Motorcycle electrical circuit classification
The electrical circuit of a motorcycle is basically similar to that of a car. The electrical circuit is divided into several parts: power supply, ignition, lighting, instrumentation and audio.
The power supply part is generally composed of an alternator (or powered by a magneto charging coil), a rectifier, and a battery. The magneto used in motorcycles also has various structures depending on the model of the motorcycle. Generally, there are two forms of flywheel magneto and magnetic steel rotor magneto. The flywheel magneto is generally used on small-displacement miniature and mopeds. Inside the flywheel, four magnets are evenly distributed, which rotate together with the engine crankshaft. The stator frame is fixed on the crankcase, and the magnets are fixed on it. The motor coil, lighting coil, and circuit breaker assembly, when the flywheel rotates, the magnetic field lines alternately pass through each coil, so that the coil generates an inductive alternating current. In the magnetic steel rotor type magneto, its structure is opposite to the above. There are six magnetic steels evenly distributed on the circumference of the rotor. The magnetic steel and the rotor are die-cast together with aluminum alloy, and the rotor is connected with the crankshaft by keys. There are six groups of coils wound around the iron core in the stator. When the rotor rotates in the stator, the magnetic lines of force alternately pass through the stator coils to generate induced alternating current.
There are three ignition methods for motorcycles: battery ignition system, magneto ignition system and transistor ignition system. In the ignition system, it is divided into two types: contact capacitor discharge ignition and non-contact capacitor discharge ignition. The English abbreviation of non-contact capacitive discharge is C.D.I. C.D.I actually refers to a combined circuit composed of a capacitor charging and discharging circuit and a thyristor switch circuit, commonly known as an electronic igniter.
There are wires of various colors in the motorcycle circuit. It is customary to use the red wire as the power "+" wire, the black wire as the ground wire "-", the orange wire as the ignition coil wire, and the magneto output current as the white wire , blue is the headlight line, etc., this is just a general idiom for reference.
