SIC 7694 Armature Rewinding Shops

SIC 7694

This category covers businesses that primarily rewind armatures and rebuild or repair electric motors. These companies may either repair customers' equipment, and they also repair or rebuild motors for sale or exchange.

NAICS CODE(S)

811310

Commercial and Industrial Machinery and Equipment (Except Automotive and Electronic) Repair and Maintenance

335312

Motor and Generator Manufacturing

A generator, or dynamo, converts mechanical energy into electrical energy by rotating an armature through a magnetic field. Most electricity used in cars, homes, and industry is created by generators. The armature, which is usually made of copper wire wound around a laminated core of soft iron, is the rotating or stationary assembly in the generator, and is the main current-carrying conductor. A steel shaft is fitted through the center of the core to which the two ends of the copper wire connect.

Companies in the armature rewinding business rewind damaged coils or stators, fix hermetic seals on electric motors, and generally restore electric motors and components. They fix everything from small automotive generators to giant industrial and utility devices. Typically, firms in the industry operate a core facility with specialized equipment for coil manufacturing and rewinding, and usually have a machine shop, pre-assembly facilities, and assembly-testing facilities as well. They typically offer field service for analysis and testing and operate a sales unit for selling and distributing stock of manufactured and refurbished motors, from starters, alternators, and generators for industrial, automotive, farm, and marine use, to lawnmowers and other products using electric motors and drives.

Some of the larger and established companies in the industry, like Warwood Armature Repair Company, of Wheeling, West Virginia, and American Generator & Armature, of Lincolnwood, Illinois, had sales in the $5 million to $7.5 million range. Around 2,000 firms operated in the industry in the early 2000s in this $3 billion industry. Other leading firms included American Armature Products, of Davenport, Iowa; Armature Rewind & Rebuild, of Bay City Michigan; Central Armature Works, located in Washington, D.C.; San Antonio Armature Works, of San Antonio, Texas; and Tri-State Armature & Electrical Works, of Memphis, Tennessee.

Many other firms provide armature rewinding services as a smaller part of operations. Tampa Armature Works...