Asynchronous electric machine and rotor and stator for use in association therewith

Abstract

The invention relates to an asynchronous electric machine, wherein a rotor rotating relative to a stator is provided with an electrically conductible coating. An air gap (.delta.) between the rotor and the stator is designed according to the following formula ##EQU1## in which D.sub.r =outer rotor diameter (mm), D.sub.s =inner stator diameter (mm), u=peripheral speed (m/s), .delta.=air gap (mm), A=a constant, whose magnitude .gtoreq.0.3, preferably 0.7-1.5, suitably 1, B=a constant, whose magnitude .ltoreq.150, preferably 50-100, suitably 70, C=a constant whose magnitude .ltoreq.1200, preferably 300-600, suitably 400; quality m/s/.sub.mm The peripheral speed of the rotor is more than 100 m/s. Furthermore, the rotor is provided on its shaft body with an electrically conductible coating, which is designed to be continuous and to extend over the entire operative surface area of the rotor.

Dependencies are inferred from the claim text.