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  1. PaulJohnson

    Help choosing a small 3 phase motor

    Hello Again ! I need to purchase a motor for a machine I'm building about 750w 1400rpm and I'm not sure whether to go for a single phase 240v or 3 phase. I don't have 3 phase supply so if i went that route then I'd be getting into a controller which I may need anyway for speed control.I'll be...
  2. PaulJohnson

    12v dc motor control-bi directional with PWM

    Hello I've just bought a small 12volt gear motor and it seems to work fine in either direction when I swap the wires over. I'd like to use one of the readily available speed controllers on EBAY but not sure whether these will work in both directions simply by changing the polarity?
  3. PaulJohnson

    Electric motor power and startup

    Hello I'm building a device for testing speed sensors and have until now been using a small bench grinder as the speed source which spins happily at a very stable 2950 rpm and is 150watt 240v. I then required higher speeds up to 5000rpm so made a pulley system with a separate shaft running in a...

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