| 摘要 |
PURPOSE:To compensate the fluctuation of the secondary resistance and of the preset error of an inductance constant. CONSTITUTION:The primary resistance R1 caused by the primary-current component and the voltage drop component of the primary equivalent leaking inductance are subtracted from voltage commands V1d and V1q of current control amplifiers 1A and 1B of axes (d)-(q), and the secondary induction voltage is obtained in a detecting part 2. The ideally spectrum-controlled secondary inverse electromotive voltage is obtained in an operating part 3. The vector phase phiof the primary current with respect to an exciting axis is obtained in a phase operating part 4. The coordinate component of the negative value of the phase phiis obtained in a detecting part 5 as the error voltage based on the value obtained by subtracting the secondary inverse electromotive voltage from the secondary induction voltage. The error voltage is obtained in a correcting part 6, which corrects the positive and negative values according to the polarity of a torque current command. The secondary resistance R2 is estimated based on the corrected error voltage. The secondary resistance of a sliding-frequency operating part 1E is corrected in a secondary-resistance correcting part 8. |
