Reduction technique for permanent magnet motor high frequency loss

摘要

A system including a motor loss reducing controller system utilizing input band-shifting, an integral control architecture and inverse band-shifting is disclosed. The motor loss reducing controller system may provide correction of harmonic currents flowing to a PM motor from a motor controller. The compensation is added to the PWM voltage command signals. Within a compensator, d-axis and q-axis current feedback signals 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 by sine and cosine carrier signals of the shifted frequency. An integral controller 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.

主权项

1. A system comprising:
a motor loss controller structure configured for motor loss reduction, comprising an input bandshifting stage, an integral controller stage, and an output inverse bandshifting stage; wherein inputs to the system are a feedback signal, a motor frequency signal and a control value, wherein the sine of an angular component of a multiple of the motor frequency signal is multiplied by the feedback signal in the input bandshifting stage to form a first band-shifted feedback signal, wherein the cosine of the angular component of a multiple of the motor frequency signal is multiplied by the feedback signal in the input bandshifting stage to form a second band-shifted feedback signal, wherein errors in the first band-shifted feedback signal and the second band-shifted feedback signal are cancelled via integral control in the integral controller stage, wherein an inverse frequency-shift transformation is applied to an output of the integral controller stage in the output inverse bandshifting stage, and wherein a phase lead compensation is introduced at the multiple of the motor frequency signal.