Wind turbine AC generator motor: brushless, 6000W, 3 phase
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I am trying to use a DC motor as a generator for a wind turbine but then there are two possibilities for the DC motor which are brushed and brushless. Which one is more efficient to use?
I know that if I use a brushless motor then I need to use a 3 phase rectifier which includes 6 diodes. Will the voltage drop in these 6 diodes affect efficiency? But if I use the brushed motor then I don't need to use the rectifier. Can this be the advantage over the brushless motor?
Answer:
A brushed motor has the rectifier built in via the commutator. So you don't need the 3 phase rectifier. However, the brushes and commutator contacts do wear out and the brushes need to be replaced from time to time. There are still losses associated with the commutator, even though not as much as with a diode bridge. In a wind turbine I would think that maintenance could be painful so you would want to minimize it as much as possible.
The brushless motor is typically much more reliable and doesn't require periodic replacement of anything. Depending on the output voltage (Speed and back EMF constant) the rectifier losses could be significant. You could use a 3 phase FET bridge instead of a diode rectifier, but that becomes much more complicated.
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