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Aug 18,  · The required engine size is dependent on the amount of power that the generator will need to supply. A good rule of thumb for a useful, compact generator is to choose an engine in the range of 5 to 10 horsepower. When a conductive metal passes through the magnetic field you create with the magnets, a current is produced in the metal that.

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GreenSpur Wind designs 15MW offshore turbine generator without rare earth magnets. UK electromagnetic engineering firm GreenSpur Wind has designed a 15MW offshore wind turbine generator using iron nitride instead of the rare earth elements typically used by the industry.