an arm portion which is integrally provided at a distal end of the winding portion, said arm portion extending in a direction nearly perpendicular to the winding portion and having a coupling portion at one end, a remaining portion of each arm portion which excludes the associated coupling portion being located further apart from a proximal end of the associated winding portion than the associated coupling portion; forming a plurality of laminated bodies by stacking the first teeth and the second teeth in such a way that the coupling portions of the first teeth and the coupling portions of the second teeth in each laminated body face in opposite directions; forming a coupled body comprised of a plurality of laminated bodies by coupling the coupling portions of thefirst teeth in one of adjoining two laminated bodies to the coupling portions of the second teeth in the other one of the adjoining two laminated bodies in a rotatable manner, the laminated bodies being laid out in a line in such a way that the winding portions in each laminated body become nearly parallel to the winding portions in another laminated body; winding a winding on the winding 10 portions in each laminated body; and rotating adjoining two laminated bodies in such a way that the coupled body forms a ring-like shape and the winding portions are arranged radially.
Other aspects and advantages of the invention will become apparent from the following description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of