| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a motor controlling device that makes it possible to start a motor smoothly, when it is started from the state that a permanent magnet motor is rotating. <P>SOLUTION: When a slip determining means 18 determines immediately after a start that the motor is rotating, a presumed gain by a rotor position presuming means 15 is increased to quicken presuming response until the DC component of a value, obtained by subtracting the product of a d-axis voltage high-frequency component and a d-axis current high-frequency component from that of a q-axis voltage high-frequency component and a q-axis current high-frequency component calculated by the rotor position presuming means 15, converges into a prescribed range. The presuming gain is returned to a normal state after the conversion of the DC component into the prescribed range. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
