JPS62283519A - 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] [Field of Industrial Application] This invention is applicable to switch electromagnetic devices, particularly main circuit normally closed contact type for motor control, shock-resistant and vibration-resistant type for crane and hoist control, and building Arrangement! This relates to buttons used to open and close the contacts of heat-resistant switches for panels.

[Conventional technology]

3 and 4 are diagrams showing a conventional electromagnet device disclosed in Japanese Utility Model Application Publication No. 59-59448. In the figure,
(1) is a full-wave rectifier that converts alternating current to direct current, (2) is an operating coil to which direct current is applied, and (3) is an operating coil (
2+Ki capacitor to limit the current flowing (4)
is a resistor, and (5) is a changeover switch for limiting the operating coil current. Since the changeover switch (5) closes with residual charge remaining in the capacitor (3), a large discharge current flows, but the resistor (4) is provided to suppress this discharge current.

(6) is a fixed iron core, which is excited by the operating coil (2)K. (7) is a movable iron core that is attracted to the fixed iron core (6).

In addition, the selector switch (5,) operates in conjunction with the movable core (7), and when the movable core (7) is in the released state, the selector switch (5) is closed and the movable core (7) starts the suction operation. After that, the movable iron core (7) opens before being attracted to the fixed iron core (6).

In the conventional switch electric sweetfish device configured as above,
When AC voltage is applied to this electromagnetic device, it is applied to the operating coil (2) via the changeover switch (5) and the full-wave rectifier (1).
). As a result, the fixed iron core (6) is excited, and the movable iron core (7) is attracted to the fixed iron core ((jl).

Before this movable core (7) is attracted to the fixed core (6), the changeover switch (5) opens, and the current limited by the capacitor (3) flows to the operating coil (2), and the movable core (7) is held by a fixed iron core (6).

By the above operation, the movable iron core (7) is attracted by a large magnetic force when the nitrogen gap is large, and after being attracted, it is held by a small magnetic force. Therefore, the power consumption of the coil during holding is small, and the full-wave rectifier (1) converts it into direct current, and since the direct current MLR flows through the operating coil (2), no 'am noise is generated.

Next, when the applied voltage is removed, the inductance energy of the operating coil (2) forms a flywheel circuit as shown in Figure 3i, and the current begins to attenuate due to the L-R circuit of the operating coil (2). When the attractive force of the electromagnet becomes lower than the repulsive force of a tripping spring (not shown), the movable core (7) is released, moves away from the fixed core (6), and is pushed up by the tripping spring.

[Problem that the invention seeks to solve]

In the conventional switch electromagnet device as described above, since the electromagnet has only one operation coil, the winding resistance of the operation coil is constant, and it is suitable for applications that require a large suction force only in the initial stage of suction. In order to obtain a large suction force when the movable iron core is attracted, it is necessary to increase the voltage, and as a result, there is a problem in that the operating coil dissipating 5LF force when holding the movable iron core also increases. This invention solves this problem. This is an electromagnet device for the switch that can obtain a large suction force only in the initial stage of suction and reduce the power consumption of the operating coil during holding! The 7 objectives are to obtain.

[Means for solving problems]

The electromagnet for a switch according to the present invention includes first and second operating coils connected in series, a photocoupler light emitting diode and bias resistor connected in parallel with these operating coils, and a collector connected to the first operating coil. The emitter is connected to the connection point of the first operating coil and the second operating coil, and the emitter of the base T phototransistor is connected to the open end side of r.
CN P An N-type transistor, one phototransistor whose collector is connected to the collector of the NPN-type transistor via a resistor, and a phototransistor whose collector is connected between the -1 terminal of the AC power supply and the -1 input side of the full-wave rectifier. A changeover switch, and a series-connected capacitor and resistor connected in parallel to the changeover switch! It is designed so that it can be prepared.

[Effect]

In this invention, when the power is turned on to attract the movable iron core, the changeover switch is turned on and the photocoupler is operated, so that the flow flows to the two operating coils! , the collector and emitter of the transistor that performs flow switching are brought into conduction, and only one operating coil is energized. At this time, a strong current flows, so a large suction force can be obtained in the initial stage of suction. When the movable core is held, the selector switch is turned off just before the movable core is attracted, and the photocoupler is not operated, thereby making the collector and emitter of the transistor non-conductive and energizing the two operating coils connected in series. 5, when the movable iron core is held, the two operating coils are energized and the current flowing through these coils is greatly reduced compared to the case where only one operating coil is energized because the resistance of the operating coils is increased.

〔Example〕

FIG. 1 is a circuit diagram showing an embodiment of the present invention, with reference numeral (1)
) to (5) are the same parts as the bar-coded parts in FIG. 3 showing the conventional example. (6) is a varistor connected in series with the delay type changeover switch (5) on the input side of the full-wave rectifier (1). (2a) is the first operating coil whose one end is connected to the positive side of the DC output of the full-wave rectifier (1), and (2b) is the second operating coil which is connected in series with the first operating coil (2a). The resistance of the second operating coil (2b) is smaller than that of the first operating coil (2a). (7)
is a bias resistor, (8) is a photocoupler for preventing surges, and its light emitting diode (9) is connected in series with the bias resistor (8). The resistor (7) and the light emitting diode (9) are connected in parallel with the first operating coil (2a) and the second operating coil (2b). 00
is a phototransistor of a photocoupler (8). The edge is an NPN type transistor, the collector is connected to the open end side of the first operating coil (2a), and the emitter is connected to the connection between the first operating coil /l' (22) and the second operating coil (2b). The base is connected to the emitter of phototransistor αG. 0 is a protection resistor, which is connected between the collector of phototransistor α0 and the collector of transistor 0.

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 and the graph in FIG. 2.

By turning on an external power switch (not shown), single-phase AC voltage from the AC power source is applied to the full-wave rectifier (1) through the changeover switch (5), which is turned on, and the full-wave rectifier ( The voltage rectified by 1) is applied to the first and second operating coils (2aL (2b). At this time,
The voltage rectified by the full-wave rectifier (1) trap is transferred to the photocoupler (
8), a current flows through the light emitting diode (9), and the optical signal hits the base of the phototransistor (10) and causes the phototransistor (10) to pass through.
A voltage is applied to the base of transistor αυ, and conduction occurs between the collector and emitter of transistor αυ, and only the second operating coil (2b) Full wave rectifier (1)
A voltage rectified by is applied. At this time, the second
Since the resistance of the operating coil (2b) is small, a large current flows, and as shown in FIG. 2, a large attractive force is generated compared to the conventional example. Then, the movable core (not shown) begins to be attracted to the fixed core. Immediately before the movable core is attracted to the fixed core, the delay type changeover switch (5) is opened and turned off. Then, the supply voltage of the single-phase AC power source is divided by the series-connected capacitor (3) and resistor (4) connected in parallel to the changeover switch (5), and the output voltage of the full-wave rectifier (1) drops. Light emitting diode (9
) is reduced, the optical signal is no longer output, and the collector and emitter of the phototransistor (8) become non-conductive. Therefore, the collector and emitter of the transistor (1η) also become non-conductive, and the voltage rectified by the full-wave rectifier (1) is now applied to the series circuit of the first operating coil (2a) and the second operating coil (2b). is applied, and a current flows through these coils (2a) and (2b) to maintain the holding state of the movable core with respect to the fixed iron core.The current in this holding state is maintained by the first operating coil (2a) and (2b).
2a) and the second operation coil (2b), the coil resistance becomes larger than when the power is turned on, and the current becomes smaller than the turning-on current. Therefore, in the holding state, a power-saving electromagnet can be obtained as in the conventional example.

Next, when the power switch is shut off, the applied voltage from the outside disappears, and the full-wave rectifier (1) and the full-wave rectifier (1) are These coils A/(2a), (2b) are consumed in the flywheel circuit formed between the first operating coil (2a) and the second operating coil (2b).
The current begins to rapidly attenuate, the attractive force of the fixed core becomes weaker, and the movable core is released when this attractive force becomes weaker than the elastic force of a tripping spring (not shown).

〔Effect of the invention〕

As explained above, this invention is a trap.When the movable iron core is attracted and the power is turned on, the selector switch is turned on and the photocoupler is operated, thereby creating continuity between the collector and emitter of the transistor that switches between the two operating coil currents. When the movable core is held, the selector switch is turned off just before the movable core is attracted to prevent the photocoupler from operating, thereby creating non-conduction between the collector and emitter of the transistor. Since the two operating coils connected in series are energized in the same way, when the movable iron core is attracted, only one operating coil is energized, and the resistance of the operating coil is lower than in the conventional example, and a large current flows, so that the attraction is reduced. A large attraction force can be obtained at the initial stage, and the reaction force of the tripping spring can therefore be made thicker, which eliminates the shortcoming of the small initial attraction force of AC-operated DC magnets. It is ideal for shock/vibration resistant and heat resistant switches, and has the effect that the attraction force can be freely selected by the coil design of the operating coil.Also, when holding the movable core, two operating coils are used. The current flowing through these coils when excited is significantly reduced compared to the case where one operating coil is excited, and the effect is that a power-saving electromagnet can be obtained as in the conventional example.

[Brief Description of the Drawings] Fig. 1 is a circuit diagram showing one embodiment of the present invention, Fig. 2 is a graph showing the attractive force characteristics of the electromagnet and the repulsive force characteristics of the switch of the above embodiment and the conventional example, and Fig. FIG. 3 is a circuit diagram showing a conventional electromagnet device for a switch, and FIG. 4 is a schematic diagram of the same electromagnet device. In the figure, (1) is a full-wave rectifier, (2a) is a first operating coil, (2b) is a second operating coil, (3) is a capacitor, (4) is a resistor, (5) is a changeover switch, (7)
(8) is a photocoupler, (9) is a light emitting diode, OQ is a phototransistor, 0η is an NPN
(2) is a protection resistor. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Patent Attorney Masaru Sato Year 1: Waki g skin mark t Q 硲 7: Bias A, T
hole a2 i7 no 1 east 4) ¥ carp 1 shi 8: notch ＼to sword bubu 2b, second j ⑶ coil 9: source ri゛io F3: condensed (0: phototransmission nuku 41 kJ 9 IVNPN
Type transhinuku 5: f17J switch”
12: Amendment to the procedure for the nail king nine for the Iurine bell (voluntary) November 5th, 1985

Claims (1)

[Claims] The first operating coil and the second operating coil are connected in series.
In an electromagnet device for a switch, which is divided into two operating coils, and the supply voltage from a single-phase AC power source is applied to these operating coils after being full-wave rectified by a full-wave rectifier, the first operating coil and the second operating coil are divided into two operating coils. A series-connected photocoupler light emitting diode and bias resistor connected in parallel with the operating coil; a collector connected to the open end side of the first operating coil, and an emitter connected to the first operating coil and the second operating coil; At the point, an NPN transistor whose base is connected to the emitter of the phototransistor of the photocoupler; a phototransistor of the photocoupler whose collector is connected to the collector of the NPN transistor through a protective resistor; and one side of the single-phase AC power supply. a changeover switch connected between the terminal of the switch and one input side of the full-wave rectifier, which is closed when the power is turned on and released just before the core is attracted; and a series-connected capacitor connected in parallel to the changeover switch. and a resistor.