Generator Turbine
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Wind Power: Why doesn't a wind turbine with a synchronous generator need a gearbox?
As I understand it a wind turbine using a synchronous generator doesn't need a gearbox since the problem with slow rotation at low wind speed is solved. But how does the synchronous generator solve it?
it could have a variable load/resistance circuit which optimises the blade speed to produce an averaged electricity output.In effect a single variable (electronically assited) gear.With data from the proposed site of the windmill and a good circuit design it can be very effecient,but has to be a 'one off' really.
By using a gearbox the turbine can have a better power /speed ratio ,enabling more efficiency at low wind speeds and more stable running at higher windspeeds .
By using an electro magnet in the generator windings ,rather than a fixed ferrite magnet ,the force of the 'generator coil' can be varied electronically ,i.e. when windspeed is low the electronics reduces the power to the generator feild windings(in effect an electro magnet) to decrease the mechanical resisitance and therfore keep the blade speed higher.As the blades spin faster the electronics allow more electricity to the feild windings to produce a stronger magnet (i.e. more power) but it can also use the electro magnetic effect of the coil windings as an electronic 'brake'
I would assume that having a completly electronic system (other than voltage/current regulator)on a small wind generator would be a waste of money .
Smaller wind turbines usually mean higher rotor/bearing speeds and therfore more maintenance
