Motor speed (RPM) is dependent upon the speed (frequency) of the rotating magnetic field.
Dean Of course you are right...but what control the frequency of the rotating field?.. these water pump direct hooked up to the solar panel operate from zero to full flow depending on the amount of sun. They have to be running at different speed to do this, therefor the controller must be putting out 3 phase at varying speed. depend on what? I don't think that they could be "slipping " that much in speed. The pumps seem to run as fast as they can with what is wired to them. I see one pump listed it's GPM at 24 volt and half that flow at 12 volts.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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