I've been planning on using a 3ph motor & VFD that I already have for my home lathe project. Problem is, I thought my VFD will accept 220V single phase; it will accept single phase, but minimum of 380VAC. So I need a big costly transformer after all. So I thought why not use a big universal motor? I think I can probably put an encoder on it, and design a phase angle firing power control circuit that will read the speed of the motor and adjust the applied power to maintain constant speed with varying load.
I'm blanking on ideas where to get a large universal motor. I don't want to buy something brand new; I'm thinking what kind of machine uses one I could get for scrap price. A washing machine comes to mind, but I'm not sure if that's big enough. Anybody know generally what HP a washing machine motor is? I'm not sure how much HP I'll need, but I'm assuming (conjecture) that 3HP is about the smallest motor I could get away with. The lathe chuck + shaft weighs about 75lbs and needs to spin at least 500 rpm I think, plus I'll be adding additional rotating resistance later in the form of gears and a lead screw.
Or if you have any other ideas (other than universal motor) I'm all ears.
I'm blanking on ideas where to get a large universal motor. I don't want to buy something brand new; I'm thinking what kind of machine uses one I could get for scrap price. A washing machine comes to mind, but I'm not sure if that's big enough. Anybody know generally what HP a washing machine motor is? I'm not sure how much HP I'll need, but I'm assuming (conjecture) that 3HP is about the smallest motor I could get away with. The lathe chuck + shaft weighs about 75lbs and needs to spin at least 500 rpm I think, plus I'll be adding additional rotating resistance later in the form of gears and a lead screw.
Or if you have any other ideas (other than universal motor) I'm all ears.