| 摘要 |
A detailed architectural and operational characteristic of a pulse code width modulation (PCWM) motor drive system is presented. The system can drive a three phase permanent magnet AC (PMAC) motor sinusoidally without sensing its rotor position. The system employs an ultrasonic carrier frequency (e.g., of approximately 20 kHz) to avoid annoying acoustic noise problems. While keeping the hardware construction at a minimum, it can provide the highest possible motor performance by satisfying various motor operating requirements. The system may includes an AC to DC converter, an application specific integrated circuit (ASIC), a DC to DC step-down chopper, and a gate drive and power transistor circuitry to drive a three phase AC motor.
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