KR20090007051A - The rotor structure for interior type permanent magnet motor - Google Patents

The rotor structure for interior type permanent magnet motor Download PDF

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Publication number
KR20090007051A
KR20090007051A KR1020070070656A KR20070070656A KR20090007051A KR 20090007051 A KR20090007051 A KR 20090007051A KR 1020070070656 A KR1020070070656 A KR 1020070070656A KR 20070070656 A KR20070070656 A KR 20070070656A KR 20090007051 A KR20090007051 A KR 20090007051A
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South Korea
Prior art keywords
permanent magnet
rotor
grooves
groove
rotor structure
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KR1020070070656A
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Korean (ko)
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KR100908126B1 (en
Inventor
임태빈
유병강
남윤호
안정호
송혁진
김홍석
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(주)모터넷 인터내셔날
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
    • H02K2201/09—Magnetic cores comprising laminations characterised by being fastened by caulking

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)

Abstract

A rotor structure of interior permanent magnet motor is provided to cogging torque and torque ripple due to a permanent magnet by forming a groove in outer side of a rotor. A rotor structure of interior permanent magnet motor comprises a plurality of permanent magnets(2) and a rotor shaft(3). A plurality of permanent magnets is formed inside of a rotor(1). The rotor shaft is formed in a center of the rotor. One central groove(5) is formed in each permanent magnet. Both side grooves(6) are formed in each permanent magnet. The central groove and both side grooves are formed with length direction. An angle between the central groove and the both side grooves is an electrical angle of 35°~55°. The number of central groove is the same with the number of magnetic pole formed by the permanent magnet. The number of both side grooves is two times of the number of central groove.

Description

매입형 영구자석 전동기의 회전자 구조 {The Rotor Structure for Interior Type Permanent Magnet Motor}Rotor Structure for Embedded Permanent Magnet Motor

도 1은 종래의 매입형 영구자석 전동기의 회전자의 단면도이다. 1 is a cross-sectional view of a rotor of a conventional embedded permanent magnet motor.

도 2는 본 발명의 매입형 영구자석 전동기의 회전자의 단면도이다. 2 is a cross-sectional view of the rotor of the embedded permanent magnet motor of the present invention.

도 3은 측정된 코깅 토크의 비교치를 나타내는 그래프이다. 3 is a graph showing a comparison of measured cogging torques.

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

1 : 회전자 2 : 영구자석1: rotor 2: permanent magnet

3 : 회전자축 5 : 중앙홈3: rotor shaft 5: center groove

6 : 양측홈 ∂ : 중앙홈과 양측홈간의 사이각6: Both grooves ∂: Angle between center groove and both grooves

본 발명은 매입형 영구자석 전동기의 회전자 구조에 관한 것이다. 더욱 자세하게는 전동기 회전자 외측의 특정 부위에 적당한 크기의 홈을 팜으로써 영구 자석 전동기에서 발생하는 코깅 토크(Cogging Torque)를 줄일 수 있는 매입형 영구자석 전동기의 회전자 구조에 관한 것이다.The present invention relates to a rotor structure of an embedded permanent magnet motor. More particularly, the present invention relates to a rotor structure of an embedded permanent magnet motor which can reduce cogging torque generated in a permanent magnet motor by digging a groove of a suitable size in a specific portion outside the motor rotor.

일반적으로 모터는 고정자와 회전자로 구성되며, 고정자에 동선(銅線)을 감아 권선을 하며 회전자에는 영구자석(마그네트)을 내장하고 있다. 이러한 모터의 적층코어와 결합된 영구자석의 상호 작용에 의하여 전동기는 필연적으로 코깅 토크(Cogging Torque)가 발생한다. 이러한 코깅 토크는 회전자와 고정자 사이에 발생하는 자기력의 일종으로, 불균등하게 자기력이 분포하게 되어 진동 및 소음에 영향을 미칠 수 있다.In general, a motor is composed of a stator and a rotor, and a winding is wound around a stator, and a rotor includes a permanent magnet (magnet). Due to the interaction of the permanent magnets coupled with the laminated core of the motor, the motor inevitably generates cogging torque. The cogging torque is a kind of magnetic force generated between the rotor and the stator, and the magnetic force is unevenly distributed, which may affect vibration and noise.

도 1은 종래의 매입형 영구자석 전동기의 회전자 구조를 나타낸다. 이 회전자(1)는 다수개의 영구자석(2)이 내장되고, 회전자의 중앙에은 회전자축(3)이 형성된다. 그리고 마그네트 주면에는 마그네트의 자속을 제어하는 배리어(7)로 구성된다. 이 배리어(7)의 형상을 가지고 코깅 토크를 저감 시킬 수 있으나, 이에 의한 효과는 미비하다.1 shows a rotor structure of a conventional embedded permanent magnet motor. The rotor 1 is provided with a plurality of permanent magnets 2, the rotor shaft 3 is formed in the center of the rotor. And the main surface of the magnet is composed of a barrier (7) for controlling the magnetic flux of the magnet. Although the shape of this barrier 7 can be reduced cogging torque, the effect by this is insignificant.

이러한 코깅 토크를 줄이기 위한 방법으로 스큐(Skew), 슬롯 및 극수의 증가, 낮은 자석밀도의 영구자석을 사용하거나 보조슬롯을 설치하는 방법이 있으나, 이러한 종래의 방법 등은 제작 단가가 높거나 생산효율이 낮으며, 낮은 자석밀도의 영구자석을 사용할 경우 전동기의 부피가 커지게 되는 치명적인 문제점이 있다. As a way to reduce the cogging torque, there is a method of using skew, increasing the number of slots and poles, using a permanent magnet of low magnet density or installing an auxiliary slot, but such a conventional method has a high manufacturing cost or a high production efficiency. This low, there is a fatal problem that the volume of the motor becomes large when using a permanent magnet of low magnetic density.

본 발명은 상기와 같은 종래기술의 문제점을 해결하기 위해 안출한 것으로, 본 발명의 목적은 기존 전동기와 동일한 재료를 사용하고 회전자에 홈을 생성하여 코깅 토크를 효과적으로 감소시킬 수 있는 매입형 영구자석 전동기의 회전자 구조 를 제공하는 데에 있다. The present invention has been made to solve the problems of the prior art as described above, an object of the present invention is to use the same material as the existing electric motor and to create a groove in the rotor to effectively reduce the cogging torque buried permanent magnet It is to provide the rotor structure of the motor.

본 발명의 목적을 구현하기 위한 본 발명의 매입형 영구자석 전동기의 회전자 구조는 영구자석이 고정자 방향으로 형성하는 자극(磁極)의 중앙 부분에 일정한 폭을 가지는 다수개의 중앙홈과, 상기 중앙홈을 중심으로 양측에 대칭되게 일정한 각도를 가지고 형성되는 두 개의 양측홈로 구성하는 것을 특징으로 한다.The rotor structure of the embedded permanent magnet electric motor of the present invention for realizing the object of the present invention comprises a plurality of central grooves having a constant width in the central portion of the magnetic pole formed by the permanent magnet in the stator direction, and the central groove It is characterized by consisting of two grooves formed with a predetermined angle symmetrically on both sides with respect to.

상기 중앙홈과 양측홈간의 사이각(∂)은 35°내지 55°로 하되, 하나의 자극을 180°로 보는 전기각(電氣角)으로 봤을 때, 45°인 것이 바람직하다. 상기 중앙홈과 양측홈의 형상은 회전자의 길이방향으로 길게 형성되는 것을 특징으로 한다. The angle ∂ between the center groove and both grooves is 35 ° to 55 °, but it is preferable that the angle is 45 ° in view of the electric angle of 180 ° as one magnetic pole. The shape of the center groove and both side grooves is characterized in that it is formed long in the longitudinal direction of the rotor.

이하, 본 발명의 실시예를 첨부된 도면에 의해 상세히 설명한다.Hereinafter, with reference to the accompanying drawings an embodiment of the present invention will be described in detail.

도 2는 본 발명의 매입형 영구자석 전동기의 회전자의 단면도이다. 2 is a cross-sectional view of the rotor of the embedded permanent magnet motor of the present invention.

도 2는 본 발명의 핵심인 홈을 생성한 회전자(1)의 구조를 나타낸다. 회전자(1)의 내부는 영구자석(2)이 다수개 형성되고, 회전자(1)의 중앙에는 회전자축(3)이 형성된다. 본 발명의 실시예에서는 영구자석(2) 3쌍이 대칭적으로 배열되어 원주안에 총 6개의 영구자석(2)이 각각 배치되어 있다. 각 영구자석(2)에는 중앙홈(5)이 1개이고, 양측홈(6)이 2개 배치된다. 상기 중앙홈(5)과 양측홈(6)의 형상은은 회전자(1)의 길이방향으로 길게 형성되는 것이 특징이다. 2 shows the structure of the rotor 1 which produced the groove which is the core of the present invention. Inside the rotor 1, a plurality of permanent magnets (2) are formed, the rotor shaft (3) is formed in the center of the rotor (1). In the embodiment of the present invention, three pairs of permanent magnets 2 are symmetrically arranged, and a total of six permanent magnets 2 are arranged in the circumference. Each permanent magnet 2 has one central groove 5, and two grooves 6 are disposed. The shape of the center groove 5 and both side groove 6 is characterized in that it is formed long in the longitudinal direction of the rotor (1).

본 발명의 목적을 구현하기 위하여 회전자(1)의 내부에 영구자석(2)에 의하여 형성되는 자극(磁極)의 중앙 부분에 일정한 폭을 가지는 중앙홈(5)이 다수개 형성되고, 상기 각각의 중앙홈(5)의 양측에는 대칭되게 일정한 각도를 가지고 형성되는 두 개의 양측홈(6)이 형성되는 것이 특징이다. In order to realize the object of the present invention, a plurality of central grooves 5 having a predetermined width are formed in the central portion of the magnetic poles formed by the permanent magnets 2 in the rotor 1, respectively. Both sides of the central groove 5 is characterized in that the two two side grooves 6 are formed to have a symmetrically constant angle.

따라서, 본 발명의 실시예에서는 마그네트에 의해 형성되는 자극이 6개이므로 중앙홈(5)이 6개이고, 양측홈(6)은 총 12개가 형성된다. Therefore, in the embodiment of the present invention, since six magnetic poles are formed by the magnet, the central groove 5 is six, and both grooves 6 are formed in total of twelve.

본 발명의 실시예에서 중앙홈과 양측홈간의 사이각(∂)은 기계각으로 15°이고, 전기각으로는 45°를 형성하고 있다. 바람직하게 중앙홈과 양측홈간의 사이각(∂)은 전기각으로 35° 내지 55°이다. 여기서 가장 바람직한 사이각(∂)은 전기각으로 45°이다. In the embodiment of the present invention, the angle ∂ between the central groove and both grooves is 15 ° in the mechanical angle, and 45 ° in the electrical angle. Preferably, the angle ∂ between the central groove and both grooves is 35 ° to 55 ° in terms of electric angle. The most preferred angle between them is the electrical angle of 45 °.

도 3은 측정된 코깅 토크의 비교치를 나타내는 그래프이다. 3 is a graph showing a comparison of measured cogging torques.

상기 도 3의 그래프에서 영구자석(2)에 의하여 형성되는 자극의 중앙부분에 생성되는 중앙홈(5)은 3차 고조파 성분을 감소시키기 위한 것이고, 이를 중심으로 양측에 배치된 양측홈(6)은 6차 고조파 성분을 감소시키기 위한 홈이다. 이러한 두 종류의 회전자를 가지고 측정된 코깅 토크의 비교치를 도 3에 나타내고 있다.In the graph of FIG. 3, the central groove 5 formed in the central portion of the magnetic pole formed by the permanent magnet 2 is to reduce the third harmonic component, and both grooves 6 disposed on both sides of the central groove 5 are reduced. Is a groove for reducing the sixth harmonic component. A comparison of the cogging torques measured with these two types of rotors is shown in FIG. 3.

종래기술의 코킹 토크의 진폭은 A 와 D 의 진폭을 나타낸다. 본 발명에 의한 코깅토크는 B 와 C 사이의 진폭을 갖는다. The amplitude of the caulking torque of the prior art represents the amplitudes of A and D. The cogging torque according to the present invention has an amplitude between B and C.

이와 같이, 본 발명의 실시예에서는 약 75%정도의 코깅토그가 감소되는 결과를 얻었다. As described above, in the embodiment of the present invention, the cogging torque of about 75% was reduced.

코깅 토크는 1~4 RPM으로 구동 시켜 검출되는 토크의 양을 토크 미터로 측정을 하여 나타내는데 보통 코깅 토크의 정도를 최고점과 최저점의 차이로써 나타내게 된다. 본 발명은 이러한 코깅 토크의 고조파 성분을 줄이는데 중점을 두고 있으며, 회전자 외경에 홈을 생성 시켜, 3차 및 6차 고조파 성분을 현저히 감소시키는 것을 핵심으로 한다.The cogging torque is driven by 1 ~ 4 RPM and the amount of detected torque is measured by a torque meter. The cogging torque is usually expressed as the difference between the highest point and the lowest point. The present invention focuses on reducing the harmonic components of the cogging torque, and the core is to create a groove in the outer diameter of the rotor to significantly reduce the third and sixth harmonic components.

이상에서 상술한 바와 같이 본 발명에 의하면, 회전자 외측에 홈을 생성함으로써 전동기에서 발생하는 코깅 토크의 양을 크게 감소시킬 수 있다.As described above, according to the present invention, the amount of cogging torque generated in the electric motor can be greatly reduced by creating a groove outside the rotor.

또, 본 발명은 홈을 생성하는 것 외에 다른 모든 공정 및 부품이 똑같기 때문에 제작 및 생산에 매우 적합한 방법이며, 기존에 연구 및 공개되었던 방법들보다 우수한 코깅 토크 감소정도를 가지고 있다.In addition, the present invention is a very suitable method for manufacturing and production because all other processes and parts are the same except for creating a groove, and has an excellent degree of cogging torque reduction compared to the methods previously studied and disclosed.

Claims (4)

전동기의 회전자 구조에 있어서, In the rotor structure of the electric motor, 회전자(1)에 장착되는 영구자석(2)에 의하여 형성되는 자극의 중앙 부분에 일정한 폭을 가지는 다수개의 중앙홈(5)과, 상기 중앙홈(5)을 중심으로 양측에 대칭되게 일정한 각도를 가지고 형성되는 두 개의 양측홈(6)이 결합되는 것을 특징으로 하는 매입형 영구자석 전동기의 회전자 구조.A plurality of central grooves 5 having a predetermined width in the central portion of the magnetic pole formed by the permanent magnet (2) mounted to the rotor (1), and a constant angle symmetrically on both sides about the central groove (5) Rotor structure of the embedded permanent magnet electric motor, characterized in that the two grooves (6) are formed having two. 제1항에 있어서, 상기 중앙홈(5)과 양측홈(6)간의 사이각(∂)은 전기각으로 35° 내지 55°인 것을 특징으로 하는 매입형 영구자석 전동기의 회전자 구조. 2. The rotor structure according to claim 1, wherein an angle ∂ between the central groove 5 and both grooves 6 is 35 ° to 55 ° in terms of electric angle. 제1항에 있어서, 상기 중앙홈(5)은 영구자석에 의해 형성되는 자극의 수와 일치하고, 상기 양측홈(6)은 중앙홈에 2배수가 형성되는 것을 특징으로 하는 매입형 영구자석 전동기의 회전자 구조.2. The embedded permanent magnet electric motor according to claim 1, wherein the center groove (5) matches the number of magnetic poles formed by the permanent magnets, and the grooves on both sides (6) are doubled in the center grooves. Rotor structure. 제1항에 있어서, 상기 중앙홈(5)과 양측홈(6)은 회전자(1)의 길이방향으로 길게 형성되는 것을 특징으로 하는 매입형 영구자석 전동기의 회전자 구조. 2. The rotor structure according to claim 1, wherein the center groove (5) and both side grooves (6) are formed long in the longitudinal direction of the rotor (1).
KR1020070070656A 2007-07-13 2007-07-13 Rotor of embedded permanent magnet motor KR100908126B1 (en)

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US9490734B2 (en) 2011-04-19 2016-11-08 Electronics & Telecommunications Research Institute Motor control device and method of controlling the same

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