Patent ID: 8946952
Filing Date: 2015-02-03
Classification: H02K

Abstract:
1. A spindle motor comprising: a plurality of stator teeth disposed in an annular region surrounding an axis of rotation of the motor; a plurality of winding cores, each of the plurality of winding cores being coupled to one of the plurality of stator teeth and extending from the one of the plurality of stator teeth in a direction substantially parallel to the axis of rotation of the motor; a winding layer positioned below the plurality of stator teeth, the winding layer having a plurality of windings, each of the plurality of windings surrounding one of the plurality of winding cores with an axis parallel to the axis of rotation of the motor; a rotor having a magnet positioned radially spaced apart and being coplanar with the annular region, the magnet having magnetic poles annularly distributed to generate magnetic fluxes along radial direction of the magnet; a stator yoke positioned below the plurality of stator teeth, the stator yoke being coupled to the plurality of winding cores and the plurality of stator teeth wherein the winding layer is sandwiched between the plurality of stator teeth and the stator yoke; wherein each of the plurality of stator teeth has a first end facing the magnet, the first end is projected along a direction parallel to the axis of rotation of the motor to accommodate an axial dimension of the magnet; wherein each of the plurality of stator teeth includes a first layer and a second layer laminated to the first layer, an end portion of the first layer is projected along a first axial direction, and an end portion of the second layer is projected along a second direction opposite to the first axial direction; wherein, for each of the plurality of stator teeth, an opposite end portion of the first layer and an opposite end portion of the second layer are bent along the second direction to define the winding core coupled to the stator tooth; and wherein the winding layer is formed of a conductive layer of a Printed Circuit Board or a wiring layer of a wire-bonded substrate.