KR20170111260A - Integrated Type Stator Using Multiple PCBs, Single Phase Motor and Cooling Fan Using the Same - Google Patents

Abstract

The present invention relates to a stacked stator using a multilayer printed circuit board (PCB) in which torque generation can be maximized in an opposing rotor, and a single-phase motor and a cooling fan using the same.
A multi-layered stator of the present invention includes: a multi-layer substrate stacked and integrated with through holes; A coil pattern patterned on each substrate of the multilayer substrate; And a through hole for passing through the multilayer substrate and connecting the coil pattern, wherein the coil pattern is formed along an inner circumference and an outer circumference which are arranged concentrically with the through hole, in a circumferential direction An inner and outer rotation direction pattern portion disposed; And a radial pattern portion that connects the adjacent inner rotation direction pattern portion and the outer rotation direction pattern portion to each other and is disposed along the radiation direction.

Description

TECHNICAL FIELD [0001] The present invention relates to a stacked stator using a multilayer printed circuit board, a single-phase motor and a cooling fan using the same,

The present invention relates to a motor, and more particularly, to a stacked stator using a multilayer printed circuit board (PCB) in which torque generation can be maximized in an opposite rotor, and a single-phase motor and a cooling fan using the same.

2. Description of the Related Art Generally, fan motors used in electronic appliances such as computers and household appliances such as refrigerators are largely adopted as outer rotor fan motors that can be made compact in the radial direction and the axial direction in consideration of their installation space.

[0002] A conventional outer rotor type fan motor is a radial type motor, and is largely constituted by a motor portion and a fan portion that rotates from the outside of the motor portion by rotation of the rotation axis of the motor portion.

The motor unit includes a stator in which a plurality of cores are disposed, and an annular magnet having a plurality of N-pole and S-pole alternately arranged so as to be opposed to the cores at regular intervals (air gap) And a rotor arranged on the outer circumferential surface of the stator by an external electrical signal is rotated by the rotation of the rotary shaft.

The conventional outer rotor type fan motor can not reduce the height of the motor because the stator adopts the core type and the diameter of the bearing which is provided at the center of the stator and supports the rotary shaft is limited, .

On the other hand, an axial flow fan using a coreless flat brushless motor is proposed in expectation of ultra lightness, ultra small size, and long life.

The axial fan disclosed in Korean Patent Application Publication No. 20-1987-0013976 (Patent Document 1) has an axial type in which the field magnet of the rotary fan and the armature coil are face-to-face, There is a problem that the height of the stator can not be reduced further by employing the structure in which the air core type armature coils are disposed.

A stator (stator) of a fan motor disclosed in Korean Patent Laid-Open Publication No. 10-2000-0044146 (Patent Document 2) includes a stator yoke and a single-phase armature coil stacked on an upper portion of a PCB, and a bearing holder Although a pair of ball bearings are built in to support the rotating shaft, there is still a problem that the stator can not be made thin.

Recent vibration motors have increased the number of turns required at thinner thicknesses by replacing conventional rotor coils or winding coils with thin film coils using printed circuit boards. The thin film coil, that is, the coil pattern substrate, which replaces the rotor coil or the winding coil, uses a method of generating a rotational force by using the principle of Lorentz Force.

When manufacturing a thin film coil for a vibration motor, a coil pattern is formed on a substrate by using a general tenting method or the like, and a plurality of thin film coils are sequentially stacked to constitute a rotor of the vibration motor.

The thin film coil disclosed in Korean Patent Publication No. 10-0678429 (Patent Document 3) includes a first coil layer for connecting coils of respective phases in common for three-phase half wave driving, and a second coil layer for connecting second, third, fourth and fifth coil layers A sixth coil layer for connection, and a seventh coil layer having brush contact terminals required for the brush type motor. However, the thin film coil disclosed in Patent Document 3 does not provide an effective structure for application to a stator of a single-phase motor.

On the other hand, a small-sized fan motor is reduced in size and a single-phase motor having a single coil is used in consideration of cost burden. In this case, the single coil is wound in a quadrangular or triangular coreless / bobbinless type and mounted on a PCB as disclosed in Korean Registered Utility Model No. 20-0296035 (Patent Document 4).

BLDC motors are synchronous motors with fast dynamic response, low rotor inertia and easy speed control.

When a brushless direct current (BLDC) motor is used as the single-phase motor, a Hall element for rotor position detection is required to detect the N pole and S pole poles of the rotor and generate a switching signal of the driving current to the stator coil Since the hall element is expensive, it is preferable to use a driving circuit using only one.

In this case, when a single hall element is used, the magnetic pole detection of the hall element is not performed when the hall element is located at the boundary surface of the rotor magnetic pole, so that the current can not be supplied to the stator coil and the dead point, Lt; / RTI >

In such a single Hall element system, there is a method of avoiding a dead point and using a magnet for fixation to the stator as a self-starting strategy to use the auxiliary magnet so that the magnetic pole of the rotor deviates from the magnetic pole interface (i.e., neutral point) of the rotor, A method in which a magnetic element screw is provided in a portion of the yoke, and a dead point prevention yoke of a special shape as in Patent Document 4 is used.

In the case of using a Hall element for rotor position detection for generating a switching signal of the driving current for the stator coil, it is necessary to use an expensive Hall element and to increase the cost of mounting additional parts for self-starting There is a demand for generating a rotor position detection signal while minimizing the cost increase factor without using a solitary pulse.

Further, various sensorless motor driving methods for detecting the rotor position detection signal without using a hall element have been proposed. It is possible to employ a double winding method in which the main coil is first wound and the auxiliary coil for rotor position detection is wound once again to extend from each coil and connected to the drive circuit. However, such a double wiring method has a disadvantage that it is difficult to use because of complicated structure and complicated winding.

Furthermore, as in Patent Document 4, in the case of a small fan, in a general coil winding system in which a stator coil is wound on a bobbin, a bobbinless type, or a core is wound on a core, the coil is composed of fine wires. Therefore, when the thickness of the coil is constant, the start line and the end line are constant, the solder land or terminal of the PCB is soldered to the PCB, or the soldering process is broken Lt; / RTI >

On the other hand, when wireless power transmission (particularly, rapid charging) is performed to a terminal, a wireless charger generates a lot of heat in a transmission coil and an electronic component, resulting in a problem of low charging efficiency. Accordingly, a cooling fan for preventing a temperature rise by an air cooling method inside the wireless charger is required. For such a cooling fan, a fan motor with a smaller size and smaller size than the fan motors of the above-described Patent Documents 1 and 2 is required.

: Korean Utility Model Publication No. 20-1987-0013976 : Korean Patent Publication No. 10-2000-0044146 : Korean Registered Patent No. 10-0678429 : Korean Registered Utility Model No. 20-0296035

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above problems, and an object thereof is to provide a laminated stator for a single-phase motor using a multilayer printed circuit board (PCB) A laminated stator using a multilayer printed circuit board having a star pattern in which a pattern portion and a radial pattern portion are alternately connected and a radial pattern portion is oriented in a radial direction so that a rotational force applied to an opposing rotor can be maximally obtained; Phase motor and a cooling fan.

Another object of the present invention is to provide a laminated stator realized by using a minimum number of PCBs by connecting conductive pattern coils of a multilayer structure without using a plurality of wiring patterns PCB, a slim type single phase motor using the same, and a cooling fan.

It is still another object of the present invention to provide a sensorless driving circuit which can realize a sensorless driving circuit inexpensively and simply by disposing a sensing coil for detecting a rotor position in an empty space in which a pattern coil is not formed, Layered stator and a slim type single-phase motor using the same.

Another object of the present invention is to provide a cooling fan capable of implementing a dead point prevention function without forming a separate dead point prevention yoke by forming a bridge corresponding to the number of rotor magnetic poles while forming air inlet in a lower case I have to.

It is a further object of the present invention to provide a sleeve for supporting a rotating shaft of a rotor utilizing a space in which a core type stator, which has been conventionally employed in a radial type motor, is removed by employing an axial type structure using a thin- The present invention provides a slim type single-phase motor capable of expanding the diameter of a bearing to contain sufficient oil, thereby improving reliability and durability, and a cooling fan having the same.

It is another object of the present invention to provide a multilayer stator in which the start portion and the end portion of each layer coil pattern are formed wider than the portions forming the coils (windings), so that the coil patterns can be interconnected or easily connected to wiring patterns, And a slim type single-phase motor using the same.

According to a first aspect of the present invention, there is provided a semiconductor device comprising: a multilayer substrate laminated and integrated with through holes; A coil pattern patterned on each substrate of the multilayer substrate; And a through hole for passing through the multilayer substrate and connecting the coil pattern, wherein the coil pattern is formed along an inner circumference and an outer circumference which are arranged concentrically with the through hole, in a circumferential direction An inner and outer rotation direction pattern portion disposed; And a radial direction pattern portion that connects the adjacent inner rotation direction pattern portion and the outer rotation direction pattern portion to each other and is disposed along the radial direction.

The coil pattern may be formed in a shape in which a plurality of protrusions and recesses are repeatedly formed according to the number of poles of the magnet.

The coil pattern may be spirally patterned to form a plurality of turns.

The coil pattern includes first to third layer coil patterns formed on first to third layer substrates sequentially stacked, and the first and third layer coil patterns have the same shape And the second coil pattern can be positioned at a position rotated from the first coil pattern to the center of the through hole by (360 占 / rotor magnetic pole number).

The multi-layered stator for a single-phase motor according to the present invention further includes a fourth layer substrate laminated on the lower portion of the third layer substrate, and a motor driving circuit, which is connected to the coil pattern and applies a driving current, A plurality of electronic components connected to the wiring pattern can be mounted.

In this case, the coil pattern may further include fourth and fifth coil patterns formed on a fourth layer substrate laminated on a lower portion of the third layer substrate, and the fourth and fifth coil patterns may be arranged in a line-symmetrical structure have.

The through hole may be disposed in a through hole region located between the outer peripheral portion of the inner rotation direction pattern portion and an inner peripheral portion of the outer rotation direction pattern portion and an outer region located outside the coil pattern when the coil pattern overlaps.

The laminated stator for a single-phase motor according to the present invention may further include at least one jumper line pattern used to connect the fourth and fifth coil patterns.

The laminated stator for a single-phase motor according to the present invention may further comprise a sensing coil formed on the first substrate of the multilayer substrate and formed in one of the plurality of recessed grooves of the coil pattern to detect the rotor rotational position .

The radiating pattern portion of the coil pattern is connected in such a manner that a current flows in the same direction, thereby generating a torsional rotational force on the rotor.

Wherein the number of the radiation pattern portions is set to be equal to the number of rotor pole teeth, one-half of the number of rotor pole teeth and twice the number of rotor pole teeth, and the angle between adjacent radial pattern portions is set to 360 占 n Here, n may be a value equal to the number of the rotor poles, a half of the rotor poles, or a multiple of the rotor poles).

According to a second aspect of the present invention, there is provided a multi-layered substrate having a plurality of coils patterned in a helical pattern so as to form a plurality of turns having two or more protrusions and recesses along the periphery of the through- At least one coil pattern layer connected by a plurality of through holes formed through the substrate; And a drive circuit layer stacked on a bottom surface of the coil pattern layer and mounted with a motor driving circuit for applying a driving current to the coil pattern, A number of the rotor poles is equal to the number of the rotor poles, a half of the number of the rotor poles, and a multiple of the number of the rotor poles), and generates a rotational force in the tangential direction A radiation pattern portion; A plurality of inner rotation direction pattern portions interconnecting the inner sides of the adjacent radial pattern portions; And a plurality of outer rotation direction pattern portions interconnecting the outer sides of the adjacent radial pattern portions.

In this case, the odd-numbered layer coil patterns form a winding in a clockwise (CW) direction from the inside to the outside, and the even-numbered layer coil patterns And may be formed so as to form a winding in a counterclockwise direction (CCW) from the inside to the outside.

The odd layer coil pattern forms a winding in a clockwise (CW) direction from the inside to the outside, and the even-numbered layer coil pattern has a clockwise May be formed to form a winding in the direction CW

Further, the start portion and the end portion of the coil pattern are formed wider than the portion forming the coil, and at least one through hole and a soldering land surrounding the through hole may be disposed.

According to a third aspect of the present invention, A rotor having the rotating shaft supported at its center and having a plurality of N pole magnets and S pole magnets alternately arranged; A bearing rotatably supporting the rotary shaft; A bearing holder for receiving and fixing the bearing; And a stacked stator as described above in which the through hole through which the bearing holder passes is formed.

A single-phase motor according to the present invention is disposed at a lower portion of the stacked stator, and has 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 the substrate of the laminated stator and arranged at a position shifted by 1/4 magnetic pole width or 3/4 magnetic pole width from the interface of the rotor magnetic pole in the initial state of the rotor to generate a rotor position detection signal And the hall sensor may be disposed at a position overlapping one of the radial pattern portions of the stator.

In this case, 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 pattern portion, and can be arranged to face the radial pattern portion.

According to a fourth aspect of the present invention, there is provided a rotor comprising: a rotor having a rotating shaft supported at a center portion, a plurality of blades for an impeller formed at an outer peripheral portion thereof, and a plurality of N pole magnets and S pole magnets alternately arranged; A bearing rotatably supporting the rotary shaft; A bearing holder for receiving and fixing the bearing; A lower case for supporting the bearing holder; A stacked stator as described above in which the through hole through which the bearing holder passes is supported 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.

The cooling fan has a sirocco type in which a wind inlet is formed in at least one of upper and lower cases, a sirocco type in which a wind outlet is formed in a part of the sidewall, or an axial flow type in which a wind inlet and a wind outlet are formed in the upper and lower cases .

A back yoke of the rotor has a coupling portion formed with a through hole through which a rotary shaft is fixed at a central portion thereof and protruding inward; A first cylindrical portion forming a first end receiving groove in which a bearing holder is accommodated; A second cylindrical portion having a size corresponding to that of the stator, the second cylindrical portion having a second end receiving groove in which a plurality of magnets are installed outside; 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 have the same level as the second cylindrical portion Can be extended.

Further, the plurality of blades constituting the impeller may be extended while surrounding the first end and the second end receiving groove of the back yoke.

Wherein the lower case includes a ring portion formed at a center thereof with a through hole through which the bearing holder passes; And a plurality of bridges connecting the ring portion and the lower case body, wherein the plurality of bridges are formed in a number equal to (the number of magnetic poles / 2) equal to the number of rotor poles, and have a dead point prevention yoke function.

As described above, according to the present invention, a stator coil for rotationally driving a rotor is realized using a conductive pattern coil formed on a multi-layer PCB, and a thin-film type is realized, thereby realizing a slim type single-phase motor capable of improving productivity and reducing cost. It is possible to provide a slim cooling fan for various electronic devices. Particularly, the cooling fan can be applied to a slim electronic device such as a wireless charger.

In addition, according to the present invention, since an axial type structure using a thin-film stator is employed, a space in which a core-type stator used in a radial type motor is removed and a space obtained by omitting a coil terminal connection portion The diameter of the sleeve bearing supporting the rotary shaft of the rotor can be expanded so as to contain a sufficient amount of oil, thereby improving reliability and durability.

Further, in the present invention, a laminated stator for a single-phase motor is constituted by using a multilayer printed circuit board (PCB), and a coil pattern of each layer is formed so as to have a star pattern in which a plurality of rotation direction pattern portions and radiating direction pattern portions are alternately connected It is possible to design the motor so as to maximize the torque generation in the rotor which is opposed to the motor so as to increase the motor efficiency. That is, the radiation pattern portion is oriented in the radial direction, so that a tangential force is generated when the stator coil is energized, so that an effective torque is obtained.

In the present invention, by setting the through holes of the respective layer PCBs to the same position, coil patterns of multilayer structure can be connected in series or parallel connection without using a plurality of wiring patterns PCB, so that they can be laminated in a slim form.

According to the present invention, a dead point prevention function can be implemented without forming a separate dead point prevention yoke by forming a bridge corresponding to the number of rotor magnetic poles while forming the air inlet in the lower case.

Further, in the present invention, the rotor position detecting sensing coils are disposed in the empty space in which the pattern coils are not formed in one surface of the PCB facing the rotor without using the rotor position detecting holster, so that the sensorless sensorless ) Driver circuit.

In the present invention, in the laminated stator, the thicknesses of the coil patterns of the respective layers are adjusted so that the starting portion and the end portion are designed to have a wider taper shape than the portion forming the coil (winding) .

That is, the start portion and the end portion of the coil pattern are formed in the shape of a tear drop, and the soldering lands surrounding the through holes and the through holes are disposed to interconnect the coil patterns, It is easy and can guarantee the reliability of the connection.

In order to increase the reliability, at least one through-hole connecting the start portion and the end portion to each layer may be formed so as to prevent the reliability from being deteriorated due to the breakage of the wire or the through hole.

1 is a plan view showing a laminated stator for a single-phase motor according to the present invention.
2A and 2B are development views showing coil patterns for respective layers of the stacked stator according to the first embodiment of the present invention.
3A and 3B are plan views showing soldering patterns of first and fourth layer PCBs, respectively.
4A and 4B are explanatory diagrams for explaining the operation of the single-phase motor using the laminated stator according to the present invention, and are explanatory diagrams showing the directions of currents when the rotor is in the initial position.
5A to 5D are explanatory diagrams showing the directions of currents according to the rotational positions of the rotors, respectively.
6 is a developed view showing a coil pattern for each layer of the stacked stator according to the second embodiment of the present invention.
Fig. 7 is an explanatory view for explaining the arrangement relationship of the dead point prevention yoke for self-starting and the Hall element in the single-phase motor according to the present invention. Fig.
8 is a pattern diagram of a first layer PCB in which a sensing coil for rotor position detection is arranged together with a coil pattern to implement a sensorless driving circuit according to the present invention.
9 is a perspective view showing a cooling fan using a slim type single-phase motor implemented using the stacked stator according to the present invention.
10 and 11 are axial cross-sectional views illustrating first and second embodiments of a slim cooling fan according to the present invention.
FIG. 12A is a plan view showing a state where a stacked stator is coupled to a lower case having a dead point prevention yoke function according to a third embodiment of the present invention, FIG. 12B is a plan view showing a state where a rotor is coupled to the stator in FIG. 12A And Fig. 12C is a plan view showing a state where the blades are coupled to the rotor in Fig. 12B.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience.

1 to 3B, a multi-layer stator 110 for a single-phase motor according to the present invention includes a plurality of substrates 10 formed by stacking a plurality of layers and made of an insulating material; A plurality of coil patterns (21 to 25) each formed of a helical conductive pattern obtained by patterning a copper foil laminated on each of the layer substrates so as to form a plurality of turns necessary for constructing a stator coil; And a plurality of through holes T1 to T7 for plating the through holes formed through the plurality of substrates 10 to connect the plurality of coil patterns 21 to 25 and the like.

The plurality of coil patterns (21 to 25) include a plurality of inner and outer rotation direction pattern portions (20a-20f) arranged along the circumferential direction with an interval between the inner circumference and the outer circumference, respectively; And a plurality of radial pattern units 20g-20l which interconnect the adjacent inner and outer rotational direction pattern units and are disposed along the radial direction from the center.

The stacked stator 110 may be constituted by using a multi-layer substrate 10a made of a copper clad laminate (CCL) in which a plurality of layers are stacked on a substrate 10. The copper foil of each layer substrate is patterned and laminated, And may be formed by forming a conductive through hole.

In the following description, a multilayer board is used to pattern a copper-clad laminate to form a coil pattern. However, it is also possible to form a coil pattern by printing a coil pattern on a general substrate using silver-paste or copper-paste without using a copper-clad laminate And this case should also be regarded as falling within the scope of the present invention.

The substrate 10 may be made of an insulating resin such as FR-4 or CEM-3, which is made of a glass epoxy laminate, for example. The multilayer substrate 10a has a structure in which a copper foil is laminated on the substrate 10 of each layer and any insulating resin can be used as a material of the substrate if the multilayer PCB can be constructed. And may be set within a range of one to ten layers in proportion to the desired RPM. In order to obtain a high RPM, it is required to increase the number of PCBs stacked so as to use the plurality of coil patterns 21 to 25 since a large number of coil turns is required so as to obtain a high torque value.

When a multilayer board 10a in which a multilayer PCB is stacked is used, a print wiring 17 for interconnecting a coil pattern and an electronic component is formed on the lowermost PCB, and various electronic components 16 are mounted on the printed wiring 17, And the driving power source is connected to the power supply terminal Vcc of the printed wiring 17 and the ground pattern GND.

The stator for a single-phase motor according to the present invention may be constructed using a double-sided substrate on which a copper foil is laminated on both sides of the substrate 10 when high RPM is not required. In this case, And the motor driving circuit 30 is mounted on the back surface.

In the following description of the embodiment, as shown in FIGS. 2A and 2B, an example in which the multilayer substrate 10a is composed of a multilayer PCB having a first layer to a fourth layer PCB 11 to 14 having a four-layer structure is described do.

The first to third PCBs 11 to 13 are respectively provided with first to third coil patterns 21 to 23 having a star shape on the upper surface of the substrate 10, For example, fan-shaped fourth and fifth coil patterns 24 and 25 are separately formed on the fourth layer PCB 14, and a conductive metal such as a copper foil (Cu) And is formed by patterning. Each of the PCBs 11 to 14 may be selected from among those having various thicknesses of, for example, 0.4 mm and 0.8 mm, and the coil patterns 21 to 25 applied to the present embodiment may be, for example, The width is 0.12 mm, and the interval between adjacent patterns is 0.13 mm. The width of the coil pattern and the distance between the patterns can be increased or decreased as needed.

The first and third coil patterns 21 and 23 and the fourth coil pattern 24 are formed to have a helical shape in a clockwise direction CW from the inside to the outside, And the second coil pattern 22 and the fifth coil pattern 25 are formed so as to have a helical shape in a counterclockwise direction CCW from the inside to the outside, And has a zigzag shape so as to have three protrusions and recesses to form a star shape.

Of course, each of the first to third coil patterns 21 to 23 has a helical shape and is directed from the inside to the outside or from the outside to the inside depending on the connection method of the coil pattern using the through holes, A clockwise direction CCW pattern, or a zigzag shape so as to have two or more protrusions and recesses in a large scale.

As shown in Figs. 4A and 4B, each of the first to third coil patterns 21 to 23 has three outer and inner rotation direction pattern portions 20a to 20c and 20d to 20f, Six radiation pattern portions 20g to 20l connecting the direction pattern portions 20a to 20c and the inner rotation direction pattern portions 20d to 20f are alternately connected to form a star shape as a whole.

The outer and inner rotation direction pattern portions 20a to 20c and 20d to 20f are arranged along the circumferential direction with an interval between the outer circumference and the inner circumference respectively and the six radiation direction pattern portions 20g to 20l are formed as a whole, Are oriented along the direction of radiating from the center of the substrate 10, and the inner ends have a pattern shape such that the distance between the two ends is narrower.

The first and third coil patterns 21 and 23 of the first and third PCBs 11 and 13 are formed in the same shape and the second coil pattern 22 of the second layer PCB 12 is made of the same material 1 and the third coil patterns 21 and 23, but is deviated by a phase difference of 60 degrees.

As a result, when the first to third PCBs 11 to 13 are laminated, the six radiation pattern parts 20g to 20l in the first to third coil patterns 21 to 23 are arranged at the same position I have. Therefore, as will be described later, when three layers of PCBs are stacked, the radiating pattern units 20g to 20l each have a position where the coil patterns stacked in three layers face each other at the same time as the magnets of the rotor, The same torque is generated.

The stator 110 according to the present invention connects the first to fifth coil patterns 21 to 25 formed on the multilayer PCB to form a stator coil. The number of the radial pattern portions 20g to 20l in the stator coil is The number of the rotor poles is set to be equal to the number of the rotor poles, one-half of the number of the rotor poles and twice the number of the rotor poles) 20g to 20l is determined by 360 / n (where n is the number of rotor poles, 1/2 of rotor poles, and 2 times of rotor poles).

Therefore, in the case of the stator having the six radial pattern portions 20g to 20l shown in Figs. 2A and 2B, the angle between the adjacent radial pattern portions 20g to 20l is 60 DEG, And the number of magnetic poles (N pole and S pole magnets) of the rotor coupled to the rotor is configured to have six poles.

The printed wiring 17 necessary for mounting and wiring various electronic components 16 to form the drive circuit 30 necessary for driving the single-phase motor is formed in the fourth PCB 14 in a conductive pattern.

The fourth and fifth coil patterns 24 and 25, which are added to the first to third coil patterns 21 to 23, are formed in the fourth layer PCB 14 by utilizing a space remaining after mounting the driving circuit components. And the fourth and fifth coil patterns 24 and 25 may be omitted depending on the torque value required to rotate the rotor.

The fourth layer PCB 14 shown in FIG. 2B shows a state in which the fourth layer PCB 14 shown in FIG. 2B has various patterns, that is, the fourth and fifth coil patterns 24 and 25, the printed wiring 17, ) Is located on the backside of the substrate 10. [

The fourth coil pattern 24 is a pattern formed in a sector shape so as to have a helical shape in a clockwise direction CW from the outside to the inside and the fifth coil pattern 25 is a pattern formed in a counterclockwise direction CCW It is a pattern formed in a fan shape so as to have a spiral shape.

When the first to fourth PCBs 11 to 14 of the present invention are laminated, the first to fifth coil patterns 21 to 25 are connected in serial or parallel manner through the first to seventh through holes T1 to T7 When interconnected, one stator coil is formed. The first to seventh through holes T1 to T7 are plated or filled with a conductive material inside the holes.

The stator for a single-phase motor according to the present invention includes first to third PCBs 11 to 13, in which first to third coil patterns 21 to 23 having a star shape are formed on an upper surface of a substrate 10, And the fourth layer PCB 14 forms a drive circuit layer on which the motor drive circuit 30 is mounted.

In the present invention, seven through-holes T1 to T7 are formed at the same positions of the first to fourth PCBs 11 to 14 as shown in FIG. 3A, and a soldering land 18 is formed as shown in FIG. Are formed in a conductive pattern. The starting portions S1 to S5 and the end portions E1 to E4 of the first to fifth coil patterns 21 to 25 are wider than the portions forming the coils (windings) as shown in FIG. 3B and FIG. For example, in the form of a tear drop, and a soldering land 18 surrounding the through holes T1 to T7 and the through holes T1 to T7 is disposed.

As a result, in the present invention, the starting portions S1 to S5 and the end portions E1 to E4 are designed to be wider than the portions forming the coil (winding) by adjusting the thicknesses of the coil patterns 21 to 25 in the stacked stator So that the reliability of the connection can be increased.

That is, the start portion and the end portion of the coil pattern are formed in the shape of a tear drop, and the soldering lands surrounding the through holes and the through holes are disposed to interconnect the coil patterns, It is easy and can guarantee the reliability of the connection.

In order to increase reliability, at least one or more through holes (T1 to T7) connecting the start portion and the end portion to each layer may be formed in plural to prevent the reliability from being deteriorated due to failure of the wire or through hole.

Through holes T3 and through holes are formed in the second layer PCB 12 in order to connect the fourth coil pattern 24 and the fifth coil pattern 25 formed above and below the fourth layer PCB 14, A first jumper wire pattern J1 is formed on the outer surface of the second coil pattern 22 and a fourth coil pattern 22 is formed on the third layer PCB 13, The second jumper line pattern J2 connecting the fourth through-hole T4 and the fifth through-hole T5 for connecting the start portion S5 of the inside from the outside of the third coil pattern 23, As shown in Fig.

The first through fifth coil patterns 21 through 25 may be formed in the through holes T1 through T7 and the first and second jumper wire patterns 11 through 14 when the first through fourth PCBs 11 through 14 of the present invention are laminated. J1 and J2 to form one stator coil.

That is, the first coil pattern 21 of the first layer PCB 11 is electrically connected to the second coil pattern 22 of the second layer PCB 12 via the second through hole T2, And the end portion E2 of the second coil pattern 22 is connected to the start portion of the third coil pattern 23 of the third layer PCB 13 via the sixth through hole T6 S3.

The end portion E3 of the third coil pattern 23 is connected to the start portion S3 of the fourth coil pattern 24 of the fourth layer PCB 14 through the first through hole T1, The end portion E4 of the fourth coil pattern 24 and the start portion S5 of the fifth coil pattern 25 are connected to the first jumper line pattern J1 connecting the through hole T3 and the through hole T4 And the jumper line pattern J2 connecting the through hole T4 and the through hole T5.

As a result, one end of the stator coil, that is, the end portion of the fifth coil pattern 25 is connected to the first output terminal Out1 of the drive circuit, and the other end of the stator coil, (S1) is connected to the second output terminal (Out2) of the drive circuit through the sixth through hole (T6).

In the present invention, between the inner peripheral portion of the outer rotation direction pattern portions 20a to 20c of the first and third coil patterns 21 and 23 and the outer peripheral portion of the inner rotation direction pattern portion of the second coil pattern 22, The coil patterns are not interposed between the outer peripheral portions of the inner rotation direction pattern portions 20d to 20f of the third coil patterns 21 and 23 and the inner peripheral portion of the outer rotation direction pattern portion of the second coil pattern 22, The first to seventh through holes T1 to T7 are set so that the widths of the first to fifth coil patterns 21 to 25 are set so that the hole regions R1 to R6 are present. And the outer space R10 of the first inner fifth coil patterns 21 to 25 are used.

As a result, in the present invention, when connecting the start or end terminal disposed inside the first inner fifth coil patterns 21 to 25 to the coil pattern of the other layer, one of six through hole regions R1 to R6 The through holes T2, T3, and T5 to T7 formed by using the through holes may be used.

In the present invention, the through-holes T1 to T7 are appropriately utilized by using the through-hole regions R1 to R6 and the outer space R10 so that the coil patterns of the multilayer PCB can be connected in series or in parallel without using a separate wiring pattern PCB Can be connected in parallel connection.

Although the driving circuit 30 for driving the single-phase motor is mounted on the fourth PCB 14 in the embodiment shown in FIG. 2, the driving circuit may be separately formed. 10 and 11, when a sufficient space can not be secured between the stator and the lower case on which the stator is mounted, only a minimum number of drive circuit components can be mounted on the back surface of the fourth PCB 14 have.

Hereinafter, a single-phase motor using the laminated stator of the present invention will be described with reference to Figs. 4 to 5D. 5A to 5D, the current flows by the rotational positions of the rotors are applied to the first coil pattern 21 of the first layer PCB 11 and the second to fifth coils of the second to fourth layer PCBs 12-14, Only the first coil pattern 21 of the first layer PCB 11 will be described since the current flows to the patterns 22 to 25 are the same.

The illustrated single-phase motor 40 has a structure in which a stator 110 and a rotor 120 of a 6-slot-6-pole structure are arranged in an axial type so as to face each other, .

When the driving power source Vcc is supplied to the motor driving circuit 30 when the rotor 120 is at the initial position (0 deg.), The hall sensor H1 recognizes the magnetic pole (S pole) of the rotor, When a pair of first rotor position detection signals containing a rotation direction (i.e., counterclockwise direction CCW) is generated and applied to the two first and second switching transistors of the motor driving circuit 30, The second switching transistor is turned off and the direction of current flow of the driving current to the stator coils, that is, the first to fifth coil patterns 21 to 25, is determined.

A current flows in the direction from the start portion S1 of the first coil pattern 21 to the end portion of the fifth coil pattern 25 as the rotation direction of the rotor is determined as the counterclockwise direction CCW, Are indicated by arrows in the first to fifth coil patterns 21 to 25.

In this case, since the outer and inner rotation direction pattern portions 20a to 20c and 20d to 20f of the first to fifth coil patterns 21 to 25 are arranged in a substantially concentric circle shape, the force generated according to the Fleming left- F) in the radial direction does not affect the torque generation.

The first through fifth coil patterns 21 through 25 are connected to each other through the through holes T1 through T7 and the jumper wire patterns T1 and J2 so that the flow directions of the driving currents flowing through the radial pattern portions at the same positions are the same. The connection is made.

For example, the radial pattern portions 20g and 20h of the first coil pattern 21 are disposed in the radial pattern portions 22g and 22h of the second coil pattern 22, in the radial direction of the third coil pattern 23 The direction of current flow is set in the same direction as both the pattern portions 23g and 23h and the radial pattern portions 24g and 24h of the fourth coil pattern 24. [ As a result, the radial pattern portions 20g to 20l are oriented in the radial direction (i.e., normal direction) perpendicular to the rotational direction (circumferential direction) of the rotor 120, , A tangential force F is generated.

Therefore, the outer and inner rotation direction pattern portions 20a to 20c and 20d to 20f of the first to fifth coil patterns 21 to 25 serve as a path through which only current flows, and the six radiation pattern portions 20g to 20f, The rotor 120 is rotated in a tangential direction.

The direction of the current flowing in the coil between the adjacent radial pattern portions 20g to 20l is reversed and the magnetic poles of the corresponding magnets of the rotor 120 are also reversely positioned. Pushing or pulling force is generated and the rotor is rotated counterclockwise (CCW).

Next, a case in which the rotor 120 is rotated by 15 degrees (electrical angle 45 degrees) by a mechanical angle is shown in Fig. 5A, and a case where the rotor is rotated by 30 degrees (electrical angle 90 degrees) is shown in Fig. 5B , And a case in which the mechanical angle is rotated by 45 ° (electrical angle of 135 °) is shown in FIG. 5c.

5C, the Hall sensor H1 is located at the interface between the N pole magnet 121a and the S pole magnet 121f and does not recognize the magnetic pole. When the rotor 120 is positioned at the position shown in FIG. 5C, can not do.

Fig. 5D shows a case where the rotor 120 continuously rotates by the rotational inertia and rotates by 60 degrees (electrical angle 180 degrees) with respect to the machine angle. When the rotor rotates at an angle of 45 degrees (135 degrees in electrical angle), the Hall sensor H1 recognizes the N pole magnet 121a. In this case, the hall sensor H1 generates and outputs to the first and second switching transistors a pair of second rotor position detection signal outputs having the opposite polarity to the first rotor position detection signal, whereby the first switching transistor And the second switching transistor is turned on so that the current flow direction of the driving current to the stator coils, that is, the first to fifth coil patterns 21 to 25, is reversed as shown in Fig. 5D.

As a result, as shown in Fig. 5D, when the current flowing directions of the driving currents to the first to fifth coil patterns 21 to 25 are reversed, the radial pattern portions 20g to 20l are formed in accordance with the Fleming left- A tangential force F is generated in the counterclockwise direction CCW and the rotor 120 is rotated.

As described above, the motor driving circuit 30 detects the magnetic pole of the rotor every time the Hall sensor H1 rotates 60 degrees (180 degrees electrical angle) to the machine angle, and outputs the first rotor position detection signal and the second rotor position detection signal The first and second switching transistors are alternately turned on and off to change the current flowing direction of the driving current to the first to fifth coil patterns 21 to 25.

Hereinafter, a stacked stator according to a second embodiment of the present invention will be described with reference to FIG.

2, the first and third coil patterns 21 and 23 and the fourth coil pattern 24 have a spiral shape in a clockwise direction (CW) And the second coil pattern 22 and the fifth coil pattern 25 are formed so as to have a helical shape in the counterclockwise direction CCW, respectively.

That is, in the first embodiment, the coil pattern of the odd-numbered layer PCB is formed to have a helical shape in the clockwise direction (CW), and the coil patterns of the even-numbered layer are formed to have the helical shape in the counterclockwise direction (CCW).

6, all of the first to fourth coil patterns 21 to 24 are formed to have a spiral shape in the clockwise direction (CW), and only the fifth coil pattern 25, Is formed so as to have a spiral shape in the counterclockwise direction (CCW).

The first and third coil patterns 21 and 23 are formed such that the start portions S1 and S3 are disposed on the inner side and the end portions E1 and E3 are disposed on the outer side while the second coil pattern 22 is disposed on the outer side And an end portion E2 is disposed on the inner side.

In the second embodiment, the coil patterns 21 to 23 of all the layers PCB are different from the first embodiment in that they are formed to have a helical shape in the clockwise direction (CW).

However, since the fourth and fifth coil patterns 24 and 25 of the fourth layer PCB 14 are arranged at positions opposed to each other in a line symmetrical structure, the fourth coil pattern 24, both of the first and second embodiments, Is wound in the clockwise direction (CW), and the fifth coil pattern 25 has the pattern wound in the counterclockwise direction (CCW).

The stacked stator according to the second embodiment is characterized in that when the coil patterns 21 to 23 of all the layers PCB are formed of windings having a spiral shape in the clockwise direction (CW), the first and second 3 coil patterns 21 and 23 are provided with start portions S1 and S3 on the inner side and end portions E1 and E3 on the outer side and the second coil pattern 22 of the even- A start portion S2 is disposed on the outer side, and an end portion E2 is disposed on the inner side.

The stacked stator according to the second embodiment is configured such that all of the coil patterns 21 to 23 are formed by windings having a helical shape in the clockwise direction (CW), then the fourth coil pattern 24 of the fourth layer PCB 14 The third and fourth jumper wire patterns J11 and J12 are formed on the third layer PCB 13 to connect the fifth coil pattern 25 and the fifth jumper wire pattern J11 and J12 are formed on the fourth layer PCB 14. [ J13).

In addition, since the first to third coil patterns 21 to 23 are disposed at the same position and at the same position in the laminated stator according to the second embodiment of the present invention, the coil patterns of the respective layers are mutually connected It is possible to secure a wider space for arranging the through holes used for making the through holes.

The remaining portions except the region where the fourth coil pattern 24 and the fifth coil pattern 25 overlap with the first to third coil patterns 21 to 23 are the 11th to 18th through holes T11 to T18 Hole regions R11 to R16 that can be arranged.

That is, as viewed from the first-layer PCB 11, portions of the left and right recessed portions and the inner region of the upper protruding portions of the first to third coil patterns 21 to 23, the inner region of the lower protruded portion, Part of the area corresponds to the through hole regions R11 to R16.

The 11th to 18th through holes T11 to T18 are arranged in the through hole regions R11 to R16 and the first to fifth coil patterns 12 to 15 are formed by using the third to fifth jumper line patterns J11 to J13, 21 to 25 are connected, one stator coil is formed.

That is, the first coil pattern 21 of the first layer PCB 11 is wound in the clockwise direction in the start portion S1, and then the end portion E1 is electrically connected to the second layer PCB 12 through the twelfth through hole T12. The end portion E2 of the second coil pattern 22 is connected to the start portion S2 of the second coil pattern 22 of the third layer PCB 12 via the seventeenth through hole T17, To the start portion S3 of the third coil pattern 23 of FIG.

The end portion E3 of the third coil pattern 23 is connected to the start portion S4 of the fourth coil pattern 24 of the fourth layer PCB 14 through the eleventh through hole T11, The end portion E4 of the fourth coil pattern 24 and the start portion S5 of the fifth coil pattern 25 are interconnected through the third to fifth jumper line patterns J11 to J13.

The end portion E5 of the fifth coil pattern 25 is connected to the first output terminal Out1 of the motor driving circuit 30 and the other end of the stator coil, The start portion S1 of the pattern 21 is connected to the second output terminal Out2 of the drive circuit through the seventeenth through hole T17.

In the stacked stator according to the second embodiment of the present invention, a part of the motor drive circuit 30 mounted on the fourth layer PCB 14 is disposed on the left side and a part of the motor drive circuit 30 is dispersed on the right side. When the driving power source Vcc is supplied to the motor driving circuit 30 of the fourth layer PCB 14, the opposed rotor is rotated in the same manner as in the first embodiment.

In the single-phase motor using the stacked stator according to the present invention, one Hall sensor H1 is disposed on the PCB forming the stator for rotor position detection, and a dead point prevention yoke made of iron plate or silicon steel Can be adopted. When the dead point prevention yoke is used, the initial position of the rotor can be set to stop at a predetermined position. If the hall sensor is installed at a position where the dead point can be prevented in consideration of the initial position of the rotor, self-starting failure phenomenon can be avoided .

7, the shape of the dead point prevention yoke 170 is the same as the number of magnetic poles (six poles) of the rotor, that is, The outer peripheral surface has a hexagonal shape and the inner peripheral surface has a circular shape. In this case, when the rotor 120 is in the initial state, the center of each magnet is connected to the dead point prevention yoke 170 by the magnetic phenomenon between the magnet 121 of the rotor 120 and the dead point prevention yoke 170 170) is located opposite to the widest point (i.e., the edge) of the effective area.

Therefore, it is preferable that the Hall element H1 is disposed at a position shifted from the boundary surface of the magnetic pole by a 1/4 magnetic pole width (15 ° in the case of a six pole rotor) or by a 3/4 magnetic pole width. The reason why the Hall element H1 is disposed at a position shifted by 1/4 the width of the magnetic pole from the interface of the magnetic pole is that since the magnetic flux generated from the magnet at this point is the maximum, the Hall element H1 is the rotor position detection signal . ≪ / RTI >

Further, in the present invention, the Hall element H1 is disposed in the first to third coil patterns 21 to 23 of the stator at a point of 1/4 magnetic pole width from the interface of the magnetic poles, and the radial pattern portions 20g- 20l are positioned.

As shown in FIG. 7, in a state in which one of the radiation pattern portions 20l of the radiation pattern portions 20g to 20l coincides with the Hall element H1 and is located at a point where the width becomes 1/4 of the magnetic pole width from the boundary surface of the magnetic pole , When the driving power is applied to the motor drive circuit and the rotor is started, the radial pattern portion 201 is opposed to the point where the magnetic flux generated from the magnet 121f is the maximum, do.

When the rotation direction of the rotor is counterclockwise (CCW), it is preferable that the Hall element H1 is provided at a 1/4 magnetic pole width point in the counterclockwise direction from the hexagonal corner of the dead point prevention yoke 170 And the rotation direction is the clockwise direction (CW), the Hall element H1 is installed at the 1/4 pole width point in the clockwise direction from the hexagonal corner of the dead point prevention yoke 170 to avoid the self-starting disabled phenomenon .

8 is a modification of the first layer PCB 11 in which the sensing coil 26 for detecting the position of the rotor is disposed together with the coil pattern 21 in order to implement a sensorless driving circuit according to the present invention. Respectively.

The sensing coil 26 for detecting the rotor position should be selected from three recesses located between the three protrusions forming a space that is not overlapped with the first coil pattern 21 of the first layer PCB 11, A pair of through holes T8 and T9 for drawing both ends of the sensing coil 26 to the fourth layer PCB 14 are disposed in a space that does not overlap with the first to fifth coil patterns 21 to 25 And it is necessary to consider the connection relation with the drive circuit 30 formed on the fourth layer PCB 14. [

The sensing coil 26 for detecting the position of the rotor according to the present invention is disposed in the groove of the first layer PCB 11 in consideration of the above matters and has a fan shape as a whole and has a spiral shape in a clockwise direction CW from the inside to the outside As shown in FIG.

8, when the rotor position detecting sensing coil 26 is formed on the first layer PCB 11 facing the rotor, when the magnet approaches the rotor position detecting sensing coil 26 at the time of rotation of the rotor An induced electromotive force is generated by the electromagnetic induction from the sensing coil 26. The motor drive circuit 30 changes the direction of the current flowing through the stator coil by turning on the switching element by using the induced electromotive force.

In the present invention, it is possible to simultaneously form the stator coil by patterning the copper foil of the PCB substrate by the arrangement process as shown in Fig. 8, and at the same time to form the sensing coil 26 for rotor position detection.

Hereinafter, a cooling fan using the above-described stacked stator will be described.

9 shows a cooling fan using a slim type single-phase motor implemented by using the laminated stator according to the present invention. Figs. 10 and 11 show a slim type cooling fan according to the first and second embodiments of the present invention, Directional cross-sectional view is shown.

9 and 10, a cooling fan 100 using a slim type single-phase motor according to the present invention is formed with a case by coupling a lower case 101 having an upper case 103 and a side wall 102 formed thereon, And a slim type single-phase motor 40 implemented by using a stacked stator 110 in a case is provided.

The single-phase motor 40 includes a laminated stator 110, a sleeve bearing 150, a rotating shaft 140, and a rotor 120.

A bearing holder 160 for receiving a sleeve bearing 150 at a central portion of the lower case 101 is integrally formed by, for example, insert molding. The bearing holder 160 includes a cylindrical boss The sleeve bearing 150 is inserted into the bearing housing 160a.

A thrust plate (or bearing seat) 106 is provided between the sleeve bearing 150 and the inner bottom surface of the bearing holder 160 to support the rotation shaft 140 of the rotor 120 .

A stacked stator 110 according to the present invention as shown in FIG. 2 is mounted on the bottom surface of the lower case 101. The stator 110 has a central portion formed at an outer surface of the boss 160a of the bearing holder 160 A larger through hole 15 is formed.

The rotation shaft 140 of the rotor 120 is coupled to the through hole of the sleeve bearing 150 and the rotation shaft 140 is fixed to the center of the rotor 120.

The rotor 120 includes a back yoke 123 and a plurality of magnets 121 made of a magnetic material so as to serve as a magnetic path and the magnets 121 are disposed on the coils of the stator 110 Phase motor 40 is constituted by an axial type structure.

It is preferable that the plurality of magnets 121 are arranged such that N poles and S poles are alternately arranged and the number of magnetic poles is equal to the number of the radial pattern portions 20g through 20l of the coil pattern 21. [ Accordingly, the single-phase motor 40 constructed using the stator of FIG. 1 has a six-slot / six-pole structure.

The back yoke 123 is formed with a coupling portion 123e having a through hole through which the rotation shaft 140 is fixed, and protrudes outward.

The back yoke 123 has a first cylindrical portion 123b having a first end receiving groove 123a formed on the inner side and being formed larger than an outer diameter of the boss 160a of the bearing holder 160, And a second cylindrical portion 123d which forms the receiving groove 123c and has a size corresponding to the stator 110. A stepped portion is formed between the first cylindrical portion 123b and the second cylindrical portion 123d Thereby forming a receiving groove having a two-stage structure.

The bearing housing 160 is accommodated in the first end accommodating groove 123a of the back yoke 123 and a plurality of magnets (not shown) are accommodated in the second end accommodating groove 123c in correspondence with the coil pattern 21 of the stator 110. [ 121 are installed.

The plurality of magnets 121 may be formed of N-poles and S-poles by using a rare-earth magnet or ferrite magnet having a large coercive force, such as Nd alloy or Co alloy, As shown in FIG.

A plurality of blades 130 are integrally formed on the outer surface of the back yoke 123 of the rotor 120 by insert molding to constitute the impeller 105. In this case, the blade 130 extends to the same level as the first cylindrical portion 123b while surrounding the outer surface of the stepped portion 123b of the back yoke 123 and the second end receiving groove 123c, The blade 130 may be extended from the back yoke 123 at an angle of inclination or extended in the radial direction as shown in FIG.

The lower case 101 may be formed with a through slot such that a connector or a cable necessary for applying power and control signals from the system body is coupled to the stator 110, And may have a wind inlet 108 formed with at least one through hole for sucking the heated air inside the main body (for example, a wireless charger or the like).

9, a side wall 102 is formed at a right angle on the outer circumferential portion of the lower case 101 and joined together with the upper case 103 to form a Sirocco type fan. Is opened to form a blow-out port 107 for blowing out the sucked air. In this case, the side wall 102 is formed of the same resin as the bearing holder 160 and is integrally formed with the lower case 101 of metal by insert molding.

However, the side wall 102 may be formed by insert molding together with the upper case 103 instead of the lower case 101. In addition, the bearing holder 160 and the lower case 101 may be integrally formed by insert molding using resin.

The upper case 103 is also provided with at least one through hole 103 for sucking the heated air inside the main body (for example, a wireless charger or the like) from a direction opposite to the upper case 103, The air inlet 104 may be formed.

The cooling fan 100 of the present invention has an air inlet formed in both the upper case 103 and the lower case 101 in FIG. 9, but one of the upper case 103 and the lower case 101, It is also possible that the air inlet 104 is formed only in the upper case 103.

In the cooling fan 100 of the present invention, instead of forming the air outlet 107 at one side of the side wall 102, the through holes may not be formed in all the side walls 102, And may be configured to be of an axial flow type which is introduced from one side of the upper case 103 and the lower case 101 and discharged to the other side.

The cooling fan 100 of the present invention configured as described above employs a single-phase motor 40 as an axial type structure and a multi-layered stator as a single-phase motor. As a result, the cooling fan 100 of the present invention can realize a single-phase motor 40 having a slim structure than a conventional fan motor employing a core-type stator, thereby realizing a slim cooling fan 100.

In addition, the cooling fan 100 of the present invention has a structure in which a sleeve bearing 150 that supports the rotating shaft 140 of the rotor 120 utilizing a space in which a coreless stator, which was conventionally employed in a radial type motor, The diameter can be extended to contain sufficient oil.

11, the second embodiment of the present invention differs from the first embodiment only in the structure of the rotor and the impeller, and the other parts are the same, so that a description thereof will be omitted.

In the second embodiment, the back yoke 122 of the rotor 120 is formed with a coupling portion 123f having a through hole through which the rotation shaft 140 is fixed, and protrudes inward.

The back yoke 122 includes a first cylindrical portion 123b having a first end receiving groove 123a formed on an inner side thereof and formed to be larger than an outer diameter of the boss 160a of the bearing holder 160, And a second cylindrical portion 123d having a size corresponding to the stator 110 and forming a receiving groove 123c. A stepped portion is formed between the first cylindrical portion 123b and the second cylindrical portion 123d, So as to form a receiving groove having a two-stage structure.

The bearing housing 160 is accommodated in the first end accommodating groove 123a of the back yoke 122 and a plurality of magnets (not shown) are accommodated in the second end accommodating groove 123c in correspondence with the coil pattern 21 of the stator 110. [ 121 are installed.

The back yoke 122 of the rotor 120 has a coupling portion 123f formed with a through hole through which the rotation shaft 140 is fixed and is protruded inwardly and inserted into the sleeve bearing 150 Is set to a reduced length as compared with the first embodiment.

A plurality of blades 130 integrally formed by insert molding on the outer surface of the back yoke 123 so as to constitute the impeller 105 in the first embodiment are inserted into the second stage receiving groove 123c of the back yoke 123, And extends to the same level as the second cylindrical portion 123d.

The blade 130 of the second embodiment is set to have a narrow width as compared with the blade of the first embodiment and the exposed surface of the back yoke 122 and the rotary shaft 140 is set to almost the same level as the upper case 103 As a result, it is possible to lower the height of the side wall 102 between the upper case 103 and the lower case 101.

As described above, the cooling fan 100 according to the second embodiment of the present invention forms the coupling portion 123f of the back yoke 122 inwardly, and at the same time, the sleeve bearing 150, the rotation shaft 140, the blade 130 And the height of the side wall 102 can be lowered, the thickness of the entire cooling fan 100 can be more slimly designed.

FIG. 12A is a plan view showing a state where a stacked stator is coupled to a lower case having a dead point prevention yoke function according to a third embodiment of the present invention, FIG. 12B is a plan view showing a state where a rotor is coupled to the stator in FIG. 12A And Fig. 12C is a plan view showing a state where the blades are coupled to the rotor in Fig. 12B.

12A to 12C, the cooling fan 100 according to the third embodiment of the present invention is similar to the cooling fan 100 according to the first and second embodiments in that a lower case 201 having a dead point- There is a difference.

The lower case 201 of the third embodiment uses a metal material capable of acting as yoke like an iron plate and has a number corresponding to the number of poles of the rotor 120 so as to have a dead point prevention yoke function, And is connected to the annular ring portion 201b at the center via six bridges 201a.

The lower case 201 may be formed, for example, in a square shape, and one side where the side wall 102 is not formed forms the air outlet 107 when the upper case 103 is engaged.

In this case, a through hole 15 is formed at the center of the annular ring portion 201b so that the bearing housing 160 can pass through.

12A to 12C, the number of bridges 201a corresponding to the number of magnetic poles of the rotor 120 is used, but it is also possible to use a bridge 201a having the number of (number of magnetic poles / 2) Do.

When the number of bridges 201a corresponding to the number of poles of the rotor 120 is formed in the lower case 201 made of a metal material capable of acting as a yoke as described above, The center of each magnet is positioned between the magnet 121 and the bridge 201a of the rotor 120 by the magnetic phenomenon while being opposed to the bridge 201a in the initial state.

Therefore, in consideration of the initial state of the rotor, the Hall element H1 is applied to the stator 110 at a position shifted from the interface of the magnetic pole by a 1/4 magnetic pole width (15 degrees in the case of a six pole rotor) or by a 3/4 magnetic pole width Install it. It is also preferable that the Hall element H1 is arranged at a 1/4 magnetic pole width (15 degrees in the case of a six-pole rotor) from the interface of the magnetic poles and at the same time the radial pattern portion of the coil pattern is opposed.

If the above conditions are satisfied, the magnetic element H1 and the radiation pattern portion are opposed to each other at a position where the magnetic flux generated from each magnet is maximized when the rotor is started.

As a result, the six bridges 201a formed in the lower case 201 have a dead point preventing yoke function, and the space between the bridges 201a serves as the air inlet 108.

In this case, the magnets 121 of the rotor 120 are formed in a ring shape and multipolar magnetized so that N poles and S poles are alternately arranged, and the width of the ring is at least equal to the length of the radial pattern portions 20g through 20l And is disposed so as to face the radial pattern portions 20g to 20l.

12C, a plurality of blades 130 integrally formed on the rotor 120 constitute an impeller 105. A member number 102a is integrally formed on a side wall of the rotor 120, Refers to the snap engagement used when engaged.

In the above description of the embodiment, a single-phase motor is used as a fan motor. However, the present invention is also applicable to other fields requiring a compact and slim type motor in addition to a fan motor.

The single-phase motor of the above-described embodiment can be operated not only by the single-phase propagation system but also by the single-phase halfwave system.

In the above description of the embodiment, a laminated stator in which a multilayer printed circuit board (PCB) is laminated is used as a single-phase motor. However, in the case of a motor having a small number of turns required for forming a stator coil, It is also possible to construct a slim type stator. That is, it is also possible to form a coil pattern on one surface of a double-sided printed circuit board (PCB) and form a motor drive circuit on the other surface.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limited to the embodiments set forth herein. Various changes and modifications may be made by those skilled in the art.

The present invention can be applied to a slim type single-phase motor and a cooling fan using the laminated stator which can be realized as a slim type by using a multilayer printed circuit board (PCB) having a coil pattern capable of maximally generating torque in an opposite rotor Do.

10: substrate 11-14: PCB
15: Through hole 16: Electronic part
17: Print wiring 18: Soldering land
20a-20f: rotation direction pattern portion 20g-20l:
21-26; Coil pattern 30: drive circuit
40: Single phase motor 100: Cooling fan
101, 201: lower case 102: side wall
102a: snap coupling portion 170: dead point prevention yoke
103: upper case 104, 108: air inlet
105: impeller 106: thrust plate
107: air outlet 110: stator
120: rotor 121: magnet
123; Back yoke 123a, 123c: receiving groove
123b, 123d: cylindrical portion 123e, 123f:
130, 130a: blade 140:
150: Sleeve bearing 160: Bearing holder
201a: Bridge 201b: Ring portion
E1-E4: End part J1, J2: Jumper line pattern
R1-R6: Through hole region R10: Outer space
S1-S5: Start portion T1-T7: Through hole
H1: Hall sensor

Claims (27)

A multilayer substrate laminated and integrated with through holes;
A coil pattern patterned on each substrate of the multilayer substrate; And
And a through hole formed through the multilayer substrate for connecting the coil pattern,
The coil pattern
Inner and outer rotation direction pattern portions arranged along the circumferential direction at intervals in an inner circumference and an outer circumference which are arranged concentrically with the through holes; And
And a radial direction pattern portion that connects the adjacent inner rotation direction pattern portion and the outer rotation direction pattern portion to each other and is disposed along the radial direction. The method according to claim 1,
Wherein the coil pattern has a plurality of protrusions and a plurality of recessed portions repeatedly formed according to the number of poles of the magnets. The method according to claim 1,
Wherein the coil pattern includes first to third coil patterns formed on first to third substrates sequentially stacked,
The first and third coil patterns are formed in the same shape and the second coil pattern is positioned at a position rotated around the through hole by a number of (360 占 / rotor magnetic pole number) in the first coil pattern. . The method of claim 3,
And a fourth substrate stacked on a lower portion of the third substrate,
And a plurality of electronic parts connected to the wiring pattern are mounted on an exposed surface of the fourth substrate, the wiring pattern being connected to the coil pattern to apply a driving current to the motor driving circuit. 5. The method of claim 4,
Wherein the coil pattern further includes fourth and fifth coil patterns formed on the fourth substrate,
And the fourth and fifth coil patterns are arranged in a line-symmetrical structure. The method according to claim 1,
Wherein the through hole is disposed in an area located between an outer peripheral part of the inner rotation direction pattern part and an inner peripheral part of the outer rotation direction pattern part and an outer area located outside the coil pattern when the coil pattern overlaps. 6. The method of claim 5,
And at least one jumper wire pattern connecting the fourth and fifth coil patterns. The method according to claim 1,
And a sensing coil formed on the first substrate of the multi-layer substrate for detecting a rotor rotation position. The method according to claim 1,
And the radiating pattern portion of the coil pattern is connected so that current flows in the same direction. The method according to claim 1,
Wherein the number of the radiation pattern portions is set to be equal to the number of the rotor magnetic poles, to be set to one-half of the number of the rotor poles and to be two times the number of the rotor poles. 11. The method of claim 10,
Wherein an angle between the adjacent radial pattern portions is 360 占 퐉 / n (where n is a number equal to the number of the rotor poles, 1/2 times the number of the rotor poles and two times the number of the rotor poles) Laminated stator for motor. A multilayer substrate laminated and integrated with through holes;
A plurality of coil patterns patterned in a spiral pattern on each substrate of the multilayer substrate so as to form a plurality of turns having two or more projections and recesses along the periphery of the through holes; And
And a plurality of through holes formed through the multilayer substrate for connecting the plurality of coil patterns,
The plurality of coil patterns
360 ° / n (where n is a number equal to the number of rotor poles, one-half of the number of rotor poles and two times the number of rotor poles), along the radial direction, A plurality of radial pattern portions for generating a rotational force in a tangential direction;
A plurality of inner rotation direction pattern portions interconnecting the inner sides of the adjacent radial pattern portions; And
And a plurality of outer rotation direction pattern portions interconnecting the outer sides of the adjacent radial pattern portions. A plurality of coil patterns patterned in a helical pattern are formed on respective substrates of the multilayer substrate having through holes so as to form a plurality of turns having two or more protrusions and recesses along the periphery of the through holes, At least one coil pattern layer connected by; And
And a drive circuit layer stacked on a bottom surface of the coil pattern layer and having a motor drive circuit for applying a drive current to the coil pattern,
The plurality of coil patterns
360 ° / n (where n is a number equal to the number of rotor poles, one-half of the number of rotor poles and two times the number of rotor poles), along the radial direction, A plurality of radial pattern portions for generating a rotational force in a tangential direction;
A plurality of inner rotation direction pattern portions interconnecting the inner sides of the adjacent radial pattern portions; And
And a plurality of outer rotation direction pattern portions interconnecting the outer sides of the adjacent radial pattern portions. 14. The method of claim 13,
Wherein the coil pattern layer has different coil patterns of the odd-numbered layer and the even-numbered layer. 15. The method of claim 14,
Wherein the odd-numbered layer coil pattern forms a winding in a clockwise (CW) direction from the inside to the outside, and the even-numbered layer coil pattern is formed so as to form a winding in a counterclockwise direction (CCW) from the inside to the outside. 14. The method of claim 13,
Wherein the coil pattern layer has the same coil pattern of all layers,
Wherein the odd-numbered layer coil pattern forms a winding in a clockwise (CW) direction from the inside to the outside, and the even-numbered layer coil pattern is formed so as to form a winding in a clockwise (CW) direction from the outside to the inside. 14. The method of claim 13,
Wherein a start portion and an end portion of the coil pattern are formed wider than a portion forming a coil, and at least one through hole and a soldering land surrounding the through hole are disposed. A rotating shaft;
A rotor having the rotating shaft supported at its center and having a plurality of N pole magnets and S pole magnets alternately arranged;
A bearing rotatably supporting the rotary shaft;
A bearing holder for receiving and fixing the bearing; And
And a laminated stator according to any one of claims 1 to 17, wherein a through hole through which the bearing holder passes is formed at the center. 19. The method of claim 18,
A dead point prevention yoke disposed at a lower portion of the stacked stator and having a polygonal corner in which the centers of the plurality of magnets are arranged opposite to each other when the rotor is in an initial state; And
And a hall sensor provided on the stator substrate and arranged at a position shifted by 1/4 magnetic pole width or 3/4 magnetic pole width from the boundary surface of the rotor magnetic pole in the initial state of the rotor to generate a rotor position detection signal ,
Wherein the Hall sensor is disposed at a position overlapping one of the radial pattern portions of the stator. 21. The method of claim 20,
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 pattern portion and is arranged to face the radial pattern portion. A plurality of N pole magnets and a plurality of S pole magnets alternately disposed in the outer periphery of the rotor;
A bearing rotatably supporting the rotary shaft;
A bearing holder for receiving and fixing the bearing;
A lower case for supporting the bearing holder;
A stacked stator in which a through hole through which the bearing holder passes is formed at the center and is supported by a lower case;
An upper case disposed opposite to the lower case; And
And a side wall connecting between the upper case and the lower case,
The stacked stator is the stacked stator according to any one of claims 1 to 17. 22. The method of claim 21,
The lower case
A ring portion formed at a center thereof with a through hole through which the bearing holder passes; And
And a plurality of bridges connecting the ring portion and the lower case body,
Wherein the plurality of bridges are formed in a number equal to the number of magnetic poles of the rotor (number of magnetic poles / 2) to have a dead point prevention yoke function. 23. The method of claim 22,
Further comprising a hall sensor provided on the stator substrate and arranged at a position shifted from the interface of the rotor magnetic pole by a 1/4 magnetic pole width or a 3/4 magnetic pole width in an initial state of the rotor to generate a rotor position detection signal,
Wherein the hall sensor is disposed at a position overlapping one of the radial pattern portions of the stator. 22. The method of claim 21,
The back yoke of the rotor
A coupling portion formed with a through hole through which a rotary shaft is fixed at a central portion and protruding inward;
A first cylindrical portion forming a first end receiving groove in which a bearing holder is accommodated;
A second cylindrical portion having a size corresponding to that of the stator, the second cylindrical portion having a second end receiving groove in which a plurality of magnets are installed outside; And
And a step portion connecting the first cylindrical portion and the second cylindrical portion,
Wherein the plurality of blades constituting the impeller are formed to extend at the same level as the second cylindrical portion while surrounding the second end receiving groove of the back yoke. 22. The method of claim 21,
The back yoke of the rotor
A coupling portion having a through hole through which a rotary shaft is fixed at a central portion;
A first cylindrical portion forming a first end receiving groove in which a bearing holder is accommodated;
A second cylindrical portion having a size corresponding to that of the stator, the second cylindrical portion having a second end receiving groove in which a plurality of magnets are installed outside; And
And a step portion connecting the first cylindrical portion and the second cylindrical portion,
Wherein the plurality of blades constituting the impeller are extended while surrounding the first end and the second end housing groove of the back yoke. 22. The method of claim 21,
A sirocco type cooling fan in which a wind inlet is formed in at least one of the upper case and the lower case and a wind outlet is formed in a part of the side wall. 22. The method of claim 21,
Wherein the upper case and the lower case have air inlet ports and air outlet ports, respectively.

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