Hi Dr,
If this is Some Years Old and single-phase (i.e 110 / 220 volt), it might be worth swapping the motor capacitor/s before shelling out on a new motor - getting hot, lacking torque, poor starting too?
The cap/s will be tin can shaped, probably under a cover or clamped on the outside of the motor, should be marked with the capacitance and voltage. Your nearest motor shop is likely to stock them for a few Local Currency Units each.
Also, making an assumption, it may have a centrifugal switch for the start capacitor and it may be stuck - you should hear a clunk as it slows after switchoff if it has one, they soimetimes stick for no readily apparent reason!
Just my ha'pennorth,
Dave H.