JPS5939821Y2 - external rotor motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an external rotor electric motor, and particularly to a rotation support structure for a squirrel cage rotor thereof.

Electric sirocco fans used in air conditioning equipment, etc.Since the scirocco fan is attached to the motor shaft outside the drive motor, it occupies a large space, making the structure larger.
This causes high costs.

For this reason, it is advantageous to incorporate the drive motor as an external rotary type inside the sirocco fan, since the space it occupies is reduced.

However, conventional external rotor type electric motors generally have a structure as shown in Figure 1.

That is, on the fixed part side, the armature core 2 is fixed to the fixed shaft 1, and the sun wire 4 of the armature winding 3 is connected to the shaft 1.
Bring it out through the inside.

On the other hand, on the rotating part side, a frame 6 is fitted and fixed to the outer periphery of the iron core 5 of a cage-shaped rotor equipped with an end ring 10 on the inner diameter side, and is connected to this with bolts 8 through the left and right brackets 7. A bracket 7 is supported on the fixed shaft 1 by a ball bearing 9.

According to the above-mentioned conventional structure, since the cylindrical outer surface of the frame 6 extends over the entire length of the rotating part, not only does the outer diameter of the motor become large over the entire length, but also heat generated within the motor is transferred from the iron core 5 through the frame 6. Since the heat is dissipated to the outside, the temperature of the motor increases, and since the frame 6 is an essential structural member, it becomes expensive.

In particular, when the external rotor motor with the above structure is incorporated into a sirocco fan, the impeller 11 and frame 6 of the sirocco fan
Not only does the ventilation resistance become large because the ventilation passage 12 between the frame 6 and the frame 6 becomes narrow, but also the surface wind generated near the circumferential surface due to the rotation of the frame 6 has a large circumferential component and a large absolute value. Therefore, the theoretical calculation of the characteristics of the blower is greatly disturbed, and as a result, the Q-H characteristics of the sirocco fan are greatly affected, and the fan itself has to be made larger.

The purpose of this invention is to eliminate the above-mentioned conventional drawbacks and to propose an external rotor motor suitable for blowers such as sirocco fans. By directly connecting the bracket to the annular body that has a fitting part on the end ring or its extension, it is possible to significantly reduce the outer diameter of the electric machine, improve cooling, and significantly improve the performance of the blower. This is what we are trying to measure.

The configuration of the present invention will be described with reference to an embodiment shown in FIGS. 2 and 3.

However, the same reference numerals as in FIG. 1 indicate the same components.

In the present invention, the frame 6 in the prior art is not used, but a bracket 7 is fixed to the annular body 5 integrated with the conductor bar to support the rotor.

In the embodiment shown in FIG. 2, the soil sit ring 13 is extended into a cylindrical shape in the direction of the rotation axis, and an extension shaft 14 according to the present invention is used.
is formed, and a bracket fitting part 15 is provided at the end thereof to form an annular body 5 as a whole.

The outer periphery of the bladder 7 is fitted and fixed here. 16 is a lock washer.

It is best to make the outer diameter of the end ring 13 as small as possible without impairing the electrical characteristics. Fortunately, since the extension 14 also acts as an end ring, for example, the conductor bar 17 and its height can be made integral. can be formed to bond to.

Furthermore, in order to allow the armature core 2 to be inserted into the rotor during assembly, the minimum inner diameter of at least one of the openings of the extension part 14 extending from the end ring 13 is larger than the outer diameter of the armature core. Formed at the same time using Guicast so that

In another embodiment shown in FIG. 3, an annular body K is formed by subjecting the end ring 13a to a spigot process.

Attach the flange 18 of the bowl-shaped bracket 7a to this,
They are connected with bolts 19.

According to the above structure, the outer diameter of both ends of the rotating part is much smaller than the outer diameter of the rotor core.
When installed in the center of a centrifugal blower, the ventilation passage 12a becomes wider than before, dramatically reducing fluid resistance in this area, and at the same time reducing the surface air generated by the rotation of the rotating part, improving the performance of the sirocco fan. This has the effect of making the entire fan more compact.

In addition, the conventional frame 6 is no longer necessary, and the annular body replacing it is formed integrally with the conductor bar by gui-casting, which, together with the miniaturization of the bracket, has the effect of greatly reducing costs.

Furthermore, internally generated heat is dissipated directly to the outside air from the surface of the rotor core and the annular body integrated with the conductor bar, resulting in better cooling performance, lower temperature rise, and further miniaturization of the outer size by saving on the core and windings. and cost reduction.

In addition, since the bracket supporting the rotor is fixed to the annular body formed integrally with the conductor bar, it is easy to center the rotating part to obtain an accurate gap length, and electrical
Mechanically, it has many benefits as an electric motor for blowers, such as reducing vibration and noise during operation.

[Brief explanation of drawings]

FIG. 1 is a partial vertical sectional view of a conventional outer rotor type electric motor, and FIGS. 2 and 3 are partial vertical sectional views showing different embodiments of the present invention. 1... Fixed shaft, 7... Bracket, 13... End ring, 14...
Extension part, X... Annular body.

Claims (1)

[Scope of utility model registration request] In an external rotor type motor in which an armature is arranged in the inner hole of a cylindrical squirrel-cage-shaped quantum trochanter, the end ring of the end ring of the squirrel-cage-shaped quantum trochanter is provided at the axial center of a blower impeller. Alternatively, an annular body is provided with a fitting part at the end of an extension part that is die-cast integrally with the end ring and extends in the axial direction, and a bracket rotatably attached to the fixed shaft is provided in the fitting part. The rotor is removably fixed, and the inner diameter of the annular body is slightly larger than the outer diameter of the armature, and the outer diameter of the annular body and the bracket is sufficiently smaller than the outer diameter of the rotor core. An external rotor electric motor.