KR20030091939A - Electromagnetic operating device - Google Patents

Abstract

A solenoid type electronic control device that requires a relatively large current only for a limited short period of time at the onset of excitation, and improves the speed and response at the onset of excitation without overloading the driving circuit and power supply. There is provided an electronic control apparatus having a split coil configuration capable of achieving the above-described characteristics and coping with power savings. The electronic control device which applies a mechanical output to the valve body against a spring force includes a solenoid coil composed of a plurality of split coils electrically independent of each other, and a magnetic flux in which the magnetic flux generated in each split coil flows in common. An iron core structure consisting of a fixed core, a movable core and a yoke coupled to a solenoid coil to form a magnetic path loop, and an excitation controller for selectively switching control of energization for each split coil. And a transmission mechanism for transmitting the mechanical output to the valve body based on the displacement of the movable iron core magnetically attracted to the fixed iron core when one or more split coils are excited.

Description

Electronic Control Unit {ELECTROMAGNETIC OPERATING DEVICE}

BACKGROUND OF THE INVENTION As electronic control devices in various electromagnetic control valves including switching valves and proportional valves, various types of electric and mechanical converters for causing a mechanical output to act on the valve body against spring forces are known. Among them, electromagnet devices using solenoid coils, and electromagnetic plungers, commonly referred to as solenoid devices, have been widely used for the electromagnetic operation valves, and studies of power saving and compact weight reduction have been variously proposed.

In this type of solenoid device, a solenoid coil is provided in an iron core structure composed mainly of a fixed iron core, a movable iron core, and a yoke, and magnetic flux generated from an excited solenoid coil is generated. By flowing in the magnetic path formed by the iron core structure, the movable iron core which forms a void in the magnetic path with respect to the fixed iron core is attracted to the fixed iron core, and the movable iron core at this time The mechanical output based on the displacement of is transmitted to the valve body through, for example, a push lot or a coil spring.

Conventionally, various experiments and studies have been conducted to improve the responsiveness by speeding up the operation of the solenoid device by the solenoid device, but most of them have a small electrical time constant (λ = L / R). Regarding the selection of the coil standard and the design of the coil to cope with driving at a relatively high power supply and voltage, from this point of view, it is no exaggeration to say that the structure of the current solenoid device is in a mature area. .

For various solenoid valves that perform a proportional excitation operation such as a simple on / off operation such as a switching valve or a proportional valve, the coil winding number is reduced to reduce the coil time constant of the solenoid device for the purpose of improving the responsiveness. However, in order to generate the same magnetic attraction force as the original coil, the coil must increase the exciting current in accordance with the principle of ampere turn (AT) constant. For example, when a solenoid coil of 1000 turns of coils is assumed, it is composed of two split coils of 500 turns of coils of 1/2 equally, and these split coils are connected in parallel. The responsiveness is improved when operating in the same way. However, in order to obtain the same suction force as in the case of the solenoid coil of 1000 turns of coil, the power supply current supplied to the parallel composite coil is doubled, and the driving circuit and power supply of the solenoid device are In addition to the increased power burden to be undertaken, the power loss and electromagnetic induction noise in the wiring or coil also increases. Therefore, the use of solenoid coils with a small number of coil windings is effective for speeding up the operation and improving the responsiveness. However, coils with excessively large driving current are not practical in practical use.

In particular, the on / off actuation solenoid device such as a switching valve needs to supply a relatively large exciting current in order to apply sufficient magnetic attraction force to the movable core which is separated from the fixed core in the initial stage of excitation. After the valve is switched, only a relatively low current value is required only to keep the movable core in the adsorption state, and if the excitation is continued with the same excitation current, waste of power cannot be ignored. For this reason, in the past, studies have been conducted to lower the excitation current by inserting a resistor in series with a coil when a certain time has elapsed. However, since the power consumed by the resistor is dissipated as heat, the power saving effect seen from the power supply side There is also a difficulty in that it is difficult to obtain and when this time-out operation is performed using a semiconductor element such as a transistor, a large element having a large power capacity is required.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic control device, and more particularly, to an electric / mechanical converter composed of an electromagnet device by a solenoid coil, for driving and operating a valve body of a solenoid valve or a proportional solenoid control valve at a mechanical output against a spring force. In particular, the present invention relates to an electronic operation device suitable for power saving, high speed of operation, or improvement in response.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing which shows schematic structure of the electronic control apparatus which concerns on one Embodiment of this invention.

2 is a schematic circuit diagram showing an example of the configuration of an excitation controller.

Fig. 3 is a diagram showing the current step response characteristics of the split coil, with the vertical axis representing current I [A] and the horizontal axis representing time T [msec].

4 is a schematic circuit diagram showing another configuration example of an excitation controller.

5 is a schematic circuit diagram showing still another configuration example of an excitation controller.

Fig. 6 is a PWM pulse waveform diagram over time for explaining the operation of the pulse width modulation circuit.

Fig. 7 is an explanatory diagram schematically showing a change in current flowing through a split coil to be controlled by PWM output pulse, with the vertical axis representing the current I and the horizontal axis representing the time T.

Fig. 8 is an explanatory diagram showing a schematic configuration of an electronic operating apparatus influencing another embodiment of the present invention.

The main object of the present invention is a solenoid type electronic control device which requires a relatively large current only in a limited short period of the initial stage of excitation, as described above. The solenoid coil is composed of split coils, and the power burden of the driving circuit and power supply is excessively increased. The present invention provides an electronic control device capable of achieving high speed and improved response at the time of starting an excitation. Another object of the present invention is to provide an electronic operation apparatus that can effectively cope with power saving with the same configuration. Another object of the present invention is to provide an electromagnetic operation valve having such an electronic operation device as an electric / mechanical converter for driving the valve body.

The electronic control device according to the present invention is a plurality of split coils electrically independent of each other in an electronic control device as an electric / mechanical converter that applies a mechanical output to a valve body against a spring force in order to achieve the above objects. A solenoid coil, a fixed core, a movable core, and a yoke, combined with a solenoid coil so as to form a magnetic loop through which the magnetic flux generated in each split coil flows in common, and energizing each split coil selectively An excitation controller for switching control and a transmission mechanism for transmitting the mechanical output based on the displacement of the movable iron core magnetically attracted to the fixed iron core when one or more split coils are excited are provided.

That is, in the electronic control apparatus of the present invention, even if any one of the plurality of split coils, the magnetic flux flows to the common iron core structure, and the magnetic attraction force acting on the movable iron core can be transmitted to the valve body as a mechanical output. For example, it is possible to selectively change the number of split coils to be excited at the same time, or to switch the split coils to split coils having different time constants, and to set the magnitude of the excitation current each time. It is possible to achieve higher speed and better responsiveness, or to achieve power saving after switching, and to reduce the number of excitation coils after each period of initial excitation. Alternatively, this can be done by switching the coil to be excited. Even if the switching of the excitation coil is performed as a semiconductor switching element, the switching element performs an operation to cut off after a short conduction period, so that a large power loss element must be used. Therefore, the electrical component box containing it is also sufficient as a normal small terminal box which can be mounted on the case of the solenoid coil.

The electronic control apparatus of the present invention can be applied to any of on / off operation and proportional operation. According to one preferred aspect, the split coil is formed by a plurality of split coil layers divided in the thickness direction of the wound layer of the solenoid coil. According to another preferred form, the splitting coil is constituted by a plurality of short solenoids which are arranged overlapping each other in the axial direction of the solenoid coil. In addition to this, it is also possible to configure each split coil with each center line conductor by winding a coil as each center conductor of two or more centers, for example. In addition, in the present invention, each split coil may have substantially the same standard as each other, or may include a plurality of split coils having different electrical standards. For example, in the case of proportional control, if each split coil is sequentially excited by time division, and the driving force of the split coil total is maintained as a result of using the driving energy according to the current of each split coil. In the case of good on-off control, in order to obtain the rated thrust at the beginning of excitation, a plurality of split coils are simultaneously excited in parallel, and the excitation by the next holding current is applied to the power level to be maintained. The energy savings can be achieved by splitting the excitation as many as the number of coils corresponding to the number of amp turns.

According to an aspect of the present invention, the excitation controller includes a switching circuit for time-dividing each split coil in order. This makes it possible to time-divid each split coil in particular during rated operation to obtain rated thrust with relatively low power consumption, and to avoid overloading the power supply at the time of rated thrust generation. In this case, preferably, the excitation controller may simultaneously excite a plurality of split coils in parallel over a limited period of the initial start of the excitation, whereby a high repulsive force can be obtained at a high responsiveness only during the initial start of the excitation.

According to another aspect of the present invention, the excitation controller simultaneously excites a plurality of split coils in parallel for a limited period of time during the beginning of the excitation, and then substantially blocks the excitation of the at least one split coil therein. It includes a time circuit that maintains the excitation state of the split coil. This effectively reduces the time constant of the solenoid coil during parallel excitation and, for example, provides a relatively parallel split coil having a relatively small time constant during periods when a large initial force is required when the solenoid coil is used as an electromagnetic control device. It is possible to achieve power saving by exciting with a relatively small current in order to excite the switching of the solenoid valve at a high speed and to maintain the switching state in a single or series state after the completion of the switching.

In particular, in the case of the proportional control, the excitation controller may include a current amplifier circuit for generating an excitation current having a magnitude according to the command current value given from the outside.

In the proportional control electronic control device according to another aspect of the present invention, preferably, each split coil is substantially the same in electrical specification, and the excitation controller is configured to switch the excitation current to each split coil. A plurality of semiconductor switching elements, a pulse width modulation circuit for switching each semiconductor switching element periodically in sequential pulse current control as a phase difference depending on the number of split coils in accordance with a synchronization signal, and a command current supplied from the outside And a current amplifier circuit for generating an excitation current having a magnitude corresponding to the value, and changing the output pulse width of the pulse width modulation circuit by the output of the current amplifier circuit according to the command current value, It is comprised so that it may change according to the said output pulse width.

As a result, in the limited period of the initial stage of excitation, when the maximum thrust command current value larger than the normal thrust command current value for proportional control is given, the output pulse width of the pulse width modulation circuit is expanded, so that each semiconductor As the operation time of the switching element is overlapped, and as a result, the split coils are simultaneously excited in parallel, a high responsiveness is obtained which is equivalent to that of a solenoid coil with a low coil resistance and a low number of coils. Improve the sex.

When the command current value is lowered to the normal thrust command current value, which is the value set for the original proportional control, after the elapse of the limited period, the output pulse width of the pulse width modulation circuit is also shortened, thereby reducing the overlap of the operating time of each semiconductor switching element. As the excitation timing of each split coil, i.e., the operation cycle and phase difference of each semiconductor switching element at this time, the excitation current flowing in order to each split coil is viewed from the power supply side, it is equivalent to a non-split coil configuration. By designing in advance so as to be equal to the excitation current that should flow through the solenoid coil, the averaging of the current and the power supply current of the entire solenoid coil can be maintained equal to that of the non-dividing current peak. It is possible to effectively improve the responsiveness without overloading the burden.

In this case, when the command current value corresponds to the maximum thrust command current value at the initial stage of excitation, the overlap of the operating time of each semiconductor switching element is maximized, and when the command current value corresponds to the normal thrust command current value for proportionally controlling the command current value. The excitation controller may further include a synchronous circuit for controlling the current period and phase difference of the pulse width modulation circuit so as to substantially eliminate the overlap of operation time of each semiconductor switching element.

In still another aspect of the present invention, the split coil includes a first split coil and a second split coil having different electrical standards, and the first split coil and the second split coil have different coil time constants. have.

When the coil time constant of the second split coil is smaller than the coil time constant of the first split coil, the solenoid coil is characterized in that the line diameter of the second split coil is larger than the line diameter of the first split coil, Alternatively, the number of turns of the second split coil may be smaller than that of the first split coil, or both of them. In either case, the wound layers of these split coils may be concentrically shaped. It is possible to laminate, and particularly preferably, the wound layer of the other split coil may be laminated on the outer circumference of the wound layer of the split coil on which the calorific value increases due to the excitation condition.

When the split coils having different electrical specifications are included in this manner, the excitation controller excites the second split coil to the first current value over a limited period of initial start of the excitation, and then excites the second split coil substantially. And a current switching circuit for exciting the first split coil to a second current value which is lower than the first current value. In the period when the initial large force is required, the number of windings is relatively small, and the small second split coil of time constant is excited as a large current to switch the solenoid valve at high speed, and after the completion of switching, The excitation can be cut off to excite the first split coil to a relatively low current value for maintaining the switching state, and power saving can be achieved without using a resistor that generates unnecessary power consumption.

In addition to the current switching circuit, a current amplifier circuit for generating an excitation current having a magnitude corresponding to an externally given command current value may also be provided, whereby it is used as an electronic control device of a proportional solenoid control valve, for example. In addition to the proportional control operation, similar responsiveness can be achieved.

In the present invention, particularly in the proportional control electronic operation apparatus, current detection means for detecting the magnitude of the load current flowing through the solenoid coil and the current amplifying circuit are fed back by the detected current value of the current detection means. It may also be provided with a current feedback circuit.

Similarly, in the electronic control apparatus for proportional control, a magnetic sensor for detecting the strength of the magnetic field generated in the solenoid coil and a magnetic feedback circuit which feeds back to the current amplifying circuit by the detection output of the magnetic sensor are provided. It may also be provided.

Similarly, in the case of the electronic control apparatus for proportional control, it is also possible to further include a displacement sensor for detecting the displacement amount of the movable iron core, and a position feedback circuit which feeds back to the current amplifier circuit by the detection output of the displacement sensor.

The present invention also provides an electronic control valve including the electronic control device according to the present invention described above, in which case the electronic control valve according to the present invention controls the fluid pressure or the flow rate, and switches the flow direction of the fluid. Alternatively, the mechanical output of the electronic control device is acted on the valve body for controlling the opening and closing of the flow path, thereby improving the responsiveness and / or power saving of the operation of the valve body.

The above and other features and advantages of the present invention will be apparent from the description of the embodiments to be described below with reference to the accompanying drawings showing some preferred examples.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described with reference to the drawings. Fig. 1 is an explanatory view showing a schematic configuration of an electronic operation apparatus according to an embodiment of the present invention, and this embodiment is a spool valve of a proportional electromagnetic control valve. This is the case of proportional motion type which drives main body (V) against spring force.

As shown in the drawing, the electronic control apparatus includes a solenoid coil 10 made up of a plurality of split coils 10a to 10d electrically electrically separated from each other, and a magnetic flux flowing through the split coils in common. Selectively switching the energization of each of the split coils, an iron core structure composed of a fixed iron core 11, a movable iron core 12, and a yoke 13 coupled to the solenoid coil 10 so as to form a loop. When the excitation controller 14 to control and any one or more split coils are excited, the mechanical output is generated based on the displacement of the movable core 12 magnetically attracted to the fixed core 11. The proportional solenoid device provided with the transmission push lot 15 to an electric charge is comprised.

The excitation controller 14 can take various circuit configurations, and is housed in the electrical component box 16 mounted on the case of the solenoid coil 10 in the example of FIG. Also connected to the end of the push lot 15 is a differential transformer-type displacement sensor 17 which detects the displacement amount or position of the movable iron core 12 and gives a feedback signal to the excitation controller.

In the present embodiment, the solenoid coil 10 is arranged in such a manner that the split coils 10a to 10d, which consist of four short solenoids, are superposed in the axial direction of the solenoid. It is For example, when a solenoid coil having a rated thrust of 54 N (hereinafter referred to as an equivalent solenoid coil is referred to as a standard coil) at a rated voltage of 24 V and a rated coil resistance of 10 Ω, Each of the split coils 10a to 10d in the case of the split number 4 is composed of short solenoids having a coil resistance of 2.5 Ω, and when both of them are simultaneously excited in parallel, the composite coil resistance seen from the power source is 0.625 Ω. .

Of course, the split coil may be divided into a wound layer and the number of splits is not limited to four. For example, in case of equal split, if the standard coil of equal rating is divided into 2, the coil resistance of each split coil is 5Ω, the parallel composite coil resistance is 2.5Ω, and in the case of 6 splits, the coil resistance of each split coil is 1.667Ω. The parallel composite coil resistance at is 0.278Ω.

In the split coil, all split coils are excited in series connection state by the excitation controller 14 during the rated operation. For example, if the current value at the time of occurrence of the rated thrust of the standard coil is referred to as the reference current, the current value flowing through each split coil in the series excitation state is the same as the reference current, and the power supply current remains the reference current. .

On the other hand, at the beginning of the excitation, each split coil is excited in parallel connection state for a limited period after the excitation start by the control by the excitation controller 14. At this time, the current value flowing through each split coil is also equal to the reference current, so the power supply current in this case is several times the coil division of the reference current. In this way, by simultaneously exciting the split coils in the initial stage of excitation, the time constant of the solenoid coil 10 is temporarily reduced to achieve high driving speed and high response.

In this case, as shown in Fig. 2, the excitation controller 14 performs simultaneous parallel excitation of a plurality of split coils over a limited period of the initial start of the excitation, and then parallel and serial switching for serial excitation of all split coils. The circuit 21 is included. As a result, during rated operation, all split coils can be excited in series to obtain rated thrust, and a plurality of split coils can be excited in parallel for only a short time at the beginning of the excitation to obtain high thrust force with high responsiveness. In this case, the overload of the power supply at the time of the rated thrust generation can be avoided.

In addition, the excitation controller 14 shown in FIG. 2 receives the position feedback signal Vf from the displacement sensor 17 and at the same time receives the current command Is for proportional control and generates an excitation current of a corresponding magnitude. The amplifier 22 and a current detection resistor 23 for detecting a load current flowing through each split coil and feeding back as a negative feedback amount to the input of the current amplifier 22 are also included.

The current step responsiveness of a typical solenoid coil is represented by following formula (1).

Here, I is the coil current [A], V is the power supply voltage [V], R is the coil resistance [Ω], L is the inductance [H], and the coil time constant tau = L / R [sec].

Table 1 shows the results of comparing the improvement effect of the response by the parallel excitation of the split coils to each coil split in comparison with the standard coils of various coil winding numbers (t).

In the table, " time " indicates the rise time from the power supply to the current value generating the rated thrust in each case as the ratio with the rise time in the standard coil. For example, with a standard coil, the current value of 1A means the relative time ratio until it reaches 2A in the division number 2 and 4A in the division number 4. In addition, "ratio" shows the ratio of the speedup of the response speed achieved by shortening of the rise time.

Table 1

ST. SOL 1100t-10Ω 1500t-18Ω 1720t-23Ω N time ratio time ratio time ratio One One One One One One One 2 0.43 2.35 0.4 2.5 0.39 2.6 4 0.2 5.0 0.19 5.4 0.18 5.6 6 0.13 7.8 0.12 8.2 0.11 8.8

3 shows the measurement results of the current step response characteristics of the split coil and the standard coil when the power supply voltage 24V is applied. The vertical axis shows the load current I [A], and the horizontal axis shows the elapsed time T [msec] from the time of voltage application. In any number of divisions, the total number of windings is the same as the coil and the standard coil formed from the parallel configuration of the division coils. In the standard coil Ls, the rise time until the load current reaches the rated current Ir (= 1A) is about 18 msec.However, in the coil L2 (parallel excitation) of division number 2, the load current corresponds to the reference current value. The rise time until reaching 2 A is about 7.7 msec, and in the coil L4 (parallel excitation) of division number 4, the rise time until reaching the corresponding reference current value 4A is shortened to about 3.6 msec.

In this way, by simultaneously exciting a plurality of split coils in parallel within a limited period of an order of less than 10 msec at the same time, a high-speed rise is achieved, thereby improving responsiveness. After this period, the excitation controller 14 switches to series excitation to excite all split coils in series connection, but the current value for showing the rated thrust equal to that of the standard coil is the reference current value of the standard coil for each split coil. For example, 1A may flow, so that the burden on the power supply side is not more heavy than when using a standard coil, and the current value flowing in each split coil is the same even during the limited period of initial excitation and the rated operation period. Stable control is possible by detecting the current flowing in any one of the divided coils having the same characteristics by applying the current detection resistor 23 and applying feedback.

4 shows another configuration example of the excitation controller, in which case the coil division is 2, and the excitation controller 14a simultaneously performs parallel excitation of the two split coils 10A and 10B over a limited period of time at the beginning of the excitation. Then, a time circuit 41 is provided which substantially blocks the excitation of one of the split coils 10B and maintains the excited state of the remaining split coils 10A. Of course, the number of coils may be other than two, and the number of split coils to be parallel-excited and the number of split coils to be cut off next can be appropriately selected. The time circuit 41 is not limited to a circuit configuration in which a timer circuit formed by the resistor R and the capacitor C is coupled to the switching transistor Tr as shown in FIG. 4, and various analog or digital circuits are used. It is not necessary to explain that modifications can be made by technology.

In Fig. 4, the transistor Tr is a switching transistor for turning on and off the current flowing in the split coil 10B by opening and closing the power switch SW. The capacitor C is charged immediately after the power is turned on. Is not accumulated, the voltage between the base and the emitter is high, so that the transistor Tr is in a conducting state, and the split coils 10A and 10B are simultaneously excited in parallel. When the capacitor C is charged by the base current according to the conduction of the transistor Tr, and the charge potential rises to the vicinity of the power supply voltage after a lapse of the time defined by the RC time constant, the transistor Tr blocks and the split coil ( 10B) is cut off substantially. When the power is cut off, the charge charge of the capacitor C is discharged through the diode D, and the timer circuit returns to the initial state.

In this way, two split coils 10A and 10B are parallel-excited only at the beginning of the excitation period to obtain high repulsive force with high responsiveness, and then the excitation of one split coil 10B is cut off to separate the remaining splits. Thrust necessary for excitation of the coil 10A alone can be obtained. In this case, if the electrical specifications and power characteristics of each split coil are selected to generate the rated thrust in the parallel excitation state, the split cores are driven by the split coils at the same time as the excitation starts, and the movable core is driven with sufficient thrust and fast rising characteristics. After the iron core is completed, it can be a low current corresponding to the load current of only one split coil as the holding current for maintaining the state, and the purpose of high response and power saving can be achieved. .

In addition, the thinking method of the excitation controller 14a shown in FIG. 4 can be used not only for the on / off operation but also for the proportional operation. In this case, as in the case of FIG. A current amplifier for generating an excitation current of magnitude and a current detecting means for detecting a load current flowing through the split coil 10A as necessary and feeding back as a negative feedback amount to the input of the current amplifier may be provided. In this case, if the coil standard is selected so that the rated thrust is generated by the excitation of only one split coil 10A, and the power supply capacity can cope with the relatively large instantaneous current of the initial stage of excitation, the rising speed can also be achieved. Can be.

5 shows another embodiment of an excitation controller. In this embodiment, the split coils are four equally divided split coils 10a to 10b as shown in Fig. 1, and the excitation controller 14b is also in proportional motion. In addition, DC power is supplied from the driving power supply to the terminal V +.

That is, as shown in Fig. 5, the excitation controller 14a supplies a plurality of switching transistors Tr1 to Tr4 for switching the excitation current to each of the divided coils, and the synchronization signal supplied from the synchronization circuit SYNC 54. Therefore, the pulse width modulation circuit (PWM) 51 which drives each switching transistor periodically as a sequential pulse current control as a phase difference according to the number of split coils, and the position feedback signal from the displacement sensor 17 ( A current amplifier circuit 52 that receives Vf) and generates an excitation current according to a given current command Is from the outside, and a load current flowing through the solenoid coil are detected, and a negative feedback amount is applied to the input side of the current amplifier 52. And a current detecting resistor 53 for feeding back, changing the PWM output pulse width of the pulse width modulation circuit 51 by the output of the current amplifier circuit 52 according to the value of the current command, and operating time of each switching transistor. Width It is adapted to change in accordance with the period the output pulse width.

When the current command corresponds to the maximum thrust command current value at the start of the excitation, the synchronous circuit 54 maximizes the overlap of the operating time of each switching transistor, and the normal thrust command current for the current command to perform proportional control. In response to the value, the current period and the phase difference of the pulse width modulation circuit 51 are controlled so as to substantially eliminate the overlap of operation time of each switching transistor.

In the proportional control operation by the excitation controller 14b, for example, a current command of a desired excitation current change pattern is given from an external programmable controller. In this case, since the number of split coils is N = 4, the current command commands a current value of up to four times the normal maximum thrust generation over a limited period of initial excitation starting, and then for normal thrust generation for proportional control. Give the command lowered to the current value of. Also in this case, the excitation controller 14a simultaneously energizes the split coils in parallel at the time of high force operation, drives the synthesized parallel coil resistance to one-half of the number of divisions, and maintains the suction force. Turn is not changed, and the current flowing through one split coil is to be always maintained.

As shown in Fig. 6, the pulse width modulation circuit 51 generates four-phase PWM output pulses synchronized with a phase difference of 90 degrees according to the number of split coils N = 4. Switching control of Tr1 to Tr4). The unit period of the PWM output pulse of each phase is shown as Ps in FIG. The output pulse width of each phase is modulated according to the current command, so that the pulse width becomes wider when the current command is a large current so as to be indicated by an arrow B in the middle, and when the current command becomes a small current, the pulse width is Narrows. When the current command is the maximum current, the pulse width of the pulse output of each phase becomes 100% pulses as well as the period. Therefore, in this state, all the transistors are simultaneously conducted so that the split coils 10a to 10d are simultaneously excited in parallel. In the limited period of the initial stage of the excitation, such a large current command is transiently given, whereby the load current viewed from the power supply side becomes a sum of the currents flowing through each of the split coils. High response is achieved.

When the current command falls to the current value for generating normal thrust, each split coil is time-divided into the four-phase period according to the PWM output pulse of the pulse width modulation circuit 51, and the average power supply current generates the rated thrust. It can be suppressed by the electric current value for following. This state is shown typically in FIG. As shown in Fig. 7, the apparatus generates instantaneous maximum thrust as a relatively large current in the period M, and in the subsequent period N, the apparatus generates the rated thrust force required at normal times with a relatively low current. Doing.

In each embodiment of the proportional control described above, a magnetic sensor such as, for example, a hall element is disposed in the fixed core 11 for stable excitation control, and the magnetic field generated from the solenoid coil ( It is desirable to detect the intensity of i) and feed it back to the input of the current amplifier in the excitation controller.

8 is an explanatory view showing a schematic configuration of an electronic operation apparatus according to another embodiment of the present invention, the present embodiment is the on / off operation type to drive the valve body (V) of the solenoid valve against the spring force Is the case.

As shown in FIG. 8, this electronic control apparatus has the solenoid coil 80 which consists of the 1st split coil 80a and the 2nd split coil 80b electrically independent of each other, and the magnetic flux which generate | occur | produces from each split coil. An iron core structure composed of a fixed iron core 81, a movable iron core 82, and a yoke 83 coupled to the solenoid coil 80 so as to form a common flow path, and energization of each split coil ( The mechanical body outputs the mechanical output based on the displacement of the excitation controller 84 for selectively switching and controlling the moving force, and the movable core 82 which is magnetically attracted to the fixed core 81 when one or more split coils are excited. Is provided with a transfer push rod (85) for delivery.

The excitation controller 84 can take various circuit configurations, and is housed in an electrical component box 86 mounted on the case of the solenoid coil 80 in the embodiment of FIG. Moreover, the pin 88 for moving the movable core 82 by hand is arrange | positioned at the end side of the push rod 85. As shown in FIG.

The split coils 80a and 80b form two coil layers divided in the thickness direction of the wound layer in this embodiment, and the second split coils 80b are compared with the first split coils 80a. The coil diameter is large and the number of turns is small, so the coil time constant is smaller in the second split coil 80b. In other words, the second split coil 80b is a coil which sends a relatively large current over a limited period of the initial stage of excitation. The second split coil 80b has a periphery of the first split coil 80a in consideration of heat generation by a large current. ) The layers rolled up are overlapped. Of course, there is no explanation that the same function can be obtained by using any of the split coils on the outer circumference other than the heat sink.

As the configuration of the excitation controller 84 in this case, for example, an excitation switching circuit by the time circuit 41 as shown in FIG. 4 is applicable. That is, only a short time in the beginning of the excitation, the first and second split coils 80a and 80b are excited in parallel to obtain high thrust with high responsiveness, and then a second split coil ( 80b) to block the woman to obtain the required thrust in the woman only the first split coil (80a). The second split coil 80b has a small time constant, and therefore the initial responsiveness is particularly improved.

In this embodiment, although the first split coil 80a is composed of a normal coiling motion and the second split coil 80b is composed of one split coil each as a high speed starting coil, for example, for high speed starting. It goes without saying that the split coils may be composed of a plurality of parallel-connected split coils, or the normal moving split coils may be formed by combining a plurality of split coils having different electrical specifications.

In addition, each of the above embodiments and modifications only shows typical embodiments of the present invention, and for example, the extraction of various technical ideas according to the present invention disclosed in the respective examples is alternately combined, or the like. It should be understood that all modifications apparent to those skilled in the art belong to the technical scope of the present invention.

As described above, in the electronic control apparatus according to the present invention, even when any one of the plurality of split coils is excited, the magnetic flux flows through the common iron core structure, and the magnetic attraction force acting on the movable core can be transmitted to the valve body as a mechanical output. Therefore, the excitation controller can, for example, selectively change the number of split coils to be excited at the same time, or switch the excitation to the split coils having different time constants, and set the magnitude of the excitation current appropriately each time. In this way, the operation at the start of excitation can be speeded up and the response can be improved, or the power saving after switching can be achieved. This can be done by reducing the number of coils or switching the coils, which is a waste compared to the case of inserting a series resistor. Even if the power consumption can be reduced and the switching of the excitation coil is performed as a semiconductor switching element, the switching element performs the operation of shutting off after a short conduction period, so it is not necessary to use a large power loss element. Therefore, it is possible to exert a remarkable effect, such that an electrical component box for storing it is also sufficient as a normal small terminal box that can be mounted on a case of a solenoid coil.

Claims (19)

In an electronic control device as an electric / mechanical converter that applies a mechanical output to a valve body against a spring force, A solenoid coil that is a plurality of split coils that are electrically independent of each other, and a fixed core, a movable core, and a yoke that are coupled to the solenoid coil so as to form a magnetic loop in which the magnetic flux generated in each split coil flows in common. A mechanical output based on the structure, an excitation controller for selectively switching and controlling the energization of each of the split coils, and a displacement of the movable core that is attracted to the fixed iron core when one or more split coils are excited. Electronic control device characterized in that it comprises a transmission mechanism for transmitting to the valve body. 2. The electronic operating apparatus according to claim 1, wherein the split coil is a plurality of split coil layers divided in a thickness direction of a wound layer of a solenoid coil. The electronic operating apparatus according to claim 1, wherein the split coils are formed as a plurality of short solenoids arranged so as to overlap each other in the axial direction of the solenoid coil. 4. The electronic operating apparatus according to claim 2 or 3, wherein each of the split coils has substantially the same standard as each other. The electronic control apparatus according to any one of claims 1 to 4, wherein the excitation controller includes a switching circuit which performs time division excitation on each of the split coils in order. 5. The excitation controller according to any one of claims 1 to 4, wherein the excitation controller simultaneously excites a plurality of split coils in parallel over a limited period of time during the initial stage of excitation and then excites at least one of the split coils. An electronic control device comprising a time limit circuit that substantially blocks and maintains an excitation state of the remaining split coils. The electronic operation device according to any one of claims 1 to 6, wherein the excitation controller includes a current amplifier circuit for generating an excitation current having a magnitude corresponding to a command current value supplied from the outside. 6. The pulse excitation circuit according to claim 5, wherein the excitation controller performs a sequential pulse current on each of the semiconductor switching elements as a phase difference depending on the number of split coils according to a plurality of semiconductor switching elements for switching the excitation current for each split coil. A pulse width modulation circuit for switching and driving as a control, and a current amplifier circuit for generating an excitation current having a magnitude corresponding to the command current value supplied from the outside, and pulsed by the output of the current amplifier circuit according to the command current value. And an output pulse width of the width modulation circuit, and an operation time width of each semiconductor switching element to be changed according to the output pulse width. 9. The method according to claim 8, wherein the excitation controller is configured such that when the command current value corresponds to the maximum thrust command current value of the initial start of the excitation, the overlap of the operation time of each semiconductor switching element is maximized, and the command current value is proportional. When corresponding to the normal thrust command current value for control, the circuit further includes a synchronization circuit for controlling the current cycle and phase difference of the pulse width modulation circuit so as to substantially eliminate overlap of operation time of each semiconductor switching element. Electronic operation apparatus, characterized in that. 4. The split coil according to claim 2 or 3, wherein the split coil comprises a first split coil and a second split coil, and a coil time constant of the first split coil and a coil time constant of the second split coil are different from each other. Electronic operation device. The electronic control apparatus according to claim 10, wherein the coil time constant of the second split coil is smaller than the time constant of the first split coil. 12. The electronic control apparatus according to claim 11, wherein a line diameter of the second split coil is thicker than a line diameter of the first split coil. The coil wound layer of the other coil is laminated concentrically in the outer periphery of the coil winding layer of any one of the said 1st split coil and the 2nd split coil, Electronic operation apparatus characterized in that. The excitation controller according to any one of claims 11 to 13, wherein the excitation controller excites the second split coil to the first current value for a limited period of time during the initial start of the excitation, and then the excitation of the second split coil. And a current switching circuit for substantially blocking and exciting the first split coil to a second current value lower than the first current value. 15. The electronic control apparatus according to claim 14, further comprising a current amplifier circuit for generating an excitation current having a magnitude in accordance with the externally given command current value. 16. The detection current value according to any one of claims 7 to 9 or 15, wherein the excitation controller detects the magnitude of the load current flowing through the solenoid coil, and the detection current value of the current detection means in the current amplifier circuit. And an electric current feedback circuit for applying negative feedback according to the present invention. The magnetic sensor according to any one of claims 7 to 9, 15 or 16, which detects the strength of the magnetic field generated in the solenoid coil, and negative feedback according to the detection output of the magnetic sensor to the current amplifier circuit. And an electronic feedback circuit for hanging. The position feedback according to any one of claims 7 to 9 or 15 to 17, wherein the displacement sensor detects the displacement amount of the movable iron core and the negative feedback is applied to the current amplifier circuit according to the detection output of the displacement sensor. An electronic operating apparatus, further comprising a circuit. 19. The mechanical output according to any one of claims 1 to 18 against a spring force to a valve body for controlling the fluid pressure or flow rate, changing the flow direction of the fluid, or opening or closing the flow path. An electric / mechanical converter for actuating a pressure, comprising an electronic control device.