Synchronous disturbance suppression in a variable speed motor drive

摘要

A variable speed drive (20) for an electric motor (32) has an inverter (30) for receiving pulse width modulation controls. The inverter communicates power signals to a poly-phase electrical motor (32). A resolver (36) communicates signals from the poly-phase motor back to a motor control. The motor control includes a speed control (142), a field-oriented control (144), and a pulse width modulation drive (46) for driving the inverter. The resolver is connected to the speed control and to the field-oriented control, and further communicates with a synchronous compensator (76). The synchronous compensator is configured to drive the harmonic content at a target frequency or frequencies in a selected signal towards zero over time.