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Re: Controlling load of the generator
Any electrical engineers out there?
I just want to know if I am thinking right. As I think that permanent magnet alternator running at high rpm would induce high voltage. (Induced voltage is proportional to the speed that magnetic flux changes. )
Loses are mainly heat which rises with square of a current running trough the windings. So at high voltage and low current, loses would be smaller compared to power produced.
Although it would be a waste of a big alternator, running it at high speed and low power would be energy efficient. I think.
To be more specific, I recently saw an alternator which can produce 1900W at 425V at 500rpm. I digged its efficiency at 85%. So its internal resistance is probably about 17 Ohms. If I would set the current so that it would produce only 500W at the same voltage and speed, the efficiency would be about 95%. But I am not sure how much of that 15% original losses come from bearings.
Anyone care to comment?
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