Is there an over volatge fault in an alternator?
Over volatge fault of an alternator is very rare, as the excitation current that controls the voltage has closed supervision with AVR, automatic voltage regulator system. However, if somehow alternator suddenly disconnected from the load, its speed exceeds rated speed, over voltage might occur.
What kind of coil does a star alternator use?
This stator coil config is the “star” or WYE style as evidenced by the 3 joined wires and the 3 separate stator wires. Simplified explanation is that star gives more voltage and delta gives more amps for a given rpm.
What kind of current does an alternator have?
The rotor consists of a coil of wire wrapped around an iron core. Current through the wire coil – called “field” current – produces a magnetic field around the core. The strength of the field current determines the strength of the magnetic field. The field current is D/C, or direct current.
How is the rotor connected to the alternator?
• The rotor contains the field winding wound over an iron core which is part of the shaft. • Surrounding the field coil are two claw-type finger poles. • Each end of the rotor field winding is attached to a slip ring. Stationary brushes connect the alternator to the rotor.
What happens when the battery voltage goes up in an alternator?
Conversely, if the battery voltage goes up, less field current goes through the rotor windings, and the output voltage is reduced. Field current supply is provided from two different sources – from the alternator itself, via the diode trio, and from the battery, via the alternator warning lamp.
Where does the field current come from in an alternator?
At this time, the voltage/current source for the field current is from the battery, through the ignition switch, and through the warning lamp. After the engine is started, and the alternator is up to speed, the output of the diode trio is fed back to the regulator, and serves as a source of current for the field current.
Where is the voltage regulator on a brushless alternator?
Brushless alternators use a stationary rotor coil inside the spinning rotor. The voltage regulator, as its name implies, is used to control the voltage output of the alternator. The voltage regulator is either internal in the alternator or external mounted on the alternator or remotely mounted.
What is the wire that turns on the alternator?
• B is the alternator output wire that supplies current to the battery. • IG is the ignition input that turns on the alternator/regulator assembly. • S is used by the regulator to monitor charging voltage at the battery.