Patent ID: 7358698
Filing Date: 2008-04-15
Classification: H02K,H02P

Abstract:
1. A field-winding type of synchronous machine comprising: a stator on which an armature winding is wound phase by phase for multiphase excitation; a rotor having a rotor core on which a field winding is fixedly wound and being located to be opposed to the stator; a power circuit configured to enable an armature current to pass the armature winding in each phase, the armature current being a synchronous current producing a rotation field rotating at an electrical-angle rotation speed agreeing to a rotation speed of the rotor; a current suppressor connected to the field winging and configured to suppress, into a unidirectional current, an induced alternating current induced through the field winding in response to the armature current passing the armature winding; and a current supplier configured to supply, phase by phase, to the armature winding a rotor exciting current whose waveform is different from the synchronous current only during a predetermined period of time shorter than one cycle of the synchronous current to be supplied through the armature winding.