Patent ID: 8710807
Filing Date: 2014-04-29
Classification: H02P

Abstract:
1. An electric rotating machine for a vehicle, comprising: a field coil of a rotor which magnetizes field magnetic poles of the rotor in response to an exciting current flowing through the field coil and generates a rotating magnetic field from a rotation of the rotor and the magnetized field magnetic poles; an armature coil of a stator, forming a multi-phase coil, which generates an alternating current voltage induced by the rotating magnetic field; a switching unit, formed of abridge circuit having a switching element of an upper arm and a switching element of a lower arm, which rectifies the alternating current voltage induced in the armature coil to an output voltage; a switching control unit which controls each of the switching elements of the switching unit to be set in an on state or an off state; a generator control device which controls the exciting current supplied to the field coil to control the output voltage of the switching unit, detects the rotation of the rotor from a phase voltage of the alternating current voltage of the armature coil, and stops or reduces the supply of the exciting current to the field coil when detecting no rotation of the rotor or a stop of the rotation of the rotor; a temperature detecting unit which detects a temperature of the switching unit; and an overheating protecting unit which performs an overheating protecting operation, when detecting that the temperature of the switching unit detected by the temperature detecting unit indicates overheating of the switching unit, to set one of the switching elements of the upper and lower arms in the on state and sets the other switching element in the off state.