초록 ▼

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 w

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.

대표청구항 ▼

In an internal combustion engine having a cylinder and a crankshaft defining an axis of rotation, the improvement of an electronically commutated coaxial starter motor comprising: a stator mounted on the cylinder coaxially with the crankshaft; angularly spaced field windings surrounding said stator;

In an internal combustion engine having a cylinder and a crankshaft defining an axis of rotation, the improvement of an electronically commutated coaxial starter motor comprising: a stator mounted on the cylinder coaxially with the crankshaft; angularly spaced field windings surrounding said stator; position indicating means coaxially mounted to rotate with the crankshaft; stationary sensing means mounted to sense the angular position of said position indicating means and generate electrical signals in response thereto; a rotatable member coaxially mounted to rotate with the crankshaft, said rotatable member including a plurality of circumferentially spaced permanent magnets mounted thereon; and circuit means responsive to the electrical signals from said sensing means for controlling current flow through said field windings to cause said rotatable member to rotate, said electronic circuitry includes power switching devices each device having a diode connected in reverse polarity and in parallel with its respective power switching device in the circuit for converting alternator output to direct current.