Patent ID: 6278194
Filing Date: 2001-08-21
Classification: F02N,H02K,H02P

Abstract:
A starter generator for an internal combustion engine operated as a starter motor when an internal combustion engine starts and as a magneto generator after said engine starts and comprising;a magnet rotor provided on a crank shaft of said engine and having a magnet field including main poles of 2m (m is an integral number of more than one) circular arc-shaped permanent magnets having a predetermined polar arc angle and 2m interpoles of circular arc-shaped ferromagnetic material having a permeability higher than said permanent magnets for said main poles and having an polar arc angle smaller than said polar arc angle of said main poles and said main poles and said interpoles being alternately disposed in a peripheral direction so that each interpole is symmetrically disposed on both sides of each of said main poles;a stator having an armature core with a plurality of teeth arranged in a peripheral direction and n (n is an integral number of more than two) phase armature coils of coil groups wound on said teeth of said armature core and connected to each other so as to form an n phase circuit so that leading ends of said teeth of said armature core form stator magnetic poles facing said the magnetic poles of said rotor;an inverter circuit having a switch circuit of 2n on-off controllable switch elements connected to each other in an n phase bridge form and an n phase diode bridge full-wave rectifier circuit formed of 2n diodes connected to the 2n switch elements in a reversely parallel manner and a pair of DC side terminals of said full-wave rectifier circuit are connected to both terminals of a battery while n AC side terminals of said full-wave rectifier circuit are connected to n terminals led out from said n phase armature coils;and an inverter controller to control said switch elements of said inverter circuit so that a drive current flows through said n phase armature coils so as to be transferred in a predetermined phase sequence from said battery via said switch elements of said inverter circuit when said internal combustion engine starts;said starter generator adapted to supply a charging current to said battery through said full-wave rectifier circuit by an induction voltage from said n phase armature coils after said internal combustion engine starts.