JPH09162033A - Drive method of solenoid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the power consumption of a solenoid. SOLUTION: When the operation state of a solenoid is to be held during a fixed time zone T, performing continuously a current application to the solenoid during a predetermined time zone T1 of the fixed time zone T, in the remaining time zone thereof, the current application to it is idle during a time zone T2 of a residual magnetic flux being present in it to make it hold its operation state by its residual magnetic flux. Then, starting again the current application to it before its residual magnetic flux is extinguished to generate a new magnetic flux, only during an enough time zone T3 to generate a new residual magnetic flux the current application to it is performed to make it continue its, operation state. Since in the current-application idle time zone T2 no power is consumed, its consumption power is reduced by the portion thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid driving method.

[0002]

2. Description of the Related Art Solenoids are classified into pull type, push type, and dual type depending on the type of use of output by a movable iron core. In either type, the movable iron core is operated by turning on and off power to a coil. There is no change in being a thing. Generally, in order to keep the operating state of the solenoid for a predetermined time period, the current is continuously applied to the solenoid for a time corresponding to this time period.

FIG. 3 shows a holding time period (T) of the operating state of a solenoid of the prior art and a time period (T) of energizing the solenoid.
0) is a time chart. In FIG. 3, the holding time period (T) of the operating state of the solenoid
On the other hand, the energization is performed for a fixed time period (T0), but when the energization to the solenoid is stopped, the movable iron core is returned to the original position by the return spring. In addition, between the energization time period (T0) and the solenoid operation time period (T),
There is a slight time lag.

[0004]

As described above, in order to maintain the operating state of the solenoid for a certain time period (T), the solenoid is continuously energized for the corresponding time period (T0). . This is a-b in FIG.
Power is consumed for the area surrounded by -c-d, and the longer the holding time, the larger the power consumption. In addition, in the case of a device equipped with a large number of solenoids, the total power consumption also increases, which causes a problem of energy saving of the device equipped with the solenoids.

[0005]

In order to solve the above-mentioned problems, the present invention focuses on the residual magnetic flux due to the induced current generated when the solenoid stops operating, and the residual magnetic flux does not affect the operating time of the solenoid. The power was turned off. Then, before the retention due to the residual magnetic flux became impossible, the energization was started again so that the continuous operating state could be maintained. As a result, since the power is not consumed during the power-off period, the solenoid can be kept in an operating state with a small power consumption as in the case of continuous power supply.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, when a solenoid is held in an operating state from a non-operating state for a certain period of time, the solenoid is continuously energized for the first predetermined time of the certain period of time. After that, the energization is intermittently stopped for a sufficient time to maintain the operating state by the residual magnetic flux.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the relationship between the energization for operating the solenoid and the operating state of the solenoid operated by this energization. The energization and the suspension of the energization as shown in FIG. A certain time period (T) as shown in (b) is shown by the relationship between the state in which the operating state is held and the time.

In FIG. 1A, when the solenoid is energized, the solenoid is put into operation by the magnetic flux induced by the coil attracting the movable iron core. In this operating state, the magnetic flux induced by the coil is stabilized by continuously energizing for a constant time (T1) between A and B, and the condition for producing the residual magnetic flux is set. When energization of the solenoid is started, as shown in FIG.
With a certain time lag between 1 and A2, it becomes active at point A2.

Next, the energization is turned off at a time point B when a certain time period (T1) has passed due to continuous energization, and the energization is stopped for the certain time period (B to C). This time period (T2) is a time period during which the residual magnetic flux due to the induced current exists, the magnetic flux does not immediately disappear even when the energization is stopped, and the solenoid still maintains the operating state. That is, even if the energization is stopped at the time point B, the magnetic flux remains until the time point B1 to keep the solenoid in the operating state.
On the other hand, the time zone (A2-B
If the power supply is newly started at the time point C in 1), the operation of the solenoid rises from C1 to C2 and the solenoid enters the operating state again. Therefore, the operating state due to the residual magnetic flux and the operating state due to the new energization are partially overlapped to obtain a continuous operating state. In this way, the operating state becomes continuous by setting the energization suspension time zone T2 sufficient to obtain continuous operating time. Subsequently, the solenoid is operated in an arbitrary time zone by intermittently deactivating electricity by repeating energization and de-energization such as energization in time zones C to D (T3) and deactivation in time zones D to E. Can be held at. In this way, when the energization is stopped at the time (Q) immediately before the elapse of a certain period of time (T), the operation stop is started at the point Q1 and the operation stop is completed at the point Q2.

In this manner, the energization is stopped while the residual magnetic flux continues to exist, and the solenoid is maintained in the operating state by energizing for a time zone (T3) other than the residual magnetic flux existence time (T2). Therefore, it is possible to reduce the power consumption during the power-off period. There is an error between the time zone T0 and the solenoid operation time zone T within the time lag range, but it is small, and since design adjustment is possible, there is no practical problem.

In the drawings, T1 and T3 are shown for convenience of explanation.
Although the time zone of is increased, the energization time zone (T1, T3
) Is reduced as much as possible and the time period (T2) during which the power supply is stopped is increased as much as possible, the power saving effect becomes large. However, since such a distribution of time zones causes a problem of a decrease in responsiveness of the solenoid and a decrease in holding force, it is desirable to determine in consideration of the balance with these characteristics.

Next, a clamping device for clamping an object (for example, a thin plate-shaped object such as a tape) by operating a pull type solenoid will be described with reference to FIG. The solenoid body 1 is composed of a coil and a movable iron core as in the prior art, and a connecting member 3 is connected to the tip of an operating shaft 2 which is integral with the movable iron core via a pin 2a. The connecting member 3 is connected to the tip of the lever 4 via the pin 4a. The lever 4 is swingably supported by the support member 5 by a pin 5a. The lever 4 is urged by a return spring 6 so as to return to the original position together with the operating shaft.

At the lower end of the supporting member 5, a claw portion 5b for holding an object is provided. In addition, a claw portion 4c engageable with a claw portion 5b of the support member 5 is provided on the inner side of the grip portion formed toward the outside at the lower end portion of the lever 4. In the above structure, when the solenoid body 1 is energized by a solenoid control circuit (not shown), the operating shaft 2 of the solenoid body retracts against the spring force of the return spring 6, and the base portion thereof is recessed in the solenoid body 1. . As a result, the lever 4 swings in the clockwise direction via the connecting member 3 as shown by the chain line. As a result, the object is gripped via the claws 4c and 5b. The gripping time of the tape corresponds to the time zone T as described above, and this time zone includes the time zone T2 of intermittent energization suspension (see FIG. 1).

Next, when the solenoid control circuit stops energizing the solenoid after the elapse of a predetermined time T, the attraction force to the movable iron core 2 is lost with the passage of the residual magnetic flux existence time, and the return spring 6 causes the lever 4 to move. At the same time, the movable iron core returns to its original position. At the same time, the claws 4c, 5
The engagement of b also becomes a disengaged state, and the object held by this is released. Then, when a predetermined time elapses, energization of the solenoid is started again, and the same operation as the above-described operation is repeated. In the above, the output type is the pull type, but the same can be applied to the push type and the dual type, and the size of the solenoid can be applied to various types. .

[0015]

According to the present invention, when the operating state of the solenoid is maintained for a certain period of time, the solenoid is energized continuously for the first fixed time, but thereafter, the energization is performed during the residual magnetic flux existence time. Since it is made to pause intermittently, the power consumption of the solenoid can be saved.

[Brief description of the drawings]

FIG. 1 is a time chart showing an operating state of a solenoid according to the present invention.

FIG. 2 is a front view of a main part of a clamp device using a solenoid.

FIG. 3 is a time chart showing an operating state of a solenoid according to a conventional technique.

[Explanation of symbols]

T A certain time period when the solenoid operates T1 A first time period when the current is continuously energized T2 A time period when the power is turned off T3 A time period when the solenoid is turned on to maintain the operating state

Claims (1)

[Claims] 1. When holding a solenoid from a non-actuated state to an actuated state for a certain period of time, the solenoid is continuously energized for the first predetermined time of the certain period of time, and then the residual magnetic flux is applied. The method for driving a solenoid is characterized in that the energization is intermittently stopped for a sufficient time to maintain the operating state.