KR860001587Y1 - Carbon brush - Google Patents

Abstract

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Description

Carbon brush

Figure 1 is the carbon brush currently in use.

FIG. 2 and FIG. 3 show a carbon brush of the present invention, and FIG. 2 shows a needle-shaped rod-like carbon surrounded by an insulator to form a brush.

Fig. 3 is a plate-shaped brush made by stacking several sheets of carbon plates between insulators.

4 is a conventional Slydax model for explaining the characteristics of the brush.

5 is an enlarged view of the carbon brush surface and the coil surface of the existing Slidax.

6 is an enlarged view of the carbon brush (wape plate type) and the slidax coil of the present invention.

* Explanation of symbols for main parts of the drawings

V: Insulator J: Carbon Conductor

J ': Bundle of carbon conductor T: Terminal

The present invention relates to a carbon brush to reduce the calorie generated from the brush contact terminal portion without the need for a heat sink to solve the mechanical and electrical wear of the contact surface.

Brashes are indispensable for motors and slidaxes, and they are widely used because they have low electrical contact resistance, relatively low friction and are ideal for electrical arcs.

Conventionally, the specific resistance of the carbon brush has been determined and used according to the contact resistance and the current capacity. However, when the motor is passed from country to country, it interrupts the driving force instantaneously due to the short circuit between poles, thereby suppressing the rotational force. Naturally, the efficiency decreases, and in the case of Slidax, a voltage is applied to both ends by winding a copper wire around a circular iron core, so that there is a difference in voltage between the lines. When the carbon brush stays, as shown in FIG. Since a and b are shorted, heat is generated in the brush.

As a result, the coil conducts heat and, in severe cases, burning water may occur, causing an unexpected safety accident. However, the present invention has been devised in view of the above-described defects, which will be described in detail based on the accompanying drawings.

In the carbon brush used as an electrical contact so that even if the brush goes over the gap or shorts the wires, carbon (J) made of needle-shaped rods is embedded as an insulator (V), but the carbon is on top After forming a brush that partitions the conductor bundle (J '), it is electrically bundled with one terminal (T), or the carbon conductor bundle is stacked on top of several sheets of carbon (J) stacked between the insulators (V). The part J 'is formed so as to form a bundle of one terminal T.

The effect of the present invention with such a structure is as follows.

First, the case of the Sliding dax of FIG. 4 will be described in detail. The coil C is wound around the circular iron core F and a voltage is applied, and then a movable terminal moves to continuously change a desired voltage. Therefore, the movable terminal carbon brush moves as the short circuit between the coil wires and the wires a and b as shown in FIG.

At this time, if the brush is too small to fall out between coils a and b, the power may be cut off. Therefore, the width of two coils should be L at all times. Will be placed and heat will be generated here.

As shown in FIGS. 5 and 6 of the accompanying drawings, when the carbon brush is a square rod having an area of L × L and a height of h in contact with the coil surface,

I. (1) Directional resistance of carbon brush Y currently in use (R ₁ )

(h ≒ It's about 4L when I look at the carbon terminal I usually use)

(2) Directional resistance (R ' ₁ ) of the plate-shaped carbon brush Y of FIG.

(Section area S 적 2 (L / 2 x L)

Where cross-sectional area S ≒ 2 ( × L) was induced

Insulation (since it is coated with a thickness of 0.1mm or less, it will be ignored)

Cross-sectional area S ≒ 2 ( × L) (The insulation is almost neglected, so it is almost the same.)

Cross-sectional area S = Insulation is divided into two at × L, so multiply by S = ( × L) × 2.

this Even if the cross-sectional area S ignores the thickness of the insulator, S = L ² .

* R ₁ = R ' _{1 in} formulas 1 and 2. … 3 meals.

II. (1) X direction resistance of FIG. 1 (current carbon brush)

(2) X direction resistance of FIG. 3 (brush (plate type) of this invention)

(When brush of Figure 6 is in contact with coil a, b by L / 4 each).

or

(When L / 2 is in contact with coils a and b).

Comparing the above 4 and 6 formula,

Taking this as an example of 1KW SRYDAX, the current flows in 8.3 Amp and the number of turns is about 200 times. .

If the resistance in the X-direction of FIG. 1 is 0.03 Ω and the resistance in the Y-direction is 0.12 Ω (at h4L), the line voltage drop is 0.6 volts (120 volts / 200 cycles). (Current brush)

1.The heat generated in the X direction (P = I ² R)

P ₁ = (0.6V / 003Ω) ² ㆍ 0.3 = 12Watt

The heat generated in the Y direction

P ₂ = 8.3 ² × (4 × 0.03) = 8.3 Watt

P ₃ = 20.3 W occurs in the entire generated heat P ₃ = P ¹ + P ₂ (if currently in use). (For this design)

2. Resistance in the X direction of Fig. 3 (in Formula 7)

R ' ₂ = 72 × 0.03 = 2.16Ω

Resistance in the Y direction (in formula 3)

If R ' ₁ = 0.12Ω (because L is 0.03Ω at h = 4L)

Since the voltage drop is 0.6 volts between the lines, heat generated in the X direction

P ' ₁ = (0.6 V / 2.16 Ω) ² x 2.16 = 0.15 Watts.

The heat generated in the Y direction is

Since what was designed in the first and second meals is almost the same

P ' ₂ = 8.3 ² × (4 × 0.03) ≒ 8.3 Watt

P ' ₃ = P' ₁ + P ' ₂

P ' ₃ = 0.17 + 8.3 = 8.47 Watt. (For this design)

Comparing P ₃ and P ' ₃ here is about 2.4 times, so if you use the design of the present invention, you will see a gain of 2.4 times less power consumption.

However, if the carbon brush has a smaller resistivity than the present design, the resistivity of L is about 0.001Ω, and if h is increased to 5L or more, the total calorific value (P ' ₃ ) can be lowered to less than 1Watt in 1KW Slidax.

As such, the effect of the present invention does not require attaching an aluminum plate to the brush terminal surface to dissipate the current, resulting in good economic efficiency and producing a large output slidach that could not be manufactured because it feels the heat limit until now. Not only will it be of great help to the industry, so there is no heat loss in the carbon brush, so there is no power loss and it is generated in the brush and conducted to the coil surface. This causes mechanical brushes to be destroyed and arcs to damage the coils, thereby completely eliminating the conventional defects that have shortened their lifespan. Because it is not necessary It is a new useful design that can raise the real value of real users by being able to manufacture large output Slidax which could not be made.

Claims (1)

In the carbon brush used as an electrical contact as shown, a carbon (J) made of a needle-shaped rod is embedded with an insulator (V), and a brush is formed at the top to partition the bundle (J ') of the carbon conductor. After that, it is electrically bundled with one terminal T or plate carbon (J) is sandwiched with several layers of insulating layer (V) interposed therebetween to form a bundle (J ') of carbon conductor on the top. Carbon brush, characterized in that it is bundled with one terminal (T).