JPS63300503A - Excitation device for electromagnet apparatus - Google Patents

Abstract

PURPOSE:To save power consumption by simultaneously exciting a start coil and a holding coil, moving a movable body, generating an induced electromotive force on the holding coil and deexciting the start coil through detection of such induced electromotive force. CONSTITUTION:When a switch 24 is turned conductive, the main control circuit 25 applies a voltage to the lines 29, 30 through the lines 26, 27. Thereby, the start coil 2 is excited and an output voltage of power supply 23 is lowered by DELTAv1 from the voltage at the time of deexcitation due to the internal resistance of power supply 23. The main control circuit 25 applies a voltage to the holding coil 3 and the pulses p1, p2 are superposed to the lines 31, 32. A level discrimination circuit 33 discriminates the level of pulse p2 with the discrimination level Vl and applies an inactivation signal having the predetermined pulse width to the main control circuit 25 and auxiliary control circuit 28 from the line 34. Thereby, the auxiliary control circuit 28 cuts off the excitation power of the lines 29, 30. Only the holding coil 3 is excited and the start coil 2 is kept deexcited and therefore power consumption of electromagnet apparatus 1 can be saved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an excitation device for a coil used in an electromagnetic device such as a solenoid valve.

BACKGROUND ART Book 1 The applicant displaces a plunger connected to a valve body of a solenoid valve by using a large electromagnetic force generated by a starting coil against a spring force in the valve closing direction, and temporarily returns the valve to an open state. We have proposed a device that demagnetizes the starting coil and leaves the holding coil energized after this happens, thereby reducing power consumption. Is the starting coil low invigorated to generate a large electromagnet and therefore? Stomach ″r
1 power is large, the holding coil has high impedance, and power consumption is small.

Conventionally, in such devices, the pulse width of the voltage applied to the starting coil is kept constant (,), and the pulse width is changed to become longer as the voltage decreases, depending on (1,) or fluctuations in the voltage. There is.

Problems to be Solved by the Invention In such devices, the pulse width of the voltage applied to the starting coil is selected to be sufficiently long in order to reliably engage the solenoid valve. Therefore, even after the valve is opened by the electromagnetic force of the starting coil, the starting coil continues to be excited. Therefore? The cost of electricity was large, and when batteries were used as a power source, the lifespan of the batteries was shortened.

The purpose of the invention is to provide an excitation device for an electromagnetic device that enables the electromagnetic RI device to be excited with as little electric power as possible.

Means for Solving the Problems The present invention provides an electromagnet that moves a moving body made of a ferromagnetic material by electromagnetic force caused by excitation of a starting coil, and holds the moved body by electromagnetic force caused by excitation of a holding coil. x In the excitation system m, there is a means for exciting the starting coil, a means for exciting the holding coil at the same time as excitation of the starting coil, and a means for keeping the holding coil energized thereafter, and a means for exciting the holding coil due to the movement of the moving body. yJ induced electromotive force detection means; and means for demagnetizing the starting coil by disabling the starting coil excitation means when the induced electromotive force is detected in response to the output from the @3 detection means. This is an excitation device for an electromagnet device characterized by the following.

A cousin of the present invention is to excite the starting coil and the holding coil at the same time, thereby moving a movable body such as a planter made of ferromagnetic material, and creating an induced electromotive force in the holding coil due to this movement. The electromotive force induced in the holding coil caused by the movement of the holding coil is detected by the detection means, and the starting coil is thereby demagnetized.

Therefore, the starting coil is demagnetized immediately after the moving object moves. Therefore, no power is wasted by the activation coil. Even after the starting coil is demagnetized, the holding coil remains energized and the moving state of the moving body is maintained.

Embodiment FIG. 1 is an electrical circuit diagram of an embodiment of the present invention. The electromagnetic device I has a starting coil 2 and a holding coil 3, the holding coil 3 having a number of 8 greater than the starting coil 2.

The starting coil 2 has a low impedance, e.g.
．． 8Ω, and the holding coil 3 has a high impedance, for example, 600Ω.

The electromagnetic device 1 is implemented in conjunction with a solenoid valve 4 shown in FIG. This solenoid valve 4 is used to supply and cut off fuel gas such as city gas to the burner of the instantaneous water heater. A valve chamber 8 is formed in the valve body 5 between the inlet 6 and the lower outlet.

A body 10 is seated on the valve seat 9 protruding into the valve chamber 8 by a spring 11, and the body 10 is seated in the valve closing direction (7 in Fig. 2).
9). The valve head 10 is fixed to the lower end of a planter 12 made of ferromagnetic material.

End plates 1 and t are fixed to the valve body 5 with bolts 15 through packings 13, and a guide cylinder 16 through which the plunger 2 is inserted is fixed to the end plates 1 and t. Guide tube 1
G is made of a non-magnetic material, and a starting coil 2 and a holding coil 3 are wound around this guide tube 1G. A fixed iron core 17 is provided corresponding to the upper end of the planter 12 on the side opposite to the valve body 10, and a ○ ring 13 is provided between it and the guide tube 16.
will be distributed. The fixed iron core 17 is fixed to one hashing fixed to the end plate 14.

Referring again to FIG. 1, a power source 23 such as a dry battery and a manual operation switch 24 are connected to a main control circuit 25. Excitation power for exciting the starting coil 2 is supplied to two lines 30 from the main control circuit 25 via lines 26 and 27 and the auxiliary control circuit 28 . Main control circuit 2
The excitation force for the holding coil 3 is also supplied via the line 31g32. The level discrimination circuit 33 level-discriminates and detects the induced electromotive force of the holding coil 3 generated in the lines 31 and 32, and when the induced electromotive force is detected as described later, the main control circuit 25 and the auxiliary control circuit 28 4y′ via line 3,1
;J, thereby causing the auxiliary control circuit 28 to cut off the excitation power applied to the starting coil 2 via the line 29.30. The main control circuit 25 responds to the operation of the switch 24 by supplying power to the lines 26 and 27 that lasts for a predetermined time T, for example 300ωSee, and keeps the holding coil 3 energized via the lines 31 and 32. do.

In the electromagnet device 1, the electromagnetic force generated by the starting coil 2 and the holding coil 3 is generated by the plant magnet 12.
is attracted and displaced upward in FIG. 2 against the spring force of the spring 11 in the valve closing direction.

3 shows the waveform of the voltage applied to the electromagnet device 2, and the line Je1 in FIG. 4 shows the characteristics of the electromagnet device 1.

According to the conventional thinking, as the voltage 1 applied to the starting coil 2 from line 29.30 decreases, the pulse @AW is selected rapidly, thereby ensuring that the 1m valve condition is reached. be able to. The voltage on power supply 23 decreases with use, and from line 29.30 starting coil 2
It is assumed that when the voltage (1) applied to the valve is reduced to, for example, 2 (2), the valve open state can be achieved by setting the pulses (1) to (2) to 200 m5ec. In this case, if the pulse width W is 200 Iasec and is always constant regardless of the change in the voltage 1 between the lines 29 and 30, then the reference numbers a-b-c-d-e-
Power corresponding to the area surrounded by t will be wasted.

When attempting to excite the starting coil 2 by changing the pulse width W in accordance with changes in the voltage applied to the starting coil 2, the r line 12 indicates the characteristics of the electromagnet device 1. No. 1, τ) also needs to have a margin of risk.

Therefore, even if the 891JJ coil 2 is excited along the line r2, the reference number a-1z-r-c-c-a in the figure
Power consumption will be wasted within the range surrounded by .

In the present invention, an auxiliary control circuit 28 and a level discrimination circuit 33 are provided in order to solve this problem of power consumption. Referring to Figure 5, switch 2 and t as shown in Figure 5 (1).
When conduction occurs at time L1 as indicated by the hand, main control circuit 2
5 cleans line 26.27 and f5 to line 29.30
5 Apply the voltage shown in Figure (3). As a result, the starting coil 2 is energized, and the output voltage of the power source 23 is therefore lowered by Δv1 than the voltage at the time of demagnetization, as shown by 2) in FIG. 5, due to the internal resistance of the power source 23. The excitation current flowing through line 29.30 to starting coil 2 is:
As shown in FIG. 5 (4). After time t1, the excitation current of the third starting coil 2 increases, and when the planter 12 is displaced upward in FIG. 2 against the spring force of the spring 11 between times t2 and t3, this causes the starting coil 2 to The excitation current decreases by 11H5. 0 time t3
Then, the plunger 12 is magnetically attracted to the fixed iron core 17, and after this n15Ht3, the excitation current of the starting coil 2 increases again and -CO<.

The main control circuit 25 applies pressure to the holding coil 3 as shown in FIG. be done. Pulse p 1 generated at time t1
is the rising waveform of the current due to initial excitation of the holding coil 3.

Pulse II 2 , which is important in the present invention, is generated by the plantar 12 being magnetically attracted to the fixed iron core 17 . The level discrimination circuit 33 discriminates the level of the pulse p2 using the discrimination level V, and at time IIJ t 1, a disabling signal having a pulse width determined by rT- as shown in FIG. It is applied to the control circuit 25 and the auxiliary control circuit 28. This causes the auxiliary control circuit 28 to cut off the vfh magnetic power on line 29.30. Time t4
From then on, only the holding coil 3 is energized and the starting coil 2 remains demagnetized, so the power consumption in the electromagnet device 1 is small, and the voltage drop Δ~r2 of the electric current 23 (Fig. 5 (2) (see FIG. 5(5)) is relatively small, and the voltage applied to the line 31H32 increases by l) (, lrQ ΔV S (see FIG. 5 (5)) from the steady state immediately before time t3.

When the output voltage of the power supply 23 decreases by 1°C,
The time from 1 to L3 becomes longer. As the power supply 23 is further consumed, its output voltage decreases, and the planter 12 is attracted upward in FIG. 2 and moves! Il! The operation when lJ is not performed will be explained. As shown in Figure 6 (1), n
,? When the switch 24 is turned on at II t G, =
The control circuit 25 is connected to the lines 2G, 27, and the auxiliary control circuit 23.
A voltage shown in FIG. 6(3) is applied to the starting coil 2 through the lines 2 and 30, thereby
The output voltage decreases as shown in FIG. 6(2). As shown in FIG. 6(4), the excitation current of the starting coil 2 increases as time AI passes and reaches a constant value.

The main control circuit 25 also applies a voltage to the holding coil 3 after time 6, and the voltage waveform of the lines 31 and 32 becomes as shown in FIG. 6(5). By energizing the holding coil 3 at time t6, a pulse Llu is superimposed on line 31, 32 at time 6.

Thereafter, despite the excitation of the starting coil 2 and the holding coil 3, the planter 12 does not move upwards in FIG. No pulse p2 is generated on line 31,32. Therefore, level Ibetsu circuit 33 and line 3
The signal derived from auxiliary control circuit 28 remains at a low level as shown in FIG.
continues to connect line 26 to line 29 and line 27 to line 30. The main control circuit 25 includes B, 7
At time t7, when a predetermined time, for example, 300 m5ec has elapsed from time t6, the power to lines 2G, 27; 31, 32 is cut off. In this way, the activation coil 2 prevents a large amount of power from being unnecessarily consumed for a long time, and the holding coil 3 is also prevented from wasting power.

The present invention is not only implemented in connection with the solenoid valve 4 (
For example, it can be widely implemented in conjunction with relays and other electromagnetic devices.

Effects As described above, according to the present invention, the movable body moves by simultaneous excitation of the starting coil and the holding coil, and therefore an induced electromotive force is generated in the holding coil, and the starting is performed by detecting this induced electromotive force. Since the coil is demagnetized, unnecessary power consumption can be prevented.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram of an embodiment of the present invention, FIG. 2 is a sectional view of a solenoid valve 4 equipped with an electromagnet device 1, FIG. 3 is a waveform diagram of the voltage applied to the starting coil 2, and FIG. is an electromagnet r!
11, FIG. 5 is a waveform diagram to explain the behavior when the solenoid valve 4 opens due to excitation of the starting coil 2 and holding coil 3, and FIG. FIG. 4 is a waveform diagram for explaining IBJ when the solenoid valve 4 does not perform an IEI valve and remains closed even when energized. DESCRIPTION OF SYMBOLS 1... Electromagnet device, 2... Starting coil, 3... Holding coil, 4... Solenoid valve, 23... Power supply, 25...
・Main control circuit, 28...Auxiliary control circuit, 33...Level discrimination circuit Agent Patent attorney Number of strokes

Claims (1)

[Claims] Excitation of an electromagnetic device that moves a moving body made of ferromagnetic material by electromagnetic force generated by excitation of a starting coil, and holds the moved body by electromagnetic force generated by excitation of a holding coil. In the device, means for exciting a starting coil, means for exciting a holding coil at the same time as excitation of the starting coil, and then keeping the holding coil excited, and an induced electromotive force in the holding coil caused by movement of the moving body. and means for demagnetizing the starting coil by disabling the starting coil excitation means when induced electromotive force is detected in response to the output from the detecting means. Equipment exciter.