Original poster: "Michael by way of Terry Fritz <twftesla-at-qwest-dot-net>" <MFraylich-at-btinternet-dot-com> Dear Tesla, what is the difference between sync and async? Is async a DC motor that is run from the mains? Why not just use a normal AC motor that spins at 3000RPM and triggered by the peak voltages of the caps or by an obit or autocoil? Michael