Back to results
US 4,905,121 AGranted
Operation confirming device for electromagnetic actuator
AssigneeMitsubishi Mining & Cement Co., Ltd.
InventorsTokio Uetsuhara, Kenji Iio
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeMitsubishi Mining & Cement Co., Ltd.
InventorsTokio Uetsuhara, Kenji Iio
Estimating the term…
An operation confirming device for electromagnetic actuator according to the present invention is applied to an 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. This 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. This operation confirming device is simply constructed, so that it can be formed in a compact size and a light weight with low manufacturing cost, and the reliability of operation confirming for electromagnetic actuator can be improved.
An electromagnetic actuator consisting essentially of 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,
Dependencies are inferred from the claim text.