Alternator starter

Details Alternator starter Alternator starter

1991-05-07

1992-03-17

Scott, J. R.

Prime-mover dynamo plants

Electric control

Electric-starting motor with generator

290 31, 290 46, H02P 1100

Patent

active

050971409

ABSTRACT:
A combined starter motor and alternator for a vehicular engine system can be positioned for direct coupling to an engine power shaft between the engine and transmisson. A pair of axially offset magnetically permeable disks are bolted to the power shaft. These disks form an annular channel therebetween. A plurality of rare earth permanent magnets are mounted on the inside face of one of the disks in the channel. Positioned within the channel is a stationary, ironless stator assembly having stranded conductive wire windings embedded in an insulation matrix. These windings alternatively pass from the perimeter of the disk towards the interior of the disk as each winding forms a single pass around a longitudinal axis of the power shaft. In a starter mode of operation, a polarity sensor, such as a Hall-effect switch mounted adjacent each stator phase winding, is used to control the driver switches of a conventional H-type arrangement for providing drive current to a starter motor stator coil. The H-driver circuit features use of semiconductor switches capable of withstanding high reverse bias voltage in the H-legs extending between coil ends and the vehicle's battery or direct current energy source.

REFERENCES:
patent: 1250718 (1917-12-01), Turbayne
patent: 1325677 (1919-12-01), Midgley
patent: 2184236 (1939-12-01), Heintz
patent: 4219739 (1980-08-01), Greenwall
patent: 4862009 (1989-08-01), King
patent: 5001412 (1991-03-01), Carter et al.
Jay, Frank, Editor, IEEE Standard Dictionary of Electrical and Electronics Terms, Third Edition, 1984, p. 405.

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