| 摘要 |
A digital calculation apparatus 4 including a position-detection means 14 for detecting the magnetic pole position, based on the detected current difference values of the synchronous motor 1 in a two-phase short-circuit state, takes in current flowing in the synchronous motor by generating an interruption trigger signal in synchronization with the PWM signals for driving an inverter 3, and driving an A/D converter with the generated trigger signal.
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