Double fed Induction Generators

[Marke]

Double fed induction generators can be used to generate a fixed frequency with a variable shaft speed by driving the rotor with a variable frequency.
What are the limits for the mechanical speed range over which this type of generator can be used? most wind powered units that I have sen still use a gear box to step the speed up before driving the double fed induction generator.

Best regards,
Mark.

Mark Empson
L M Photonics Ltd

 

[edison123]

The main reason for stepping the speed is to reduce the size and cost of generators.

Muthu

http://www.edison.co.in