JPS62283520A - Electromagnet for switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] This invention relates to electromagnets for switches, particularly main circuit normally closed contact type for motor control, cranes, and hoist control. Attack/
Used to open and close the contacts of vibration-resistant type, heat-resistant type switches for building switchboards, etc. KISI! It is something to do.

[Conventional technology]

FIGS. 4 and 5 are diagrams showing conventional electromagnet devices for switches. In the figure, (1) is a power switch for a direct current X source DC, and (2a) and (2b) are first and second operation filters connected in series, in which 1 is connected in series to the source switch (1). (3a) and (3b) are fixed iron cores, which are excited by tal and the second operating fills (2a) and (2b). (4) is the base of the fixed core (3a) (3b), (5) is the movable core and the fixed core (3a), (3b)
) ItCW is subtracted.

In the conventional switch electromagnet device configured as described above, when the 11Lii+1 switch (1) is turned on, the DC voltage from the DC power supply DC is applied to the electromagnet device and the operating coils (2a) and (2b) Current flows. As a result, the fixed cores (3a) and (3b) are excited, and the movable core (5) is attracted to the fixed cores (3a) and (3b). When the power switch (1) is in the on state, the movable core (5) is connected to the fixed cores (3a) and (3b).
) is held. Operation carp, /I/ (2m) * (2
b) Since direct current flows through K, no electromagnetic noise is generated.

Next, 11E! When the switch (1) is turned off and the applied voltage is removed, the movable core (5) is released by the reaction force of a tripping spring (not shown), and the fixed core (3 m) is released.

(3b) and is being pushed up by the above-mentioned tripping spring.

[Problem that the invention seeks to solve]

In the conventional switch electromagnet device as described above, two operating coils of the electromagnet are connected in series, and DC voltage is applied to these two operating coils when the movable core is attracted. There is a problem that sometimes a large suction force cannot be obtained, and it is difficult to use it for applications that require a large suction force at the initial stage of suction.

The present invention has been made to solve these problems, and an object of the present invention is to provide an electromagnet device for a switch that can obtain a large suction force at the initial stage of suction, and can also easily connect a power source.

[Means for solving problems]

The electromagnet device according to the present invention has a direct current of 1! power supply, a power switch that turns on and off the DC power supply, a changeover switch that is connected in series to the DC power supply, closes when the power is turned on, and opens just before the movable core is attracted, a bias resistor, and a photocoupler. a light emitting diode, the collector is connected to the open end side of the first operating coil, the emitter is connected to the connection point of the first operating coil and the second operating coil, and the pace is connected to the emitter of the phototransistor of the photocoupler. I did N
An electromagnetic device for a switch, comprising a PN transistor and a phototransistor of a photocoupler whose collector is connected to the collector of the NPN transistor via a protective resistor.

[For production]

In this invention, when the power is turned on to attract the movable core, the selector switch is turned on and the photocoupler is operated, thereby establishing electrical continuity between the transistor flefter and the emitter iJ1, which switch the current flowing through the two operating coils. Energize only one operating coil. At this time, since a large current flows, a large suction force can be obtained at the initial stage of suction. When the movable core is held, just before the movable core is attracted, the selector switch is turned off to prevent the photocoupler from operating, thereby making the collector and emitter of the transistor non-conductive and energizing the two series-connected operation filters.

[Embodiment] FIG. 1 is a circuit diagram showing an embodiment of the present invention, and the reference numeral (1)
) to (5) are the same parts as those with the same reference numerals in FIGS. 4 and 5 showing the conventional example. (2a) is the first operating coil connected to the power switch (11) whose one end is connected to the positive side of the DC power supply DC; (2b) is the first operating coil (
2a), and the resistance of the second operating filter (2b) is connected in series with the first operating filter (2a).
a) It is smaller. (6) is the power switch (1
) is closed when the power is turned on, and is opened immediately before the movable iron core (not shown) is attracted, and is connected to the open end side of the first operation fill (2a). (7) is a bias resistor, (8) is a photocoupler to prevent surges, and its light emitting diode (9) is a selector switch (6).
, a bias resistor (connected in series with the force), this selector switch (6), the resistor (force) and the light emitting diode (9) are connected to the first operating coil (2a) and the second operating filter (2b).
) is connected in parallel with vCg. αa is photocoupler (8)
This is a phototransistor.

αυ is an NPN type transistor, the collector is connected to the open end side of the first operating coil /I/(2a), and the emitter is connected to the first operating coil (2a) and the second operating coil (2a).
b), and the base is connected to the phototransistor O
It is in contact with the emitter of No. 1 and is narrowed down. α2 is a protective resistor, which connects the collector of phototransistor 00 and the transistor Ql.
) and the collector.

The operation of the electromagnetic device of the switch configured as described above is explained in the first section.
The explanation will be based on the circuit diagram shown in the figure.

By turning on the power switch (1), the light-emitting diode (
9), a current flows through the light emitting diode (9),
The optical signal hits the base of the phototransistor 00, and the collector and emitter of the phototransistor α become conductive. Therefore, a voltage is applied to the base of the transistor αυ, the collector and emitter of the transistor αυ become conductive, and the voltage of the DC power supply is applied only to the second operating coil (2b). At this time, the second operation fill (2b
) is small, so a large current flows, and as shown in FIG. 2, a larger attractive force is generated compared to the conventional example. Then, the fixed core begins to be attracted to the movable core (not shown).

Immediately before the movable core is attracted to the fixed core, the changeover switch (5) is opened and turned off.

Then, since the voltage of the DC power source is no longer applied to the light emitting diode (9), it no longer outputs an optical signal and the collector and emitter of the phototransistor αQ become non-conductive. Therefore, the collector and emitter of the transistor αυ also become non-conducting, and the first operating coil (
A DC type #DC voltage is applied to the series circuit of 2&) and the second operation filter (2b), and these coils (2m),
A current flows through (2b) to maintain the holding state of the electromagnet. Since the holding current in this holding state flows through the first operating coil (2a) and the second operating filter (2b), the coil resistance becomes larger than when it is turned on, and the current becomes smaller than the turning-on current. Therefore, in the holding state, an electromagnet similar to that of the conventional example is obtained.

Next, when the power switch [1] is turned off, the movable core is released by the reaction force of a tripping spring (not shown).

FIG. 6 is a circuit diagram of another embodiment of the invention.

In this embodiment, components that are the same as those in the previously described embodiment are given the same reference numerals as in the previously described embodiment, and explanations of components A and 4 that have been restored will be omitted.

In this embodiment, the input side of the aftereffect rectifier side is connected to the DC power supply DC, and the series-connected changeover switch (6), bias resistor (7), and light emitting diode (9) are connected to the output side of the full-wave rectifier 14). has been done. Of course, first and second operating filters (2a), (
The open end side of 2b) is connected.

In this way, the DC 11t#DC and these operating coils (
The reason why the full-wave rectifier α41 is provided between 2a) and (2b) is that even if the polarity of the DC power source DC is connected incorrectly, the open end side of the first operation filter (2a) and the light emitting diode (9) are always connected. This is because the positive electrode of DC 11tiIlit is applied to the positive side of ). Therefore, no problem will occur even if the direct current power supply DC is connected with the positive and noble terminals mistakenly connected.

〔Effect of the invention〕

As explained above, in this invention, when the power is turned on to attract the movable core, the selector switch is turned on and the photocoupler is operated, thereby creating a conductive state between the collector and emitter of the transistor that switches the current flowing through the two operating coils. By energizing only one operating coil, and by turning off the selector switch just before the movable core is attracted and preventing the photocoupler from operating, the pressure during holding of the movable core can be maintained between the collector and emitter of the transistor. Since the two operating filters connected in series are made conductive and energized, only the operating filter (-) is energized when the movable iron core is attracted, reducing the resistance of the operating filter compared to the conventional example.
Since a large current flows, a large attraction force can be obtained at the initial stage of Kg & pulling, and therefore the reaction force of the tripping spring can be increased, which eliminates the shortcoming of a DC electromagnet's small initial attraction force, and makes the main open normally closed contact It is ideal for molded, shock-resistant, vibration-resistant, and heat-resistant switches, and has the effect that the attraction force can be freely selected depending on the coil design of the operating coil.

Another invention is that a rectifier is provided between the DC power supply and the two operation filters, so even if the polarity of the DC power supply is incorrectly connected, the open end of the first operation coil and the positive side of the light emitting diode are always connected. Since the positive electrode of the DC power source is applied to the terminal, there is an effect that the process of connecting the power source can be easily performed.

[Brief explanation of drawings]

tg1 is a circuit diagram showing an embodiment of the present invention, Fig. 2 is a graph showing the attractive force characteristics of the W/1 magnet and the repulsive force characteristics of the switch of the above embodiment and the conventional example, and Fig. 3 is a graph showing the attraction force characteristics of the W/1 magnet and the repulsive force characteristics of the switch. FIG. 4 is a circuit diagram showing another embodiment of the present invention, FIG. 4 is a circuit diagram showing a conventional electromagnet device for a switch, and FIG. 5 is a schematic diagram of the same electromagnet device. In the figure, (1) is the power switch, (2&) is the first operating coil, (2b) is the second operating coil, (6) is the changeover switch, (force is the bias resistor, (8) is the photocoupler, (9) is an M photodiode, α1 is a phototransistor, αυ is an NPN transistor, Q2 is a protective resistor, and I
is a full-wave rectifier, and DC is a direct current power supply. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (2)

[Claims] (1) In an electromagnet device for a switch that applies a supply voltage from a DC power source to first and second operation coils connected in series to attract a movable iron core to a fixed iron core, the DC power source and the DC power source are turned on. - A power switch that turns off; a changeover switch that is connected in series with the DC power supply, closes when the power is turned on, and is released just before the movable iron core is attracted; a bias resistor and a photocoupler light emitting diode; and a collector. an NPN type transistor, which is connected to the open end side of the first operating coil, and has an emitter connected to the connection point between the first operating coil and the second operating coil, and a base connected to the emitter of the phototransistor of the photocoupler; a collector; and a phototransistor of a photocoupler connected to the collector of an NPN transistor via a protective resistor. (2) In a switch electromagnet device that applies a supply voltage from a DC power source to the first and second operating coils connected in series to attract a movable iron core to a fixed iron core, the DC power source and the DC power source are turned on. - A power switch that turns off; a full-wave rectifier whose input side is connected to a DC power supply; and a full-wave rectifier connected in series to the output side of the full-wave rectifier, which is closed when the power is turned on and released just before the movable iron core is attracted. a changeover switch, a bias resistor, and a photocoupler light emitting diode; the collector is placed on the open end side of the first operating coil, the emitter is placed on the connection point between the first operating coil and the second operating coil, and the base is placed on the connection point between the first operating coil and the second operating coil. An electromagnet for a switch, comprising: NPN transistors each connected to the emitters of the phototransistors of the photocoupler; and a photocoupler phototransistor whose collector is connected to the collector of the NPN transistor via a protective resistor. Device.