Patent ID: 9742239
Date: 2017-08-22
CPC Classifications: H02K

Claim:
1. A spindle motor comprising: a rotor portion including a rotor magnet; a bearing portion configured to support the rotor portion such that the rotor portion is rotatable about a central axis extending in a vertical direction; a base portion made of a metal, and including an upper surface, a lower surface, and a base portion through hole passing therethrough from the upper surface to the lower surface; a stator portion located on the upper surface, and including coils arranged opposite to the rotor magnet with a gap intervening therebetween; a circuit board located on the lower surface; an insulation sheet portion; a first sealant; and a second sealant; wherein the coils include a lead wire drawn out from above the upper surface downwardly from the lower surface through the base portion through hole; the circuit board includes a land portion to which the lead wire is connected; the insulation sheet portion is provided on the lower surface, and covers at least a portion of the base portion through hole; the lead wire contacts the insulation sheet portion; the first sealant is located in the base portion through hole; the second sealant covers at least a portion of the base portion through hole; and the first sealant has a coefficient of linear expansion greater than a coefficient of linear expansion of the base portion and smaller than a coefficient of linear expansion of the second sealant.