| 摘要 |
<p>A basic wave current detection unit (8) detects the current in a zero-voltage vector period (V7 or V0) for PWM control. A current change-amount detection unit (11) calculates the current difference for an actual current corresponding to a current differential, from a current detection value. A current difference component calculation unit (12) calculates electromotive force from the current detection value, the amount of voltage drop due to motor resistance (R), inductance (L), and an angular frequency command (?*), and converts same to a current difference component arising from the voltage component thereof, using the inductance (L) and the time difference (?Tp) for the current difference. Correction angular frequency command calculation units (13-15) calculate a correction angular frequency (??p *) by adding the current difference for the actual current and the current difference component, multiplying the filter and the correction gain, and multiplying an angular frequency weighting function (K?) approximating the deduction of an angular frequency command component.</p> |
