| 摘要 |
PURPOSE:To stabilize a load motor in a full load range by inputting the output of a rectifier through a function generator to a variation detector. CONSTITUTION:A function generator 14 is connected to the output of a rectifier 13, and the output of the rectifier is connected to the input of a variation detector 15. The characteristics of the generator 14 is a function having saturated characteristics to the primary current i1. Since the detector 15 is, on the other hand, a differentiator and a V/F converter 11 is an integrator, the voltage phase of an inverter is returned to a function that the output of the generator 14 is proportional to a delay angle theta. Even if the primary current i1 of an induction motor 6 is varied, the terminal voltage e1 of the motor 6 can be compensated by moving the output voltage phase of the inverter by the delay angle theta so that the phase of the counterelectromotive force e0 of the motor 6 does not vary. |
