We have adapted a 60W A/C Fan Motor, 1500 RPM to run two spindles one at 6000 RPM and the other at 500 RPM using pulley & belt. On continuous use the motor heats up excessively and a few fail. Load is winding of threads from a Cone to a bobbin. I need a few suggestion i) Can rewinding the failed motors with a higher gauge copper wire solve the problem. ii) How do you determine the load and create specification so that I can buy an appropriate motor capable of handling the load.