| 摘要 |
PROBLEM TO BE SOLVED: To accurately perform torque control by providing storing means which respectively store the inductance values of d- and q-axis and connecting the storing means to a normal operating voltage impressing means. SOLUTION: When a permanent-magnet synchronous motor 1 is operated normally, a switch 4 selects the output voltage of a normal operating voltage impressing means 3 and impresses the output voltage upon the motor 1. When the voltage is impressed upon the motor 1, the impressing means 3 respectively inputs the inductance Ld in the direction parallel to the direction of the permanent magnet of the motor 1 and the inductance Lq perpendicular to the direction of the permanent magnet from an Ld storing means 13 and an Lq storing means 14 so that such a voltage that makes the output torque of the motor 1 a prescribed value may be impressed upon the motor 1. Namely, the Ld storing means 13 stores the d-axis inductance Ld corresponding to each d-axis current outputted from a d-axis or second d-axis inductance calculating means 11. The Lq storing means 14 stores the q-axis inductance Lq corresponding to each q-axis current outputted from a q-axis or second q-axis inductance calculating means 12. |
