Abstract: In order to provide a vibration motor which can make a starting force strong with maintaining saving electric power and increase a vibration force, in the vibration motor, a facing gap between a central salient pole and a pair of auxiliary salient poles are shifted and arranged around a rotating shaft with non-centrosymmetry and a facing gap between the central salient pole and the field magnet is formed narrower than facing magnets between the auxiliary salient poles and the field magnet. Further, an exciting force of the central salient pole is greater than that of the auxiliary salient poles and in starting, the same magnetic pole as the magnetic pole of the field magnet generates in a facing surface of the central salient pole and a repulsive force occurs so that the armature core is urged to rotate.

Abstract: A cup-shaped winding for use in the rotor or stator of a motor such as a coreless motor or slotless motor makes use of leakage flux as well as magnetic flux in the main direction. The cup-shaped winding consists of wire bands which are lap wound such that they are successively shifted a given angle from one another about the rotating shaft of a core. The winding is shaped into a cylinder or cone. The portion of each wire band which is on the bottom of the cylinder or cone does not surround the rotating shaft and forms two sides that meet at a vertex lying on the periphery of the rotating shaft. The portion of each wire band which is on the curved surface of the cylinder or cone are inclined away from the rotating shaft.

Abstract: A coil element of the invention is formed by a flat ring-shaped original winding. Reference lines which pass the central point form angles .alpha. and .beta.. Points at intersections of the periphery of the flat ring-shaped original winding and the reference lines are thus determined. Bending lines which extend from the points and which form an angle .phi. with the reference lines are determined. The flat ring-shaped original winding is divided into first and second coil segments. The first coil segment is bent along the bending lines and pressed on part of the second coil segment to manufacture the coil element.

Abstract: An electric motor coil element embodying this invention is manufactured by the steps of closely winding a single wire about a columnar bobbin to provide a cylindrical original winding having a diameter d, setting a 2n number of equal division points on the periphery of said cylindrical original winding to divide said periphery into equal parts, specifying the bending lines which pass through the equal division points at prescribed angles .phi..sub.1 and .phi..sub.2 to the reference lines which are set in parallel with the axis of said cylindrical original winding and pass through said equal division points, and bending the segments of said original cylindrical winding is such a manner that said bending lines project alternately inward and outward along the periphery of an imaginary block form having a prescribed shape.