Patent ID: 8867166

Claim:
A spindle motor, comprising: a stationary unit, comprising: a base plate provided with a step portion, and a stator arranged on the base plate, the stator comprising a coil, a first protrusion radially outward the coil, the first protrusion including a power feeding portion; and a rotary unit rotatable about a center axis with respect to the stationary unit, rotary unit comprising: a rotor hub arranged axially above the base plate; a rotor magnet arranged above the stator and axially opposed to the stator with a first gap left between the rotor magnet and the stator; and a rotor yoke arranged between the stator and the base plate and axially opposed to the stator with a second gap left between the rotor yoke and the stator, wherein a lower surface of the first protrusion is arranged on an upper surface of the step portion, wherein the first protrusion extends radially outward the rotor hub such that a first periphery of the first protrusion is fixed on the upper surface of the step portion.