| 摘要 |
PURPOSE:To enhance the responsiveness for controlling by digitally controlling an exciting current as a reference, and correcting a counterelectromotive force, thereby smoothing the responsiveness at a transient time. CONSTITUTION:A speed command VCMD and a feedback speed voltage output from a frequency/voltage converter 4 are compared to obtain a torque command TC. An exciting current generator 9 obtains an exciting current I0 from a torque command TC. The secondary current generator 10 obtains the secondary current I2. The primary current amplitude and phase generator 12 obtains the primary current amplitude ¦I1¦ and a phase thetac. Phase current command calculators 15 obtain phase current commands, obtain voltage commands from a current deviation from a feedback current from a current loop, and superpose electromotive forces for correcting the counterelectromotive force calculated on the basis of the current I0 by an electromotive force generator 29 on the voltage command. |
