JPS5915248Y2 - Flat motor cooling system - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a cooling device for a flat motor.

Generally, as shown in FIG. 1, a flat motor 1 attracts a bracket 4 by the magnetic force of a permanent magnet 3 that is in close contact with a cover 2, and a flat disk-shaped armature is installed in a housing 5 constituted by the cover 2 and the bracket 4. 6 is rotatably provided, and a brush 7 contacts this armature 6.
A fan 9 is rotated via a rotor shaft 8 connected to the armature 6 by supplying a current.

In such a flat motor 1, there are mechanical friction parts such as the brush 7 and the armature 6, the rotor shaft 8 and the bearing 10, and frictional heat is generated here, and the brush 7 also generates heat as power is supplied.

Therefore, in this motor, the treatment of heat trapped within the housing 5 is an extremely important issue.

As a conventional heat dissipation method, the above-mentioned fan 9 is used.
Either change the configuration of the duct so that a part of the airflow hits the motor housing 5, or use a fan 9 that draws air into the fan, such as a sirocco fan, and use this drawn air to blow the entire motor. There are some that are designed to cool the air.

However, this method only carries away the heat from the outer peripheral surface of the motor, but does not actively draw out and radiate the heat generated inside the motor.

Furthermore, recently proposed devices include those in which louvers are cut directly into the bracket or cover.

Although this has a high cooling effect, the mold used for production is expensive, and even though flatness is required for the cover and bracket, the louver impairs the flatness.

Therefore, this invention was made in view of the above-mentioned drawbacks.
A cover having a permanent magnet on the inner surface is covered with a bracket to form a sealed housing, and within this housing, a flat disk-shaped armature is rotatably provided opposite to the magnet with a slight gap. In a flat motor that rotates a fan via a rotor shaft connected to the armature by supplying current from contacting brushes, cooling air is applied to either or both of the bracket or the cover by the rotation of the fan. The attached heat transfer fin is composed of a corrugated fin with a louver, and the corrugated fin is provided in an annular shape on the surface of a bracket, etc., and is held between the inner peripheral edge of the heat transfer fin, the fin pressing piece, and the bracket, etc. Accordingly, an object of the present invention is to provide a cooling device that has good assembly workability and takes advantage of the large heat dissipation effect of corrugated fins.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cooling device for a flat motor according to the present invention will be described below with reference to the drawings.

FIG. 2 is a partially sectional front view of the cooling device 11, FIG. 3 is a perspective view of the heat transfer fins 12 incorporated in the cooling device 11, and FIG. 4 is a vertical sectional view of the main part of FIG. In each figure, the same members as those shown in FIG. 1 are given the same reference numerals.

This cooling device 11 is connected to the bracket 4 of the flat motor 1.
Heat transfer fins 12 are fixed to the flat motor 1, and airflow from a fan 13 is applied to the fins to cool the flat motor 1.

As shown in FIG. 4, this flat motor 1 has a housing 5 consisting of a cover 2 and a bracket 4, and an armature 6 is rotatably supported within this housing 5 by a bearing 14. A permanent magnet 3 made of a magnetic material such as iron and fixed to the cover 2 side.
This is what attracts this.

When power is supplied from a brush 7 to a flat disc-shaped armature 6 located between the bracket 4 and the permanent magnet 3, the armature 6 starts rotating.

In particular, in the present invention, the bracket 4 is caulked to the case 15 of the bearing 14, and a fin pressing piece 16 is also attached here together with the bracket 4, so that the fin 12 provided in contact with the bracket 4 can be pressed by this pressing piece 16. I try to apply pressure.

Moreover, a plurality of small through holes 17 are formed in the bracket 4 so that the heat inside the housing 5 can escape to the outside.

Therefore, the heat generated in the housing 5 of the flat motor 1, that is, the frictional heat between the brush 7 and the armature 6, and the heat generated by passing electricity through the brush 7, is directly radiated from the heat transfer fins 12 via the bracket 4. Alternatively, the air is transmitted to the heat transfer fins 12 or the outside air through the through holes 17, and the air is carried away by the fan 13.

Here, the heat transfer fins 12 may be made of a plurality of ordinary thin plate-shaped ones and protruded from the bracket 4, but since this requires time and effort for assembly, etc., annular corrugated fins as shown in FIG. 3 are used. This is desirable.

In particular, if the louvers 18 are cut and raised on the corrugated fins, the heat dissipation effect will be even better.

That is, as shown in FIG. 2, the air from the fan 13 hits the bracket 4 of the flat motor 1 perpendicularly and flows along the surface of the bracket 4.

In this case, if the corrugated fins are formed into an annular shape with radial ridges and arranged over the entire surface of the bracket 4, the distance between the fins will increase from the inside toward the outside, and the wind will be In areas where the heat radiation area is large, the fins are fully in contact with the fins, and in the inner areas where the heat radiation area is small, the fins are slightly hit, so that the heat radiation performance is uniform throughout the bracket, and various adverse effects due to heat are not caused.

Furthermore, almost the entire corrugated fin is always directly exposed to cooling air from the fan, so its heat dissipation is extremely high.

Furthermore, by providing the corrugated fins over the entire bracket, the corrugated fins serve as various filters, thereby preventing dust and the like from entering the inside of the motor.

Although the above-described embodiment has been described with reference to the case where the heat transfer fins 12 are provided on the bracket 4 side, it goes without saying that the heat transfer fins 12 may be provided on the cover 2 side or on both the bracket 4 and the cover 2. .

The press pieces 16 shown in FIGS. 5 to 7 are improved from those shown in FIGS. 4, etc., and the press piece shown in FIG. A through hole 19 is provided in the tip portion 16a, thereby allowing the fin 12 to be held more completely.

In the case shown in FIG. 6, a fin pressing piece 16 is formed by cutting and raising a part of the bracket 4, and after placing the fin 12 on the bracket 4, the pressing piece 16 is bent to attach the fin 12 to the bracket 4. This is what I did.

This eliminates the need to separately form through holes 17 and 19.

In the case shown in FIG. 7, the pressing piece 16 on the outer peripheral end of the housing 5 is not attached to the housing 5 by welding or the like as in the case shown in FIG. It is installed.

As is clear from the above description, according to the present invention, heat transfer fins are attached to either or both of the motor cover and the bracket, thereby dissipating the heat of the housing, so that the flat motor can be cooled quickly. The cooling can be carried out more efficiently by opening holes in the bracket or by cutting and raising louvers in the heat transfer fins.

Furthermore, with the above motor, a motor with high cooling effect can be obtained without changing the duct, and since the motor can be installed in any location, it is easy to design various equipment such as car coolers. It will be played.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a conventional flat motor, FIG. 2 is a front view showing an embodiment of the cooling device according to the present invention, FIG. 3 is a perspective view of heat transfer fins incorporated in the cooling device, and FIG. 4 is a longitudinal sectional view of the main part of FIG. 2, and FIGS. 5 to 7 are longitudinal sectional views of the main part showing other embodiments of the present invention. 2...Cover, 3...Permanent magnet, 4.
...Bracket, 5 ...Housing, 6
... Armature, 7 ... Brush, 8
...Rotor shaft, 11 ... Cooling device, 12 ... Heat transfer fins, 13 ... Sirocco fan, 14 ... Bearing, 15・・・・・・
・Case, 16... Pressing piece, 17...
Through hole, 18...louver.

Claims (1)

[Claims for Utility Model Registration] 1. A cover having a permanent magnet on the inner surface is covered with a bracket to form a sealed housing, and within this housing, a flat disc-shaped armature is disposed opposite to the magnet with a slight gap. In a flat motor which is rotatably provided, and a fan is rotated via a rotor shaft connected to the armature by supplying current to the armature from a brush, a bracket or cover is exposed to cooling air by the rotation of the fan. The heat transfer fins attached to one or both of the above are constructed of corrugated fins with louvers, and are formed in an annular shape so that the ridge lines of the corrugated fins are radial, and are arranged over the entire surface of the bracket, etc. A cooling device for a flat motor, in which at least an inner peripheral edge of a heat transfer fin is held between a fin pressing piece and the bracket or cover. 2. The cooling device for a flat motor according to claim 1, wherein the fin pressing piece is formed by cutting and raising a part of the bracket or cover.