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what is brushless generator.How does work it..??
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Answer Posted / kj
Normally brushes were used with a commutator with
generators with a rotaring field or sliprings for
stationary field.
As the brushes always would require servicing generator
manufacturers found ways to eliminate them. To do this they
used 2 generators on the same shaft. A small one (exciter)
with a stationary field to produce a 3 phase supply on the
rotor. The output from this generator is rectified with the
rotating diodes and feed into the main rotor. This is a
rotating field generator.
The voltage is controlled by controlling the field of the
small exciter generator. A second benefit is that the field
current is reduced from anywhere between 25 to 100 amps to
only 2 to 10 amps. This makes the control of the field much
easier and cheaper.
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