| 摘要 |
<P>PROBLEM TO BE SOLVED: To stably converge an estimation value of rotor angle by appropriately generating a reluctance torque even if a magnetic saturation is being generated. <P>SOLUTION: A phase difference estimation value ΘE is calculated as a value that varies according to a double angle of phase difference θe between the estimation value of a rotor angle and an actual value, based on the observation value of current variation in such state where the drive voltage of an armature is superposed with a high frequency cyclic signal, and the estimation value of the rotor angle is updated according to the ΘE. In the situation of magnetic saturation of a motor 1, a current command is determined so that the target phase of the current of the armature becomes phase θIa dislocated to a delay angel side from a phase θIab in which a ratio of the output torque of motor against a volume of current is maximum. <P>COPYRIGHT: (C)2011,JPO&INPIT |
