Alternating Current and Three-phase Motors
The history of AC motors really begins with Tesla’s patented design of 1888, which outlined the basic concept of the poly-phase induction motor – an innovation which soon became a mainstay of industrial applications. Today’s three-phase induction motors are designed to operate via a three phase AC supply and, most commonly featuring a squirrel-cage-type rotor assembly to reduce rotor-locking tendencies, bring considerable advantages thanks to their uncomplicated layout and ultra-durable construction. A self-starting variant, three-phase AC motors have proved an extremely reliable and economic low-maintenance option which delivers a highly efficient performance and transmits maximum power through to the output shaft. With products and accessories from major-brand manufacturers such as Oriental Motor, Saia, Siemens and Cliff, most requests for alternating current and three-phase motors can be promptly accommodated. Shaft outputs stocked range from 6 to 120 watts, with torque ratings of between 1.5 Ncm and 19.4 Nm, and a range of synchronous motors for dependable precision as well as DC motors without mechanical brushes for commutation. Units with speed-regulating tachometers can be supplied alongside a range of intermediate gears for IK and ES drives to step down power outputs, and to meet the exacting demands of varied climate conditions, some specifications can cope with an operational temperature range from -20°C through to +80 °C.