Polyphase motor drive system with balanced modulation

摘要: Sinusoidal excitation currents are supplied to the three terminals of a "wye" or "delta" connected phase motor by an improved multiphase energizing drive system. For each terminal associated with different phase, individual feedback signal representing current flowing into that respective is sensed and subtracted from its corresponding controllable sine wave reference command produce error for terminal. The these preferably converted two-state means pulse width modulator. modulator outputs used control power semiconductor switches which connect either positive negative dc voltage. In preferred system, one terminals, loop omitted, driven inverted sum signals other two phases. result inherently balanced terminals.