| 摘要 |
<P>PROBLEM TO BE SOLVED: To execute emergency stop test operation without increasing PWM inverter capacity, even when a permanent magnet type synchronous motor is used for an elevator driving motor. <P>SOLUTION: At the time of emergency stop test operation, when the permanent magnet type synchronous motor detects connection changing of winding wire for generating larger torque than that of normal operation, a switching frequency of an inverter device for driving the permanent magnet type synchronous motor is set to be a lower value than that of the normal operation. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
