| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a motor drive device that can drive a motor at a higher speed by injecting an optimum amount of negative field component current. <P>SOLUTION: When an estimated rotor speed ωm is a set value or more, a motor control section calculates a desired value Idref of a field component current by adding a negative field component current Id increasing/decreasing with increasing/decreasing estimated rotor speed ωm, and variably sets the increase/decrease rate of the negative field component current Id according as the estimated rotor speed ωm is high. <P>COPYRIGHT: (C)2013,JPO&INPIT |
