AC rotary machine drive system and an electric power steering system comprising a controller for an AC rotary machine, a controller for an AC rotary machine

A controller for an AC rotary machine according to the present invention, according to the AC rotary machine drive system comprising a control device for controlling the method and AC rotary machine of the AC rotary machine, the high frequency component is superimposed corresponding to the high frequency signal inputted to itself that supplies high frequency power to the AC rotary machine, and an output torque high frequency contained in the output torque of the AC rotary machine according to the phase difference between the RF signals, by calculating the rotational position of the AC rotary machine, AC rotational speed of the rotating machine, without imposed constraints such electrical saliency of presence and absence of magnetic saturation occurs, the control unit of the AC rotary machine capable of estimating the rotational position of the AC rotary machine, of the AC rotary machine it is possible to obtain an AC rotary machine drive system and an electric power steering system including a control device.