KR101595119B1 - Outer rotor type fan motor - Google Patents

Abstract

The present invention relates to an outer rotor type method of forming an injection hole in a printed circuit board for injection of a mold resin for coupling an insulator of a stator to a printed circuit board, A fan motor comprising: an insulator formed in a cylindrical shape on an inner circumferential surface of a stator; a printed circuit board bonded to the insulator in a stator direction at one end of the insulator, the printed circuit board having a power source mounted thereon; And an injection hole for injecting the mold resin is formed adjacent to one end of the insulator. The outer rotor type fan motor according to claim 1,

Outer rotor, rotor, stator, insulator, printed circuit board, molded resin

Description

Outer rotor type fan motor {OUTER ROTOR TYPE FAN MOTOR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer rotor type fan motor including a rotor and a stator, and more particularly, to a fan motor of an outer rotor type including a rotor and a stator by forming an injection hole in a printed circuit board for injection of a mold resin for coupling a stator insulator and a printed circuit board And more particularly, to an outer rotor type fan motor that allows a stator and a printed circuit board to be tightly coupled in an accurate and easy manner.

2. Description of the Related Art [0002] Generally, a blower fan applied to a refrigerator is driven by an inner rotor type motor in which a rotor installed in a stator rotates, thereby circulating and supplying cold air into a refrigerator .

The motor transmits the rotational force of the rotor to the outside by the electromagnetic interaction between the stator and the rotor, and the rotational force is transmitted through the rotational shaft.

The stator generally comprises a stator core and a coil wound around the stator core. At this time, the stator core is electrically insulated from the coil through the insulator.

On the other hand, in a recent fan motor, an outer rotor type fan motor capable of reducing the radial and axial dimensions of the refrigerator in consideration of the installation space of the refrigerator is applied.

1 is a longitudinal side view showing a conventional outer rotor type fan motor. As shown, the outer rotor type fan motor 10 generally comprises a lower bearing member 2, a stator 3 attached to the lower bearing member 2, an upper bearing member 4 attached to the stator 3, A rotor 6 centered on a rotary shaft 5 rotatably supported by the bearing members 2 and 4 and a fan unit 7 provided on the outer periphery of the rotor 6.

Specifically, the rotor 6 includes a rotor frame 8 made of a galvanized steel sheet and disposed on the outer circumferential surface of the stator 3 so as to be spaced apart in the form of a cylindrical cup, and a magnet 9 attached to the inner peripheral surface of the rotor frame 8 ). The magnet 9 is inserted and fixed to the rear end side of the inner circumferential surface of the rotor frame 8. Then, one end of the rotary shaft 5 is fixed to the center of one end of the rotor 6 in such a manner that it is press-fitted.

With such a configuration, an outer rotor type fan motor (hereinafter referred to as " outer rotor type fan motor ") in which the rotating shaft is rotatably supported by the bearing members 2 and 4 and the magnets 9 are spaced apart from the outer circumferential surface of the stator 3 10).

The pan portion 7 is made of a synthetic resin material and is integrally formed by inserting the rotor frame 8 and injecting a molten material and molding the same. The fan section 7 mainly comprises a hub section 7a covering the outer periphery of the rotor frame 8 and a wing section 7b extending in the radial direction.

Here, the rotor is rotated by the mutual electromagnetic action between the stator 3 and the rotor 6, and the hub coupled to the rotor rotates together with the rotor 6, so that the fan unit 7 rotates.

2, the stator 3 of the motor includes a core 33 and an insulator 32 to which the coil 34 is wound. The terminal of the core 33 is connected to the printed circuit board 31 Solder is connected.

Although not shown in the drawing, the printed circuit board 31 is fixed to the upper or lower portion of the stator through a separate fixing means.

In general, the fixing means of the stator 3 and the printed circuit board 31 are made of a mold resin. The mold resin serves as a fixing means. On the other hand, in order to protect the semiconductor chip and the circuit pattern from the outside, Respectively.

In the conventional outer rotor type fan motor 10, the stator 3 and the printed circuit board 31 are fixed to each other in the process of injecting the mold resin to join the stator 3 and the printed circuit board 31, The core and the coil are prevented from flowing into the inside of the coil due to insufficient injection at the coupling part of the core and the electric insulation function.

Further, due to the vibration caused by the continuous operation of the motor, the coupling force between the printed circuit board 31 and the stator 3 is weakened, so that they are separated from each other or even separated. Further, when the coupling between the printed circuit board 31 and the stator 3 is weakened, unexpected vibration may occur.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems of the prior art, and it is an object of the present invention to provide an outer rotor type fan motor capable of enhancing the mechanical coupling force between the stator and the printed circuit board, The purpose is to do.

It is another object of the present invention to provide an outer rotor type fan motor capable of further increasing the mechanical coupling force between the printed circuit board and the stator, while maintaining a constant engagement position.

It is another object of the present invention to provide an outer rotor type fan motor having a structure in which a printed circuit board is not damaged by a combination of a lower bracket assembly and an insulator.

According to an aspect of the present invention, there is provided a stator comprising: an insulator formed in a cylindrical shape on an inner circumferential surface of a stator; a printed circuit board coupled to the insulator in a stator direction at one end of the insulator, And an injection hole for injecting a mold resin is formed adjacent to one end of the insulator, wherein the injection hole for injecting the mold resin is formed adjacent to the printed circuit board. Thus, the coupling process between the printed circuit board and the stator can be easily and accurately performed.

In addition, the present invention provides an outer rotor type fan motor, wherein the injection hole is formed along an outer circumference of one end of an insulator coupled to a printed circuit board. Therefore, the mold resin can flow down along the outer surface of the insulator, and the insulating function is excellent.

Also, the present invention provides an outer rotor type fan motor, wherein the radius from the center of the printed circuit board to the outermost portion of the injection hole is larger than the outer diameter of the one end of the insulator coupled with the printed circuit board. Thus, the mold resin can flow only along the outer surface of the insulator.

In addition, the present invention provides an outer rotor type fan motor including an insertion protrusion formed at one end of an insulator coupled to a printed circuit board and an insertion hole formed in a printed circuit board. Therefore, the engagement position of the insulator and the printed circuit board can be always made constant, and the bonding force can be increased.

Further, there is provided an outer rotor type fan motor in which three insertion protrusions and insertion holes are formed along the outer peripheral surface of one end of the insulator.

Further, the present invention is characterized in that the bracket is inserted into the inner diameter of the one end of the insulator, and the inner surface of the bracket in the stator direction is in contact with the mold resin surrounding the printed circuit board. Therefore, the bracket does not come into direct contact with the printed circuit board, and the damage of the circuit can be prevented.

The outer rotor fan motor includes a bracket inserted into the inner diameter of the one end of the insulator, and the inner surface of the bracket in the stator direction is separated from the mold resin surrounding the printed circuit board. Also, in this case, one end of the insulator coupled to the bracket is further protruded in the bracket direction than the mold resin surrounding the printed circuit board. Therefore, the printed circuit board does not come into contact with the bracket, so that the terminals and the elements can be prevented from being damaged, and the vibration can be reduced.

With the outer rotor type fan motor according to the present invention configured as described above, the injection process of the mold resin for insulation and mechanical coupling between the printed circuit board and the insulator can be more accurately performed, and the production process is facilitated. The insulating function is excellent.

In addition, the outer rotor type fan motor according to the present invention can prevent the printed circuit board from being damaged by press-fitting of the bracket, thereby preventing damage due to continuous use of the fan motor.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a plan view illustrating a state where the stator and the printed circuit board are coupled to each other according to the present invention, and FIG. 4 is an enlarged plan view showing a coupling portion shown in FIG.

The printed circuit board 310 of the outer rotor type fan motor according to the present invention is integrally formed with the insulator 320 instead of being formed as a separate component in the housing or the bracket. As a result, the electrical connection between the printed circuit board and the coil becomes more stable and the elements of vibration and friction become smaller, which is an advantage of the outer rotor type fan motor. That is, the stator 300 is disposed at the center of the motor rotation shaft, a rotor (not shown) is disposed around the stator, and the printed circuit board 310 is integrated with the stator, The mechanical and electrical stability is improved.

The printed circuit board 310 is composed of a terminal, a printed circuit, and a power source, and functions to control the electrical flow of the BLDC motor. The electrical insulation of the printed circuit board 310 is achieved by a mold resin surrounding the printed circuit board 310. The mold resin surrounds the outer surface of the printed circuit board 310 with a predetermined thickness and similarly surrounds the core 33 and the coil 34 shown in FIG.

In addition, the printed circuit board 310 and the insulator 320 are mechanically coupled with the electrical insulation by the mold resin. The mold resin is made of a liquid viscous material. During the bonding process, the mold resin flows and hardens to enclose the printed circuit board 310 and the insulator 320 together.

The insulator 320 is formed in a hollow shape so that a rotating shaft (not shown) and a bracket for supporting the bearing member can be inserted into the insulator 320. The printed circuit board 310 also has a hole corresponding to the hollow shape of the insulator 320 . The mold resin is molded so as not to flow into the bracket inserting holes of the printed circuit board 310 and the insulator 320.

The structure for injecting mold resin into the printed circuit board 310 according to the concept of the present invention is such that the injection hole 350 is formed at one end of the insulator 320 at a position where the printed circuit board 310 is coupled to the insulator 320 Respectively. More specifically, the injection hole 350 is formed along the outer periphery of one end of the insulator 320, and forms a predetermined space for allowing the mold resin to flow along the outer circumferential surface of the insulator 320.

More specifically, the radius from the center of the printed circuit board 310 to the outermost portion of the injection hole 350 is formed to be larger than the outer diameter of the one end of the insulator 320 coupled with the printed circuit board 310, 320 and the outermost portion of the injection hole 350 becomes a space for injection of the mold resin.

In order to increase the coupling force between the printed circuit board 310 and the insulator 320, an insertion protrusion 351 is formed at one end of the insulator 320 and an insertion hole 352 is formed in the printed circuit board 310 at a position corresponding thereto. . Accordingly, after the insertion protrusion 351 is inserted into the insertion hole 352 to fix the position before the injection of the mold resin, the molding process proceeds. Accordingly, it is possible to prevent the coupling position of the printed circuit board 310 and the insulator 320 from being deviated during the molding process, so that the coupling can be always performed at a predetermined position.

In addition, the mechanical coupling force of the printed circuit board 310 and the insulator 320 is increased by the insertion protrusion 351 and the insertion hole 352. Since the coupling force in the circumferential direction is increased by the insertion protrusion 351 and the insertion hole 352, it is possible to prevent the coupling from being easily released by the vibration due to the operation of the fan motor.

A plurality of insertion protrusions 351 and insertion holes 352 are formed along the distal end surface of one end of the insulator 320, and preferably three protrusions 351 and three insertion holes 352 are formed. Needless to say, the positions or the numbers of the insertion protrusions 351 and the insertion holes 352 can be variously applied according to the shape of the insulator 320 and the printed circuit board 310 and the injection method of the mold resin. For example, one end of the insulator 320 may be formed so as to protrude more than the printed circuit board 310. In this case, the insertion protrusion 351 and the insertion hole 352 may be formed on the printed circuit board 310, And may be formed on the outer periphery of the inner housing or the insulator 320.

On the other hand, a hole (not shown) is formed in the center of the terminal 341 so that an end portion of the coil wound around each phase (u, v, w) of the stator 300 can be inserted. The upper portion of the terminal is formed of a metal plate so as to be electrically connected through soldering and a hole is formed in the center so that the coil 340 can be inserted. The coil 340 is inserted through the lower portion of the terminal hole, And is pulled toward the groove 342.

The pulled portion of the coil 340 is pulled down from the upper portion of the guide groove 342 to the lower portion so as not to interfere with the other portion while rotating. Accordingly, a portion of the coil 340 to be in contact with the terminal 341 is soldered to conform to the shape of the terminal 341.

At this time, it is preferable that the contact area between the terminal 341 and the coil 340 is as wide as possible so as to ensure the reliability of electrical connection. Therefore, the shape of the terminal 341 is preferably long in the radial direction. This ensures not only the reliability of the electrical connection but also the reliability of the mechanical connection so that the vibration of the motor does not damage the contact area or make the connection incomplete.

It is preferable that the terminals 341 are elongated in the direction of the guide grooves 342 and more preferably the elongated shapes of the terminals 341 and the guide grooves 342 when viewed from above the printed circuit board 310 It is more preferable to arrange them in the radial direction. As a result, a series of processes of fitting and fixing the coil in the guide groove 342 and soldering is more accurate and easier.

In the process of soldering the coil 340 wound around the stator 300, the operator pulls the coil 340 in the radial direction and the downward direction at the corner of the outer diameter of the printed circuit board 310, As shown in FIG. The portion of the coil 340 that is in contact with the terminal 341 is soldered and the remaining portion of the coil 340 is cut at the lower end of the printed circuit board 310 using a tool such as a nipper.

At this time, the remaining portions of the coils 340 should be formed with sufficient spacing between the terminals and the grooves so as not to interfere with the rest of the other coils 340 and the power elements and the like.

Preferably, a groove is formed at a corner of the outer diameter of the printed circuit board 310 so that the coil 340 can be stretched downwardly therebetween. More preferably, the terminal 341 is elongated in the direction of the groove. As the distance between the outer diameter end of the terminal and the groove is shortened, the remaining portion of the unblown coil can be minimized and contact with undesirable other portions can be prevented.

Thus, by arranging the coils 340 and the terminals 341 in the circumferential direction of the printed circuit board 310, the interval between the coils 340 and the terminals 341 is maximized, thereby minimizing the possibility of electrical interference. In addition, by forming the guide groove 342 in the printed circuit board 310, the soldering of the coil to the terminal 341 can be more accurately performed. In addition, since the terminal 341 is elongated in the direction of the guide groove 342, the contact area with the coil 340 can be sufficiently secured, thereby assuring the reliability of the electrical connection. In addition, since the coil 340 can be cut at the lower end of the printed circuit board 310, damage to the printed circuit board 310 during the cutting process can be prevented.

5 and 6 illustrate another embodiment of the method of coupling the printed circuit board 310 and the insulator 320 in the outer rotor type fan motor according to the present invention.

The lower bracket assembly 200 is inserted into the hollow portion of the insulator 320 described above. The lower bracket assembly 200 includes an inner extension portion inserted into the insulator 320, a lower bearing 210 supporting the rotation shaft, and a felt 220 lubricating the friction between the bearing and the rotary shaft while impregnating the oil. The upper bracket assembly 400 coupled to the other end of the insulator 320 also includes an inner extension, an upper bearing 410, and a felt 420.

The mold resin serves to insulate the printed circuit board 310 while protecting the substrate and the power devices from vibration and shock. The lower bracket assembly 200 may be formed to be in contact with the mold resin surrounding the printed circuit board 310, but may also be formed to be spaced apart. Accordingly, since the inner extension of the lower bracket assembly 200 is press-fitted into the insulator 320, damage due to pressure applied while the inner surface of the lower bracket assembly 200 in the stator direction comes into contact with the mold resin .

More specifically, one end of the insulator 320 is formed with a protrusion 321 that protrudes further in the direction of the lower bracket assembly 200 than the printed circuit board 310. Thus, the surface of the lower bracket assembly 200 facing the insulator 320 is in contact with the protruding portion 321 and spaced apart from the other surfaces. Due to the protrusion 321 of the insulator 320 thus formed, it is possible to prevent the substrate from being damaged when the lower bracket assembly 200 is pressed into the insulator 320, So that the reliability of operation can be assured.

With the outer rotor type fan motor according to the present invention configured as described above, the injection of the mold resin for the insulation and mechanical coupling between the printed circuit board and the insulator can be accurately performed, the production process becomes easier, There is an advantage that the function is excellent. In addition, the outer rotor type fan motor according to the present invention can prevent damage to the printed circuit board due to the bracket, and can prevent damage due to continuous use of the fan motor.

In the foregoing, the present invention has been described in detail based on the embodiments and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the content of the following claims.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing an example of a conventional fan motor of an outer rotor type. FIG.

2 is a view showing an example in which a stator and a printed circuit board according to the related art are combined.

3 is a view illustrating an example in which a stator and a printed circuit board are combined according to the present invention.

Fig. 4 is an enlarged view of the coupling portion of Fig. 3; Fig.

5 is a view showing still another example of the stator according to the present invention

FIG. 6 is a view showing an example of a combination of the stator and the bracket assembly of FIG. 5;

Claims (8)

An outer rotor type fan motor including a rotor and a stator, An insulator formed in a cylindrical shape on an inner peripheral surface of the stator; A printed circuit board coupled to the insulator from one end of the insulator to the stator and having a power supply; A bracket inserted into the inner diameter at one end of the insulator; And, A mold resin surrounding the printed circuit board and coupling the insulator to the printed circuit board, An injection hole for injecting a mold resin is formed adjacent to one end of the insulator, Wherein the inner surface of the bracket in the stator direction is in contact with a mold resin surrounding the printed circuit board. The method according to claim 1, Wherein the injection hole is formed along an outer periphery of one end of the insulator that engages with the printed circuit board. 3. The method according to claim 1 or 2, Wherein a radius from the center of the printed circuit board to the outermost portion of the injection hole is larger than an outer diameter of one end of the insulator coupled with the printed circuit board. The method according to claim 1, An insertion protrusion formed at one end of the insulator coupled to the printed circuit board; And, And an insertion hole formed in the printed circuit board. 5. The method of claim 4, Wherein the insertion protrusions and the insertion holes are formed along the outer circumferential surface of one end of the insulator. delete An outer rotor type fan motor including a rotor and a stator, An insulator formed in a cylindrical shape on an inner peripheral surface of the stator; A printed circuit board coupled to the insulator from one end of the insulator to the stator and having a power supply; A bracket inserted into the inner diameter at one end of the insulator; And, A mold resin surrounding the printed circuit board and coupling the insulator to the printed circuit board, An injection hole for injecting a mold resin is formed adjacent to one end of the insulator, Wherein one end of the insulator coupled to the bracket is formed with a protrusion that is further projected in the bracket direction than the printed circuit board. 8. The method of claim 7, And the inner surface of the bracket in the stator direction is spaced apart from the surfaces other than the projecting portion.

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