A direct drive wind turbine operates with a rotor rotational speed of 19 RPM at full power output. Determine the number of magnetic poles required to match a grid frequency of 50 Hz.
What will be an ideal response?
Equation that relates generator rotational speed, frequency, and number of magnetic poles is; RPM = 120(ƒ Hz)/ Number of magnetic poles
Number of magnetic poles = 120(ƒ Hz)/ RPM; filling in the known values yields
Number of magnetic poles = 120 (50 Hz)/19 RPM = 316 poles.
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