Patent ID: 6119636
Filing Date: 2000-09-19
Classification: F02B

Abstract:
A portable generator, comprising:an engine for producing mechanical power, comprisinga spark-ignited internal combustion engine including a spark plug and a crankshaft rotatable by said engine;an engine fuel reservoir for containing a fuel;a carburetor for mixing air with said fuel and having an outlet connected to said spark ignited internal combustion engine and an inlet coupled to said engine fuel reservoir; anda starter means which is connected to a driven end of said crankshaft for starting said engine; anda generator directly connected to and driven by said engine for inducing electrical current by transforming said mechanical power produced from said engine into electrical energy, said generator comprising:a generator case comprises a supporting wall mounted to said engine and a generator cup coaxially attached on said supporting wall so as to define a generator chamber between said generator cup and said supporting wall, said supporting wall having a central hole enabling a driving end of said crankshaft to extend therethrough into said generator chamber; said generator cup having a cup wall and a circumferential wall extended from said cup wall to form a U-shaped cross section;a rotor unit which is housed in said generator chamber of said generator case and coaxially coupled with a driving end of said crankshaft, said rotor unit comprising a rotor cap having a circular base disc and a surrounding ring integrally and coaxially extended from a peripheral edge of said base disc, and a plurality of arc-shaped rotor magnets made of rare-earth metal being circularly attached to an inner circumferential surface of said surrounding ring of said rotor cap; anda stator which is coaxially affixed on said cup wall of said generator cup, wherein said stator is coaxially positioned within said rotor cap that said rotor magnets are arranged to coaxially surround said stator in such a manner that when said crankshaft rotates, said driving end of said rotating crankshaft drives said rotor cap to rotate inside said generator chamber, and that said rotor magnets is then rotating around said stator to induce electrical current, so that said mechanical rotation motion of said crankshaft of said engine is transformed into electrical energy due to said relative movement between a magnetic field of said rotor magnets and electrically conductive elements of said stator.