Dual-Mode Operation of DC-Excited Memory Motors Under Flux Regulation

The concept of memory is due to the fact that the magnetization level of permanent magnets (PMs) in the motor can be easily regulated by a temporary dc current pulse and then be memorized automatically. By incorporating this concept into the hybrid-field doubly salient PM (DSPM) motor, the resulting dc-excited memory motor can offer effective and efficient air-gap flux control. The purpose of this paper is to newly propose and implement dual-mode operation for the dc-excited memory motor. Namely, by regulating the magnetization level of the PMs, the motor can operate either under the DSPM mode or under the switched reluctance mode while maintaining similar operating performances. Both simulation and experimentation are used to verify the validity of the proposed dual-mode operation.