Abstract: The present invention is used with a stopper mechanism for mechanically stopping the rotation of a motor. A pair of brushes is disposed such that a line which passes through the center of a rotor and connects the centers of the paired brushes is offset by a predetermined angle from a line which connects the centers of paired magnets. A commutator is disposed in such a manner as to be offset from a reference position by the same angle as the predetermined angle by which the paired brushes are offset. The predetermined angle falls within a range between an angle obtained by dividing 70° by the number of pairs of stator poles and an angle obtained by dividing 290° by the number of pairs of stator poles. Specifically, in the case of two stator poles, the predetermined angle falls within a range of 70° to 290° inclusive. In the case of four stator poles, the predetermined angle falls within a range of 35° to 145° inclusive.

Abstract: The present invention is used with a stopper mechanism for mechanically stopping the rotation of a motor. A pair of brushes is disposed such that a line which passes through the center of a rotor and connects the centers of the paired brushes is offset by a predetermined angle from a line which connects the centers of paired magnets. A commutator is disposed in such a manner as to be offset from a reference position by the same angle as the predetermined angle by which the paired brushes are offset. The predetermined angle falls within a range between an angle obtained by dividing 70° by the number of pairs of stator poles and an angle obtained by dividing 290° by the number of pairs of stator poles. Specifically, in the case of two stator poles, the predetermined angle falls within a range of 70° to 290° inclusive. In the case of four stator poles, the predetermined angle falls within a range of 35° to 145° inclusive.

Abstract: A miniature motor having a rotor arranged within a casing within which a stator is mounted, and a rotary shaft of the rotor is supported by bearing units mounted on both ends of the casing. One of the bearing units is provided with a thrust receiving member for supporting an end portion of the rotary shaft in a thrust direction, and a bearing for supporting the rotary shaft in a radial direction within a rotary shaft insertion hole. The thrust receiving member having a dimension that is equal to or smaller than an inner diameter of a bottomed recess formed in the casing is laid on a flat bottom surface of the bottomed recess. The bearing is securely fixed within the bottomed recess and contacted against the thrust receiving member. The rotary shaft insertion hole is in fluid communication with a through-hole formed in a bottom plate of the bottomed recess.