Stamped sheet metal frame for dynamoelectric machine

Abstract

A dynamoelectric machine is provided with a frame structure consisting of at least two fabricated sheet metal pieces of identical shape and size. The sheet metal members are formed to provide cavities to accommodate an armature structure and bearings, and the opposed sheet metal pieces enclose and support the armature and bearing when fixed together. The sheet metal pieces also support preferably a ceramic magnet field by providing formed bosses and tabs for locating and holding the magnets in position. If additional low reluctance flux path is required, a tubular jacket may be placed over the sheet metal housing. The bearings are preferably spherical bearings, and the invention contemplates providing the sheet metal pieces with formed bearing retaining areas and having grooves to retain a fibrous lubricant containing material formed either in the retaining areas or the bearings or both. The brush holders are preferably resinous material molded to provide vanes on sides of the holders to push aside opposed tabs which then engage the vanes and hold the brush holder in place. Brushes fit through passages in the holders of conforming shape and size. An L-shaped terminal fits into a slot parallel to the passage and is latched in place with one leg overlying the opening and holding the end of a spring which engages and urges the brush into contact with the commutator, thereby providing electrical contact.