GF15.40-P-2000MCU Component Description For the Alternator

GF15.40-P-2000MCU Component Description For The Alternator







G2 Alternator

Location
The alternator is located on the suction side on the right on the engine.

Task
The alternator driven by a poly-V belt delivers an adequate amount of energy to the onboard electrical system for all rotational speed occurring during driving and thus ensures the on-board electrical system supply and charging of the battery (G1).

Design
The alternator is designed as a three-phase alternator with integrated regulation.

Control
Regulation of alternator takes place by integral electronics depending on the rotational speed and on-board power supply voltage. The alternator is directly connected with the ME-SFI [ME] control unit (N3/10).

Functional principle
Voltage generation in the alternator is based on the principle of induction. If a conducting loop (coil or winding) changes a magnetic field, an electrical voltage will be induced in the conducting loop. If a coil has a rotating, magnetic field running through it with a north and south pole then a sinusoidal alternating voltage is produced. The alternating voltage is rectified by diodes.

For an alternator one differentiates between three electric circuits:
Preexcitation power circuit
The preexcitation power circuit builds up a magnetic field in the excitation coil. After starting the engine the alternator excites itself. If the excitation current flows, the charge control and alternator warning lamp(A1e5) is switched off by the instrument cluster (A1).

Excitation power circuit
The excitation current builds up the magnetic field in the excitation coil of the rotor.

Charge power circuit
The charge power circuit supplies the on-board electrical system with electrical energy.