| 摘要 |
PURPOSE:To eliminate a starting shock due to the rising insufficiency of the secondary magnetic flux at the next starting time even if the primary current is once interrupted when an elevator is landed to a floor by controlling to feed back with respect to the secondary magnetic flux. CONSTITUTION:A circuit for calculating the secondary magnetic flux has a divider 6, an integrator 7 and a coefficient multiplier 7'. Rr, Lr of the multiplier 7' employ accurate values based on the secondary resistance value and the secondary inductance value of an induction motor 2. The secondary magnetic flux of the output of the multiplier 7' and the output of a magnetic flux command signal generator 14' are compared by a subtractor 12, the magnetic flux deviation output is amplified by an amplifier 13, and controlled so that the magnetic flux of the motor 2 always becomes equal to the prescribed command value. |
