Component description for the alternator - GF15.40-P-2000MCU

ENGINE 132.9 in MODEL 451.3 /4 

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 on-board 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.