Patent ID: 7755314

Claim:
An electric motor-equipped vehicle comprising: an internal combustion engine serving as a driving source of a drive wheel on one of a front wheel side or a rear wheel side; and an electric motor which is driven by a power supply from a storage apparatus and serves as a driving source for drive wheels on the other, wherein the electric motor comprises: an inner circumference side rotor and an outer circumference side rotor which are each provided with magnet pieces, and rotation axes of which are coaxially arranged; a stator which is arranged on an outer circumferential side of the inner circumference side rotor and the outer circumference side rotor; a phase modification device capable of modifying a relative phase between the inner circumference side rotor and the outer circumference side rotor, wherein, in a state driving the drive wheels on the front wheel side and the rear wheel side, the phase modification device modifies a relative phase between the inner circumference side rotor and the outer circumference side rotor so that a mutually field strengthening state is developed by a field flux from the magnet pieces of the inner circumference side rotor and a field flux from the magnet pieces of the outer circumference side rotor, and wherein in a state driving the drive wheels on the front wheel side or the rear wheel side, the phase modification device modifies a relative phase between the inner circumference side rotor and the outer circumference side rotor so that a mutually field weakening state is developed by a field flux from the magnet pieces of the inner circumference side rotor and a field flux from the magnet pieces of the outer circumference side rotor.