US 5,543,703 AGranted

Generator motor for vehicles

AssigneeNippondenso Co., Ltd.

InventorsShin Kusase, Kenzo Mitani, Atsushi Umeda, Norihito Tokura, Hirohide Sato

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Abstract

A vehicular generator motor performing generator operation and motor operation is disclosed. The generator motor comprises an AC-DC converter means and a switching means. The converter means is composed of a plurality of MOSFETs and connected between each armature coil and a vehicular storage battery. Alternating current produced across the coils is converted into a direct current for charging the battery by the AC-DC converter means in generator operation mode. In motor operation mode, the DC output from the battery is converted into an alternating current for setting up a rotating magnetic field by the converter means, and the battery output is fed to the armature coils. The mode of operation of the MOSFETs is switched between these two modes by the switching means. The rotating field produces a certain phase difference with the magnetic field developed by the rotating magnetic poles. The MOSFETs are made of SiC having a smaller resistivity than that of Si. This ensures a high withstand voltage necessary during power generation. Loss caused by large current flowing in the motor operation mode is reduced. Good driving torque can be obtained.

Claims10

Dependent claims

A generator motor installed on a vehicle and performing generator operation and motor operation, said generator motor comprising:

a rotor having a rotating shaft and magnetic poles rotating with said rotating shaft which is driven by a crankshaft of an engine mounted on said vehicle, said rotating shaft being held to a housing;
an armature having a core firmly mounted to said housing and coils of plural phases, said coils being wound on said core;
an AC-DC converter means having plural MISFETs and connected between said coils of said armature and a storage battery, said AC-DC converter means acting to convert an AC output developed by said coils into a DC output used for charging said battery when said MISFETs are in a generator operation mode and to convert a DC output from said battery into an AC output for producing a rotating magnetic field when said MISFETs are in a motor operation mode, said rotating magnetic field producing a certain phase difference with said rotating magnetic poles, each of said MISFETs being made of silicon carbide (SIC) which is a chemical compound of silicon (Si) and carbon (C) and has a lower resistivity than silicon;
and
a switching means for switching mode of operation of said MISFETs between said generator operation mode and said motor operation mode.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/362,408Filed 23 Dec 1994
Priority: JP 5-32659724 Dec 1993
Granted: 6 Aug 1996
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

H10D 30/668
Vertical dmos [vdmos] fets: having trench gate electrodes, e.g. UMOS transistors
H02J 7/1492
Regulation of the charging current or voltage otherwise than by variation of field: by means of controlling devices between the generator output…
H02M 7/219
Using semiconductor devices only: in a bridge configuration
H02P 9/48
Arrangements for controlling electric generators for the purpose of obtaining a desired output: arrangements for obtaining a constant output value…