A motor includes a rotor case having a rotor magnet so as to face a stator core; a rotating shaft as fixed through a hole formed in the center of the rotor case; and a pulley having a center hole fixedly secured to a distal end portion of the rotating shaft projecting beyond the hole in the rotor case, the pulley being fixed to the rotor case.

The electrical characteristics of a centrosymmetrical-shaded pole motor having salient poles and concentrated windings are improved by shaping the poles of the motor so that the angle enclosed between the pole axis and the neutral axis on the shaded pole side of the pole axis is less than that on the main pole side, the shaded pole arc is at most equal to one-fifth of the pole pitch, and the airgap adjacent to the pole has a nonuniform configuration such that the harmonics of the excitation fiel...

A motor comprises a stator, a rotor being arranged in and facing said stator, an urging member which urges a center rotation shaft of the rotor in an axial direction, and a bearing which rotatably holds the rotor at a predetermined position while receiving an urging force by the urging member. The stator is provided with a resin coil bobbin made by insert molding and integratedly assembled with a metal stator core. The stator core is arranged in and faces the rotor and forms a magnetic circuit t...

The present invention aims at providing a motor which can stably be mounted on a circuit board when being assembled into an instrument in particular. The motor 1 in accordance with the present invention comprises a motor body A, an output shaft 3 projecting from a front end of the motor body A, and a voltage-supplying terminal 8 provided in the motor body A, the terminal 8 having an elastic force in a direction substantially orthogonal to the output shaft 3 and also having a grounding portion 14...

A cup ring and a holding-plate are disposed at each side of a front bracket of a stator of a motor, to fix in place an outer ring of a front ball-bearing of the rotor of the motor in order to prevent creep between a bearing housing and the outer ring. A thickness of a bearing shim is adjusted such that a distance between an end portion of a tube section of the cup ring and a first end face of the outer ring is less than 0.1 mm. The holding plate is temporarily fixed to a given place of the motor...

A motor that can prevent damages on the fluid dynamic bearing. A ball is press-fitted into the end surface of the shaft body, and the ball is disposed in such a manner that the tip portion of the ball comes to the higher position with respect to the end surface of the annular body. When the shaft is at rest, the ball abuts against the upper surface of the counter plate, and the end surface of the annular body is brought into a state of being raised from the upper surface of the counter plate, so...

A motor includes a commutator, which has twenty-four segments. Each of eight short-circuit members is connected to three of the segments. Each short-circuit member extends in an arcuate form in an angular range corresponding to arranging positions of three segments to be connected to the short-circuit member. The eight short-circuit members are laminated to form a multiple-layer structure in the axial direction of the commutator. The short-circuit members form a substantially cylindrical laminat...

In a small-sized motor used for lens drive, to provide the motor which is easy to attach to another member and gives space saving. Further, to provide a motor in which the number of parts is reduced thereby to improve assembly efficiency and make shaft accuracy good. Stator cores constituting a stator opposed to a rotor, an output portion side bearing that rotates and supports a side, near an output portion for operating an operated member, of a rotary shaft inserted and fixed into the rotor, an...

In a motor having a spindle (5) on which an inner race (8) of a ball bearing is mounted, an outer peripheral surface of an end of the spindle (5) has a knurled portion (16) on which is mounted the inner race (8) which is fixed to the spindle (5) through an adhesive (18) filled in a clearance between an inner surface of the inner race (8) and the knurled portion (16). An annular groove (19), formed in the spindle (5) in an area adjacent to the knurled portion (16), is also filled with the adhesiv...

A motor includes two reciprocating electromagnets. The magnets are energized at positions when the total repulsive forces of the electromagnets can be applied to a single crankshaft. The electromagnets are energized when the crankshaft is 90.degree. past top dead center, in a position to provide maximum torque. One of the electromagnets is positioned by a groove follower which rides in a cam groove cut in a face of a camshaft. The camshaft is connected by a connecting linkage to the crankshaft t...