner surface of the pocket and the length of the outer surface of the pocket are formed identically.

According to another aspect of the present invention, there is provided a pouch comprising: an inner side portion forming an inner side surface of a pocket; a first bridge portion extending from the inner side surface to form both side surfaces of the pocket and a second bridge portion; And a rotor plate including an outer portion connected to only one of the first bridge portion and the second bridge portion. The rotor core includes a plurality of rotor plates stacked, and a magnet inserted into the pocket. To provide a rotor assembly.

Preferably, the rotor plate may include a first rotor plate having the outer portion connected to the first bridge portion and a second rotor plate having the outer portion connected to the second bridge portion.

Preferably, the first rotor plate and the second rotor plate are alternately stacked.

Preferably. The first rotor plate and the second rotor plate may be formed symmetrically with respect to a virtual reference line.

Preferably, an air gap may be formed on at least one of both sides of the pocket.

Preferably, the first rotor plate is formed with an air gap in only the first bridge portion of the first bridge portion and the second bridge portion.

Preferably, the second rotor plate is formed with a gap portion in only the second bridge portion of the first bridge portion and the second bridge portion.

According to another aspect of the present invention, there is provided a pouch comprising: an inner side portion forming an inner side surface of the pocket; a first bridge portion and a second bridge portion extending from the inner side surface to form both side surfaces of the pocket, A rotor assembly including a plurality of rotor plates stacked on one another, the rotor assembly including a rotor plate including an outer side portion and an outer side portion connected to only one of the first bridge portion and the second bridge portion; And a shaft coupled to the rotor assembly.

Preferably. The rotor plate may include a first rotor plate having the outer portion connected to the first bridge portion and a second rotor plate having the outer portion connected to the second bridge portion.

Preferably, the first rotor plate and the second rotor plate are alternately stacked.

Preferably, the first rotor plate and the second rotor plate may be formed symmetrically with respect to a virtual reference line.

Preferably, air gaps may be formed on both sides of the pocket.

Preferably. The first rotor plate may have an air gap formed in only the first bridge portion of the first bridge portion and the second bridge portion.

Preferably, the second rotor plate is formed with a gap portion in only the second bridge portion of the first bridge portion and the second bridge portion.

According to an embodiment of the present invention, any one of the two bridge portions connecting the inner side portion and the outer side portion to constitute the pocket is formed so as to be disconnected from the outer side portion to block the magnetic flux leaked to the adjacent magnet, To provide an advantageous effect.

In addition, according to an embodiment of the present invention, there is provided an advantageous effect of securing the supporting force of the pocket with respect to the magnet while shielding the leakage magnetic flux by cross-stacking the rotor plates having different gaps.

1 shows a motor according to a preferred embodiment of the present invention,
Figure 2 shows a rotor core,
3 shows a rotor core comprising a plurality of rotor plates,
Figure 4 shows a first type of rotor plate,
Figure 5 shows a second type of rotor plate,
Figure 6 shows a first type rotor plate and a second type rotor plate being symmetrically formed,
7 is a plan view of a rotor core in which rotor plates are cross-
8 is a table comparing the torques of the motors,
9 is a view showing the flow of magnetic flux of a conventional rotor plate,
10 is a view showing the flow of the magnetic flux of the rotor plate of the first type,
11 is a view showing the flow of the magnetic flux of the rotor plate of the first type.

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.

1 is a view showing a motor according to a preferred embodiment of the present invention.

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

The stator 200 is coupled to the housing and the rotor assembly 100 is disposed inside the stator 200. A shaft 300 may be coupled to the center of the rotor assembly 100. A coil is wound around the stator 200 to have magnetic poles, and the rotor assembly 100 is rotated by the magnetic field formed by the coil winding, and the shaft 200 is rotated at the same time.

First, the stator 200 may include a plurality of stator cores. For example, the stator core may be constituted by stacking a plurality of steel plates including an annular yoke portion and a portion of the stator teeth which are arranged along the circumferential direction and protruded from the yoke radially inwardly at regular angular intervals . The coil forming the rotating magnetic field can be wound on such a stator tooth. At this time, the coil can be insulated through the insulator.

The rotor assembly 100 is disposed inside the stator 200. The rotor assembly 100 may include a magnet 120 coupled to the rotor core 110. Specifically, a magnet may be inserted into a pocket provided in the rotor core 110. On the upper side of the rotor assembly 100, a sensing magnet for acquiring positional information of the rotor assembly 100 may be coupled to the plate, or similar rotor position sensing means may be installed. Both ends of the shaft 200 can be rotatably supported by bearings.

FIG. 2 is a view showing a rotor core, and FIG. 3 is a view showing a rotor core composed of a plurality of rotor plates.

2 and 3, the rotor core 110 may include a plurality of rotor plates 110a stacked one upon the other. Each of the rotor plates 110a may be formed with a pocket 10 and a shaft hole 20.

The plurality of pockets 10 are arranged at regular intervals along the circumferential direction. The magnet (120) is inserted into the pocket (10). The shaft hole 20 may be formed at the center of the rotor plate 110.

4 is a view showing a rotor plate of the first type. It should be noted that, in order to clearly understand the present invention conceptually, Fig. 4 clearly shows only main feature parts, and as a result various variations of the illustration are expected, and the scope of the present invention is limited by the specific shapes shown in the drawings There is no.

Referring to FIG. 4, the rotor plate 110a may include a medial portion 111, a first bridge portion 112, a second bridge portion 113, and a lateral portion 114. The inner side portion 111, the first bridge portion 112, the second bridge portion 113 and the outer side portion 114 can be separately described according to their shape and functional characteristics, It is means.

The inner region of the pocket 10 is defined as the inner region 111 and the outer region of the pocket 10 is defined as the outer region 114 with respect to the pocket 10. The medial portion 111 and the lateral portion 114 may be physically connected by the first bridge portion 112 or the second bridge portion 113.

The inner side 111 forms the inner side 11 of the pocket 10. The outer portion 114 defines an outer surface 12 of the pocket 10. The first bridge portion 112 and the second bridge portion 113 may form both side surfaces 13 of the pocket 10, respectively. The first bridge portion 112 and the second bridge portion 113 may extend from the inner side portion 111 in the radial direction of the rotor plate 110a. Here, the first bridge portion 112 and the second bridge portion 113 refer to the reference line CL passing through the center C of the rotor plate 110a and passing through the center of the width of the pocket 10 as a reference The bridge portion located on the left side is referred to as a first bridge portion 112 and the bridge portion located on the right side is defined as a second bridge portion 113. [

The length W2 of the inner side surface 11 of the pocket 10 and the length W1 of the outer side surface 12 of the pocket 10 may be the same.

The rotor plate 110a may be divided into a first type rotor plate and a second type rotor plate according to the direction of the gap G to be described below.

The outer side portion 114 of the rotor plate 110a of the first type may be connected only to the first bridge portion 112 and the second bridge portion 113 of the second bridge portion 113. [ Therefore, the first bridge portion 112 and the outer portion 114 are disconnected, and a gap as shown by G in FIG. 4 is generated. The gap G serves to prevent magnetic flux from leaking from the magnet 120 installed in the pocket 10 to the magnet 120 installed in the pocket 10 adjacent to the left.

On the other hand, air gaps 14 may be provided on both sides of the pocket 10, respectively. 4, since the gap 14 formed on the left side of the pocket 10 is connected to the gap G, the pocket 10 can be formed to be connected to the outside of the rotor plate 110a. The left side of the pocket 10 in which the gap G is formed may be formed in a form in which the void portion 14 is omitted.

5 is a view showing a rotor plate of a second type. It is to be noted that, in order to clearly understand the present invention conceptually, Fig. 5 clearly shows only main feature parts, and as a result various variations of the illustrations are expected, and the scope of the present invention is limited There is no.

The outside portion 114 of the rotor plate 110b of the second type may be connected only to the first bridge portion 112 and the first bridge portion 112 of the second bridge portion 113. Accordingly, the second bridge portion 113 and the outer portion 114 are disconnected, and a gap as shown in FIG. 5G is generated. The gap G serves to prevent magnetic flux from leaking from the magnet 120 installed in the pocket 10 adjacent to the right side of the magnet 120 installed in the pocket 10. [

On the other hand, air gaps 14 may be provided on both sides of the pocket 10, respectively. 5, since the gap 14 formed on the right side of the pocket 10 is connected to the gap G, the pocket 10 may be formed to be connected to the outside of the rotor plate 110a. The right side of the pocket 10 in which the gap G is formed may be formed in a form in which the void portion 14 is omitted.

6 is a view showing a first type rotor plate and a second type rotor plate which are symmetrically formed;

Referring to FIG. 6, the first type rotor plate 110a may be formed symmetrically with the second type rotor plate 110b. Specifically, the first type rotor plate 110a and the second type rotor plate 110b are symmetrical with respect to the imaginary reference line H and are formed in the same shape only with the directionality of the gap G being different from each other .

7 is a plan view of a rotor core in which rotor plates are cross-laminated.

The rotor core 110 may be formed by alternately stacking the first type rotor plate 110a and the second type rotor plate 110b.

2 and 7, in the manufacture of the rotor core 110, the gap G of the first type rotor plate 110a and the gap G of the second type rotor plate 110b, In order to ensure the structural stability of the rotor core as a whole while securing a gap G for shielding the leakage magnetic flux from the magnet to the adjacent magnet in view of the rotor plate.

If the gaps G at the same position are repeated with respect to the circumferential direction in the course of lamination of the rotor plates, the coupling between the inner part 111 and the outer part 114 may deteriorate. When the gap G has a different directionality, the gap G of the rotor plate 110a can be sealed, so that the structural integrity of the entire rotor core 110 for holding the magnet in the pocket can be secured.

In describing the present invention, The rotor core 110 is formed by alternately stacking the first type rotor plate 110a and the second type rotor plate 110b. However, the present invention is not limited to this, 110a may be laminated to form the rotor core 110 or only the rotor plate 110b of the second type may be laminated to form the rotor core 110. [

Also, after the plurality of first type rotor plates 110a are stacked, the rotor core 110 may be repeatedly inserted into the rotor core 110 by repeating the insertion of one or more second type rotor plates 110b.

Hereinafter, the leakage magnetic flux blocking effect that is obtained by applying the rotor plate of the present invention will be described with reference to FIGS. 8 to 11. FIG.

Fig. 8 is a table for comparing the torques of the motors. FIG. 9 is a view showing the flow of magnetic flux of the conventional rotor plate, FIG. 10 is a view showing the flow of magnetic flux of the first type rotor plate, and FIG. Fig.

Referring to Part A of FIG. 8, it can be seen that the torques of the L-type motor and the R-type motor are relatively larger than those of the conventional motor.

Here, the conventional motor means a motor including a rotor core composed of a rotor plate of which the outer side portion 114 is connected to both the first bridge portion 112 and the second bridge portion 113. The L type motor means a motor including a rotor core in which only the first type rotor plate 110a is laminated. The R type motor means a motor including a rotor core in which only a rotor plate 110b of the second type is laminated.

Referring to FIG. 9, in the case of a conventional rotor plate, a magnetic flux leaks through a bridge portion and a magnet portion adjacent to the magnet portion in the direction of an arrow through the outer portion, resulting in loss of magnetic flux.

Referring to FIG. 10, it can be seen that, in the case of the rotor plate of the first type, since the gap G exists on the left side, the magnetic flux leaking to the left is blocked. Referring to FIG. 11, in the case of the rotor plate of the second type, since the gap G exists on the right side, it can be seen that the magnetic flux leaked to the right is blocked.

The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown.

It will be apparent to those skilled in the art that various modifications, substitutions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. will be. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not to limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

10: Pocket
11: My side
12: Outer side
13: Side
14:
20: Shaft hole
100: rotor assembly
110: rotor core
110a: rotor plate
111: medial side
112: first bridge portion
113: second bridge portion
114:
120: Magnet
200:
300: shaft

Claims (17)

An inner portion forming an inner surface of the pocket;
A first bridge portion and a second bridge portion extending from the inner side surface to form both side surfaces of the pocket,
And an outer side portion connected to only one of the first bridge portion and the second bridge portion,
≪ / RTI > The method according to claim 1,
Wherein a gap is formed in at least one of both sides of the pocket. 3. The method of claim 2,
Wherein the length of the inner side surface of the pocket and the length of the outer side surface of the pocket are formed identically. A first bridging portion and a second bridging portion extending from the inner side to form both side surfaces of the pocket and an outer side surface of the pocket, wherein the first bridging portion and the second bridging portion form an outer surface of the pocket, A rotor core including a rotor plate including an outer portion connected to only one of the second bridge portions, the rotor core comprising a plurality of rotor plates stacked;
The magnet inserted into the pocket
, ≪ / RTI > 5. The method of claim 4,
The rotor plate
A first rotor plate having the outer side connected to the first bridge portion and a second rotor plate having the outer side connected to the second bridge portion. 6. The method of claim 5,
Wherein the first rotor plate and the second rotor plate are alternately laminated. The method according to claim 6,
Wherein the first rotor plate and the second rotor plate are formed symmetrically with respect to an imaginary reference line. 5. The method of claim 4,
Wherein a gap is formed in at least one of both sides of the pocket. 6. The method of claim 5,
Wherein the first rotor plate has an air gap formed in only the first bridge portion of the first bridge portion and the second bridge portion. 6. The method of claim 5,
Wherein the second rotor plate has an air gap formed in only the second bridge portion of the first bridge portion and the second bridge portion. A first bridge portion and a second bridge portion extending from the inner side to form both side surfaces of the pocket, and an outer side surface of the pocket, wherein the first bridge portion and the second bridge portion form an inner side surface of the pocket, And a rotor plate including an outer portion connected to only one of the second bridge portions, wherein a plurality of the rotor plates are stacked;
A stator disposed outside the rotor assembly;
The shaft coupled to the rotor assembly
/ RTI > 12. The method of claim 11,
The rotor plate
A motor including a first rotor plate having the outer side connected to the first bridge portion and a second rotor plate having the outer side connected to the second bridge portion, 13. The method of claim 12,
Wherein the first rotor plate and the second rotor plate are alternately laminated. 14. The method of claim 13,
Wherein the first rotor plate and the second rotor plate are mutually symmetrical with respect to a virtual reference line. 12. The method of claim 11,
And a gap is formed in at least one of both sides of the pocket. 13. The method of claim 12,
Wherein the first rotor plate has an air gap formed in only the first bridge portion of the first bridge portion and the second bridge portion. 13. The method of claim 12,
Wherein the second rotor plate has an air gap formed in only the second bridge portion of the first bridge portion and the second bridge portion.

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