Section 2 Power Supply - ZONGSHEN ZS125-86 Service Manual

5. Short Circuit and Open Circuit
In the normal circuit, if the two wires from the power supply to the electrical equipment are directly
connected without electricity equipment, this phenomenon is called a short circuit. In a loop consisting of
the power supply, electrical equipment and connecting wires, as the wire is switched off, the current can
not form a closed loop, this phenomenon is called an open circuit.
6. Left-hand Rule and Right-hand Rule
In a magnetic field where the electromagnetic induction phenomenon occurs, extend the left hand
and flatten the palm. Let the thumb be vertical to the rest of the four fingers, so that the magnetic lines
perpendicular to the palm. The four fingers direct to the direction of the current. Then the direction of the
thumb is the direction of magnetic field force. This is called the Left-hand Rule.
Unbend the right-hand thumb. The four fingers hold the coil along the current direction. Then the
direction of the thumb refers to the magnetic line of force of the magnetic field generated by coil. This is
the Right-hand Rule
The structure and function of the electric system as an important part of the motorcycle has a direct
impact on the performance and riding comfort of the motorcycle.
The electrical system generally includes a power supply portion, an electricity consumption portion
and a control portion. As the ignition system in the electrical portions is the core of the motorcycle, the
ignition system will be illustrated as one part of the engine section. In the daily use, users should always
maintain the electrical system. The electrical schematic diagram is always used to detect common faults
of motorcycle electrical system, so the company generally provides electrical schematic diagrams in
motorcycle maintenance manuals and service manuals.
The power supply portion generally includes the magnetic motor (generator) and the storage battery.
Its main function: in the motorcycle's own closed circuit, the magnetic motor and the battery provide
electricity through the parallel operation to the electricity consumption portion, and store the excess energy
in the battery.
1. Structure and Working Principles of Power Supply Portion
The power supply portion generally includes the magnetic motor (generator) and the storage battery.
Its main function: in the motorcycle's own closed circuit, the generator and the battery provide electricity
through the parallel operation to the electricity consumption portion, and store the excess energy in the
battery.
Generators, according to different features of output currents, can be divided into DC generators and
alternators. Depending on structures, alternators can be divided into flywheel alternators, magnet rotor
alternators and three-phase alternators. The magnetic poles in the first two alternators are permanent
magnets, so they are also known as permanent magnet alternators; the latter is to produce magnetic
poles by energizing the coils, so it is also called exciter alternator. Generally, a magnetic motor refers to a
flywheel alternator.
Storage batteries can be divided into 6V battery and 12V battery, based on rated voltages. Storage
batteries with identical rated voltages can be divided into multiple types according to battery capacity. In
accordance with structures, storage batteries can can be classified into lead-acid batteries and fully sealed
maintenance-free batteries.
[1.]Structure and principles of DC magnetos
A DC magneto works based on the principles of electromagnetic induction, that is, when the wire

Section 2 Power Supply

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