| 摘要 |
The invention includes: a random number generating unit which outputs a random number in driving of an AC motor by a voltage source inverter, a maximum/minimum triangular wave frequency setting unit which calculates a maximum triangular wave frequency and minimum triangular wave frequency using the inverter frequency, a triangular wave frequency calculating unit which calculates a triangular wave frequency from the random number, the maximum/minimum triangular wave frequency, and a triangular wave peak pulse, a triangular wave generating unit which calculates a triangular wave in accordance with this triangular wave frequency and outputs a triangular wave peak pulse, a voltage reference generating unit which inputs inverter current references and the motor revolution frequency, and which calculates the inverter frequency and voltage references of each phase of the inverter, and a PWM pulse generating unit which inputs the voltage references and triangular wave of each phase which are calculated and outputs a PWM pulse pattern for each phase, in accordance with the principles of pulse width modulation.
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