KR101486084B1 - Fan motor - Google Patents

Abstract

     The present invention relates to a stator comprising a core, a coil for winding the core, a stator composed of an insulator for insulating the core and the coil from each other, A molding part formed to surround the outside of the stator; An upper bearing assembly and a lower bearing assembly respectively coupled to the upper and lower portions of the stator, and an upper bearing assembly and a lower bearing assembly, which are connected to a rotary shaft rotatably supported through the upper bearing assembly and the lower bearing assembly, Wherein the radius of the molding part is not less than a radius of the lower bracket of the lower bearing assembly to the fastening hole.

A fan motor, a stator assembly, a receiving groove,

Description

Fan motor {FAN MOTOR}

The present invention relates to a fan motor, and more particularly, to a fan motor that, when molding a stator, widens the molding structure radially to the lower bracket of the lower bearing assembly to prevent the chip from penetrating into the fan Motor.

Generally, a fan motor refers to a device for rotating a rotor by an electromagnetic interaction between a stator and a rotor and transmitting the rotational force to the outside. The fan motor is used as a means for blowing air by the rotational force of the rotor, and is widely used for a refrigerator, an air conditioner, a cleaner, and the like.

The motor is a device for rotating the rotor by electromagnetic interaction between the stator and the rotor and transmitting the rotational force to the outside. Here, the rotating force of the rotor drives the load through the rotating shaft.

Usually, the motor has an inner rotor type motor in which the stator is located outside, and an out-rotor type motor in which the stator is located in the inner side.

On the other hand, the stator includes a stator core and a coil wound around the stator core. Here, the stator core is electrically insulated from the coil through an insulator or a bobbin.

The rotation force of the rotor is transmitted to the rotary shaft, and the fan connected to the rotary shaft rotates. At this time, the vibration generated in the rotor is transmitted to the fan to generate noise, which results in lowering the durability of the fan motor.

A conventional fan motor in which a rotating shaft and a fan are coupled will be described with reference to the accompanying drawings.

1 is a view showing a conventional fan motor. In the conventional fan motor 1, a stator, a rotor, a coil, and the like are provided in a casing 20 which forms an outer appearance of the motor, and a rotating shaft connected to the rotor is connected to the outside of the casing 20. Accordingly, the end of the rotary shaft is connected to the fan 10 to form the fan motor 1. [

However, in this fan motor 1, the total volume of the fan motor becomes large. That is, the length from the casing 20 to the front of the fan 10 becomes longer, and the space occupied by the fan motor 1 becomes larger. Compactness is an important part of household electric appliances. If the size of the fan motor is large, space efficiency is lowered when the fan motor is mounted on other products.

In addition, the rotary shaft 30 is formed to be long so that it can not be balanced when it is coupled to the inside of the hub 12 of the fan. That is, it is also very important to concentrate the rotation shaft 30 and the fan 10. If the fan 10 is not concentric, noise is generated in the rotating fan 10, Which affects the durability of the fan 10 and the motor. Particularly, in the resonance state, the influence given to the rotor and the motor also increases.

      This is because the rotor and the fan rotate, it is difficult to fix the rotary shaft in the groove inside the hub of the fan, and the long rotary shaft 30 is hard to concentrate on the fan 10. [ Therefore, there is a problem that it is difficult to solve the noise and vibration generated when the fan 10 is fixed and rotated on the rotary shaft 30.

The present invention provides a fan motor in which a molding part covering the PCB of the stator assembly of the fan motor is formed up to the lower bracket coupling groove of the lower bearing assembly so that chips generated in the bolt and the lower bracket do not flow into the interior of the fan motor having permanent magnets .

The present invention relates to a stator comprising a core, a coil for winding the core, a stator composed of an insulator for insulating between the core and the coil, a molding part formed to surround the stator, an upper bearing assembly and a lower bearing assembly, And a fan connected to a rotating shaft rotatably supported through the upper bearing assembly and the lower bearing assembly and rotated integrally with the rotor at a radially outer side of the stator, the radius of the molding part being smaller than the radius of the lower bearing assembly And a coupling hole formed in the lower bracket.

Further, the present invention provides a fan motor, wherein the molding part includes a PCB formed with electrical patterns.

Further, the molding part has a receiving groove formed therein for receiving the fastening member when the lower bracket is coupled through the fastening hole by the fastening member.

In addition, the present invention provides a fan motor in which the fastening portion located at the molding portion forms an end in the direction of the lower bracket.

Further, the present invention provides a fan motor in which a gap exists between the lower bracket and the molding part to a part of a distance from the center of the stator to the receiving groove.

In addition, the present invention provides a fan motor in which a molding part forms a slot for connecting a PCB or a coil with an external power line or a control line.

The fan motor provided in the present invention can prevent the generation of noise by preventing the iron chips generated in the screw and the bracket from penetrating into the inside of the fan when the fan motor is coupled to the product.

In addition, the fan motor provided by the present invention can prevent the chips generated in the screw and the lower bracket from penetrating into the motor, thereby increasing the durability of the fan motor.

In addition, the fan motor provided by the present invention forms a receiving groove in the fastening portion to which the fastening means is fastened, so that the chip does not move because the chip is located only inside the receiving groove.

In addition, the fan motor provided in the present invention has a chip only inside the receiving groove, so that the chip does not flow into the inner diameter of the fan, thereby eliminating the noise caused by the chip.

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

2 is a perspective view showing the entire exploded view of the fan motor. Specifically, the fan motor 100 includes a stator generating electromagnetic interaction with the rotor 120 formed of the rotor frame 121 and the permanent magnet, an upper bearing assembly 140 coupled to the upper and lower portions of the stator, A lower bearing assembly 160, and a fan covering the stator and the upper bearing assembly 140.

The rotary shaft 130 is press-fitted into the shaft hole 115 of the fan hub 112 and supported by the upper bearing assembly 140 and the lower bearing assembly 160. One end of the rotary shaft 130 is connected to the fan hub 111, As shown in Fig.

The rotor 120 surrounds the stator in the radial direction and generates a rotational force by electromagnetic interaction with the stator. The permanent magnet 122 is attached to the inner circumferential surface of the rotor frame 121. At this time, the permanent magnet 122 may be coupled to the inner circumferential surface of the rotor frame 121 in a cylindrical shape, and may be discontinuously formed and attached like a rod magnet.

On the other hand, the inner circumferential surface of the rotor frame 121 may be formed in a stepped manner so that the permanent magnets 122 can be engaged. In addition, a rod-shaped position fixing step 115 may be formed in the stepped portion or the inner peripheral surface of the rotor frame 121 in the longitudinal direction to function as a stopper of the permanent magnet 122.

The rotor frame 121 may be integrally formed with the fan 110 inside the hub of the fan or may be joined by an adhesive means. And the permanent magnet 122 is engaged with the inner circumferential surface of the rotor frame to function as the rotor 120. [

Thus, the rotary shaft 130 is supported by the rotary shaft receiving portion 31 of the hub 112 to perform the function of holding the concentricity of the rotary shaft 130. The rotary shaft 130 is press-fitted into the rotary shaft receiving portion 31 of the rotor or joined by the adhesive means.

The stator includes a stator core 152, a coil wound around the stator core, and an insulator 151 for insulating the core and the coil. The insulator 151 is made of an insulating material and can be coupled to the upper and lower portions of the stator core 152. A coil is wound around the stator core 152 through the insulator 151, and insulation is provided between the stator core and the coil.

The fan motor 100 may include a PCB 153 to control the driving of the motor. Various electrical patterns are formed on the PCB 153, and the insulator 151 is coupled to the upper portion of the PCB 153. Insulation is provided between the core 152 and the PCB 153 through the insulator 151.

Further, it is preferable that the stator core 152, the insulator 151, the coil, and the PCB 153 are all combined and then they are all wrapped by the molding part 154. The stator assembly 150 in which the molding part 154 is formed can be protected from the external environment and shocks in a place such as a refrigerator where the humidity is high.

The upper bearing assembly 140 is pushed into the upper portion of the stator assembly 150 and includes an upper bracket 141 and a middle bracket 145 that cover the bearings 142 and the felt 143 including the oil and the bearings 144 ). The bearing 144 is preferably a sintered bearing 144, and more preferably an oilless bearing. The holder 142 is preferably formed radially with a slit for positioning or limiting the position of the bearing 144 and for circulating the oil contained in the felt 143 to the top of the bearing 144.

 In order to smoothly function the bearing 144, it is preferable that the bearing assembly 140 includes a felt 143 containing bearing oil. A bearing is provided on the inner side in the radial direction of the felt 143, and the bearing oil is supplied to the bearing 144 through the felt 143.

The lower bearing assembly 160 is substantially identical in shape and function to the upper bearing assembly 140. However, the lower bearing assembly 160 preferably further comprises a lower bracket 161 for engagement with the product. The lower bracket 161 has a plurality of engagement holes 167 for engagement with the product. The lower bracket 161 is formed with a slot 168 for connecting external wires to the PCB 153.

One end of the rotary shaft 130 is inserted into the shaft hole 115 of the hub 112 and the other end is passed through the lower bracket 161. In addition, a groove 131 is formed around the rotating shaft 130. In this groove, the stop ring 132 and the oil cutters 133 and 135 are fitted. The stop ring 132 fixes the position of the fan and may be located inside or outside the shaft hole 115. The oil cutters 133 and 135 of the fan hub are in close contact with the upper bracket 141 and the lower bracket 161 to ride the rotary shaft 130 to prevent the bearing oil from being scattered.

The fan 110 receives the rotational force transmitted by the rotor and rotates to blow air. The rotary shaft 120 is fitted to the shaft hole 115 in a forced press-fitting manner, and an adhesive means can also be applied to enhance the coupling force. The shaft hole 115 forms an end portion in the outward direction of the fan 110 so that one end of the rotation shaft can be coupled and supported to hold the concentricity of the shaft. In addition, a rotating shaft receiving portion 131 capable of supporting the rotating shaft 130 is formed in the inner side direction of the fan hub 112 to support the rotating shaft.

3 is a view showing an insulator and a core combined. 4 is an exploded view of a stator assembly and a bearing assembly.

First, the stator assembly includes a core 152 and an insulator 151. A coil is wound around the core 152 through the insulator 151 and insulation is provided between the core 152 and the coil. The insulator 151 is made of an insulating material and can be coupled to the upper and lower portions of the core 152. In addition, the core 152 and the insulator 151 may be integrally formed by injection molding, and the core 152 may be press-fitted into the insulator 151. [

A PCB 153 having electrical elements mounted thereon may be connected to the stator. The PCB 153 controls driving of the motor, and various electrical components are coupled. The stencil mask 153 may be coupled to the upper or lower portion of the stator, and electrically insulated through the insulator 151 in combination with the stator. The insulator 151 may include a coupling portion 156 for coupling with the PCB 153.

The insulator 151 is provided with a coupling part 156 for coupling with the PCB 153 and fixing the PCB 153 through the coupling part 156. At this time, the coupling part may be formed in various shapes, for example, a rod-shaped projection 156, a hook shape, and the like. A plurality of bar-shaped protrusions are formed, and holes are formed in the PCB 153 to correspond to the protrusions. The rod-like projection 153 can be press-fitted into the hole or bonded by bonding. The rod-shaped hooks are hook-shaped and have a plurality of hooks so that they have a sufficient binding force. Also, the hooks are engaged with the circular arc formed at the center of the PCB 156 without bonding. Thereby forming a key hole 158 in the longitudinal direction in the insulator inner diameter. The keyhole 158 serves as a reference point for winding the coil on the core in the three-phase motor.

The stator and the PCB 153 thus formed are preferably covered by mold injection. Fan motors are used in various fields such as refrigerator, air conditioner, ventilator, etc. In case of exposure to watery space or external environment, they are short-circuited or damaged. Thus, the molding part 154 is surrounded to protect the stator and the PCB 153 from moisture or external pressure. The molding part 154 may be formed in various shapes and materials, and may be entirely covered except the core 152 part.

The upper end of the molding part 154 that surrounds the PCB 153 may form a depression 154a which is formed at a portion corresponding to the rotor frame when the stator assembly 150 is engaged with the rotor frame In the circumferential direction. The depression 154a is formed to prevent water from entering the stator assembly 150.

When the hub of the fan covers the stator assembly 150, the gap between the inner surface of the hub of the fan and the molding part 154 becomes narrow. At this time, it is preferable to form the chamfered portion 154b in the molding part 154 because noise may occur during rotation of the fan.

The bearing assemblies 140 and 160 are coupled to the upper and lower portions of the stator assembly 150 enclosed by the molding part 154. The bearing assemblies 140 and 160 are press-fitted into the inner diameter of the stator assembly 150. The upper bearing assembly 140 fitted to the upper portion of the stator assembly 150 is coupled to the position fixing portion 157 formed on the upper portion of the stator assembly 150. [ The upper bearing assembly 140 is fixed by the position fixing portion 157 without skidding or twisting.

The lower bearing assembly 160 is press-fitted into the lower portion of the stator assembly 160. An intermediate bracket 165 of the lower bearing assembly 160 is inserted into the inner diameter of the stator assembly 150 and a plurality of coupling holes 167 are formed in the lower bracket 161 to be attached to the product. In addition, a slot 168 is formed to accommodate electric wires for connection with the PCB 153.

5 is a cross-sectional view of the stator assembly and bearing assembly. The molding part 154 of the stator assembly 150 is covered up to the fastening part 167 'of the lower bracket 161. In addition, the fastening portion 167 'may have an end portion in the direction of the lower bracket 161 and may be in contact with the lower bracket 161 to support the fastening portion 167'. The fan motor is coupled to the product by fastening means such as bolts 170 through fastening holes 167 of the lower bracket 161. The fastening portion 167 'may be formed with a receiving groove 155 to receive the fastening member. The receiving groove 155 may be formed simply as a recessed cylindrical shape and may be formed so that a screw can be fitted in correspondence with the thread of the bolt 170. Therefore, the chips generated in the bolts 170 or the lower bracket 161 cover the fastening holes 167 of the molding part 154 to prevent the chips from entering the inner diameter of the fan. Further, by forming the receiving groove 155 in the molding part 154, the chips move only in the receiving groove 155, so that the chip is not moved.

In addition, the molding part 154 forms an end in the direction of the lower bracket 161 from the fastening part 167 ', and the end part is continuously formed in the circumferential direction. Such an end acts as a stopper when fastened to the lower bracket 161 and does not apply pressure to the PCB 153 inside the molding part 154, thereby protecting the PCB 153. The molding part 154 is spaced apart from the lower bracket 161 by a predetermined distance t from the center of the stator assembly 150 to the fastening part 167 ' Pressure is not applied to the PCB 153 due to the interval t, and the PCB 153 is protected.

6 is a perspective view showing the stator assembly. The molding portion 154 of the stator assembly 150 is formed to cover the fastening holes 167 of the lower bracket 161 in the radial direction. The molding part forms a depression 154a and a chamfer 154b and covers the lower bracket 161 and corresponds to the shape of the slot 168 of the lower bracket 161. [ Thus, the fastening means is received in the receiving groove 155 of the molding part 154 of the stator assembly 150, so that chips generated in the fastening means and the lower bracket 161 are not introduced into the motor.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. It is therefore intended that such variations and modifications fall within the scope of the appended claims.

1 is a view showing a general fan motor.

Fig. 2 is a view showing the entire disassembly of the fan motor according to the present invention.

3 is a view showing a combination of an insulator and a core according to the present invention.

FIG. 4 is an exploded view of a stator assembly and a bearing assembly of a fan motor according to the present invention.

5 is a view illustrating a combination of a stator assembly and a bearing assembly according to the present invention.

6 is a view illustrating a combination of a stator assembly and a bearing assembly according to the present invention.

Claims (6)

A stator comprising a core, a coil for winding the core, and an insulator for insulating the core and the coil from each other; An upper bearing assembly and a lower bearing assembly respectively coupling to the upper and lower portions of the stator; A molding part covering at least a part of the stator; And a fan connected to a rotating shaft rotatably supported through the upper bearing assembly and the lower bearing assembly and rotatably formed integrally with the rotor at a radially outer side of the stator, wherein a radius of the molding part is smaller than a radius of the lower bracket assembly Wherein the molding part has a fastening part that contacts the lower bracket and covers the fastening hole of the lower bracket, and a space except the fastening part has a predetermined distance from the lower bracket.        The method according to claim 1, Wherein the molding part comprises a PCB on which electrical patterns are formed.        3. The method according to claim 1 or 2, Wherein the molding portion is formed with a receiving groove for receiving the fastening member when the lower bracket is coupled through the fastening hole by the fastening member.        The method of claim 3,       Wherein the fastening portion is formed continuously in the circumferential direction. delete 3. The method according to claim 1 or 2, Wherein the molding part forms a slot for connecting the PCB or the coil to an external power line or a control line.

Images