| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a position sensorless drive controller of a synchronous motor in which a motor can be driven stably by suppressing detection error of current phase information. <P>SOLUTION: A target current control section 131 in a motor control section 120 outputs correction information for reducing the applying voltage when the motor current decreases below a threshold, and advances the current phase in the direction of increasing the motor current thus sustaining the motor current at a specified value (threshold). Consequently, a synchronous motor 12 can be driven stably even when the load torque thereof decreases by suppressing zero-cross detection error of the motor current. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
