Multi-Speed motors are AC motors that can run at two or more speeds. The most common multi speed motor utilizes one winding that can be connected for two different speeds. The leads on one winding, two speed motors have 6 leads and are numbered 1-6. Multi-Speed motors can also have two separate windings. Multi-Speed motors with two windings have 6 leads and are numbered 1-3, 11-13. It is also possible to have Multi-Speed motors that operate at 3 or 4 speeds. Both require a two winding configuration.
Multi-Speed motors are commonly used in mixer, crane, and cooling tower pump applications. Multi-Speed motors are being obsoleted by variable frequency drives. Multi-Speed motors are made by most manufacturers including: Allis-Chalmers, Baldor Electric, General Electric, Lincoln Electric, Leeson Electric, Louis-Allis Electric, Marathon Electric, Reliance Electric, Siemens, Siemens-Allis, Teco/Westinghouse Electric, US Electric, and Westinghouse Electric.
At Romanoff Industries, we offer an extensive selection of multi speed electric motor options having HPs that range from 1.5 to 1500 and RPMs that range from 410 to 1800. These models handle maximum voltages of between 440 and 4000. The various conditions of the multi speed motors from our selection include used, surplus, and rebuilt. Our inventory of multi speed motors includes models with DPSB, TWECSB, WPIISB, WPIIBB, TEFCBB, DPBB, TEAOBB, and TENVBB enclosures.