MAGNETIC POLE POSITION ESTIMATING METHOD, MOTOR SPEED ESTIMATING METHOD, AND MOTOR CONTROLLER

摘要

PROBLEM TO BE SOLVED: To reduce an error of an estimated magnetic pole position based on a harmonic component included in a motor current, while suppressing a computing load as compared with a conventional one in a synchronous motor.

SOLUTION: The harmonic component iγ_hof a γ-axis current value iγis extracted as the harmonic component of the motor current, then a compensation amount icompto the estimated magnetic pole position θreis directly computed from the extracted harmonic component iγ_h. In other words, in view of the harmonic component of the motor current becoming an error factor when the estimated magnetic pole position θreis obtained, the compensation amount icompcorresponding to the error of the estimated magnetic pole position caused by its harmonic component is directly obtained from the harmonic component iγ_hof the γ-axis current value iγby which the computing load to obtain the compensation amount icompis reduced as compared with the conventional one.

COPYRIGHT: (C)2007,JPO&INPIT