Low profile spindle motor

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 first set of windings positioned below the plurality of stator teeth, each of the first set 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 first set of windings 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 first set of windings are formed of a conductive layer of a Printed Circuit Board.

A spindle motor having an axis of rotation, the spindle motor comprising:

• a laminated stator ring including:
• a first layer of magnetically permeable material forming a set of stator teeth;
• a base layer of magnetically permeable material forming a stator yoke;
• a plurality of winding cores, each of the plurality of winding cores being coupled to one of the stator teeth and extending from the one of the stator teeth in a direction substantially parallel to the axis of rotation of the motor wherein the base layer is positioned below the first layer and coupled to the plurality of winding cores and the stator teeth;
• and
• a plurality of windings positioned below the first layer and sandwiched between the first layer and the base layer, 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 axially aligned with the stator ring about the axis of rotation of the motor, the magnet having magnetic poles annularly distributed to generate magnetic fluxes along radial direction of the magnet;
• wherein each of the 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 the spindle motor further comprises a second layer of magnetically permeable material forming the set of stator teeth wherein the second layer is disposed between the first layer and the plurality of windings, an end portion of the first layer of each of the stator teeth is projected along a first axial direction, and an end portion of the second layer of each of the stator teeth is projected along a second direction opposite to the first axial direction;
• wherein, for each of the 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 plurality of windings are formed of a conductive layer of a Printed Circuit Board.

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 an end portion bent downwardly along a direction parallel to the axis of rotation of the motor 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.

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 an end portion bent downwardly along a direction parallel to the axis of rotation of the motor to define the winding core coupled to the stator tooth;
• and
• wherein the winding layer is formed of a wiring layer of a wire-bonded substrate.

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 first set of windings positioned below the plurality of stator teeth, each of the first set 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 stator teeth and the plurality of winding cores, wherein the first set of windings is disposed between the plurality of stator teeth and the stator yoke;
• wherein each of the plurality of stator teeth has an end portion bent downwardly along a direction parallel to the axis of rotation of the motor to define the winding core coupled to the stator tooth;
• and
• wherein each of the first set of windings is distributed within a first winding layer;
• wherein the spindle motor further comprises a dielectric substrate laminated to the first winding layer at a first side of the dielectric substrate, wherein the dielectric substrate and the first winding layer are disposed between the plurality of stator teeth and the stator yoke;
• wherein the first winding layer and the dielectric substrate are formed of a Printed Circuit Board;
• and
• wherein the first winding layer is formed of a conductive layer of the Printed Circuit Board.