KR860000838Y1 - Coil for dc power - Google Patents

Abstract

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Description

Electromagnet device for AC power

1 is a view showing a conventional single-phase AC electromagnet apparatus.

2 is a circuit diagram of FIG.

3 is a voltage vector diagram of the apparatus shown in FIG. 1 and FIG.

FIG. 4 is a diagram showing the change in the operating coil terminal voltage and the suction force of the apparatus shown in FIGS.

5 and 6 are circuit diagrams of a conventional device, respectively.

7 and 8 are diagrams showing temporal changes at operation coil terminal voltage and suction force input of the apparatus shown in FIGS. 5 and 6;

9 is a circuit diagram showing an embodiment of the present invention.

10 is a voltage vector diagram shown in FIG.

* Explanation of symbols for main parts of the drawings

1: movable iron core 2: fixed iron core

3: Shading coil 4: Operation coil

5: shading part 6: non-shading part

7: single phase ac power 8: switch

9: full wave rectifier 10: direct current control coil

11: DC operation operation coil 12: Normally closed contact

13: saving resistance 14: non-polar capacitor

15: operating coil C: capacitance

I ₁ : Input current V: Single phase AC power supply voltage

R: Internal resistance of operating coil I ₂ : Holding current

L: inductance

The present invention relates to an improvement of an electromagnet apparatus using a single-phase AC power supply as an operation power source.

As a conventional electromagnet apparatus using a single-phase alternating current power supply as an operation power source, the most common direct single-phase alternating voltage is applied to the operation coil in FIG.

In FIG. 1, (1) is a movable core, (2) is a fixed core, (3) a shading coil mounted to the fixed core (2) to eliminate the zero point of the electron attraction force, (4 ) Is the operating coil for issuing the magnetic flux, (5) is the shading part surrounded by the shading coil (3), ø ₁ is the non-said part magnetic flux passing through the center of the non-shading part (6), ø ₂ is the shading part (5) The shading sub flux passing through the center, G, is the gap between the movable core (1) and the fixed core (2). The connection of this apparatus is shown in FIG. 2 and the voltage vector diagram is shown in FIG.

2 and 3, reference numeral 7 denotes a single phase AC power supply, 3 denotes a switch, V denotes a voltage of the single phase AC power supply 7, R ₁ denotes an internal resistance of the operating coil 4, and W denotes a single phase AC power supply. Each frequency L in (1) is an inductance of the operation coil 4, and I is an electric current which flows through the operation coil 4. As shown in FIG.

In the conventional electromagnet apparatus shown in FIG. 1 and FIG. 2, when the switch 8 is closed, the operation coil 4 is excited and the movable iron core 1 is attracted to the fixed iron core 4. In general, the AC electromagnet has a small inductance L of FIG. 3 when the air gap G is large, and a large rush current flows in the operation coil 4 and can generate a greater suction force than the DC electromagnet. When the movable iron core 1 and the fixed iron core 2 are closed by suction, the inductance L becomes large and the current I flowing in the operating coil 4 decreases.

At this time, it is not a shading coil (3) Assay Pending part magnetic flux ø ₂ and the non-shaded spirit rich in is the phase difference (位相差) generated between ø ₁ attraction force of the electromagnet (零) by the electromagnet has a attraction state Keep it.

It is not too much to say that the good and the bad of the conventional electromagnet apparatus is related to how the minimum value of the suction force can be designed large.

Fig. 4 (a) shows the terminal voltage waveform diagram applied to the operation coil 4 from the start of suction, and Fig. 4 (b) shows the curve of the suction force change.

Even if this electromagnet device was designed to be most suitable, vibration of suction force could not be avoided, and noise of iron core was a big problem. In the initial stage, the suction time can be shortened by the relatively large suction force, but it has become a big problem because the input shock is increased and the life or other parts and mechanism parts are adversely affected.

In addition, since the magnetic flux passing through the iron core alternately, there is a loss due to the hysteresis loss in the iron core and the current flowing through the shading coil 3. Shading loss is inevitable, and the power consumption of the adsorption state is never small. In addition, in view of the material structure, in order to reduce the hysteresis loss, an expensive silicon steel sheet is inevitably composed of a laminated iron core, and thus a great technique was required for the manufacture of the shading coil device.

In order to cope with this problem, a direct current control device using the DC resistance device of FIG. 5 and the saving resistor of FIG. 6 has been proposed.

Next, the apparatus of FIG. 5 and FIG. 6 is demonstrated. That is, in Figs. 5 and 6, reference numeral 9 denotes a full-wave rectifier, 10 denotes a full-voltage or direct-acting operation coil, and 11 denotes a full-voltage at the time of inputting. Lost direct current operating coil, (12) is a normal closing contact for switching between input and after adsorption, (13) is a saving resistance to save power consumption by lowering the voltage applied to the operating coil (11) after adsorption.

In the apparatus of FIG. 5, since there is no alternating magnetic flux, there is no hysteresis loss in the iron core, and no shading coil is required.

However, a large magnetoscopic force is required at the time of input, and if a large current flows so that sufficient suction force can be obtained at the time of input, a large current continues to flow even after adsorption. This burns out.

For this reason, the coiling current is limited by limiting the energizing current of the coil, so that a large number of turns are required, and the operation coil 10 becomes a bulky coil. In addition, as the coil itself becomes large, power consumption after adsorption generally becomes considerably larger than that of the AC electromagnet apparatus of FIG.

In FIG. 6, in the apparatus of FIG. 5, the input and the adsorption are switched to the upper and lower contact points 12 to prevent the coil from growing or to reduce the power consumption after the adsorption. However, even in this case, the resistance loss occurs considerably with the saving resistor 13, so that power consumption is never reduced even after adsorption. And since the resistance loss of the saving resistor 13 is large, the saving resistor 13 has a drawback as a large resistor with a large allowable input.

7 and 8 show the voltage waveforms applied to both ends of the operating coils 10 and 11 of the electromagnet apparatus of FIG. 5 and FIG.

The present invention is designed to solve the above-mentioned shortcomings, and when the input is applied, the capacitor is connected in series before the stop by applying a voltage rectified to the coil directly and opening the upper and lower contacts immediately after or immediately after the adsorption. The purpose of this invention is to provide an inexpensive AC power electromagnet with no iron core noise, low input power consumption, and low input impact.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 9 is a view showing an embodiment of the present invention, Figure 10 is a vector diagram. That is, in Fig. 9, reference numeral 14 denotes a nonpolar capacitor, and its capacitance is C. Numeral 15 denotes an operation coil, in which the upper and lower contact points 12 are conducted at the time of inputting, and the upper and lower contact points 12 are opened after the adsorption or just before the adsorption. The voltage divided by 14 is applied.

In Fig. 10, V denotes a single-phase AC power supply voltage, R ₁ denotes an internal resistance of the operating coil 15, I ₁ denotes an input current flowing when the nonpolar capacitor 14 is short-circuited by the phase-closing contact 12 when inputting. I ₂ is a holding current through which the upper and lower contact points 12 are opened and flow through the circuit of the nonpolar capacitor 14 and the operation coil 15.

The capacitance C of the above capacitor and the inductance L of the operation coil are designed so that resonance does not easily occur. According to the device of this embodiment, as in FIG. 10, a large input current I _1, which is determined only by the internal resistance R ₁ of the operating coil 15, flows when the input is made, thereby securing the magnetomotive force required during the input. At the time of holding, a small holding current I ₂ , which is determined by the nonpolar capacitor 14 and the internal resistance R ₁ , flows to hold the iron core.

At this time, the magnetic flux flowing to the iron core is not altered to the last, and since the stop 9 forms a flywheel circuit, all noise of the iron core is eliminated. For this reason, the core does not need to laminate expensive silicon platelets, and it is possible to use inexpensive iron sheets, cast steel, molded steel, etc., and no shading coils are required, and no hysteresis loss or shading coils are used. In addition, since the voltage drop is caused by the nonpolar capacitor 14, the power consumed by the operation coil 15 becomes very small.

In addition, since the power consumption is zero in the capacitor, the total power consumption becomes very small. As a result of experiments on the electromagnet of the magnetic contactor, the power consumption is compared with the conventional electromagnet devices such as FIG. 5 and FIG. silver It turned out to be the following. In addition, the input shock It turned out to be the following. In addition, the arc normally generated when the upper and lower contact points 12 are opened is absorbed by the nonpolar capacitor 14, and the upper and lower contact points 12 become non-electric arcs. No noise is generated.

The present invention can be used as an electromagnet driving device in many fields such as a magnetic contactor, an electromagnetic relay, a timer. In addition, the above description has been given of the case where the closing contact is closed after the fixed core and the movable core are adsorbed or immediately before the adsorption bar. This can certainly be prevented and has the advantage of preventing the charting of the contacts. As described above, the present invention electronically rectifies the single-phase AC power supply, so that the shock at the time of input is alleviated and there is no iron core noise.

In addition, since a nonpolar capacitor is used for the voltage drop during the maintenance, the power consumption is reduced and no arc is generated at the switching normally closed contact. In addition, it is possible to use a cheaper iron core material, no need for a shading coil, there is no hysteresis loss, no shading coil loss, there is an effect of obtaining a cheap high-performance single-phase exchange electromagnet device.

Claims (2)

The operation coil 15 of the electromagnet device operated by the direct current power of the single phase full wave rectifier 9 and the nonpolar capacitor 14 and the electromagnet connected between the single phase full wave rectifier 9 and the single phase ac power source 7. An electromagnet apparatus for alternating current power, comprising a parallel connection body with a normal closing contact (12) operated by an operating coil of the apparatus. 2. The electromagnet apparatus for alternating current power source according to claim 1, wherein the upper and lower contact points (12) open after the movable iron core (1) and the fixed iron core (2) of the electromagnet apparatus are adsorbed.