KR20160083231A

KR20160083231A - Core for motor

Info

Publication number: KR20160083231A
Application number: KR1020140193353A
Authority: KR
Inventors: 구자춘
Original assignee: 주식회사 승정
Priority date: 2014-12-30
Filing date: 2014-12-30
Publication date: 2016-07-12

Abstract

The purpose of the present invention is to provide a core for a motor capable of improving the performance of the motor by forming grooves located between poles of an inner circumference of a mounting hole for mounting a rotor and making magnetic flux flowing along the poles move toward the center of the core to minimize a leakage of the magnetic flux obtained through the core. Specially, Another purpose of the present invention is to provide the core for a motor capable of minimizing leakage magnetic flux by forming grooves by cutting out a remaining part except for a space between virtual lines formed by extending poles with respect to the core to make an inner end of the pole protrude toward the mounting hole, and making the magnetic flux obtained through the poles flow toward the center of the core not to be leaked outward. And, the other purpose of the present invention is to provide the core for a motor capable of improving motor performance by reducing the friction of air generated between the mounting hole and the rotor due to the rotation of the rotor mounted in the mounting hole by forming grooves in the mounting hole made to keep a predetermined distance from the rotor, and capable of obtaining air cooling effects by supplying a large amount of air into the motor.

Description

Core for motor {CORE FOR MOTOR}

The present invention relates to a motor core, and more particularly, to a motor core, in which a groove is formed on the inner surface of a mounting hole formed in a core for mounting a rotor, and a magnetic flux flowing along a pole faces a center of the core, Thereby minimizing the leakage magnetic flux and improving the motor performance.

Generally, a motor includes a stator mounted on a body and a rotor mounted rotatably in the stator. At this time, a coil is wound around the stator and the rotor to obtain a magnetic flux, respectively, or permanent magnets are mounted.

On the other hand, a stator using an electromagnet causes a plurality of cores having a predetermined thickness to overlap with each other and to act like an iron core through which magnetic flux can pass, in order to increase the rotational force of the motor. The following Patent Documents 1 to 3 disclose techniques relating to a core used in a stator.

Patent Document 1 relates to a method for manufacturing a core of a motor for a washing machine, in which a pair of core bands are punched out in a state in which the teeth cross each other while facing each other, and the core bands are wound After the ring-shaped core is provided, the inner surface of the core is welded with a fastening portion to be fastened with a bolt, so that the electric steel sheet can be used as much as possible, and the manufacturing process is easy.

Patent Document 2 relates to a stator core of an outer rotor type motor for a washing machine and includes a yoke having an annular band shape having a predetermined curvature and a yoke protruding outward in the radial direction from the outside in the radial direction of the yoke, Wherein the stator core is formed by connecting a plurality of arcuate core pieces to each other, wherein the stator core is formed by connecting core pieces having a circular arc shape, A yoke portion having a straight strip shape; a core tooth portion protruding in one direction from one side in the width direction of the yoke portion and having a slot portion formed therebetween and spaced apart at a predetermined pitch in the longitudinal direction of the yoke portion; A yoke having a coupling concave portion and a convex portion which are formed so as to be male and female at both side end portions in the longitudinal direction of the yoke portion, Wherein the core steel plate is laminated on the core steel plate and the core steel plate is positioned outside in the radial direction and the core steel plate is subjected to bending deformation such that the curvature of the yoke portion is the same as that of the yoke of the stator core .

Patent Document 3 relates to a motor core, which comprises a core body integrally formed at a central portion, a protruded portion protruding from the outer circumferential surface of the core body at one side thereof and wound with a coil, A core comprising a tooth; And a rotor magnet formed to face the teeth of the core so as to face each other, wherein the teeth are formed to be inclined in a rotation direction of the motor. According to the present invention, in the portion where the end of the core of the motor and the permanent magnet face each other, the teeth of the core are slanted in the rotation direction of the motor, thereby reducing the occurrence of cogging torque.

These existing motor cores are manufactured as follows. 1, the conventional core 10 is manufactured in the form of a disk having a predetermined thickness, and a mounting hole 11 is formed at the center for allowing the rotor R to rotate at a predetermined interval . A plurality of slots 12 are formed at equal intervals on the outer circumference of the core 10 so that the coils are wound around the poles 13 formed between two neighboring slots 12, So that the magnetic flux flows toward the center of the core 10. FIG. 1 shows an example in which six slots 12 and a plurality of pawls 13 are formed.

Conventional cores are made by stacking a plurality of sheets one by one and winding coils around each pole to produce a stator. The conventional core thus produced has the following problems.

(1) The magnetic flux which influences the performance of the motor flows toward the center of the core along the pole as shown in Fig. However, existing cores leak part of this flux flow to both sides of the core.

(2) That is, the existing core can minimize the flux of the magnetic flux when the magnetic flux flows as shown by the red arrows facing each other in the yellow part in FIG. However, in the actual flux flow, a leakage magnetic flux is generated in the right and left sides of the extending portion of the pole, as in a red circle indicated by an arrow.

(3) This is caused by forming a mounting hole for mounting the rotor in a circular shape. That is, the magnetic flux travels along the core, preferably the pole. In the conventional core, since the inner ends of these poles are integrally formed with each other, flux leakage occurs to both sides of the pole through the integrally manufactured portion.

(4) Therefore, in order to improve the performance of the motor, it is required to develop a core capable of minimizing such leakage magnetic flux.

Korean Registered Patent No. 0484817 (Registered on Apr. 13, 2005) Korean Patent Laid-Open No. 10-2013-0052998 (Published on 2013.05.23) Korean Patent No. 0969699 (Registered on July 7, 2010)

The present invention has been made in view of the above points, and it is an object of the present invention to provide a rotor having a structure in which grooves are formed on the inner edge of a mounting hole for mounting a rotor so as to be positioned between the poles, The present invention provides a core for a motor that can minimize the leakage amount of magnetic flux obtained through a magnetic core, thereby enhancing motor performance.

Particularly, according to the present invention, a groove is formed by cutting the remaining portion except for the imaginary line extending from the center of the pole to the center of the core, so that the inner end of the pole protrudes into the mounting hole, The core for the motor is made to be able to minimize leakage magnetic flux by preventing leakage outward toward the center of the core through the core.

According to the present invention, a groove is formed in a mounting hole formed so as to maintain a predetermined gap with the rotor, so that air friction generated between the mounting hole and the rotor is reduced by rotation of the rotor mounted on the mounting hole, There is a further object to provide a core for a motor which can not only increase the airflow rate but also can supply a large amount of air and can expect a cooling effect.

In order to achieve the above object, a motor core according to the present invention includes a mounting hole 110 formed at a center of a rotor R, and a plurality of slots 120 formed at an outer circumferential surface at regular intervals A flow F of magnetic flux flowing through the pawl 130 is formed on the inner surface of the mounting hole 110 in the core for a motor in which a pole 130 is formed between two neighboring slots 120, And the groove 111 is formed so as to be positioned between two adjacent pawls 130 facing the center.

Particularly, each of the grooves 111 is formed such that a portion between imaginary lines L extending from the center of the pawl 130 to the center thereof is formed to protrude inward of the mounting hole 110.

Finally, the motor core is a core for a BLDC motor.

The motor core according to the present invention has the following effects.

(1) The magnetic flux flowing along the pole can be guided toward the center of the core through the protruding portion between the grooves formed in the mounting hole, so that the leakage magnetic flux can be minimized.

(2) In particular, since the magnetic flux is proportional to the motor performance such as the torque and the torque of the motor, it is possible to increase the motor performance by minimizing the leakage magnetic flux.

(3) Since the grooves are formed as described above, a space between the mounting hole and the rotor mounted thereon is widened to allow a large amount of air flow, thereby reducing the air friction that may occur between the mounting holes and the rotor.

1 is a plan view for explaining the structure of a conventional core;
FIG. 2 is a plan view showing a flow state of magnetic flux in a core made of a conventional core; FIG.
3 is a plan view for explaining the structure of a core according to the present invention.
4 is an enlarged view of a part of a core in order to explain an example of forming a groove according to the present invention.
5 is a plan view showing a flow state of a magnetic flux in a core made of the core according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should properly define the concept of the term to describe its invention in the best possible way The present invention should be construed in accordance with the spirit and scope of the present invention.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Thus, various equivalents And variations may be present.

(Configuration)

3 to 5, the motor core 100 according to the present invention has a groove 111 formed in a mounting hole 110 formed at the center for mounting the rotor R, The magnetic flux flow F generated in the pawl 130 located within the core 100 concentrates toward the center of the core 100, thereby minimizing the magnetic flux leaked to both sides of the core portion, thereby enhancing the motor performance.

As the space between the mounting hole 110 and the rotor R is widened due to the formation of the grooves 111, much airflow is generated in the present invention and the rotation friction of the rotor R due to air friction So that the air-cooling effect can be expected together.

Hereinafter, this configuration will be described in more detail as follows.

The core 100 is formed into a disc shape having a predetermined thickness as shown in Fig. At the center, a mounting hole 110 is formed to allow the rotor R, which is generally known as a rotor, to be inserted and rotated.

As shown in FIG. 3, the core 100 is formed with a plurality of slots 120 at predetermined intervals on the outer edge thereof. At this time, the slot 120 is formed so as not to be pulled out from the pole 130 by winding the coil C as shown in FIG.

3 and 4, the pole 130 refers to a portion separating two neighboring slots 120 and the coil C is a portion between two neighboring slots 120 as shown in FIG. 4, So as to wrap the pole 130. Therefore, when power is supplied to the coil C, a flow F of the magnetic flux occurs as indicated by arrows along the inside of the coil, that is, the pole 130 like a circular coil. At this time, the coil C winds the magnetic flux along the pole 130 toward the center of the core 100.

On the other hand, in the present invention, as shown in Figs. 3 and 4, a plurality of grooves 111 are formed on the inner surface of the mounting hole 110 at predetermined intervals. At this time, it is preferable that the grooves 111 are formed so that the flow F of the magnetic flux flowing through the pawls 130 does not deviate as far as possible from the center of gravity toward the center of the core 100, as described above.

For this purpose, it is preferable that the groove 111 is formed between two pawls 130. That is, the groove 111 is formed by cutting the inner surface of the mounting hole 110 by the portion where the slot 120 is formed, so that the end of the portion of the pole 130 formed adjacent to the slot 120, (110). &Lt; / RTI >

In the preferred embodiment of the present invention, the grooves 111 are preferably formed by the number of slots 120, as shown in FIG. In the drawing, six slots 120 and six grooves 111 are formed.

In the preferred embodiment of the present invention, the groove 111 is formed by extending the respective pawls 130 to the position of the virtual line L extending toward the center of the core 100 as shown in Fig. 4, The portion protruding from the mounting hole 110 has the same width as that of the pawl 130 so that the flow F of the magnetic flux through the pawl 130 is made uniform so that the magnetic flux can be prevented from leaking to both sides thereof .

4 and 5, the groove 111 is formed in the mounting hole 110 so that the inner end of the pawl 130 protrudes into the mounting hole 110 So that the flow F of the magnetic flux generated through the pawl 130 can be concentrated toward the center of the core 100 through the protruding portion to increase the efficiency of the motor.

3, the effect of increasing the amount of air between the mounting hole 110 and the rotor R by the size of the mounting hole 110 can be expected in the present invention, have. This can reduce the air resistance that may occur when the rotor R rotates due to a narrow gap between the mounting hole 110 and the rotor R, as well as providing a sufficient amount of air to expect the air cooling effect.

The present invention can be applied to any motor using a core. Among them, the core according to the present invention is preferably applied to a BLDC motor.

100: Core
110: Mounting hole
111: Home
120: Slot
130: Paul

Claims

A mounting hole 110 is formed at the center of the rotor R and a plurality of slots 120 are formed at regular intervals on the outer edge of the mounting hole 110. Thus, In the motor core,
A groove 111 is formed on the inner surface of the mounting hole 110 so as to be positioned between two adjacent pawls 130 so that a flow F of the magnetic flux flowing through the pawl 130 faces the center of the core. And a core for the motor.

The method according to claim 1,
Each of the grooves (111)
And a portion between the imaginary lines (L) extending from the center of the pole (130) toward the center of the pole (130) protrudes toward the inside of the mounting hole (110).

3. The method according to claim 1 or 2,
Wherein the motor core is a BLDC motor core.