Abstract: This disc rotor has a hat portion having a cylindrical portion and a sliding plate portion having an insertion hole into which the cylindrical portion is inserted, being connected together with the hat portion in a state in which the cylindrical portion protrudes from the insertion hole. The coupling is achieved by pinching an inner peripheral edge of the sliding plate portion between a first portion and a second portion that are formed in the cylindrical portion. The second portion is formed by plastically deforming an outer peripheral side of the cylindrical portion toward the first portion.

Abstract: This disc rotor has a hat portion having a cylindrical portion and a sliding plate portion having an insertion hole into which the cylindrical portion is inserted, being connected together with the hat portion in a state in which the cylindrical portion protrudes from the insertion hole. The coupling is achieved by pinching an inner peripheral edge of the sliding plate portion between a first portion and a second portion that are formed in the cylindrical portion. The second portion is formed by plastically deforming an outer peripheral side of the cylindrical portion toward the first portion.

Abstract: A miniature electric motor including a shaft, at least one rotor coaxially mounted on the shaft and having a plurality of pole teeth angularly spaced from each other, at least one permanent magnet stator magnetized to provide north and south poles alternating at angular spacings corresponding to the angular spacings of the pole teeth, at least one annular exciting coil, and a yoke member made of magnetic material. The yoke member, exciting coil and stator are positioned relative to the rotor so that a magnetic flux developed by the exciting coil combines with the pole teeth of the rotor to form a magnetic loop. The motor further includes a motion translating mechanism located between the rotor and the shaft for converting the rotation of the rotor into a linear movement of the shaft.