Electronically commutated coaxial starter motor/alternator for a

Details Electronically commutated coaxial starter motor/alternator for a Electronically commutated coaxial starter motor/alternator for a

1986-07-31

1988-01-19

Miller, Charles D.

Prime-mover dynamo plants

Electric control

Electric-starting motor

290 48, F02N 1108

Patent

active

047206381

ABSTRACT:
An electronically commutated coaxial starter motor for use with internal combustion engines of the type including those utilized with lawn mowers, pumps, generators, automobiles and the like. The motor includes a stator mounted on the cylinder or block coaxially with the engine crankshaft together with angularly spaced field windings surrounding the stator, a ring magnet mounted to rotate with the crankshaft composed of a plurality of circumferentially arranged permanent magnets having alternating north-south poles, sensors in the form of magnetically actuated Hall effect devices mounted on a disc affixed to the stator for sensing the angular position of alternate ones of the poles of the ring magnet, a flywheel or other suitable rotatable member coaxially mounted to rotate with the crankshaft having a plurality of circumferentially spaced permanent magnets mounted therein, and circuitry responsive to electrical signals from the Hall effect devices for controlling current flow through the field windings to cause the flywheel or other rotatable member to rotate. Upon engine start-up, the flywheel or other rotatable member with the plurality of cirumferentially arranged permanent magnets is driven by the internal combustion engine and is automatically converted to an alternator. The conversion to direct current occurs in the incipient diodes internal to switching devices such as mosfets or in flyback diodes connected across other suitable power switching devices in the circuitry. This available power is used for battery charging and other system power requirements.

REFERENCES:
patent: 3591844 (1971-07-01), Schonebeck et al.
patent: 3908130 (1975-09-01), Lafuze
patent: 4219739 (1980-08-01), Greenwell
patent: 4401938 (1983-08-01), Cronin
patent: 4459536 (1984-07-01), Wirtz

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