| 摘要 |
PROBLEM TO BE SOLVED: To improve the comfortableness of an elevator car by controlling the frequency torque tipple caused by the imbalance in the parameters of an induction motor and the errors in the gain of a circuit to detect each phase current. SOLUTION: This elevator speed control device is provided with a speed controller 42, which outputs torque component current command Td to an induction motor, a two-phase synchronizing coordinate converting section 48, which outputs torque current Tr using the three-phase current detected from the induction motor, and a current controller 44, which outputs the voltage command of the induction motor. In addition, this elevator speed control device is provided with a current correction section 46, which outputs correction current ia', ib' and ic', which are corrected so that zero-phase-sequence component current is canceled from the three phase current ia, ib and ic that were detected. |
