JP2000345992A - Brushless fan motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve dustproof performance, a drip-proofing property, and productivity of a brushless fan motor. SOLUTION: This brushless fan motor is provided with a fan rotor 1, bearings 2 supporting the fan rotor 1, a stator winding 3, a printed board 5 with electronic parts, and a housing whose central part 9 having a holding part of the bearings is bonded with a bottomed shape part 8 covering a external case part 7 of an axial flow fan and the printed board 5 by a spoke 10. The printed board 5 is placed in the bottomed shape part 8 of the housing, the stator winding 3 is placed apart from the printed board 5 by the bottomed shape part 8 of the housing and connected to the printed board 5, and a circuit coating treatment is applied by filling a coating agent 12 in the bottomed shape part 8 of the housing which houses the printed board 5 with electronic parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brushless fan motor having dustproof or dripproof performance and used for cooling and ventilating various devices.

[0002]

2. Description of the Related Art The main application of a brushless fan motor is generally for cooling office equipment such as printers and copiers that are used indoors. Its applications, such as fan fans, are expanding.

[0003] On the other hand, however, fan motors used in outdoor equipment and vehicle-mounted fan motors are required to have dust-proof performance or drip-proof performance that has not been required in conventional applications.

Hereinafter, a conventional brushless fan motor will be described. FIG. 3 shows the structure of a conventional brushless fan motor. In FIG. 3, 1 is a fan rotor, 2 is a bearing, 3 is a stator winding, 4 is an electronic component, 5 is a printed circuit board on which the electronic component 4 is mounted, and 62 is a housing. The printed circuit board 5 on which the electronic components 4 are mounted,
The housing 62 is disposed adjacent to and connected to the stator winding 3.
And is not facing the outer surface of the brushless fan motor.

However, there is a gap between the fan rotor 1 and the bottomed portion of the housing 62. Therefore, the printed board 5 on which the internal electronic components 4 are mounted has a structure in which the printed board 5 is exposed to the outside air. Dust and dew directly adhere to the substrate 5, which may lead to circuit failure.

[0006]

Since brushless fan motors for office equipment do not have any special requirements for dust-proof performance and drip-proof performance due to the usage environment, they are generally not specially designed. is there. Therefore, if dust or water droplets adhere to the circuit board, there is a possibility that a malfunction or failure of the circuit may occur.

On the other hand, fan motors used for outdoor equipment and fan motors for vehicles are required to have dustproof performance or dripproof performance.

[0008] In order to improve the dust-proof performance or drip-proof performance of the circuit section, it is common to apply a coating agent on the circuit section. In order to apply the coating agent on the circuit board, it is necessary to apply the coating agent on the circuit board during the assembly process of the brushless fan motor, which takes a lot of man-hours and at the same time manufactures on a consistent automatic assembly production line Was difficult. In addition, there is also a problem that the coating agent flows and is fixed before the applied coating agent is hardened, thereby causing contact with the fan rotor.

An object of the present invention is to solve such a conventional problem and to improve the dustproof performance and dripproof performance of a brushless fan motor, and to improve the production efficiency.

[0010]

According to the present invention, there is provided a brushless fan motor comprising: a fan rotor; a bearing for supporting the fan rotor; a stator winding;
A brushless fan including a printed circuit board on which electronic components are mounted, and a housing having a structure in which an outer case portion of the axial flow fan, a bottomed portion that covers the printed circuit board, and a central portion having a bearing holding portion are connected by spokes. In the motor, the printed circuit board is arranged in the bottomed shape portion of the housing, the stator winding is arranged separately from the printed circuit board by the bottomed shape portion of the housing, and connected to the printed circuit board, and the printed circuit board on which the electronic components are mounted is mounted. A circuit coating process is performed by filling the bottomed shape portion of the housed housing with a coating agent.

According to the present invention, the brushless fan motor can be coated at the end of the assembly process of the brushless fan motor, and the brushless fan motor having improved dustproof performance and dripproof performance without lowering the production efficiency. Can be manufactured.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to solve the above-mentioned problems, the present invention provides a fan rotor, a bearing for supporting the fan rotor, a stator winding, a printed circuit board on which electronic components are mounted, and an external fan. In a brushless fan motor including a housing having a structure in which a case portion, a bottomed shape portion that covers a printed circuit board, and a center portion having a bearing holding portion are connected by spokes, the printed circuit board is disposed in the bottomed shape portion of the housing. The stator winding is arranged at a distance from the printed circuit board by the bottomed shape portion of the housing, and is connected to the printed circuit board, and a coating agent is applied to the bottomed shape portion of the housing containing the printed circuit board on which the electronic components are mounted. By filling, a circuit coating treatment was performed.

Since the printed circuit board on which the electronic parts are mounted is exposed to the outside, the coating agent can be filled at the end of the production process of the brushless fan motor. Production can be performed in the same process as the production process of the fan motor, without reducing the production efficiency. Further, the structure is such that the coating agent is poured into the bottomed shape of the housing, and the stator winding has the housing. Since it is arranged separated from the printed circuit board by the bottom shape part, the coating agent flows out to an unnecessary position before the coating agent is fixed, and it is fixed to the outer periphery of the stator winding etc. At the same time that the possibility of defects in the coating process such as , It is possible to enhance the dustproof performance and drip-proof performance of the brushless fan motor by a coating process of the circuit.

Further, a fan rotor, a bearing for supporting the fan rotor, a stator winding, a printed circuit board on which electronic components are mounted, an outer case portion of the axial flow fan, a bottomed portion for covering the printed circuit board, and In a brushless fan motor having a housing having a structure in which a center portion having a holding portion of a bearing is connected by spokes, a printed circuit board is arranged in a bottomed shape portion of the housing, and a stator winding is printed by the bottomed shape portion of the housing. By placing a coating agent in the bottomed shape portion of the housing in which the printed circuit board on which the electronic components are mounted is connected to the printed circuit board and arranged separately from the board,
Circuit coating was applied.

The printed circuit board on which the electronic components are mounted is formed in a shape having a feature that there is no hole for allowing the holding portion of the bearing to escape, and the holding portion of the bearing is formed in the bottomed shape portion of the housing. The brushless fan motor arranged so as to cover and hide has a structure in which a printed board on which electronic components are mounted is exposed to the outside.

Since the structure is such that the coating agent can be filled at the end of the production process of the brushless fan motor, the production can be performed in the same process as the production process of the brushless fan motor which does not require the circuit coating. Without lowering, furthermore, the structure is such that the coating agent is poured into the bottomed shape portion of the housing, and the stator winding is arranged separately from the printed circuit board by the bottomed shape portion of the housing, so that the coating agent is Until the fixing, the coating agent flows out to an unnecessary position and is fixed to the outer peripheral portion of the stator winding, so that a problem in the coating process such as occurrence of contact with the fan rotor portion and the like can also be solved. At the same time, the coating process of the circuit improves the dustproof performance of the brushless fan motor. Out is possible to increase the drip-proof performance.

Further, the printed circuit board on which the electronic components are mounted is formed in a shape having a feature that there is no hole for allowing the holding portion of the bearing to escape, and the holding of the bearing in the bottomed shape portion of the housing. Since the components are arranged so as to cover them, it is possible to secure a wide area in which electronic components can be mounted. Therefore, it is possible to easily mount a circuit on a small brushless fan motor.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1 In FIG. 1, 1 is a fan rotor, 2 is a bearing for supporting the fan rotor, 3 is a stator winding, 4 is an electronic component, and 5 is a printed circuit board on which the electronic component 4 is mounted. Reference numeral 6 denotes a housing. The housing 6 is connected to an outer case portion 7 of the axial fan, a bottomed portion 8 covering the printed circuit board 5 and a central portion 9 having a holding portion of the bearing 2 by a plurality of spokes 10. It is formed with a structure. The printed circuit board 5 is arranged in the bottomed shape portion 8 of the housing 6, the stator winding 3 is arranged separated from the printed circuit board 5 by the bottomed shape portion 8 of the housing 6, and the printed circuit board 5 and the connection pins 11 are provided. To form a brushless fan motor. Thereafter, a circuit coating process is performed by filling a coating agent 12 into the inside of the bottomed shape portion 8 of the housing 6 in which the printed circuit board 5 on which the electronic component 4 is mounted is accommodated.

By doing so, it is not necessary to apply a coating agent on the circuit board during the assembly process of the brushless fan motor, so that it does not require much man-hour and does not require circuit coating. The production can be performed in the same process as the production process of the brushless fan motor, and the production of the brushless fan motor coated with the circuit in the integrated automatic assembly production line becomes possible. Further, in order to adopt a method of pouring the coating agent 12 into the bottomed shape portion 8 of the housing 6, the filled coating agent 12 hangs down before being hardened, and is fixed to the outer peripheral surface of the stator winding 3, and the like. Problems such as hitting can be solved. At the same time, it is possible to realize a brushless fan motor with improved dustproof performance and drip-proof performance.

Further, in this brushless fan motor, since the bottomed shape portion 8 filled with the coating agent 12, the electronic component 4 to be coated, and the printed circuit board 5 are outside the brushless fan motor, the coating agent 12 As for the type, a type such as an ultraviolet curing acceleration type can be selected, and the number of production steps can be further reduced.

(Embodiment 2) In FIG. 2, 101 is a fan rotor, 21 is a bearing for supporting the fan rotor, 3 is a stator winding, 4 is an electronic component, and 51 is a printed circuit board on which the electronic component 4 is mounted. Reference numeral 61 denotes a housing. The housing 61 is connected to the outer case portion 7 of the axial fan, the bottomed portion 81 covering the printed circuit board 51, and the central portion 9 having the holding portion of the bearing 21 by a plurality of spokes 10. It is formed with a structure. Printed circuit board 51
Are arranged in the bottomed portion 81 of the housing 62, the stator windings 3 are arranged separately from the printed board 51 by the bottomed shaped portion 81 of the housing 61, and are connected to the printed board 51 by the connection pins 111. To form a brushless fan motor. Thereafter, a circuit coating process is performed by filling a coating agent 212 into the inside of the bottomed shape portion 81 of the housing 61 in which the printed circuit board 51 on which the electronic component 4 is mounted is accommodated.

The basic components are the same as those in FIG. The difference from FIG. 1 is that the printed circuit board 51 on which the electronic component 4 is mounted is formed in a shape having no hole for allowing the holding portion of the bearing 21 to escape, and is formed in the bottomed shape portion 81 of the housing 61. This is a point that the bearing 21 is arranged so as to cover the holding portion.

By adopting the above configuration, it is not necessary to apply a coating agent on the circuit board during the assembly process of the brushless fan motor as in the first embodiment, and therefore, a great deal of man-hour is required. Therefore, the production can be performed in the same process as the production process of the brushless fan motor which does not require the circuit coating, and the production of the brushless fan motor with the circuit coating in the integrated automatic assembly production line becomes possible. Further, in order to adopt a method of pouring the coating agent 212 into the bottomed-shaped portion 81 of the housing 61, the filled coating agent 212 hangs down before being hardened and is fixed to the outer peripheral surface of the stator winding 3, so that the coating agent 212 is connected to the fan rotor 1. Problems such as hitting can be solved. At the same time, it is possible to realize a brushless fan motor with improved dustproof performance and drip-proof performance.

In the configuration of this brushless fan motor, a bottomed-shaped portion 81 filled with a coating agent 212,
Electronic component 4 and printed circuit board 5 to be coated
Since 1 is outside the brushless fan motor, the type of the coating agent 212 can be selected from a type such as an ultraviolet curing acceleration type, and the number of production steps can be further reduced.

Further, according to this embodiment, a large area in which the electronic components 4 can be mounted can be ensured, so that the electronic components can be easily mounted on a smaller brushless fan motor by single-side mounting. can do.

[0027]

As is clear from the description of the above embodiment,
According to the first aspect of the present invention, there is no need to apply a coating agent on the circuit board during the assembly process of the brushless fan motor, so that the brushless fan motor does not require a large number of steps and does not require a circuit coating. The production can be performed in the same process as the production process of the fan motor, and the brushless fan motor with the circuit coating can be manufactured in the integrated automatic assembly production line.
Also, since the coating method is used to pour the coating agent into the bottomed part of the housing, the filled coating agent hangs down before it cures and sticks to the outer peripheral surface of the stator windings, causing problems such as contact with the fan rotor. Can also be eliminated. At the same time, it is possible to realize a brushless fan motor with improved dustproof performance and drip-proof performance.

Further, in the configuration of the brushless fan motor, since the bottomed shape portion for filling the coating agent, the electronic component to be coated, and the printed circuit board face the outside of the brushless fan motor, the type of the coating agent is also limited. In addition, it is also possible to select a type such as an ultraviolet curing acceleration type, which has a feature that the number of production steps can be further reduced.

According to the second aspect of the present invention, in addition to the above-mentioned effects of the first aspect of the present invention, it is possible to further secure a wider area on which electronic components can be mounted. Mounting of electronic components on the brushless fan motor can be easily performed by single-side mounting.

[Brief description of the drawings]

FIG. 1 is a structural diagram of a brushless fan motor according to a first embodiment of the present invention.

FIG. 2 is a structural diagram of a brushless fan motor according to a second embodiment of the present invention.

FIG. 3 is a structural diagram of a conventional brushless fan motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 101 Fan rotor 2, 21 Bearing 3 Stator winding 4 Electronic component 5, 51 Printed circuit board 6, 61, 62 Housing 7 Outer case part 8, 81, 82 Bottom shape part 9 Center part 10 Spoke 11, 111, 112 Connection pin 12, 212 Coating agent

Claims (2)

[Claims] 1. A fan rotor, a bearing for supporting the fan rotor, a stator winding, a printed board on which electronic components are mounted, an outer case portion of an axial fan, and a bottomed shape that covers the printed board. A brushless fan motor comprising a housing and a housing having a structure in which a central portion having a bearing holding portion is connected by spokes, wherein a printed circuit board is disposed in a bottomed shape portion of the housing, and a stator winding is provided in the housing. By filling the bottomed shape portion of the housing, in which the printed circuit board on which the electronic component is mounted, is coated with a coating agent, the bottom shape portion is arranged to be separated from the printed board by the bottom shape portion, and is connected to the print board, Brushless fan motor characterized by circuit coating. 2. A printed circuit board on which electronic components are mounted,
The brushless fan motor according to claim 1, wherein the brushless fan motor is formed in a shape having no hole for allowing a holding portion of the bearing to escape, and is arranged so as to cover the holding portion of the bearing in a bottomed shape portion of the housing.