Abstract: A method for inserting a rotor including the step of centering and guiding a first end portion of the rotor by a first guide tool having an inclined face which is in turn attached to the first end portion of the stator cooperating with a second guide tool attached to a rear end portion of the rotor shaft during initial insertion of the rotor into the stator. The rotor has a magnet which is easily chipped and is arranged on a peripheral face of the rotor. The method further includes the step of guiding a second end portion of the rotor within the stator by guiding a front end portion of a rotor shaft by a front bearing attached to the second end portion of the stator, and by guiding a rear end portion of the rotor shaft by the first guide tool attached to the first end portion of the stator cooperating with the second guide tool attached to a rear end portion of the rotor shaft.

Abstract: A permanent-magnet field synchronous motor comprises a rotor body (22) having a cylindrical outer surface. A plurality of permanent magnets (25) attached to the cylindrical outer surface of the rotor body and arranged in the circumferential direction thereof form a field system. Each of the permanent magnets has an outer surface (25b) which extends circumferentially in parallel to the cylindrical outer surface of the rotor body and also has a constant thickness in the whole thereof. The inner surface and the outer surface of each of the permanent magnets has a certain configuration, respectively, each of which is composed of a plurality of straight lines and approximates to a contour line consisting of half-sine curves (S.sub.1, S.sub.2) extending between the circumferential opposite ends of each of the permanent magnets when developed in a plane surface.