Title :
Effects and compensation of magnetic saturation in permanent magnet synchronous motor drives
Author :
Morimoto, Shigeo ; Ueno, Tomohiro ; Sanada, Masayuki ; Yamagiwa, Akio ; Takeda, Yoji ; Hirasa, Takao
Author_Institution :
Univ. of Osaka Prefecture, Sakai, Japan
Abstract :
The effects of magnetic saturation are examined, and the compensation of magnetic saturation is proposed for the PM (permanent magnet) motor drives. A speed control system is established based on a DSP, and drive tests were carried out on a prototype IPM (interior permanent magnet) motor. The q-axis inductance of a IPM motor is found to vary depending on the q-axis current because of the magnetic saturation. The terminal voltage exceeds the maximum value in the flux-weakening region and, as a result, the transient responses sometimes become unstable because of saturation of the current regulator. The q-axis inductance is simply modeled as a function of the q-axis current and this compensated value of Lq is used in the control algorithm. The control performances are greatly improved by the compensation of magnetic saturation
Keywords :
digital control; digital signal processing chips; electric drives; machine control; machine testing; machine theory; permanent magnet motors; synchronous motors; transient response; velocity control; DSP; compensation; control algorithm; current regulator; digital control; flux-weakening region; interior permanent magnet; machine testing; magnetic saturation; performances; permanent magnet synchronous motor drives; q-axis current; q-axis inductance; speed control; stability; terminal voltage; transient responses; Digital signal processing; Inductance; Induction motors; Motor drives; Permanent magnet motors; Permanent magnets; Prototypes; Saturation magnetization; System testing; Velocity control;
Conference_Titel :
Industry Applications Society Annual Meeting, 1993., Conference Record of the 1993 IEEE
Conference_Location :
Toronto, Ont.
Print_ISBN :
0-7803-1462-X
DOI :
10.1109/IAS.1993.298904
