Abstract: The present invention provides a motor having an urging member for urging a rotor disposed oppositely to a stator in the axial direction, in which the rotor is rotated in a state under an urging force of the urging member, characterized in that a positional regulation part (bearing) for regulating the position of the rotor in a thrust direction under the urging force is integrally provided in a coil bobbin made of resin which has metallic stator cores making up the stator formed by insert molding. Therefore, the positional accuracy of the positional regulation part (bearing) with respect to the stator is made better. Thereby, the positional accuracy of the rotor with respect to the stator is also improved, so that the torque up is enabled.

Abstract: The stator assembly of a PM stepping motor having a two-phase structure in which two stators arranged along the circumferential direction in such a manner that respective pole teeth are intermeshed together are combined back to back so as to phase-shift the respective pole teeth in the two stators at an electrical angle of 90°. The field rotor magnet is so arranged as to face the respective pole teeth at a small distance, and is magnetized on its circumferential surface along the circumferential direction with a plurality of alternating N- and S-poles having a preset width not matching the pole tooth pitch of each stator.

Abstract: A spindle motor having a pivot which tip portion can easily be formed by a spherical surface having high precision, high hardness, the diameter of which can be determined as desired, the tip portion 6a of the pivot 6 is formed by cutting a steel ball used in a bearing or the like having any diameter. The pivot 6 having a spherical surface 6a is formed by fixing the pivot tip portion 6a to one side surface 6c of a substantially cylindrical shaft portion 6b. As a result, the spherical surface having a high precision, high hardness which diameter can be determined as desired can easily be formed at the tip portion 6a of the pivot 6.

Abstract: A stator structure of a reciprocating motor is provided. In the stator structure of a reciprocating motor, a bobbin around a coil is wound; a plurality of unit stacked core members of a predetermined thickness, each of which is formed by stacking a plurality of lamination sheets formed of predetermined shaped thin plates, and radially positioned on the outer circumference of the bobbin; and an injection insulator combining the plurality of unit stacked bobbins to an outer circumference of the bobbin. Accordingly, it is possible to reduce the number of parts that form the stator and to simplify the structure of the stator. Therefore, it is possible to reduce the time required for assembling the parts and reduce the processes of assembling the parts, to thus improve assembly productivity.

Abstract: A ferrofluidic electromagnetic power generator installed within a rotating object, such as the interior of a vehicular tire generates electric current in an electrical coil wound about an elongated, hermetically sealed housing made of non-magnetic material, partially filled with magnetized ferrofluid. A permanent magnet and two magnetic pole pieces enclosing the housing and the coil in conjunction with the ferrofluid form a magnetic circuit. Rotation and horizontal velocity of the tire will propel the magnetized ferrofluid within the sealed housing causing induction in the electrical coil.