Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Including means for using – or compensating for – the induced...
Patent
1987-05-27
1990-02-27
Hix, L. T.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Including means for using, or compensating for, the induced...
361187, H01F 708
Patent
active
049051210
DESCRIPTION:
BRIEF SUMMARY
FIELD OF TECHNICAL ART
The present invention generally relates to an operation confirming device for electromagnetic actuator which can electrically confirm mechanical shift of a movable core of the electromagnetic actuator or of mechanism connected to the movable core caused by applying electric energy to the electromagnetic actuator.
BACKGROUND TECHNIQUE
A conventional device for confirming shift operation of a movable core of electromagnetic actuator has commonly employed an electric point mechanically connected to a movable core of the actuator. However, such conventional device has essentially provided following demerits or problems.
(1) Mechanism for connecting between the electromagnetic actuator and the electric point is complicated.
(2) The electric contact point has inherent demerits; that is, treatments for water proof, dust proof, moisture proof are complicated, and a lifetime of this electric contact point on account of influence of contact repetition should be considered.
(3) Switching operation of this electric contact point is checked through an electric signal, so that an extra power source and an electric wire for transmitting such signal are additionally required.
(4) The above mentioned problems make the manufacturing cost of this electromagnetic actuator increase.
DESCRIPTION OF THE INVENTION
Therefore, the present invention has been proposed in order to overcome the above mentioned problems. It is an object of the present invention to provide an operation confirming device for electromagnetic actuator, whose construction is simple and durable with low manufacturing cost.
To accomplish the above mentioned object, the operation confirming device for electromagnetic actuator, which is adapted to the electromagnetic actuator comprising a stationary core, a movable core facingly arranged with respect to the stationary core so that the movable core can be moved close to or apart from the stationary core and formed in a closed magnetic circuit together with the stationary core, and an electric coil wound around the closed magnetic circuit; is characterized that the operation confirming device is provided with a movable core shift detector for detecting time when shift operation of the movable core with respect to the stationary core by applying DC current to the electric coil is completed, by means of transitional fluctuating wave of the applied DC current.
The present invention can provide the following effects and thus will avail to various industries and private uses.
(1) The device can remove contact point, so that the reliability of operation confirming for electromagnetic actuator can remarkably improved.
(2) The mechanism or device attached to electromagnetic actuator for operation confirming can be simplified, and thus the whole structure of the device will become simple.
(3) The electric wire for electric signal to perform the confirming operation, always required in the conventional devices, can be eliminated by arranging the movable core shift detector at an operating wire for controlling the electromagnetic actuator near by the power source. Therefore, the present invention can be broadly used for a remote controlled electromagnetic actuator to provide excellent economic advantages.
(4) The present invention can contribute to decrease the size, weight and cost of the operation confirming device for electromagnetic actuator, and to improve reliability thereof.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a schematic illustration for explaining the first embodiment of the present invention;
FIG. 2 is a circuit diagram showing the composition of the movable core shift detector which is a component of the first embodiment shown in FIG. 1;
FIG. 3 is a graph showing various signal waves generated by the device of first embodiment shown in FIG. 1; and
FIG. 4 is a schematic illustration showing the second embodiment which is adapted for a bistable latching operation.
THE BEST MODE FOR EMBODYING THE PRESENT INVENTION
Hereinbelow, the present invention will be explained in conju
REFERENCES:
patent: 4321570 (1982-03-01), Tsunefuji
Green, R. C. et al., "Pick-Time Detector for Typewriter Magnets," IBM Technical Disclosure Bulletin, vol. 21, No. 3 (Aug. 1978) pp. 1109-1110.
Iio Kenji
Uetsuhara Tokio
Gray David M.
Hix L. T,.
Mitsubishi Mining & Cement Co. Ltd.
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