+1 to what Jazz has just said. You've made a mistake.

If the motor has got two wires then it's most likely a DC-motor, so 1830's technology... noisy, brushes that'll wear out and low efficiency (hence heat and potentially low duty cycle). It's also likely to have poorer quality bearings - might not even be angular contact, so the stiffness will be lower and who knows how long it will last.