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Reliance Electric Technologies, LLC

Jerry L Martin

William E Martin

Sidney Bell

Stephen T Evon

Barron D Grant

Grayson W Lambert, Jr

John M Zedek

This disclosure provides a consolidated electric motor stator lamination for multiple enclosure types such that a single stator assembly can be used for different classifications of an electric motor. Each layer of the stator lamination includes external features that, when combined with the external features of the other layers in the lamination, can be adapted to conform the electric motor to one of a plurality of enclosure types. The external features include retaining features for one or more covers, fins, and a profile configured to accept cooling tubes. In various embodiments, a single consolidated stator lamination assembly can be adapted to provide a motor having at least two of an open-drip proof (ODP), a totally enclosed fan cooled (TEFC), or a totally enclosed water cooled (TEWC) enclosure classification.

Consolidated stator laminations

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A technique for forming stator coils for an electric motor is disclosed. The technique includes forming D-shaped or generally trapezoidal coils having a closed loop defining a long side and a short side joined by end portions. The coils are installed in a stator core having a plurality of slots formed around its inner periphery. The long sides of the coils are disposed in a predetermined position within these slots, such as in a lower position, while the short sides are disposed in opposite positions, such as in upper positions. The long sides extend beyond the short sides at end regions of the stator core. The end portions of each coil wrap around the ends of the stator core and incline from the long side of the respective coil to the short side thereof. Crossing points are established between the long side of each coil and end portions of adjacent coils. The crossing points are located in predetermined positions and the coils may be taped to insulate the long sides from the end portions at the locations of the crossing points. The physical spacing of the end portions owing to the trapezoidal shape of the coils reduces potential difference gradients between the coils, reducing the risk of corona breakdown in inverter drive applications and the like.

Electric motor and electric motor stator and method for making same

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Gainesville, GA, United States of America

Jerry L Martin