| 摘要 |
<P>PROBLEM TO BE SOLVED: To exactly detect the initial magnetic pole position of a permanent magnet motor at a high speed. <P>SOLUTION: The method for detecting initial magnetic pole position in permanent-magnet motor first determines a PWM pulse width D<SB>t</SB>applied to a stator, where the PWM pulse width D<SB>t</SB>depends on motor parameters. Six voltage vectors are then successively applied to the stators and the associated current rising time are calculated. The position of a rotor is determined based on the shortest current rising time. The voltage vectors are again successively applied to the stators to recalculate the position of the rotor. The position of rotor can be precisely determined when the two calculations are consistent. When the two calculations are not consistent, the voltage vectors are again successively applied to the stators to recalculate the position of rotor until the calculations are consistent. The set current level is made to be larger than the motor rated current, for example, 160% motor rated current, to facilitate the determination of current rising time. The set current level can be 160% drive rated current when the motor rated current is larger than the drive rated current. <P>COPYRIGHT: (C)2009,JPO&INPIT |
