목차

1. 서론 ··········································································· 1
1.1 연구 배경 ······························································· 1
1.2 연구의 목적 ···························································· 4
1.3 논문의 구성 ···························································· 5
2. 영구자석 동기 전동기의 모델링 및 동작 영역 ·························· 6
2.1 영구자석 동기 전동기의 종류와 모델링 ···························· 6
2.1.1 매입형 영구자석 동기 전동기 ································ 8
2.1.2 표면 부착형 영구자석 동기 전동기 ························· 17
2.2 영구자석 동기 전동기의 동작 영역 ·································· 22
2.2.1 전류 제한 조건 ·················································· 22
2.2.2 전압 제한 조건 ··················································· 23
2.2.3 단위 전류당 최대 토크 운전 ·································· 26
2.2.4 일정 출력 영역 운전 ··········································· 29
2.2.5 특성 영역 운전 ·················································· 32
3. 직접 토크 제어 ······························································ 36
3.1 스위칭 테이블을 이용한 직접 토크 제어기법 ····················· 37
3.2 RFVC(Reference Flux Vector Calculator) 기법··················· 42
3.2.1 전압 벡터 선정 방법 ··········································· 42
3.2.2 토크 제어기 ····················································· 45
3.3 DTFC(Direct Torque and Flux Control) ························· 48
3.3.1 제어기 설계 ····················································· 48
3.3.1.1 자속 제어기 설계 ····································· 52
3.3.1.2 토크 제어기 설계 ····································· 55
3.3.2 적분기 누적 억제기법(Anti-windup) ························ 58
3.4 회전자 초기 위치 추정 ················································· 62
3.4.1 구형파 주입을 이용한 회전자 위치 추정기법 ·············· 63
3.4.2 신호 처리기법 ··················································· 66
3.4.3 자극 판별방법 ··················································· 70
4. 직접 토크 제어시 동작 영역에 따른 운전기법 ························· 72
4.1 기존의 운전기법 ························································ 72
4.2 자속 평면에서 전압과 전류 제한 조건의 해석 ···················· 75
4.2.1 전류 제한 조건 ·················································· 75
4.2.2 전압 제한 조건 ·················································· 77
4.3 제안된 운전기법 ························································· 82
4.3.1 일정 토크 영역 운전 ··········································· 83
4.3.2 일정 출력 영역 운전 ··········································· 85
4.3.3 특성 영역 운전 ·················································· 88
4.4 파라미터 오차의 영향 ·················································· 91
4.4.1 고정자 저항에 의한 영향 ······································· 91
4.4.2 q축 인덕턴스 변화에 의한 영향 ······························· 94
5. 자속 추정기 ··································································· 96
5.1 확장 회전자 자속을 이용한 자속 추정기 ··························· 97
5.1.1 고정자 자속 및 토크 연산 ····································· 100
5.1.2 속도 추정 ························································· 100
5.2 인버터의 왜곡 전압 보상 ·············································· 101
6. 시뮬레이션 ···································································· 103
6.1 시뮬레이션 조건 ························································ 103
6.2 시뮬레이션 결과 ························································ 103
7. 실험 ············································································ 114
7.1 실험 장치의 구성 ······················································· 114
7.1.1 제어부와 전력 변환부 ·········································· 115
7.1.2 M-G(Motor-Generator) 세트 구성 ·························· 116
7.2 표면 부착형 영구자석 동기 전동기의 실험 결과 ·················· 117
7.3 매입형 영구자석 동기 전동기의 실험 결과 ························· 125
7.4 초기 위치 추정 실험 ··················································· 133
7.5 인버터 비선형성 보상 ·················································· 136
8. 결론 ············································································ 138