| 摘要 |
A shallow cup-shaped miniature motor having a motor case of a substantially shallow cup shape, fitted with a permanent magnet field; a motor case cover engaged with the open end face of the motor case; a rotor having a motor rotating shaft rotatably supported by a first bearing provided on the closed end face of the motor case and a second bearing provided on the motor case cover; brushes supported by the motor case cover for making sliding contact with commutator segments provided on the motor rotating shaft, in which an insulating core having wing portions substantially covering a laminated core comprising the rotor is provided on the outermost end face of the laminated core; the insulating core having at the center thereof a through hole through which the motor rotating shaft is passed, and a hollow cylindrical portion, provided around the through hole, having a plurality of notches for engaging with a plurality of the rising portions of the commutator segments; a commutator surface comprising the commutator segments is formed on the motor rotating shaft on the inside surface of the hollow cylindrical portion, rotor windings are wound on the laminated core covered with the wing portions of the insulating core while being supported by the outer circumferential surface of the hollow cylindrical portion of the insulating core, and the brushes make sliding contact with the commutator surface formed on the inside surface of the hollow cylindrical portion of the insulating core.
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