AC variable frequency drives that are used to control small and medium-sized motors in applications such as manufacturing processes, HVAC and pumps; Assembly lines, namely, a series of machines for assembling structural components of pumps, motors, valves, switches, sensors and electronic controls in successive stages; Drive system having two or more synchronous motors coupled through clutches to drive a common load; Hydraulic pumps and motors for hydrostatic systems, comprised of pumps, moto...