| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide the weakening field vector controller of a permanent magnet synchronous motor which realizes a high accuracy and high response motor torque even in a weakening field region and which is applicable commonly even in a system which performs a cheap current detection or a system which omits a pole position detector. <P>SOLUTION: The control gain of an operating part for forming a d-axis current command is automatically corrected according to the frequency command value of the motor. Further, the d-axis current command generated at the time of no load is obtained previously by the operation, and added to the output of the operation part for forming the d-axis current command value. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
