Abstract An ignition system for internal-combustion micro-engines comprising an ignition magneto provided to energize a spark plug by means of an electric current fed through a contact breaker controlled by a cam and designed to become operative in conditions of maximum current, characterized by the fact that said magneto is so shaped and dimensioned as to be comprised within the engine clearance gauge, the inductor of said magneto being mounted into a housing defined between the blades of the engine fan which is fixed on the driving shaft, said inductor having its pole shoes set at a right angle to the rotation axis of the driving shaft, while the armature comprises a three leg core, where said legs are parallel to the said rotation axis and are simmetric with respect of a plane passing through said rotation axis, said armature core being constituted of a laminated iron structure, wherein the central leg which supports the primary and secondary winding, has a thickness smaller than that of the side legs which are identic, while the outer surfaces of said three legs are coplanar, the inductor being constituted of a two leg core, wherein the transverse centre plane passes through the axis or the fan rotor supporting said inductor, while the thickness of the inductor core legs is greater than that of the core legs of the armature so as to obtain towards the rotation axis of the ignition system a zone of electromagnetic leakage in order to produce a flattening of the peaks of the current curve.
In an ignition system for internal-combustion micro-engines comprising an ignition magneto provided to energize a spark plug by means of an electric current fed through a contact breaker controlled by a cam and designed to become operative in conditions of maximum current, wherein said engine includes a rotatable cooling fan spaced from said engine and mounted on a drive shaft, the improvement comprising a magneto shaped and dimensioned to be comprised within the engine clearance gauge, said magneto including an inductor mounted between the blades of the engine fan, said inductor including pole shoes set at a right angle to the rotational axis of the driving shaft, an armature spaced from said inductor comprising a three leg core, where said legs are parallel to the said rotational axis, the central leg supports the primary and secondary winding of said armature, and has a thickness smaller than that of the side legs, the inductor being formed of a two leg core, the thickness of the inductor core legs being greater than that of the core legs of the armature, whereby a zone of electromagnetic leakage is obtained to yield a flattening of the peaks of the current curve.
Claim 2
Dependent Claim
197 words
In an ignition system for internal-combustion micro-engines comprising an ignition magneto provided to energize a spark plug by means of an electric current fed through a contact breaker controlled by a cam and designed to become operative in conditions of maximum current, wherein said engine includes a rotatable cooling fan spaced from said engine and mounted on a drive shaft, the improvement comprising a magneto shaped and dimensioned to be comprised within the engine clearance gauge, said magneto including an inductor mounted between the blades of the engine fan, said inductor including pole shoes set at a right angle to the rotational axis of the driving shaft, an armature spaced from said inductor comprising a three leg core, where said legs are parallel to the said rotational axis, the central leg supports the primary and secondary winding of said armature, and has a thickness smaller than that of the side legs, the inductor being formed of a two leg core, the thickness of the inductor core legs being greater than that of the core legs of the armature, whereby a zone of electromagnetic leakage is obtained to yield a flattening of the peaks of the current curve.
Claim 3
Dependent Claim
71 words
The magneto ignition system of claim 1 wherein said inductor pole pieces are positioned on a chord of said fan rotor being substantially equidistant from said fan rotor axis, said armature pole pieces having faces which confront said inductor pole piece faces such that upon rotation of said fan only a portion of the surfaces of said armature side leg pole pieces are traversed by said inductor pole piece confronting faces.
Claim 4
Dependent Claim
25 words
The magneto ignition system of claim 1 wherein said fan rotor further includes ignition contact breaker means in electrical communication with said armature primary windings.
Claim 5
Dependent Claim
22 words
The magneto ignition system of claim 1 wherein the inductor and armature pole pieces have faces which are substantially rectangular in shape.