| 摘要 |
<p>1. A device for correcting the alternating voltage supplied by a frequency converter feeding an asynchronous or synchronous motor, said converter comprising a controlled electronic switch bridge (101 to 106) effecting at least the switching of the motor (M) phases, said converter being controlled by a regulating device (3) receiving a reference voltage so as to provide the motor with an alternating current according to a known law, and comprising means (9) for applying at one input of said regulator (3) a signal adapted to roughly compensate the resistive drop in the windings of the motor for operation under charge and means (2, 6, 7) for detecting the operating mode of the motor without load under supercharging, characterized in that the compensation signal is formed by a biasing (P) which is either fixed or variable as a function of the current absorbed by the motor and in that the detecting means (2, 6, 7) of the operating mode without load under supercharging are sensitive to the derivative of the stator current and adapted to generate a correction signal subtracted from said biasing (P).</p> |
