| 摘要 |
PROBLEM TO BE SOLVED: To reduce the fluctuations of a torque, when performing switching between sinusoidal wave control and rectangular wave control. SOLUTION: The phase and amplitude of a sinusoidal wave a1, that is the voltage waveform of current PWM sinusoidal wave control, are obtained. Also, the phase of a rectangular wave c1 for generating a torque that is equivalent to a current motor torque is obtained. The rectangular wave c1 may be regarded as a sinusoidal wave with a calculated phase and a limitless amplitude. Therefore, the phase and amplitude are simultaneously and continuously changed from a sinusoidal wave a1 into a rectangular wave c1. A PWM processing is performed to a sinusoidal wave signal with the phase and amplitude that are changing to generate the control signal of an inverter, thus obtaining a voltage waveform b1 with the middle phase and amplitude between moments before and after switching. A motor torque corresponding to the voltage waveform b1 is equal to or close to the motor torques before and after the switching. |
