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Brushless alternators
Alternators with out brush

2006-11-11 01:58:21 · 1 answers · asked by UNNI VENUGOPAL 1 in Science & Mathematics Engineering

1 answers

A brushless alternator works very much like a regular alternator: a rotating magnetic field induces an AC in a stator field winding. Whereas in regular alternators the rotating magnetic field comes from permanent magnets or DC excitation carried to the rotor through slip rings and brushes, in brushless alternators the field excitation is coupled to the rotor by AC induction and then rectified. Voltage is regulated by adjusting the intensity of the rotor field. (Note that PM rotors can't be regulated this way.)
Ref. 1 below is another yahoo answer that describes the workings well. Unfortunately the link it refers to apparently no longer exists. The other refs. may be helpful. Ref. 3 descibes an experimental design that uses a synchronously rotating stator field, based on rotor position sensing, to excite the rotor field.

2006-11-12 09:09:21 · answer #1 · answered by kirchwey 7 · 0 0

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