A general model to compute the electric flux lines in the slots of electric machines for the evaluation of partial discharge risk

Philippe Collin (1) , David Malec (2) , Yvan Lefèvre (3)

1 LAPLACE - LAboratoire PLasma et Conversion d'Energie
2 LAPLACE-MDCE - Matériaux Diélectriques dans la Conversion d’Energie
3 LAPLACE-GREM3 - Groupe de Recherches en Electrodynamique

Nowadays, on board electric machines of higher specific power powered by faster inverters represent a real challenge in designing the electrical insulation system (EIS). The electric stress on the stator winding is increased and thus partial discharges (PD) are more likely to appear. The Paschen's criterion is widely used to evaluate the PD risk. This paper presents a general method to compute the electric flux lines in the slots of electrical machines. A 2D model of an electric machine slot is solved in term of electric scalar potential. Then, from the nodal scalar potential solution, electric flux lines are located inside the slots. Consequently, the Paschen's criterion is applied by taking into account the real flux lines length. Some applications are presented to highlight the usefulness of the method to solve industrial problems.

Mots clés: Index Terms-partial discharges; dielectric constant; electric motor; numerical model; Index Terms-partial discharges

Domaines: Energie électrique

Philippe Collin, David Malec, Yvan Lefèvre. A general model to compute the electric flux lines in the slots of electric machines for the evaluation of partial discharge risk. COMPUMAG, Jun 2019, Paris, France. ⟨hal-02330891⟩