REDUCTION TECHNIQUE FOR PERMANENT MAGNET MOTOR HIGH FREQUENCY LOSS

摘要

A system (101) including a motor loss reducing controller system (101) utilizing input band-shifting, an integral control architecture and inverse band-shifting is disclosed. The motor loss reducing controller system (101) may provide correction of harmonic currents flowing to a PM motor from a motor controller (101). The compensation is added to the PWM voltage command signals. Within a compensator, d-axis and q-axis current feedback signals (75) are frequency shifted down by n times the fundamental frequency. This converts the initial motor stationary harmonic currents into DC values. The frequency shifting is completed by multiplying the feedback signal (75) by sine and cosine carrier signals of the shifted frequency. An integral controller (200) may cancel any component of error at a desired DC value. An inverse frequency-shift transformation is applied to the output of the I controller in order to shift the command output signal back to the original reference frame.