Abstract: Arcuate permanent magnets are inserted into the bore hole of a stator intended for use in an electric machine which is excited by permanent magnets. Spring elements, inserted into recesses in the wall of the bore between the magnets, have spring arms which are connected to each other via a back part and which rest against axially extending lateral edges of the permanent magnets. To insure retention of the permanent magnets against high mechanical shock stresses without connecting the spring elements to the stator, the spring elements are provided with extensions, formed on their back parts, which frictionally engage undercuts in the recesses. The spring arms themselves extend around the lateral edges of the permanent magnets in a form-locking manner.

Abstract: An electric machine without pole pieces excited by permanent magnets is disclosed in which the stator of the machine comprises a yoke frame of angular outside shape having an even number of corners which exceeds 2 and of circular inside shape. The yoke frame forms the magnetic return and arc-shaped permanent magnets corresponding to the inside shape of the yoke frame are fastened in the inside of the yoke frame with lateral spaces therebetween, the magnets being centrally disposed between respective corners of the frame.