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AC motors
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slossmo says, "ive been it the indusrial electric motor repair business for 15 yrs...ac motors run at a constant speed depending on how they are manufactured...typically 900,1800, or 3600 rpm constant....." <br /> <br />That's not true, brushed AC motors have been used for years to power among other things sewing machines. I know that they will run from almost 0 rpm to well over 10,000 rpm depening on the voltage being sent by the footpedal which is just a big resistor. We also have frequency controlles on our three phase motors and they will run from near zero to max rating or anywhere between. What about ceiling fans, they have 3 speeds built in ususally and also can be speed up and slowed down with a motor "dimmer switch" . They are AC inductive motors. Todays state of the art locos use AC traction motors and they seem to be able to run different speeds without burning up. The only reason they used DC traction motors for years was know one could figure out how to make an AC controller big enough to control the current required to run 4000 hp locomotives. So what's the deal with your statement?
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