Patent ID: 8324774

Claim:
A rotating electrical machine apparatus comprising: a polyphase rotating electrical machine having a stator provided with a plurality of coil groups and a rotor provided coaxially with the stator, and a control device that controls a current supplied to the coil groups of the stator, wherein the stator having a portion facing the rotor, wherein the stator portion is provided with a stator friction portion, and the rotor having a portion facing the stator, wherein the rotor portion is provided with a rotor friction portion, the rotor is movable between a connection position and a separation position, wherein the connection position is defined by the stator friction portion and the rotor friction portion are in contact with each other and the rotor and the stator are connected with each other, and the separation position is defined by the stator friction portion and the rotor friction portion are separated from each other, and the rotor is provided to move to the connection position when at least two coil groups among the plurality of coil groups are simultaneously excited, and the control device comprises a rotor position control device that controls a current supplied to the coil groups so that at least two coil groups among the plurality of coil groups are simultaneously excited when prescribed connection condition is fulfilled.