| 摘要 |
<p>1. Device for stabilizing the torque of an electric motor (M) of the electric commutator type, supplied with current from a dc source (Uc) through a frequency converter comprising a current converter and an inverter (T1 -T6 ) controlled by a variable-frequency frequency generator (G), said device comprising means (C) for comparing an electrical magnitude responsive to the motor speed with an electrical magnitude (Up) proportional to the momentary voltage or said dc voltage source (Uc) applied to the terminals of said converter, and delivering a magnitude corresponding to the measured variation, and means for applying a corrective magnitude to said frequency generator, characterized in that said device further comprises means for measuring an electrical magnitude (Ua) proportional to the motor speed for applying to said comparator means (C) an electrical magnitude (Ua) proportional to the momentary speed of said motor, and that the variation (delta U) measured by said comparator means corresponds to the difference between a constant regulation voltage of the ratio of the two compared magnitudes and the measured value of said ratio.</p> |
