Abstract: A control device for an AC rotating machine includes: an inverter; an electric current detector; a first axis voltage command value calculator configured to calculate a voltage command value of a first axis between two rotational axes; and a second axis voltage command value calculator configured to calculate a voltage command value of a second axis between the two rotational axes. The first axis voltage command value calculator includes a gain changer configured to change a set value of a gain based on a detected electric current value of the first axis or a first deviation, performs integral calculation using an integral input calculated based on the gain and a second deviation, and calculates the voltage command value of the first axis based on a result of the integral calculation.

Abstract: A control device of an AC rotating machine includes an inverter, a current detector, a first axis voltage command value calculator, and a second axis voltage command value calculator. The first axis voltage command value calculator performs an integral calculation using a first deviation that is a deviation between a current command value on the first axis and a detected current value of the rotating machine current on the first axis, and a second deviation that is a deviation between a current command value on the second axis and a detected current value of the rotating machine current on the second axis, and calculates the voltage command value of the first axis on the basis of the result of the integral calculation.

Abstract: A control device for an AC rotating machine includes: an inverter; a DC power supply; an electric current detector; a first axis voltage command value calculator configured to calculate a voltage command value of a first axis between two rotational axes of the AC rotating machine; and a second axis voltage command value calculator configured to calculate a voltage command value of a second axis between the two rotational axes. The first axis voltage command value calculator calculates the voltage command value of the first axis based on a corrected first deviation obtained by multiplying a first deviation by a correction gain, a second deviation, and a rotational angular velocity. A set value of the correction gain is increased when a physical quantity in the AC rotating machine has rapidly changed or when an output voltage of the DC power supply has increased.

Abstract: A rotating machine control device includes: an inverter that applies a voltage; a current detector provided in the inverter detecting current that flows through, and a controller outputting a voltage command value to the inverter based on a control command, wherein the controller has: a torque current command value generator calculating a torque current command value based thereon; a weakened field current command value generator for calculating a weakened field current command value, and a voltage command value calculator calculating voltage command value based on current command values of the torque and the weakened field, and the weakened field current command value generator outputs a first weakened field current command value as the weakened field current command value, wherein the first weakened field current command value restricts a modulation rate of the inverter to a first threshold value so the current detector is capable of detecting at least two phases.

Abstract: In an electric car comprising a car body and a plurality of electric devices separately arranged on the undercarriage according to their functions, a magnetic shield system in which the plurality of electric devices are electrically connected through wires adjacent ones of which conduct substantially the same magnitude of current flowing in opposite directions.