MANUFACTURE OF STATOR BLOCK FOR CORELESS MOTOR

摘要

PURPOSE:To prevent a molding burr from projecting from the outer periphery of a magnet of semicylindrical shape for integrally molding in the cavity of a yoke by projecting an oblique piece from the peripheral edge of a resin flowing hole at the center of the bottom of the yoke. CONSTITUTION:A longitudinal groove 2 is fomred on the flat part of a magnet 1 forming substantially in a semicylindrical shape, and an oblique surface 2a is formed on one end of the groove 2. A yoke 3 is formed by throttling an iron plate and forming it in a one surface opened cylindrical shape. A resin flowing hole 3a is formed at the center of the bottom of the yoke 3. The outer periphery of the magnet 1 is intimately contacted with the inner surface of a molding die by the pressing force of the resin to be pressed to the inner surface of the groove 2, thereby preventing the molding burr from projecting from the outer periphery of the magnet 1.