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The aim of this paper is the presentation of a method allowing the prediction, at the design phase, of the partial discharges Inception Voltage (PDIV) in motor coils made with classical enamelled wire. The method is based on the comparison of electrical potential values -obtain with a Finite elements simulation -with those given by the Paschen's laws for the same inter-electrode gap. The originality of the study is the consideration of the length of the electric field lines to compute the gap between the electrodes. With this prediction, it is possible to improve the capabilities of the Electrical Insulation System (EIS) of motor built in large series.

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This paper deals with a new AC electric motor magnetic circuit structure made of shifted non-segmented grain oriented steel laminations. The aim of the paper is to understand with a finite element approach the local distribution of the magnetic flux density inside shifted laminations as well as in the air-gaps between them. It is shown that the air-gap flux distribution is not trivial at all and very difficult to appreciate.

Determining the Partial Discharge Inception Voltage (PDIV) is a key point when designing electrical coils or busbars. In this paper, a method making it possible to calculate the PDIV as well as to locate partial discharges in windings of any shape is presented. It is based on a 2D finite element computation using both duali.e. scalar and vector potential -electrostatic formulations and a comparison of the obtained operating points with the Paschen's curve.Index Terms-Finite element method, field lines, partial discharge inception voltage.