| 摘要 |
<P>PROBLEM TO BE SOLVED: To precisely estimate a rotor angle or a rotor position of an electric machine. <P>SOLUTION: Position samples are stored from an encoder 115 coupled to a permanent magnet electric machine 117. A data processor determines a first position change between successive position samples and second changes of successive first position changes.The data processor determines whether each first position change increases or decreases on the whole, or is constant. A correction position coefficient is applied to the respective stored position samples according to whether the first position change increases or decreases. The data processor estimates a final rotor angle of the electric machine based upon specific one of specific position samples and a corresponding position change related to specific one of position samples corresponding to respective points of time. <P>COPYRIGHT: (C)2013,JPO&INPIT |
