| 摘要 |
PURPOSE:To preferably control an induction motor without disorder in the characteristic of a speed control system by applying a voltage to the motor to flow a current when the motor is stopped, operating the secondary resistance value from the voltage and the current and correcting parameter value. CONSTITUTION:When a cage 10 is stopped, a voltage is applied from a voltage supplying circuit 112 through a converter 113 to an induction motor 6. The current and the voltage at this time are detected, input to the secondary resistance value calculator 114 to calculate the secondary resistance value and to correct parameter value, thereby generating a signal in response to the ratio Rr/Rr0 of the true value Rr of the primary resistor and the parameter value Rr0. Thus, since the value Rr0 of the secondary resistor is corrected only at the stopping time of the cage 10, the fixed secondary resistance correcting value is merely used as parameter while the cage 10 is elevating. Accordingly, no disorder may be applied to the characteristic of the speed control system of an elevator by the correcting circuit. |
