| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for controlling a surge voltage generated from the load end of a voltage-type inverter in the inverter for performing a pulse width modulation calculation of a command value to set an output voltage to a predetermined value. <P>SOLUTION: When a pulse width of a collapsed pulse of the output voltage is narrowed near the peak value of a phase voltage by a carrier oscillator 16a of the voltage-type inverter 2, voltage pattern generating means 21-23, a U-phase PWM control block 24, a V-phase PWM control block 25 and a W-phase PWM control block 26, this pulse width is limited so as to become wider; and further in order to set a change of the output voltage, even in the limited pulse width to the same as a prior art, an operation for turning on during one period of the PWM calculation at an upper arm or a lower arm of the corresponding phase is used in combination. <P>COPYRIGHT: (C)2004,JPO |
