| abstract |
A constant detecting apparatus 15 comprising a detecting unit 26 and ancalculating unit 27. The detecting unit 26 is structured comprising a rotation sensor 41, antorque sensor 42, a position sensor 43, a rotor temperature sensor 44, a windingntemperature sensor 45, a phase voltage detector 46, and phase current detectors 47 and 47.nThe calculating unit 27 calculates the induced voltage constant Ke that changesndepending on the motor temperature Tmag while the motor 11 is being driven based onneach of the detected signals from the detecting unit 26, and at the same time, the d axisncurrent Id and the q axis current Iq are calculated after elimination of the iron loss, andnthe d axis inductance Ld and the q axis inductance Lq in the actual operating state of thenmotor 11 are calculated. |