| 摘要 |
PURPOSE:To enable to operate an induction motor at the limiting performance by controlling a secondary crossing magnetic flux vectors constantly. CONSTITUTION:The primary terminal voltage E1 of an induction machine 10 is inputted to a secondary crossing magnetic flux vector calculator OP, which, in turn, outputs a secondary crossing magnetic flux phi2. An exciting current command IOS is produced from a proportional integral amplifier Aphi in accordance with the deviation between the magnetic flux amplitude command phiS and the secondary crossing magnetic flux phi2. A motor is driven in accordance with the primary current command I1S of the sum of the secondary current command I2S and the exciting current command I0S. On the other hand, a phase locked loop PPL controls to set the phase difference between the magnetic flux command phiS and the secondary crossing magnetic flux phi2, and the primary frequency f1 is produced from the proportional integrator Atheta in response to the phase difference. In this manner, it is controlled so that the secondary crossing magnetic flux phi2 becomes constant, thereby controlling with F/f constant. |
