IPMSM 센서리스 제어에서의 속도리플저감 알고리즘에 관한 연구

Abstract

An interior permanent magnet synchronous motor (IPMSM) has many advantages such as high efficiency, high power density, mechanical robustness of rotor construction and wide flux-weakening range and so on. Therefore it is widely used for compressors, spindles and electric vehicles in industries. In case of compressors, a torque pulsation happens during suction and discharge processes and it consequently produces fatigue failure, noise in a pipe and speed ripple which leads a control system to unstable. This paper presents a harmonic-pulsation-compensator to reduce the speed ripple and the compensator algorithm is consisted with a phasor detector, a PI compensator and a vector rotation. To design the phasor detector, coefficients of speed ripple are obtained from literature surveys. The PI compensator is designed by simulations and experiments. In order to reduce the speed ripple, the vector rotation is introduced by considering a vector relationship between the torque and the speed ripple. The compensator results are approved by simulations and experiments. The harmonic compensator can not only improve speed ripple reduction time more than 20% but reduces the ripple amplitude more than 3.4 times compared with conventional compensators by using PI compensation and vector rotation respectably. The harmonic compensator involving PI compensation can reduce the speed ripple 20% faster than conventional integrated compensators. The harmonic compensator can reduce speed ripple more than 3.4 times by using the vector rotation.