SPINDLE MOTOR

摘要

PURPOSE: A spindle motor is provided to improve a moving characteristic of a motor by fixing a shaft to a housing and a cover and increasing a gap between grooves. CONSTITUTION: A stator(11) is fixed and installed to a housing(10). A lower portion of a vertical shaft(20) is fixed and installed to a center of the housing(10). A plate(21) is formed to the shaft(20). A groove(22) for generating a dynamic pressure is installed to an external peripheral surface of the plate(21) and an external peripheral surface of the shaft(20). A sleeve member(30) is supported to an external peripheral surface of a lower portion of the plate(21). A driving magnet(31) is attached to an inner peripheral surface of a lower portion of the plate(20). A bush member(40) is inserted into a upper portion of the shaft(20) in a upper portion of the sleeve member(30).