8
4.
TECHNICAL INFORMATION
Using the generator
Axle shaft generators EZG 24/2 to EZG 66/4 are designed for mobile use,
independent of the power grid, with one more electrical/electronic appliances (230V /
50Hz or 400V / 50Hz) in continuous operation.
They are driven through a standard shaft connection (450 rpm), and attached at 3
points for flanging to the tractor.
Only operate in a dust-free and dry environment!
Design and operation
The three-phase generator is an electrical machine intended to convert mechanical
energy into electrical energy. In the application presented here, the mechanical
energy from the axle shaft of a tractor is reduced by a cardan joint. The cardan joint
is coupled to a speed converter that matches the tractor's speed to the speed
required for the three-phase generator.
The generator's voltage depends directly on the rotational speed:
The system for
regulating the tractor's speed shows a mild drop in speed between idle and operation under
load. Therefore the idle speed should be set 3
–4% higher than the rated speed. This means
the voltage should be 400
–410V, and the frequency 51 Hz. We recommend checking the
speed if any other voltage is produced.
Frequency monitoring
In idle, the frequency must be set to 51 Hz. Under load, this drops to about 49 Hz. The
tolerance is +/- 2.5 Hz.
The three-phase generator is self-exciting in that it uses residual magnetism and
regulates itself using a combined system (serial/parallel excitation). The control
system allows a precise voltage of ±5% to be achieved (when run up to speed, at
constant rpm and with balanced loads). The three-phase generator's output
connections have been set up as a star connection at the factory. This type of
EZG 24/2
EZG 33/4, EZG 46/4
