H - Electricity – 02 – K
Patent
H - Electricity
02
K
310/37
H02K 29/08 (2006.01) F02B 61/04 (2006.01) F02B 63/02 (2006.01) F02N 11/04 (2006.01) F02N 11/08 (2006.01) H02K 7/18 (2006.01)
Patent
CA 1285979
ELECTRONICALLY COMMUTATED COAXIAL STARTER MOTOR/ALTERNATOR FOR AN INTERNAL COMBUSTION ENGINE Abstract of the Disclosure 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 in- cludes a stator mounted on the cylinder or block co- axially with the engine crankshaft together with angu- larly spaced field windings surrounding the stator, a ring magnet mounted to rotate with the crankshaft com- posed 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 suit- able 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 mem- ber to rotate. Upon engine start-up, the flywheel or other rotatable member with the plurality of circumfe- rentially arranged permanent magnets is driven by the internal combustion engine and is automatically conver- ted 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.
542234
Vollbrecht Kenneth A.
Briggs & Stratton Corporation
Johnson Ernest Peter
Vollbrecht Kenneth A.
LandOfFree
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