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Where did you find a .4 hp? The two treadmills I have had 1.25 and 2.0 HP permanent motors! The problem is, the controllers are SCR, not PWM - so you have to have AC for them to work; you can't use an SCR controller with a battery pack unless you invert to make AC, and then let the SCR convert it to DC.....which is stupid. So I'm not doing that.
If your project is staying near AC, then go for it. Unless you got lucky and got a PWM controller in your treadmill.
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