| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the matter that high precision torque control of an induction machine cannot be expected if the flux of the induction machine decreases excessively when torque control of the induction machine is carried out using an operated induction machine speed and the voltage is restricted at the time of weak excitation control operation or at the end of operation of the induction machine because operation accuracy of induction machine speed deteriorates due to quantization error. <P>SOLUTION: A flux command corrector is provided anew and an output of the flux command corrector, i.e. a correction flux command, is employed in torque control of an induction machine in place of a flux command. The flux command corrector comprises an absolute value operating unit outputting an amount of flux, a flux variation rate output unit outputting a flux variation, a flux variation integrator, a limiter outputting a lower limit flux command, and a lower limit unit receiving the flux command and the lower limit flux command and outputting the correction flux command. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
