AC Motors

New Surplus and Reconditioned Electric Motors and Equipment

AC motors are the most common type of electric motor. 1 Phase motors are used in residential and light commercial applications. 3 Phase motors are used in commercial and industrial applications.

Romanoff Industries sells AC Electric Motors from all major manufacturers:

ABB Electric Motors, Allis Chalmers Electric Motors, AO Smith Electric Motors, Asea Electric Motors, Baldor Electric Motors, Baldor/Reliance Electric Motors, Brook Electric Motors, Brook Crompton Electric Motors, Brook Hansen Electric Motors, BBC Electric Motors, Century Electric Motors, Elektrim Electric Motors, General Electric Motors, Hico Electric Motors, Howell Electric Motors, Hyundai Electric Motors, Leeson Electric Motors, Louis-Allis Electric Motors, Magnetek Electric Motors, Marathon Electric Motors, North American Electric Motors, Reliance Electric Motors, Siemens Electric Motors, Siemens-Allis Electric Motors, Tatung Electric Motors, Teco Electric Motors, Teco/Westinghouse Electric Motors, Toshiba Electric Motors, US Electric Motors, Weg Electric Motors, Westinghouse Electric Motors, Worldwide Electric Motors

AC motors are used to convert electrical power to mechanical power. Most machinery has an electric motor directly powering it or an electric motor running a hydraulic pump to create hydraulic pressure or an electric motor running an air compressor to create compressed air.

Common applications for electric motors include: Pumps, Fans, Compressors, Conveyors, Machine Tools, Steel Making Lines, Plastic Extruders, Rubber Mixers, Mixers, Paper Making Machinery, etc.

Common Voltage for AC Motors include 200 Volt, 208 Volt, 220 Volt, 230 Volt, 240 Volt, 440 Volt, 460 Volt, 480 Volt, 575 Volt, 2300 Volt, 4000 Volt, 4160 Volt, 6600 Volt, and 13,200 Volt.

When Voltage is applied to and electric motor, at the rated Hertz or Cycles, the motor runs at a fixed RPM or Revolutions per Minute. At 3 Phase, 60 Cycles, the common RPMs are: 3600 RPM (2 Pole), 1800 RPM (4 Pole), 1200 RPM (6 Pole), 900 RPM (8 Pole), 720 RPM (10 Pole), 600 RPM (12 Pole), 514 RPM (14 Pole), 450 RPM (16 Pole), 400 RPM (18 Pole), 360 RPM (20 Pole), 300 RPM (24 Pole), 257 RPM (28 Pole), 200 (36 Pole) RPM, and 180 RPM (40 Pole).

With the introduction of variable frequency drives, now the RPM of AC motors can be changed by altering the Cycles and Voltage applied to the motor.

AC Electric motors come in a variety of Enclosure Types. The enclosure of the motor determines how well the windings of the motor are protected from the environment the motor operates.

Romanoff Industries sells AC motors in the following enclosure types: Drip Proof (Open), TEFC (Totally Enclosed Fan Cooled), WPI (Weather Protected Type I), WPII (Weather Protected Type II), TEAO (Totally Enclosed Air Over), TEAAC (Totally Enclosed Air to Air Cooled or Tube Cooled), TEBC (Totally Enclosed Blower Cooled).

AC electric motors come with two different types of bearings. Ball Bearings (Anti-Friction) are usually lubricated with grease but in some cases they are lubricated with oil. Sleeve Bearings (Friction) are lubricated with Oil. Some motors in high thrust applications have a sleeve bearing in the drive end and a ball bearing in the opposite drive end.

AC electric motors have leads(wires) that power(voltage) is applied to. AC motors typically have 3, 6, 9, or 12 leads. 3 lead motors are only suitable for one voltage. 6 leads motors are either suitable for two different voltages or can be utilized with specific types of starters. A dual voltage motor has 6 leads numbered 1-6. A single voltage motor with leads numbered 1-6 can be started across the line or with a Wye - Delta Starter. A single voltage motor with leads numbered 1,2,3,7,8,9 can be started across the line or with a Part Winding Starter. A 12 lead motor with leads numbered 1-12 is either a dual voltage motor or a single voltage motor that can be used with a variety of starters. Motors that have leads with the same numbers Example: 1,1 2,2 3,3 are set up that way to reduce the size of the lead wire when the motor is being wound.