My old belt/disc sander is giving up the ghost. It has a 1/2 hp motor and bogs down and stops turning with very little pressure on the belt. The majority of the new ones I see are only 1/3 hp but they have different types of motors. Cap start induction, single phase, etc. What type of motor is best for this kind of useage? There are bunch of them all in the same price range but the only real difference between them is the motor.