옵셋 전압을 이용한 단상 영구자석 동기 전동기의초기 회전자 위치 검출
Initial Rotor Position Detection of Single-phase Permanent Magnet Synchronous Motor using Offset Voltage
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초록
본 논문에서는 비대칭 공극을 갖는 단상 영구자석 동기 전동기의 센서리스 운전을 위한 초기 회전자 위치 검출 알고리즘을 제안한다. 일반적인 센서리스 운전 기법 중 역기전력 기반의 센서리스 제어는 영속 및 저속운전에서 역기전력 정보를 추정하기 어렵다. 이를 위해 오픈 루프 기동 기법이 필수적으로 요구되고 일정한 방향으로의 회전을 위해서는 회전자의 초기위치 검출이 반드시 필요하다. 본 논문에서는 단상 영구자석 동기 전동기의 자기적 특성을 이용하여 고주파 전압 주입 신호에 옵셋 전압을 추가하여 회전자 자극을 검출하는 기법을 제안한다. 다수의 실험 결과를 통하여 제안된 알고리즘의 유효성과유용성을 검증하였다.
Abstract
This paper propose an initial rotor position detection method for sensorless operation of a single-phase permanentmagnet synchronous motor(SP-PMSM) with asymmetric air-gap. In general, the sensorless control based on back-emfestimation is difficult to estimate the back-emf at the zero and low speed regions. For this reason, an open loop start-uptechnique is indispensable, and it is also necessary to detect the initial position of the rotor in order to rotate in a certaindirection. In this paper, we propose a method to detect rotor polarity by adding offset voltage to high frequency voltagesignal based on the magnetic characteristics of SP-PMSM. The validity and usefulness of the proposed algorithm areverified through several experimental results.
참고문헌 (9)
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