AC MOTORSOMAT Series of general purpose AC motors are industrial-duty, three-phase, 208-230/460 V motors available in 0.33 to 2 hp and a speed of 1800 rpm. Suited for the machine tooling industries, these totally-enclosed fan-cooled (TEFC) 56C frame motors are constructed of industrial-gauge rolled steel and feature class F insulation. They are inverter-capable with a 5:1 speed turndown for variable torque applications and a 2:1 speed turndown for constant torque use.