| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve control quality by restraining hunting due to overcurrent caused by phase shift, in a brushless motor controller which conducts phase estimation by measuring a change in a position signal and time while using an inexpensive Hall sensor used in a 120 ° electrical conducting method. <P>SOLUTION: A phase shift detection means detects the phase shift (step 203), and where there is no reverse motor rotation (step 204), an increment in the absolute value of a torque signal Vt is less than a prescribed value (step 205), and the absolute value of the torque signal Vt does not change from a decrease to an increase (step 206). A prescribed current decrease rate K determined by the step 207 is multiplied by a reference current command value ImO corresponding to a torque signal Vt, and current decreasing operation for forming a current command value Im lower than usual is performed. <P>COPYRIGHT: (C)2004,JPO |
