| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a position sensorless drive controller for a synchronous motor in which the efficiency can be enhanced furthermore by enhancing a utilization rate of a DC voltage being input to an inverter circuit. <P>SOLUTION: A motor control section 120 comprises a section 123 for detecting a current phase difference between a target current phase and a detected current phase, and feeding the difference between a value obtained by passing the detected current phase difference through a low-pass filter 128 and the value before passing through the low-pass filter 128 back to the target current phase. Consequently, speed variation can be corrected during rotation of a motor and motor rotation can be stabilized. A utilization rate of a DC voltage being input to an inverter circuit can be enhanced by employing such a logic. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
