The considerable harmonic content and sharp commutation pulses occurring in the output wave shapes of modern adjustable speed drives adversely affect the life of the induction motor insulation. The thermal ageing is enhanced by the increased dielectric losses caused by the higher order harmonics, whereas the electrical strength of the material is decreased as a result of the more intense partial discharge (PD) activity. In order to understand the failure mechanisms and determine the life performances of several insulation systems adopted in medium voltage traction motors an experimental research has been carried out. In particular, two typical insulation systems based on impregnated polyimide (Kapton) have been subjected to non sinusoidal wave shapes with controlled characteristics. The effects of the applied voltage wave-shapes parameters such as the frequency, slew rate (dv/dt), and voltage peak value are analysed for different material thickness and impregnation resin adopted. The obtained results, by elucidating the factors influencing the insulation duration, provide a useful background for electrical design engineers involved in the development of new generation adjustable speed drives.
Insulation Systems for Inverter-Fed Traction Motors: A Comparison of the Behaviour of Different Polyimide-Based Composites / Petrarca, Carlo; L., Egiziano; V., Tucci; M., Vitelli; G., Pizzella; A., Masucci. - STAMPA. - (1999), pp. 487-1-487-7. (Intervento presentato al convegno European Conference on Power Electronics and Applications (EPE ’99) tenutosi a Lausanne, Svizzera nel Giugno 1999).
Insulation Systems for Inverter-Fed Traction Motors: A Comparison of the Behaviour of Different Polyimide-Based Composites
PETRARCA, CARLO;
1999
Abstract
The considerable harmonic content and sharp commutation pulses occurring in the output wave shapes of modern adjustable speed drives adversely affect the life of the induction motor insulation. The thermal ageing is enhanced by the increased dielectric losses caused by the higher order harmonics, whereas the electrical strength of the material is decreased as a result of the more intense partial discharge (PD) activity. In order to understand the failure mechanisms and determine the life performances of several insulation systems adopted in medium voltage traction motors an experimental research has been carried out. In particular, two typical insulation systems based on impregnated polyimide (Kapton) have been subjected to non sinusoidal wave shapes with controlled characteristics. The effects of the applied voltage wave-shapes parameters such as the frequency, slew rate (dv/dt), and voltage peak value are analysed for different material thickness and impregnation resin adopted. The obtained results, by elucidating the factors influencing the insulation duration, provide a useful background for electrical design engineers involved in the development of new generation adjustable speed drives.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
