| 摘要 |
When a CPU calculates, based on a frequency command value for driving an electric motor and a state amount of the electric motor, an output voltage command at calculation intervals of a predetermined time period, it calculates a plurality of output voltage command values, in which the amplitudes are the same but only the phases advance, at those calculation intervals under a given condition without shortening the calculation intervals. An ASIC reflects the plurality of output voltage command values received form the CPU onto triangular wave signals in the order of time sequence for comparison to output a PWM signal to a switching circuit. As a result, an inverter apparatus can be obtained which can cause the waveform of the output voltage to be closer to a sinusoidal wave than in the conventional art and which can reduce the processing load of the CPU, regardless of the value of the output frequency.
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