KR20060064301A - Synchronous motor - Google Patents

Synchronous motor Download PDF

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KR20060064301A
KR20060064301A KR1020040103107A KR20040103107A KR20060064301A KR 20060064301 A KR20060064301 A KR 20060064301A KR 1020040103107 A KR1020040103107 A KR 1020040103107A KR 20040103107 A KR20040103107 A KR 20040103107A KR 20060064301 A KR20060064301 A KR 20060064301A
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South Korea
Prior art keywords
permanent magnet
permanent magnets
synchronous motor
permanent
rotor core
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KR1020040103107A
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Korean (ko)
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KR100668974B1 (en
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홍숙현
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삼성전자주식회사
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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
    • 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
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/02—Details
    • H02K21/021—Means for mechanical adjustment of the excitation flux
    • H02K21/022—Means for mechanical adjustment of the excitation flux by modifying the relative position between field and armature, e.g. between rotor and stator
    • H02K21/025—Means for mechanical adjustment of the excitation flux by modifying the relative position between field and armature, e.g. between rotor and stator by varying the thickness of the air gap between field and armature
    • H02K21/026—Axial air gap machines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/48—Fastening of windings on the stator or rotor structure in slots

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)

Abstract

본 발명은 회전자 구조를 개선한 동기모터에 관한 것으로서, 고정자(10)와; 고정자(10)의 내측에 마련되는 회전자코어(30)와; 회전자코어(30)의 중심축에 대해 상하좌우로 대칭되게 매립되는 복수의 영구자석(40)을 가지며, 복수의 영구자석(40) 각각은 양측부에 배치되는 제1,2영구자석(42,44)과; 제1,2영구자석(42,44) 사이에 배치되는 제3영구자석(46)을 포함하는 것을 특징으로 한다. 이에 따라, 동기모터의 코깅토크를 줄임으로써 토크리플을 상대적으로 저감시킬 수 있다.The present invention relates to a synchronous motor having an improved rotor structure, comprising: a stator 10; A rotor core 30 provided inside the stator 10; It has a plurality of permanent magnets (40) embedded symmetrically up, down, left and right with respect to the central axis of the rotor core (30), each of the plurality of permanent magnets 40, the first and second permanent magnets 42 are disposed on both sides 44); And a third permanent magnet 46 disposed between the first and second permanent magnets 42 and 44. Accordingly, torque ripple can be relatively reduced by reducing cogging torque of the synchronous motor.

고정자, 회전자, 회전자코어, 영구자석, 코깅토크, 토크리플Stator, rotor, rotor core, permanent magnet, cogging torque, torque ripple

Description

동기모터 {SYNCHRONOUS MOTOR}Synchronous Motor {SYNCHRONOUS MOTOR}

도 1은 본 발명의 제1실시예에 따른 동기모터 구조를 도시한 횡단면도이고,1 is a cross-sectional view showing a synchronous motor structure according to a first embodiment of the present invention,

도 2는 본 발명의 제1실시예에 따른 동기모터 구조를 도시한 종단면도이고,2 is a longitudinal sectional view showing a synchronous motor structure according to a first embodiment of the present invention;

도 3은 본 발명의 제2실시예에 따른 동기모터 구조를 도시한 횡단면도이고,3 is a cross-sectional view showing a synchronous motor structure according to a second embodiment of the present invention,

도 4는 본 발명의 제3실시예에 따른 동기모터 구조를 도시한 횡단면도이고,4 is a cross-sectional view showing a synchronous motor structure according to a third embodiment of the present invention;

도 5는 본 발명의 제4실시예에 따른 동기모터 구조를 도시한 횡단면도이다.5 is a cross-sectional view showing a synchronous motor structure according to a fourth embodiment of the present invention.

< 도면의 주요 부분에 대한 부호의 설명 >            <Description of Symbols for Main Parts of Drawings>

10 : 고정자 12 : 슬롯           10: stator 12: slot

20 : 회전자 30 : 회전자코어           20: rotor 30: rotor core

32a : 제1자석매립홀 32b : 제2자석매립홀           32a: First magnet buried hole 32b: Second magnet buried hole

32c : 제3자석매립홀 34 : 자속누설방지홀           32c: third magnet buried hole 34: magnetic flux leakage prevention hole

40 : 영구자석 42 : 제1영구자석           40: permanent magnet 42: the first permanent magnet

44 : 제2영구자석 46 : 제3영구자석           44: second permanent magnet 46: third permanent magnet

본 발명은 동기모터에 관한 것으로서, 보다 상세하게는 회전자 구조를 개선 한 동기모터에 관한 것이다.The present invention relates to a synchronous motor, and more particularly to a synchronous motor with improved rotor structure.

일반적으로, 냉장고 또는 공기조화기 등과 같이 냉동사이클에 의해 작동되는 기기는 냉매를 압축하는 압축기가 필수적으로 구비되고, 이러한 압축기는 대부분 모터와 같은 동력수단에 의해 구동된다. In general, a device operated by a refrigerating cycle, such as a refrigerator or an air conditioner, is essentially provided with a compressor for compressing a refrigerant, and most of these compressors are driven by a power means such as a motor.

압축기에 주로 사용되는 모터로는 직류모터, 교류모터 또는 브러시리스모터 등이 있다.The motor mainly used in the compressor includes a DC motor, an AC motor or a brushless motor.

특히, 교류모터의 일종인 동기모터(synchronous motor)는 입력주파수에 동기되어 안정적인 회전특성을 얻을 수 있을 뿐 아니라 전원주파수를 가변하는 것으로 모터의 회전수를 자유롭게 변화시킬 수 있는 장점이 있어, 최근에 들어 그 사용이 증가하고 있다.In particular, a synchronous motor, which is a kind of AC motor, has the advantage of being able to freely change the rotational speed of the motor by varying the power frequency as well as obtaining stable rotational characteristics in synchronization with the input frequency. For its use is increasing.

종래의 동기모터는 고정자와; 고정자의 내측에 마련되며, 중심축에 대해 상하좌우로 대칭되도록 복수의 영구자석이 매립되어 있는 회전자를 포함하여 구성된다. 특히, 원통형 구조를 가진 회전자는 고정자와 영구자석의 상호작용에 의해 회전되는 구조를 지니고 있으며, 영구자석의 양측에는 자속누설을 방지하기 위한 자속누설방지홀이 형성되어 있다.Conventional synchronous motors include a stator; It is provided on the inside of the stator, and comprises a rotor in which a plurality of permanent magnets are embedded so as to be symmetrical with respect to the central axis. In particular, the rotor having a cylindrical structure has a structure that is rotated by the interaction of the stator and the permanent magnet, the magnetic flux leakage prevention hole is formed on both sides of the permanent magnet to prevent magnetic flux leakage.

상기와 같은 구조의 동기모터는 영구자석의 배치구조 및 형상변화에 의해 공극자속밀도의 파형이 달라지기 때문에 영구자석이 직선 형태를 가질 경우에는 고정자 코일로 야기되는 역기전압의 값이 작게 발생하여 토크 특성이 저하되는 결과를 초래한다. In the synchronous motor of the above structure, since the waveform of the pore magnetic flux density varies according to the arrangement structure and shape change of the permanent magnet, when the permanent magnet has a straight shape, the value of the counter electromotive voltage caused by the stator coil is small and the torque is generated. This results in deterioration of properties.

또한, 영구자석의 형상에 따라 발생되는 코깅토크도 달라지기 때문에 동기모 터의 토크리플에 영향을 미칠 뿐 아니라 작동시 소음 및 진동도 커질 수 있는 문제점이 있다.In addition, since the cogging torque is also generated according to the shape of the permanent magnet, there is a problem that not only affect the torque ripple of the synchronous motor, but also increase the noise and vibration during operation.

본 발명은 상기와 같은 문제점을 해결하기 위하여 창출된 것으로, 코깅토크를 줄임으로써 토크리플을 상대적으로 저감시킬 수 있는 동기모터를 제공하고자 하는 데 그 목적이 있다.The present invention was created to solve the above problems, and an object thereof is to provide a synchronous motor that can relatively reduce torque ripple by reducing cogging torque.

상기와 같은 목적을 달성하기 위하여 본 발명은, 고정자와; 상기 고정자의 내측에 마련되는 회전자코어와; 상기 회전자코어의 중심축에 대하여 상하좌우로 대칭되게 매립되는 복수의 영구자석을 갖는 동기모터에 있어서, 상기 복수의 영구자석 각각은, 양측부에 배치되는 제1,2영구자석과; 상기 제1영구자석 및 제2영구자석 사이에 배치되는 제3영구자석을 포함하여 구성되는 데 그 특징이 있다.The present invention to achieve the above object, the stator; A rotor core provided inside the stator; A synchronous motor having a plurality of permanent magnets symmetrically embedded vertically, left, and right with respect to a central axis of the rotor core, wherein each of the plurality of permanent magnets comprises: first and second permanent magnets disposed at both sides; It is characterized in that it comprises a third permanent magnet disposed between the first permanent magnet and the second permanent magnet.

상기 제1영구자석 및 제2영구자석은 동일선상에 배치되고, 상기 제3영구자석은 상기 회전자코어의 중심축 방향으로 돌출되도록 배치되는 것이 바람직하다.Preferably, the first permanent magnet and the second permanent magnet are arranged on the same line, and the third permanent magnet is disposed to protrude in the direction of the central axis of the rotor core.

상기 제1영구자석 및 제2영구자석은 동일선상에 배치되고, 상기 제3영구자석은 상기 회전자코어의 외주면 방향으로 돌출되도록 배치되는 것이 바람직하다.Preferably, the first permanent magnet and the second permanent magnet are arranged on the same line, and the third permanent magnet is disposed to protrude in the direction of the outer circumferential surface of the rotor core.

상기 제1,2영구자석은 길이가 동일하고, 상기 제3영구자석은 상기 제1,2영구자석보다 길이가 긴 것이 바람직하다.Preferably, the first and second permanent magnets have the same length, and the third permanent magnet is longer than the first and second permanent magnets.

상기 제1,2영구자석은 두께가 동일하고, 상기 제3영구자석은 상기 제1,2영구자석보다 두께가 두꺼운 것이 바람직하다.Preferably, the first and second permanent magnets have the same thickness, and the third permanent magnet is thicker than the first and second permanent magnets.

이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

도 1 및 도 3에 도시된 바와 같이, 본 발명에 따른 동기모터는 코일(미도시)이 권선되는 고정자(10)와; 고정자(10)에 대해 회전 가능하게 설치되는 회전자(20)를 포함하여 구성된다.As shown in Figures 1 and 3, the synchronous motor according to the present invention and the stator 10 is wound with a coil (not shown); It comprises a rotor 20 rotatably installed relative to the stator 10.

고정자(10)에는 원주방향으로 교대로 배치되는 다수의 슬롯(12) 및 티스(14)가 마련되어 있다.The stator 10 is provided with a plurality of slots 12 and teeth 14 arranged alternately in the circumferential direction.

회전자(20)는 고정자(10)의 내측에 마련되며, 중심축에 대해 상하좌우로 대칭되는 복수의 자석매립홀(32)이 형성되어 있는 회전자코어(30)와; 복수의 자석매립홀(32) 각각에 매립되는 영구자석(40)을 포함한다. 회전자코어(30)의 양측면에는 영구자석(40)이 자석매립홀(32)을 통해 이탈되는 것을 방지하는 커버플레이트(50)가 결합되어 있다.The rotor 20 is provided inside the stator 10 and includes a rotor core 30 in which a plurality of magnet buried holes 32 are symmetrically arranged up, down, left and right with respect to a central axis; It includes a permanent magnet 40 embedded in each of the plurality of magnet buried holes (32). Both sides of the rotor core 30 is coupled to the cover plate 50 to prevent the permanent magnet 40 is separated through the magnet buried hole (32).

회전자코어(30)는 소정의 직경을 갖는 다수의 원형 강판이 코킹결합에 의해 적층된 원통형 구조를 가진다. 회전자코어(30)에 형성되어 있는 복수의 자석매립홀(32) 각각의 양측부에는 제1자석매립홀(32a) 및 제2자석매립홀(32b)이 형성되고, 제1자석매립홀(32a) 및 제2자석매립홀(32b) 사이에는 제3자석매립홀(32c)이 각각 형성되어 있다.The rotor core 30 has a cylindrical structure in which a plurality of circular steel sheets having a predetermined diameter are laminated by caulking coupling. First magnet buried holes 32a and second magnet buried holes 32b are formed at both sides of each of the plurality of magnet buried holes 32 formed in the rotor core 30, and the first magnetic buried holes ( A third magnet buried hole 32c is formed between 32a) and the second magnet buried hole 32b, respectively.

복수의 영구자석(40) 각각은 제1자석매립홀(32a) 및 제2자석매립홀(32b)에 매립되어, 양측부에 배치되는 제1영구자석(42) 및 제2영구자석(44)과; 제3자석매립홀(32c)에 매립되어, 제1영구자석(42) 및 제2영구자석(44) 사이에 배치되는 제3영 구자석(46)을 포함한다. Each of the plurality of permanent magnets 40 is embedded in the first magnet buried hole 32a and the second magnet buried hole 32b, and the first and second permanent magnets 42 and 44 are disposed at both sides. and; A third permanent magnet 46 is embedded in the third magnet buried hole 32c and disposed between the first permanent magnet 42 and the second permanent magnet 44.

제1,2영구자석(42,44)의 길이는 동일하고, 제3영구자석(46)은 제1,2영구자석(42,44)보다 길이가 길게 형성되는 것이 바람직하다.The first and second permanent magnets 42 and 44 have the same length, and the third permanent magnet 46 is preferably formed to have a longer length than the first and second permanent magnets 42 and 44.

제1영구자석(42) 및 제2영구자석(44)은 동일선상에 배치됨과 아울러 제3영구자석(46)은 회전자코어(30)의 중심축 방향으로 돌출되도록 배치됨으로써 토크 특성을 향상시킬 수 있다. 도 1은 제3영구자석(46)이 완전히 돌출 배치된 상태를 도시한 것이며, 도 3은 제3영구자석(46)이 부분적으로 돌출 배치된 상태를 도시한 것이다. The first permanent magnet 42 and the second permanent magnet 44 are arranged on the same line and the third permanent magnet 46 is arranged to protrude in the direction of the center axis of the rotor core 30 to improve torque characteristics. Can be. FIG. 1 illustrates a state in which the third permanent magnet 46 is completely protruded, and FIG. 3 illustrates a state in which the third permanent magnet 46 is partially protruded.

제1,2,3영구자석(42,44,46)은 직사각 형태를 가지기 때문에 형상변화에 따른 가공비를 상대적으로 절약할 수 있으며, 제1,2,3영구자석(42,44,46)의 형상은 필요에 따라 다양하게 변경 가능하다. 그리고 방사방향으로 착자된 제1,2,3영구자석(42,44,46)은 자화방향으로 나란히 삽입된다.Since the first, second, and third permanent magnets 42, 44, and 46 have a rectangular shape, processing costs due to the shape change can be relatively reduced, and the first, second, and third permanent magnets 42, 44, and 46 can be The shape can be variously changed as necessary. The first, second and third permanent magnets 42, 44 and 46 magnetized in the radial direction are inserted side by side in the magnetization direction.

자석매립홀(32) 각각의 양측 단부에는 제1,2영구자석(42,44)의 끝단에서 발생되는 자속누설을 방지하여 자속이 고정자(10)로 흐르게 유도하는 자속누설방지홀(34)이 형성되어 있으며, 필요에 따라 제3영구자석(46)의 양측 단부에도 자속누설방지홀을 형성할 수 있다. 자속누설방지홀(34)은 자속누설방지 효율을 상대적으로 높일 수 있도록 제1,2자석매립홀(32a,32b)과 일체로 형성되는 것이 바람직하다.At both ends of each of the magnet buried holes 32, magnetic flux leakage preventing holes 34 which prevent magnetic flux leakage occurring at the ends of the first and second permanent magnets 42 and 44 to induce magnetic flux to flow into the stator 10 are provided. The magnetic flux leakage prevention hole may be formed at both ends of the third permanent magnet 46 as necessary. The magnetic flux leakage preventing hole 34 is preferably formed integrally with the first and second magnet buried holes 32a and 32b to relatively increase the magnetic flux leakage preventing efficiency.

도 4는 영구자석(40)의 배치구조를 달리한 것으로, 제1영구자석(42) 및 제2영구자석(44)은 동일선상에 배치됨과 아울러 제3영구자석(46)은 회전자코어(30)의 외주면 방향으로 돌출되도록 배치되어 있다. 이도 역시, 제1,2영구자석(42,44)은 길이가 동일하고, 제3영구자석(46)은 제1,2영구자석(42,44)보다 길이가 길게 형성된다.4 is a different arrangement structure of the permanent magnet 40, the first permanent magnet 42 and the second permanent magnet 44 is arranged on the same line and the third permanent magnet 46 is a rotor core ( It is arrange | positioned so that it may protrude in the outer peripheral surface direction of (30). Again, the first and second permanent magnets 42 and 44 have the same length, and the third permanent magnet 46 has a longer length than the first and second permanent magnets 42 and 44.

그리고 도 5는 영구자석(40)의 두께를 상이하게 형성한 것으로, 제1,2영구자석(42,44)은 두께가 동일하고, 제3영구자석(46)은 제1,2영구자석(42,44)보다 두께가 두껍게 형성되는 것이 바람직하다. 제3영구자석(46)은 회전자코어(30)의 중심축 방향으로 돌출 배치되어 있으나, 회전자코어(30)의 외주면 방향으로 돌출 배치될 수도 있다.5 shows that the permanent magnets 40 have different thicknesses, the first and second permanent magnets 42 and 44 have the same thickness, and the third permanent magnet 46 has the first and second permanent magnets ( It is preferable to form thicker than 42,44). The third permanent magnet 46 is disposed to protrude in the direction of the center axis of the rotor core 30, but may be disposed to protrude in the direction of the outer circumferential surface of the rotor core 30.

이와 같이, 제1,2,3영구자석(42,44,46)의 크기 및 두께를 서로 다르게 형성함으로써 제3영구자석(46)이 매립되는 중앙영역의 자기저항을 키울 수 있을 뿐 아니라 공극자속밀도의 크기를 증가시킬 수도 있으므로 고정자(10) 코일에 야기되는 역기전압을 크게 할 수 있다.As such, by forming different sizes and thicknesses of the first, second, and third permanent magnets 42, 44, and 46, the magnetic resistance of the central region in which the third permanent magnets 46 are embedded can be increased, as well as the air gap magnetic flux. Since the magnitude of the density may be increased, the counter voltage caused by the stator 10 coil may be increased.

이상에서 설명한 동기모터의 작동상태를 간단히 살펴보면 하기와 같다.The operation state of the synchronous motor described above is briefly described as follows.

먼저, 회전자코어(30)에는 영구자석(40)이 매립되어 있으므로 일정의 자계가 형성된다.First, since the permanent magnet 40 is embedded in the rotor core 30, a predetermined magnetic field is formed.

이 상태에서 고정자(10)에 권선된 코일과 연결된 인버터에 전원이 인가되면, 인버터는 전류제어 또는 전압제어를 수행하여 고정자(10) 전류에 의한 회전자계가 생성된다.In this state, when power is applied to the inverter connected to the coil wound on the stator 10, the inverter performs current control or voltage control to generate a rotating magnetic field by the current of the stator 10.

고정자(10) 코일에 흐르는 전류가 인버터에 의해 회전주파수가 변하게 되면, 고정자(10)의 내측에 소정 간격의 공극을 두고 설치된 회전자코어(30)가 영구자석(40)에 의해 회전하게 된다. 이 때, 회전자코어(30)의 회전속도는 인버터의 스위칭 주파수를 변화시킴으로써 가변할 수 있다.When the current flowing in the stator 10 coil changes in rotation frequency by the inverter, the rotor core 30 installed at a predetermined interval inside the stator 10 is rotated by the permanent magnet 40. At this time, the rotation speed of the rotor core 30 can be varied by changing the switching frequency of the inverter.

이상에서 설명한 바와 같이 본 발명에 따르면, 영구자석의 형상 및 배치구조를 개선하여 동기모터의 코깅토크를 줄임으로써 토크리플을 상대적으로 저감시킬 수 있다.As described above, according to the present invention, torque ripple can be relatively reduced by reducing the cogging torque of the synchronous motor by improving the shape and arrangement of the permanent magnet.

또한, 중앙영역에 위치한 영구자석의 두께를 변형시켜 고정자 코일에 야기되는 역기전압을 크게 할 수 있다.In addition, by changing the thickness of the permanent magnet located in the central region it can increase the counter electromotive voltage caused to the stator coils.

Claims (5)

고정자와; 상기 고정자의 내측에 마련되는 회전자코어와; 상기 회전자코어의 중심축에 대하여 상하좌우로 대칭되게 매립되는 복수의 영구자석을 갖는 동기모터에 있어서,With a stator; A rotor core provided inside the stator; In the synchronous motor having a plurality of permanent magnets symmetrically embedded in the up, down, left and right with respect to the central axis of the rotor core, 상기 복수의 영구자석 각각은, 양측부에 배치되는 제1,2영구자석과; 상기 제1영구자석 및 제2영구자석 사이에 배치되는 제3영구자석을 포함하는 것을 특징으로 하는 동기모터.Each of the plurality of permanent magnets includes: first and second permanent magnets disposed at both sides; And a third permanent magnet disposed between the first permanent magnet and the second permanent magnet. 제1항에 있어서,The method of claim 1, 상기 제1영구자석 및 제2영구자석은 동일선상에 배치되고, 상기 제3영구자석은 상기 회전자코어의 중심축 방향으로 돌출되도록 배치되는 것을 특징으로 하는 동기모터.The first permanent magnet and the second permanent magnet is arranged on the same line, the third permanent magnet is characterized in that the synchronous motor is arranged to protrude in the direction of the center axis of the rotor core. 제1항에 있어서,The method of claim 1, 상기 제1영구자석 및 제2영구자석은 동일선상에 배치되고, 상기 제3영구자석은 상기 회전자코어의 외주면 방향으로 돌출되도록 배치되는 것을 특징으로 하는 동기모터.The first permanent magnet and the second permanent magnet is arranged on the same line, the third permanent magnet is characterized in that the synchronous motor is arranged to protrude in the direction of the outer peripheral surface of the rotor core. 제2항 또는 제3항에 있어서,The method according to claim 2 or 3, 상기 제1,2영구자석은 길이가 동일하고, 상기 제3영구자석은 상기 제1,2영구자석보다 길이가 긴 것을 특징으로 하는 동기모터.The first and second permanent magnets have the same length, and the third permanent magnet has a longer length than the first and second permanent magnets. 제4항에 있어서,The method of claim 4, wherein 상기 제1,2영구자석은 두께가 동일하고, 상기 제3영구자석은 상기 제1,2영구자석보다 두께가 두꺼운 것을 특징으로 하는 동기모터.The first and second permanent magnets have the same thickness, and the third permanent magnet is characterized in that the thicker than the first and second permanent magnets.
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