Motor adopting improved mechanism

A method of manufacturing a motor adopting an improved mechanism for driving a disc, the motor comprising:

• a stator having a shaft;
• and
• a rotor provided with a sleeve into which the shaft is inserted and a hub fixed on an outer circumferential surface of the sleeve,
• wherein the rotor rotates with centering an axis of the shaft, and
• wherein the outer circumferential surface of the sleeve is provided with a first outer circumferential surface having a first diameter, a second outer circumferential surface having a second diameter that is larger than the first diameter, and a receiving surface that links between the first outer circumferential surface and the second outer circumferential surface and intersects with the shaft at right angles, and
• wherein the hub is provided with a base section that extends in a direction intersecting with an axis of the shaft at right angles, a through hole that is formed in the center of the base section and engages with the outer circumferential surface of the sleeve, and a first protruded section that protrudes downward from the base section in the through hole side in parallel with the axis of the shaft, and
• wherein a tip end portion of the first protruded section is a surface intersecting with the axis of the shaft at right angles and provided with a hitting surface that contacts with the receiving surface of the sleeve,
• the method comprising the steps of
• (a) manufacturing the hub, the step of manufacturing the hub further comprising the steps of:
• (1) forming the first protruded section by applying a burring process on a metal plate having a center hole;
• and
• (2) forming the hitting surface by punching an innermost circumferential side of a tip end portion of the first protruded section;
• and
• (b) fixing the hub on the sleeve by contacting the hitting surface of the hub with the receiving surface of the sleeve