Abstract: A plunger type electromagnet is provided with an attractive plate connected to the plunger, with an improved configuration of plunger and stationary element, or with a flanged tubular member of magnetic material affixed to the axial end of a coiling bobbin, in order to increase the rate of change in the permeance of the magnetic circuit at the time of attractive operation and to enhance the sensitivity of the electromagnet.Furthermore, the surface area of the abutment faces of the stationary and movable elements is calibrated so as to control the attractive and retaining force thereof.In some embodiments, a permanent magnet is provided which is shaped in the form of an annulus and is magnetized in the direction of thickness of the annulus, so as to facilitate magnetization of the permanent magnet, to reduce the number of component parts, and to provide an electromagnet which is compact in size, light in weight, and suitable for mass production.

Abstract: There are provided a valve which is opened by an improved two-step motion, a valve which operates positively without leakage of fluid even when the difference in pressure between inlet and outlet of the valve is very small, and an improvement of a solenoid valve using those valves.The present invention relates to small-sized opening/closing valve and solenoid valve capable of being operated by very small force and electric power using a dry cell or the like, and is suitable to a solenoid valve for automatic opening/closing control which is used in city gas appliances, etc.

Abstract: 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.

Abstract: The present invention relates to an improvement in an electromagnetic actuator which is composed of a yoke, a stationary core fixed to the yoke, a movable core capable of reciprocally moving with respect to the stationary core, a coil wound around the movable core for applying the first magnetic flux thereto when the coil is energized, and a permanent magnet fixed to the yoke or the movable core so as to apply the second magnetic flux which dividingly flows to the first magnetic flux in parallel thereto. This improved electromagnetic actuator is characterized that it satisfies the condition (a);(a) 0.5>R.sub.1 /R.sub.0 >0wherein,R.sub.1 represents the magnetic reluctance of the magnetic pass of one divided magnetic flux generated by the permanent magnet, including the magnetic reluctance of the gap d.sub.1 between one pole face of the movable core and one pole face of the yoke;R.sub.

Abstract: The present invention provides an improvement for noise suppression, in an electromagnet constructed of the parts including a yoke, a fixed iron core fixed relative to the yoke, a movable iron core capable of being attracted toward and coming apart from the fixed iron core and a coiled wire wound around the magnetic path formed of the yoke, fixed iron core and movable iron core which serves to attract the movable iron core toward the fixed iron core by means of the magnetic flux induced by passing an electric current therethrough, which comprises dividing either one of the fixed iron core and the movable iron core into a body member and an end-surface member, at which the fixed and movable iron cores are contacted with each other, providing an elastic insert member between the body member and the end-surface member of the iron core in such a manner as not to interrupt the path of the magnetic flux and, optionally, providing a spring means which urges a stem supporting the end-surface member in such a manner t

Abstract: An electromagnetic actuator comprising a magnetic circuit consisting of a stationary element and a movable element which actuator applies mechanical force to a valve rod, piston, electro-switch or the like and operates in a monostable manner with high sensitivity and at high speed and has a compact, simple and hardy structure.

Abstract: According to the present invention, an electromagnetic actuator comprises a closed magnetic circuit consisting of a magnetic stationary member in a closed loop shape; an electric coil for energizing the closed magnetic circuit; and a movable member made of a permanent magnet, which member is bridgingly connected between a pair of restricted sections, facing each other, of the closed magnetic circuit through gaps so as to apply magnetomotive force to the closed magnetic circuit.

Abstract: An electromagnetic actuator according to the present invention comprises(a) a casing mainly consisting of a stationary iron core (1) or a combination of a stationary iron core (1) and a yoke, (1b), the casing being formed with at least one of opening;(b) one or a pair of movable iron core (2) as an actuating member, capable of reciprocally moving through the opening of the casing;(c) an electric winding element (4) arranged in the casing for applying a first magnetomotive force to the movable iron core (2) when an electric current is flowed through the winding element (4);(d) a permanent magnet (5) being so arranged in the casing as to apply the second magnetomotive force to the movable iron core; and(e) a bias force generating means (3) for applying a mechanical force or the first magnetomotive force to the movable iron core (2), wherein the improvement is characterized that a permanent magnet (5) is so arranged in the casing as to apply the second magnetomotive force in parallel to the first magnetomotive f

Abstract: An electromagnetic actuator comprises a stationary element made of soft magnetic material which element has a plurality of magnetic poles, a magnet one magnetic pole of which is secured to the stationary element, a movable element made of soft magnetic material which element is faced with the magnetic poles of the stationary element and the other magnetic pole of the magnet through narrow gaps so as to form a magnetic circuit arranged in parallel to the direction of magnetic flux generated by the magnet, and a coil element wound around the stationary element which coil is so arranged as to energize the magnetic circuit in series. When electric current is flowed through the coil, the balance of magnetic force between these magnetic fluxes loses and therefore, the movable element is reciprocally moved with respect to the stationary element. This device can be actuated with a large moving force generated by a fine current.

Abstract: An electronic valve control apparatus for operating a valve device connected to a water supply pipeline for spraying water over the field or land comprising: a solar battery; a secondary battery charged therefrom; an electronic clock; a calendar circuit; a logic circuit which delivers output valve control signals in response to a predetermined schedule; and a valve driving circuit which controls the valve device.