Dynamoelectric machine with distribution of the winding coils for minimizing voltage stresses and method of locating coil locations therefore

Abstract

A method and apparatus for selecting one of a plurality of available winding configurations for a multi-phase motor is disclosed. The winding includes separate phase windings, each of which consist of a plurality of series-connected coils distributed throughout stator core slots and having overlapping end turns and/or having shared slots containing coil sides of different coils. For each configuration, a value is assigned to each coil based on its potential with respect to the applied AC voltage. A logic table of the relative voltage potential values within the end turns and shared slots is created for all phases. The interface voltage for the overlapping end turns and/or shared slots is determined for each coil side in relation to all other coils of the same phase and the other phases for establishing a record and table of the voltage stress values throughout all interfaces in the end-turns and/or slots. A map of such interface end turn and/or shared slot voltage potentials provides a map of the voltage stresses and the distribution of the voltage stresses within the winding. The best configuration can be selected applying predetermined voltage stress criteria. The analysis and selection can be carried out manually or with suitable logic apparatus. A computerized system is disclosed.