Patent ID: 7872440

Claim:
A controller of an electric motor of an axial air-gap type comprising a rotor having a permanent magnet, and a first stator and a second stator oppositely arranged through the rotor in a rotation axis direction of the rotor; wherein the controller comprises a driving mode switching means for switching between a both-side stator driving mode for supplying a driving electric current to both an armature winding of the first stator and an armature winding of the second stator, and a one-side stator driving mode for supplying the driving electric current to only the armature winding of the first stator, in accordance with a request value of output torque of the electric motor wherein the controller further comprises a change-over switch for switching connection between the armature winding of the second stator and a driving circuit of the armature winding of the second stator to a conducting state and an interrupting state, and wherein the driving mode switching means sets the portion between the armature winding of the second stator and the driving circuit of the armature winding of the second stator to the interrupting state by the change-over switch in the one-side stator driving mode.