| 摘要 |
PURPOSE:To control a vector ideally without depending upon load, etc., by obtaining a second order time-constant compensating value from a speed variation section and an output from a signal generator and compensating the change of a second order time-constant. CONSTITUTION:A speed variation section ed computed by a speed variation section computing section 22 and an output signal insinomegaft from a signal generator 11 are arithmetically operated by a second order time-constant compensating arithmetic section 12. A second order time-constant tau2' used for a slip-frequency arithmetic section 5 is changed from an exciting current command i0' and an arithmetic output from the second order time-constant compensating arithmetic section 12. Angular frequency omega0 is acquired from the slip frequency obtained in this manner and the detecting speed omega of an induction motor IM2, and trigonometric functions sinomega0t, cosomega0t are generated by a trigonometric-function generating section 14. Current commands ia', ib', ic are acquired as an output from a two phase/three phase conversion section 4 from the added output ioo' of the trogonometric functions, a torque current command it', the exciting current command and the output signal from the signal generator. An inverter 8 is controlled by the current command, and the IM 2 is vector-controlled. |
