JPS5835021B2 - Kaitenden Kinorei Kiyakouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling device for a rotating electrical machine, and more particularly to a cooling device for a rotating electrical machine suitable for a DC machine equipped with a rectifier.

Conventionally, small and medium-sized rotating electric machines are cooled by ventilation by providing intake or exhaust windows at both ends of the outer periphery of the frame.

In particular, in DC machines, taking into account the cooling around the commutator and the sliding characteristics of the brushes, the intake cooling air passes around the commutator, passes around the armature and between the magnetic poles of the stator, and is installed in the frame on the opposite side of the commutator. The structure is such that the air is exhausted from the exhaust window.

However, when air is blown from the intake window with an external blower, the intake window is located at one location, making it difficult to uniformly cool the entire area of the commutator.

In other words, the cooling air taken in from the intake holes provided on the outer periphery of the frame does not flow uniformly around the commutator due to the fan action accompanying the rotation of the commutator and the presence of the brush holder. The brush holder is cooled well, but since the cooling air is difficult to reach the brushes and brush holder on the opposite side of the intake window, local heating occurs, and only the temperature of the brushes, brush holder, and commutator increases. Not,
The current situation is that local heating has an adverse effect on the sliding characteristics of the brushes that affect rectification.

Here, the cooling air taken in from the intake window is blown directly to the commutator, but at commutator positions that do not correspond to the intake window, the cooling effect is reduced because the cooling air is blocked by the brush holder.
The temperature rise is 10 to 20 degrees Celsius higher than the commutator position, reaching nearly 150 degrees Celsius in some cases.

As a result, the sliding properties of the brush deteriorate, which has an adverse effect on rectification.

On the other hand, in the windings on the stator side, there is a lot of cooling air between the poles close to the intake window, but there is less cooling air between the poles far from the intake window. This also results in localized heating in the windings.

For this reason, the output performance was poorer than that of electric motors with the same body path.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cooling device for a rotating electric machine that eliminates the drawbacks of the prior art described above and can uniformly cool the rectifier and the windings of each part.

The present invention relates to a cooling device for a rotating electric machine, in which a rocker of a brush holder is configured in a substantially cylindrical shape, a rocker ventilation window is provided between the mounting part of the rocker and the brush holder, and the other end of the rocker and a yoke are provided. The structure is such that the area around the brush sliding part is actively cooled by providing a shielding plate between the brush and the brush.

Embodiments of the present invention will be described below based on the embodiments shown in FIGS. 1 to 3. Reference numeral 1 denotes a rotor composed of a shaft 2, a commutator 3, an armature core 4, and an armature winding 5. Bearing 6
, 61 to the stator 7.

The stator 7 includes a cylindrical yoke 8 and end brackets 9, 91.
The armature core 4 is provided on the inner circumferential surface of the yoke 8.
A main pole iron core 10 and a main pole winding 11 are attached to the main pole iron core 10 and a main pole winding 11 facing each other with a small gap therebetween, and an appropriate number of intake windows 12 and exhaust windows 13 are provided on both sides thereof.

One intake window 12 is connected to a blower 15 via a communication pipe 14.

Next, the rectifier section will be explained. Reference numeral 16 is a brush that is pressed against the commutator 3 by a spring 17 and is held in a brush holder 18, and the holder 18 is fixed to a rocker 19.

To explain the rocker part in detail with reference to FIG. 3, the rocker 19 has a substantially cylindrical shape, and a fixing base 20 having a brush mounting hole is formed on the same circumference in the almost central part, and this is used to hold the brush. The container 18 is fixed with screws.

A ventilation window 21 is formed between the brush mounting position and the rocker fixing collar 22, and is used as a cooling passage together with the ventilation window 24 of the shielding plate 23 provided at the other end.

It is preferable that the shielding plate 23 be formed separately and then combined, but the invention is not necessarily limited to this.

Further, the rocker fixing collar 22 may also be unnecessary if the rocker itself is thick.

The rocker having such a configuration has one end disposed on the inner surface of the end bracket 9, and is fixed by tightening the bolt 25 into the screw hole 26, and the other end is also guided by the shielding plate 23 and stably fixed.

Note that 27 in the figure is an iron core having an auxiliary winding 28.

In such a configuration, when the electric motor is driven, the blower 15 is driven in synchronization with it.

Then, outside air is introduced through the intake window 12, and some of it passes through the rocker ventilation window 21 to cool the brush holder 18 and to the commutator 3.
It passes in the axial direction between the outer periphery of the rotor 1 and the brush holder 18 , and flows to the exhaust window 13 through the outer periphery of the rotor 1 and between the poles of the main pole winding 11 of the stator.

Also, a part of the cooling air flows through the ventilation window 24 of the shielding plate 23 to each winding 1.
1.28, cooling the stator windings and exhausting the exhaust window 1.
It is discharged from 3.

Here, since the outer periphery of the commutator 3 is covered with a cylindrical rocker 19, the cooling air is not affected by the fan action of the rotor, and the cooling air from the intake window 24 easily enters the rocker ventilation window 21. Since the commutator 3 and the brush holder 18 are cooled by cooling air in the axial direction, ventilation resistance is small and the cooling effect is increased.

Therefore, the temperature rise of each winding and each brush becomes uniform,
It is expected that the temperature of the brush part will be lowered by 10 to 20 degrees Celsius.

As described above, according to the present invention, it is possible to simplify the structure and easily prevent abnormal heat generation in the rectifier section and the stator winding section.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a sectional view of the electric motor, FIG. 2 is a sectional view taken along the line 1--2 of FIG. 1, and FIG. 3 is a perspective view of the rocker. Explanation of symbols: 1...Rotor, 7...Stator, 12...Intake window, 16...Brush, 18... Brush holder, 19...
Locker, 21...Rocker ventilation window, 23...
...Block plate, 24...Block board ventilation window.

Claims (1)

[Claims] 1. A brush holder that holds brushes, a rocker that supports the brush holder and is fixed to the inner surface of an end bracket, and forced cooling means that introduces cold air into a rectifier section that includes the brushes, In the rotating electrical machine with a rectifying device that cools the rectifying device section and the armature section by one cooling air passage, the rocker has a substantially cylindrical shape and has a brush of the commutator device section at one end of the rotating electrical machine on a side opposite to the armature. It is characterized by being equipped with a ventilation window for introducing cooling air into the electric isogo part through the sliding part, and also comprising a shielding plate having a ventilation window between one end of the non-fixed side and the yoke. Cooling equipment for rotating electric machines.