Callipygous Posted October 26, 2019 Share Posted October 26, 2019 I have come to accept that when an induction motor receives lower voltage than it was designed for it will pull higher current. This doesn't make any sense to me, but I have seen it stated enough times that I'm willing to believe it. Everywhere I look provides total nonsense explanations. They say things like "the motor will draw more current in an attempt to maintain its torque" as though the motor has agency and chooses how much current it draws, or "in order to provide the same power" as though the motor cares how much power it provides. The version that would make sense to me is you have a resistance, both in the actual windings, and in magnetic impedance(?), and if you apply a lower voltage Ohm's law means that it draws a lower current. If that results in a lower power output... what does the physics of the situation care about that? It seems like it should just spin slower, or not be able to move as heavy of a load. I always thought of wattage as a rated upper limit for a motor, not a target it actively tries to hit. Can someone help me out with a proper explanation of what force is at play here that causes the amperage to increase? Link to comment Share on other sites More sharing options...
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