Patent ID: 7898199
Filing Date: 2011-03-01
Classification: B60L,B60Y,H02K,H02P,Y02T

Abstract:
1. A controller of an electric motor, comprising: a rotor including a permanent magnet; two stators arranged coaxially with the rotor to share a center axis of rotation, wherein one stator is provided on each side of the rotor in an axial direction of the center axis of rotation; and an armature winding mounted to each stator, wherein the controller comprises an electric current conduction control means which controls electric currents supplied to the armature windings of the stators, the electric current control means setting, in a predetermined operating state of the electric motor, a phase difference between an electric current supplied to an armature winding of one of the stators and an electric current supplied to an armature winding of the other stator so as to generate a skew electrically to suppress a variation in an output torque of the electric motor, and supplying electric currents having the phase difference to the armature windings of the stators, wherein the electric current control means controls electric currents supplied to the armature windings of the stators so that, in an operating state other than the predetermined operating state of the electric motor, an electric current supplied to the armature winding of the one of the stators and an electric current supplied to the armature winding of the other stator are in a same phase, and wherein the electric motor is an axial air-gap motor.