Jacketed rotary machine

A rotary machine comprising a stator with coils retained in notches by shims and a leakproof jacket located in the stator bore wherein the shims for retaining the coils are fixed in the notch and do not close the notch and such that a passage is formed between said retaining shims and the notch end leading into the bore and wherein the machine further comprises notch closing shims of a predetermined height positioned within said passage independent of said coils and protruding from said bore to avoid direct contact between the jacket and the bore, and elastic means provided in said passage between said retaining and notch closing shims for retaining the coils and said notch closing shims, said notch closing shims exerting a pressure on the jacket and in cooperation with said elastic means providing an elastic support for the jacket, in order to compensate for any possible dilatation deviations.