To appropriately control a phase difference between two rotors provided in a motor and easily determine the presence or absence of any anomaly related to the operation of changing the phase difference between the rotors.
A motor 1 has two rotors 3, 4 and a phase difference between the rotors 3, 4 can be changed by a phase difference change driving means 23. A controller 50 includes a means 55 for controlling the phase difference change driving means 23 according to the deviation between a target value Ke_c and an observed value Ke_e of the induced voltage constant parameter of the motor 1 so as to eliminate the deviation. Further, the means determines the presence or absence of any anomaly in the operation of changing a phase difference between the rotors based on the above deviation. The integration value of the deviation is used to determine the presence or absence of any anomaly.
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TANAKA MASASHI
FUJISHIRO NAOKI
TSUTSUMI DAISUKE
KOJIMA HIDEICHIRO
Susumu Hori
Takeshi Sagi
Kenichi Homma
Tsuyoshi Kagaya