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

fYear

1993

fDate

2-8 Oct 1993

Firstpage

59

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 L_q 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;

fLanguage

English

Publisher

ieee

Conference_Titel

Industry Applications Society Annual Meeting, 1993., Conference Record of the 1993 IEEE

Conference_Location

Toronto, Ont.

Print_ISBN

0-7803-1462-X

Type

conf

DOI

10.1109/IAS.1993.298904

Filename

298904