Stacking-type stator using multilayer printed circuit board, and single-phase motor and cooling fan using same

1. A stacking-type stator for a single-phase motor, the stacking-type stator comprising:

a multilayer printed circuit board (PCB) that is stacked and integrated with a penetration opening; and

a coil pattern patterned on each layer of the multilayer PCB,

wherein throughholes are formed to penetrate the multilayer PCB and connect the coil patterns,

wherein the coil pattern comprises:

inner and outer rotating direction pattern portions which are arranged in a circumferential direction at intervals along an inner circumference and an outer circumference concentrically with the penetration opening; and

a radial pattern portion that interconnects the inner rotating direction pattern portion and the outer rotating direction pattern portion that are adjacent to each other and is disposed along the radial direction.

2. The stacking-type stator for a single-phase motor of claim 1 , wherein

the coil pattern is patterned in a spiral pattern so that protrusions and recesses are repeated along the perimeter of the penetration opening to form a plurality of turns, and

the number of protrusions and recesses are set to any one of the same number, half the number, and two-times the number as the number of rotor magnetic poles.

3. The stacking-type stator for a single-phase motor of claim 1 , wherein the coil pattern comprises first to third layer coil patterns formed on first to third layers which are respectively sequentially stacked, in which the first and third layer coil patterns have the same shape and the second layer coil pattern is set to be positioned at a position rotated from the first layer coil pattern to the center of the penetration opening by (360°/rotor magnetic pole number).

4. The stacking-type stator for a single-phase motor of claim 1 , further comprising a motor driving circuit mounted on the lowest layer of the multilayer PCB and applying a driving current to a stator coil formed by the layer coil patterns.

5. The stacking-type stator for a single-phase motor of claim 4 , wherein the lowest layer further comprises fourth and fifth layer coil patterns arranged in a line-symmetrical structure, and further comprises at least one jumper wire pattern connecting the fourth and fifth layer coil patterns.

6. The stacking-type stator for a single-phase motor of claim 1 , further comprising a sensing coil formed on the lowest layer of the multilayer PCB to detect the rotor rotating position.

7. The stacking-type stator for a single-phase motor of claim 6 , wherein the sensing coil is disposed in a recess of the coil pattern forming protrusions and recesses.

8. The stacking-type stator for a single-phase motor of claim 1 , wherein the number of the radial direction pattern portions is set to any one of the same number, half the number, and two-times the number as the number of rotor magnetic poles.

9. The stacking-type stator for a single-phase motor of claim 8 , wherein an angle between the adjacent radial direction pattern portions is set to a value of 360°/n where n may be any one of the same number, half the number, and two-times the number as the number of rotor magnetic poles.

10. A single-phase motor comprising:

a rotating shaft;

a rotor having the rotating shaft supported at a center of the single-phase motor and having a plurality of N-pole magnets and S-pole magnets arranged alternately;

a bearing rotatably supporting the rotation shaft;

a bearing holder for receiving and fixing the bearing; and

the stacking-type stator of claim 1 in which a penetration opening through which the bearing holder passes is formed at a center thereof.

11. The single-phase motor of claim 10 , further comprising:

a dead point prevention yoke disposed at a lower portion of the stacking-type stator and having a polygonal corner in which the centers of a plurality of magnets are opposed to each other when the rotor is in an initial state; and

a Hall sensor provided on a layer of the stacking-type stator and arranged at a position shifted by ¼ magnetic pole width or ¾ magnetic pole width from an interface of the rotor magnetic pole in the initial state of the rotor to generate a rotor position signal in which the Hall sensor is disposed at a position overlapping one of the radial direction pattern portions of the stator.

12. The single-phase motor of claim 10 , wherein the rotor is formed in a ring shape, and the width of the ring is formed to be larger than at least the length of the radial direction pattern portion, and is arranged to face the radial direction pattern portion.

13. A cooling fan comprising:

a rotor having a rotating shaft supported at a central portion thereof, a plurality of blades for an impeller at an outer circumferential portion thereof, and a plurality of N-pole magnets and S-pole magnets alternately arranged;

a bearing rotatably supporting the rotating shaft;

a bearing holder for receiving and fixing the bearing;

a lower case for supporting the bearing holder;

the stacking-type stator of claim 1 in which a penetration opening through which the bearing holder passes is formed at a center thereof and supported by the lower case;

an upper case disposed opposite to the lower case; and

a side wall connecting the upper case and the lower case.

14. The cooling fan of claim 13 , wherein the lower case comprises:

a ring portion formed at a center thereof with the penetration opening through which the bearing holder passes; and

a plurality of bridges connecting the ring portion and the lower case main body,

wherein the plurality of bridges are formed in a number equal to the number of the rotor magnetic or the number of that is the number of magnetic poles/2 to have a dead point prevention yoke function.

15. The cooling fan of claim 13 , further comprising a Hall sensor provided on a layer of the stacking-type stator and arranged at a position shifted by ¼ magnetic pole width or ¾ magnetic pole width from an interface of the rotor magnetic pole in the initial state of the rotor to generate a rotor position signal in which the Hall sensor is disposed at a position overlapping one of the radial direction pattern portions of the stator.

16. The cooling fan of claim 13 , wherein a back yoke of the rotor comprises:

a coupling portion having a penetration opening through which a rotating shaft is fixed at a central portion thereof and protruding inward;

a first cylindrical portion forming a first end receiving groove in which the bearing holder is accommodated on an inner side thereof;

a second cylindrical portion forming a second end receiving groove in which a plurality of magnets are installed on an outer side thereof and formed in a size corresponding to that of the stator; and

a stepped portion connecting the first cylindrical portion and the second cylindrical portion,

wherein the plurality of blades constituting the impeller surround the second end receiving groove of the back yoke and are extendibly formed in the same level as the second cylindrical portion.

17. The cooling fan of claim 13 , wherein a back yoke of the rotor comprises:

a coupling portion having a penetration opening through which a rotating shaft is fixed at a central portion thereof;

a first cylindrical portion forming a first end receiving groove in which the bearing holder is accommodated on an inner side thereof;

a second cylindrical portion forming a second end receiving groove in which a plurality of magnets are installed on an outer side thereof and formed in a size corresponding to that of the stator; and

a stepped portion connecting the first cylindrical portion and the second cylindrical portion,

wherein the plurality of blades constituting the impeller are extendibly formed while surrounding the first and second end receiving grooves of the back yoke.