Abstract: A d.c. electric motor wherein the permanent magnets are kept in place by elastic fastening means carrying out an active magnetic function. The fastening means preferably includes yoke sectors each formed by two or more superimposed sheet members having angular extensions progressively decreasing. The motor further includes an anti-inductive frame formed by at least two equally spaced apart longitudinal portions and by one or more transverse portions forming an open or closed path respectively of material that is electrically conductive but not ferromagnetic. The frame further provides a housing for a temperature sensor in a recess and an insulating tubular envelope.