Patent ID: 8164851
Filing Date: 2012-04-24
Classification: G11B,H02K

Abstract:
1. A base unit for use in a storage disk drive apparatus in which a gas having a smaller density than that of air is trapped, the base unit comprising: a base portion arranged to extend radially outwardly around a central axis, and including a plurality of through holes defined therein, and a hole portion defined in a center thereof; a plate arranged below a lower surface of the base portion to close the hole portion; a stator core arranged above the base portion, and including an annular core back and a plurality of teeth arranged to project either radially outwardly or radially inwardly from the core back; U-phase coils, V-phase coils, and W-phase coils wound on the teeth and arranged to define a U phase, a V phase, and a W phase, respectively; a U-phase common wire, a V-phase common wire, and a W-phase common wire drawn out from the U-phase, V-phase, and W-phase coils, respectively; and a circuit board arranged on the lower surface of the base portion, and including at least one common wire pad portion and three lead wire pad portions arranged to be connected with the U-phase, V-phase, and W-phase coils, respectively; wherein each of the U-phase, V-phase, and W-phase common wires is arranged to pass through a separate one of the through holes to be drawn out beyond the lower surface of the base portion; each of the U-phase, V-phase, and W-phase common wires is electrically connected to a corresponding one of the at least one common wire pad portion of the circuit board through a solder; and each of the through holes is sealed with a sealant such that the base unit is airtight or substantially airtight.