| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a control method capable of assuring the synchronous start of at least two sensorless PMSMs by one inverter device, preventing oscillation generation during stable rated operation and low speed rotation, and controlling safe stop in case of failure. <P>SOLUTION: This synchronous start method provides for at least two sensorless permanent magnet synchronous motors (PMSM) which use a three-phase alternate power source as power. The three-phase alternate current with ultra-low frequency is temporarily applied to at least two PMSMs by one inverter device for a certain period to ensure that the motors can be synchronously started with low rotation, then their rotational speeds can be raised by gradually increasing the frequency of the power source to reach the rated rotation. <P>COPYRIGHT: (C)2008,JPO&INPIT |
