Reliance Electric Technologies, LLC

Craig W Luttrell

David M Byrd

A technique for making a stator for an electric motor or similar machine includes disposing a plurality of concentric coils in a stator core such that leads exit both ends of the stator core. The coils are disposed in accordance with a winding pattern that is particularly suited for making four-pole, three-phase machines. Certain of the coils are disposed singularly within core slots, while other coils share slots with coils of other winding groups. The coils may be inserted by machine, and in several layers by rotating the stator core between each layer insertion.

Method for making an electric motor stator

A winding pattern and technique for a stator of an electric motor is provided. The pattern is particularly well-suited for forming a four-pole, three-phase machine. The winding pattern permits concentric windings to be fully installed in slots of a stator core by machine in multiple steps. The concentric windings include windings which are singularly located within slots, and windings that share slots with other windings. The windings maybe inserted in the core slots by rotation of the core in an insertion station. Leads from the windings exit both ends of the core to facilitate channeling and termination of the windings.

Electric motor stator and motor incorporating same

A stator assembly for use in an electromechanical machine includes an improved concentric winding arrangement. Groups of concentric coils are alternately inserted from both ends of the stator core. In other words, a first phase group is inserted from one end. The stator core is then rotated 180&deg; for insertion of the second phase group. Next, the stator core is rotated back to its original position for insertion of the third phase group. The alternating process continues until all phase groups have been inserted. Preferably, the winding pattern utilizes a combination of full slots and shared slots, with full slots of different groups of the same phase being adjacent to one another. The invention permits the use of automated winding equipment in large inductions motors where hand insertion was often required in the past.

Electric motor stator assembly having novel winding arrangement and method of making same

Stator assembly for an electromechanical machine

A method of making an electromechanical machine stator assembly in provided in which concentric coil groups are alternately inserted from both ends of the stator core. A first phase group is inserted through a first axial end of the stator core. A second phase coil group is then inserted through an opposite end of the stator core, such as by rotation of the stator core 180 degrees. Additional coil groups are similarly inserted into the stator core to complete the stator. The alternating insertion process provided a winding configuration utilizing a combination of full and shared slots of the stator core with leads exiting from both ends. The method permits the use of automated winding equipment in large induction motors, and facilitates subsequent connection to the stator coil leads.

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Loganville, GA, United States of America

Craig W Luttrell