JPH11210700A - Fan motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To actualize a fan motor which can exclude any factor caused by application of heat to bearings, therefore, any factor attributed to the degradation in life of lubricant sealed in the bearings by effectively cooling electronic components disposed in the inside of a stator frame, concurrently, sealing the ventilation of air high in temperature to the side of a motor, and restraining the stator frame supporting the bearings from being raised high in temperature. SOLUTION: In this fan motor, a first through hole 1-3 is provided for a space close to the outer circumferential surface of a bearing holding part at the bottom part 1-22 of a stator frame 1-2 packaging not only an electric motor 2 but also a control circuit 5 drivingly controlling the aforesaid motor, and concurrently, a second through hole 1-2 is provided for a place close to the inner circumferential surface at the circumferential wall of the same bottom part 1-22, these holes are turned out to be ventilating holes for an electronic component 5-2, the circuit substrate 5-1 of the control circuit 5 and a sealing member sealing ventilation to the side of the stator and a rotor, are placed side by side in the inner surface of the stator frame 1-2, and it is so constituted that the electronic component high in exothermic heat out of the electronic components forming the control circuit 5 are disposed in an area faced to the first through hole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan motor, and more particularly to a fan motor in which a control unit for driving an electric motor is housed and arranged inside a frame.

[0002]

2. Description of the Related Art FIGS. 3 and 4 are a sectional view and a plan view of an example of a conventional fan motor. As shown in FIG. 3, an electronic component 5-2 constituting a control circuit 5 mounted together with the electric motor 2 inside the stator frame 1-2 of the fan motor.
Are the peripheral wall 1-21, the bottom 1-22, the bearing holder 1-23 of the stator frame 1-2, and the stator 2-1 of the electric motor.
Circuit board 5-surrounded by the rotor and the rotor 2-2
1, the heat generated by the motor itself and the heat transmitted from the motor 2 side, the ambient temperature conditions around the electronic components are severe, and aggressive ventilation with the outside air is required. 3, a through hole 1-3 is provided in the stator frame bottom 1-22 as shown in FIG. 3, and outside air flowing from the through hole 1-3 is supplied from the control circuit 5 to the stator 2-1 and the rotor 2 of the electric motor 2. -2 through the gap between the stator frame peripheral wall 1-2
1 through the gap between the outer peripheral surface of the rotor 1 and the inner peripheral surface of the rotor frame cylindrical portion 3-1 in which the fan blades 4 are implanted. Is well known.

When the fan motor 4 is energized, the air inside the stator frame 1-2 that has risen due to the heat generated by the electronic components 5-2 of the control circuit 5 together with the electric motor 2 is turned into a venturi ventilation passage by the rotation of the fan blades 4. When air flows toward the discharge port 1-52 side at 1-5, the root portion of the fan blade 4 and thus the stator frame peripheral wall portion 1-
End 1 between rotor 21 and rotor frame cylindrical portion 3-1
At -53, the air is sucked toward the discharge ports 1-52 due to the viscosity of the air, so that a negative pressure is applied to the outside air.

As described above, the inside of the stator frame 1-2 has a negative pressure with respect to the outside air, so that the gap between the stator frame 1-2 and the rotor frame cylindrical portion 3-1 and the end portion 1-33.
, Through the motor 2 and the control circuit 5, the stator frame bottom 1
-22, the air flows into the stator frame 1-2 along with the inflow of outside air from the through holes 1-3 described above, and this flow is cooled by the outside air, It has a cooling function for the heat-generating electronic component 5-2.

[0005]

In the above-mentioned conventional structure, the ventilation passage extending from the through hole 1-3 to the gap end 1-33 between the stator frame 1-2 and the rotor frame 3 is formed. Therefore, there is a cooling effect in the outside air on the heat generated by the electronic component 5-2 and the electric motor 2 as the purpose, but the cooling air of the electronic component 5-2, which generates a large amount of heat, becomes a flow of high-temperature air. Stator frame 1 exposed to air
2, the bearing 8 fitted and held on the outer peripheral surface of the bearing holding portion 1-23, that is, the inner surface thereof, is heated.
The lubricating material sealed in the bearing 8 was a factor of shortening the service life.

[0006]

SUMMARY OF THE INVENTION A fan motor according to the present invention comprises a motor and a control circuit for controlling the driving of the motor. Along with the through-hole, a second axial through-hole is provided in the vicinity of the inner peripheral surface of the peripheral wall portion at the same bottom, and these serve as ventilation holes for the electronic components. A sealing member for blocking ventilation to the stator and the rotor side is provided together with the circuit board, or an electronic component that generates a large amount of heat among electronic components constituting the control circuit is disposed in the first through hole facing portion. It is configured to

In the configuration of the present invention as described above, by the operation of the fan motor, the flow of air toward the discharge port side in the venturi ventilation passage causes the second axial through hole formed in a portion near the ventilation passage to pass through. Since the air inside the stator is sucked out, the inside of the stator frame becomes negative pressure, so that air flows in from the first axial through hole formed in a portion near the center of the bottom of the stator frame. While removing the heat of the electronic component to be cooled, the second component passes through the second axial through-hole along the surface of the circuit board or the sealing member without flowing to the stator or the rotor side of the electric motor. And discharges the hot air inside to the outside.

[0008]

1 is a sectional view of an example of a fan motor according to the present invention, and FIG. 2 is a plan view thereof.

As is apparent from comparison with the above-described prior art example shown in FIGS. 3 and 4, a feature of the present invention is that the axial through hole provided in the stator frame bottom 1-22 has a conventional structure. In addition to the first axial through hole 1-3 near the bearing holding portion 1-23 of the stator frame 1-2, the stator frame peripheral wall portion 1 at a position close to the venturi ventilation passage 1-5 Second axial through hole 1 close to -21
-4 is provided, and a sealing member 6 is provided along with a circuit board 5-1 constituting the control circuit 5, so that the outside air flowing from the first axial through-holes 1-3 is supplied to the stator frame 1-1. 2 is shielded so as not to flow into the side of the electric motor 2.

The above-mentioned sealing member 6 is provided on the circuit board 5-in FIG.
1 and the inner peripheral surface of the stator frame peripheral wall portion 1-21 are complementarily sealed, but covers the entire inner peripheral surface of the peripheral wall portion 1-21. As described above, the member may be provided so as to overlap with the circuit board 5-1.

In the examples shown in FIGS. 1 and 2, six first axial through holes 1-3 and one second axial through hole 1-4 are provided.
Although the number and arrangement of each are shown, the first axial through holes 1-3 are formed in the bearing holding portions 1 of the stator frame 11-2.
It is optional except that the center side close to −23 and the second axial through hole 1-4 are arranged outside close to the peripheral wall part 1-21.

Further, since the electronic component 5-2 to be cooled also generates a large amount of heat, it goes without saying that in order to efficiently cool the electronic component 5-2, the cooling effect of the electronic component 5-2 generating a large amount of heat needs to be enhanced. Therefore, it is also effective to arrange the electronic component 5-2 having particularly large heat generation in the vicinity of the inner facing surface of the first axial through hole 1-3 which is the cooling air inlet for this purpose. is there.

[0013]

The fan motor according to the present invention effectively cools the electronic components disposed inside the stator frame and does not ventilate the high-temperature air that has cooled the electronic components to the motor side. This does not increase the heating of the bearing inserted and held in the bearing, and has the effect of suppressing the high temperature which is a cause of the deterioration of the life of the lubricant sealed in the bearing.

[Brief description of the drawings]

FIG. 1 is a sectional view of an example of a fan motor according to the present invention.

FIG. 2 is a plan view of the example of FIG.

FIG. 3 is a cross-sectional view of an example of a conventional fan motor.

FIG. 4 is a plan view of the example of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Venturi 1-1 Cylindrical outer peripheral wall 1-2 Stator frame 1-21 Peripheral wall 1-22 Bottom 1-23 Bearing holding part 1-3 First axial through hole 1-4 Second axial through hole 1-5 Ventilation path 1-51 Suction port 1-52 Discharge port 1-53 Gap end 2 Motor 2-1 Stator 2-2 Rotor 3 Rotor frame 3-1 Cylindrical section 4 Fan blade 5 Control circuit 5- DESCRIPTION OF SYMBOLS 1 Circuit board 5-2 Electronic component 6 Sealing member 7-1 Air flow 1 7-2 Air flow 2 7-3 Air flow 3 7-4 Air flow 4 8 Bearing

Claims (3)

[Claims] 1. A venturi, a stator frame integral with the venturi, and a stator fixedly held on an inner peripheral surface of a peripheral wall portion of the stator frame, the fitting being inserted into a bearing holding portion of the stator frame. An electric motor having a rotor rotatably supported by bearings, a fan blade integrally formed with a rotor frame and fixedly held to the rotor,
In a fan motor which is provided together with a stator inside the stator frame and includes a circuit board and a control section comprising electronic components mounted thereon, a first portion is provided at a position near an outer peripheral surface of a bearing holding section at the bottom of the stator frame. And a second through hole in the vicinity of the inner peripheral surface of the peripheral wall at the same bottom.
The axial direction through-hole is provided, and these form the ventilation hole for cooling the said electronic component, The fan motor characterized by the above-mentioned. 2. The stator according to claim 1, further comprising a sealing member for blocking air flow to the stator and the rotor together with the circuit board of the control unit inside the stator frame. The described fan motor. 3. The fan according to claim 1, wherein an electronic component that generates a large amount of heat among the electronic components forming the control unit is disposed at the first through hole facing portion. motor.