| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a control device of a motor for overcurrent protection of a power inverter circuit as well as avoidance of shutdown, suppressing an unwanted current caused by load disturbance from flowing through a synchronous motor. <P>SOLUTION: A primary phase current supplied to a synchronous motor SM from a power inverter circuit 4 is detected by current detectors 9 and 10, and a current component is calculated from the detected value by a current component calculation circuit 7. Meanwhile a frequency correction calculation circuit 8 acquires a frequency correction amount from a current set value set by a current setting circuit 5 and a current component calculated by the current component calculation circuit 7. A current of the current set value is made to flow during acceleration/deceleration operation, but the current is suppressed when no acceleration/deceleration operation is made. Based on a primary frequency that is obtained by subtracting a frequency correction amount from a primary frequency command value, a voltage command calculation circuit 3 calculates a primary voltage command value and outputs the calculated value to the power inverter circuit 4. <P>COPYRIGHT: (C)2012,JPO&INPIT |
