A magnetic actuator includes a first element and a second element movable with respect to the first element in a movement direction. The first element includes teeth successively in the movement direction, two coils in slots defined by the teeth, and a permanent magnet. The second element includes teeth successively in the movement direction. The teeth of the first and second elements and the permanent magnet are arranged so that the second element is held by magnetic forces in each of three positions also when there are no currents in the coils. The second element can be moved between the three positions by supplying electric currents to the coils. Thus, the second element is held in any of the three positions also when current supply to the magnetic actuator is unintentionally lost.

A magnetic microactuator (100) including a coil (6; 61; 62) controlling the axial movement of a sliding block (30) including at least one permanent magnet (2) joined or aligned with a ferromagnetic or magnetised rear arbor (42) and guiding the field lines of the magnetic field of revolution in the axial direction (D) through the coil (6; 61; 62) wherein circulates the sliding block (30), up to a rear end (43) of said rear arbor (42) that tends to cooperate by magnetic attraction with at least one first ferromagnetic restoration element (8), located in the vicinity of a rear face (25) of the structure (20) of the microactuator (100), in order to bring said sliding block (30) back into a rear end-of-travel position when no coil (6; 61; 62) is powered.

An actuator is proposed. A housing and a housing cap may constitute the exterior of the actuator, and a driving pin may be installed in an inner space of the housing such that the driving pin is moved by being guided by a guide. A cylindrical bobbin having one open end portion may be installed at the driving pin to be moved integrally therewith, and a coil may be installed at the bobbin. A permanent magnet and an iron core may be stacked in the inner space by the guide. A pin iron core may be provided at the driving pin, and a pin coil may be installed in a groove of the pin iron core.

A second electric suspension device includes a second electromagnetic actuator that is provided between the vehicle body and a wheel of a vehicle and generates a driving force for damping vibration of the vehicle. The second electromagnetic actuator includes a columnar rod member and a casing surrounding the rod member and being provided capable of moving forward and backward relative to the rod member in the axial direction. Casing-side armature coils are provided in the casing in the axial direction, whereas magnets are provided in the rod member in the axial direction in such a manner as to face part of the casing-side armature coils in the casing. The magnets are formed by permanent magnets and electromagnets including rod-side armature coils.

A bi-stable solenoid includes a housing, a wire coil arranged within the housing, a first pole piece, a second pole piece, an armature slidably arranged within the housing, and a permanent magnet arranged within the armature between a first armature portion and a second armature portion. The first armature portion and the second armature portion are fabricated from a magnetically permeable material. Selective energization of the wire coil generates a wire coil flux path and is configured to move the armature between the first stable position and the second stable position. The first stable position is established by magnetic flux of the permanent magnet shorting through the first pole piece, and the second stable position is established by the magnetic flux of the permanent magnet traversing the wire coil flux path.

A bistable solenoid valve for a hydraulic brake system, includes a guide sleeve, in which an upper and a lower non-moving pole core are arranged fixedly and a closing element is arranged movably, wherein the closing element penetrates into a valve seat during a closing movement and lifts up from the valve seat during an opening movement. The closing element is connected fixedly to a permanent magnet, wherein the permanent magnet is positioned between the lower and the upper pole core. A coil group is positioned around the guide sleeve and substantially encloses the guide sleeve. The coil group includes at least two coils, wherein the coil group is configured in such a way that an actuation of a movement of the closing element takes place by means of an activation of the at least two coils.

The present invention provides a magnetic movement path control device including: a magnetic force moving unit including a permanent magnet generating a permanent magnetic force, a first pole piece attached to a first surface of the permanent magnet, and a second pole piece attached to a second surface of the permanent magnet; a first outer pole piece in contact with the magnetic force moving unit to form a magnetic path; a second outer pole piece in contact with the magnetic force moving unit to form a magnetic path different from the magnetic path formed by the first outer pole piece; and a magnetic path control member releasing or generating the magnetic path by allowing the magnetic force moving unit to come into contact with the first outer pole piece and be spaced apart from or come in contact with the second outer pole piece, wherein the magnetic force moving unit moves between a first position where at least one of the first pole piece and the second pole piece is in contact with the first outer pole piece and the second pole piece is spaced apart from the second outer pole piece to drop a target object and a second position where at least one of the first pole piece and the second pole piece is in contact with the first outer pole piece and the second pole piece is in contact with the second outer pole piece to lift the target object.

A device for focusing a light beam comprises a optical assembly comprising at least one focusing lens and/or mirror, a support structure which supports the optical assembly, a magnetic actuator configured to move the optical assembly with respect to the support structure along a moving direction substantially parallel to an optical axis (X) of the optical assembly and at least one position sensor configured to provide an indication of the position of the optical assembly with respect to the support structure. The magnetic actuator comprises at least one permanent magnet integrally associated with the optical assembly and at least one first electrical winding integrally associated with the support structure and configured to cause flowing of an electric current within it, wherein the electrical current interacts with said at least one permanent magnet and causes the movement of the optical assembly along said moving direction until the optical assembly is brought to a desired focusing position. The focusing device comprises at least one second electrical winding integrally associated with the support structure and configured to be short-circuited so as to generate, due to the electromagnetic induction generated by the relative motion between said at least one permanent magnet and said at least one second electrical winding, a braking force that opposes the movement of the optical assembly along said moving direction.

A linear actuation assembly includes an electromagnetic coil configured to allow electric current to pass therethrough in either direction creating magnetic flux based on the electric current and its direction. The electromagnetic coil defines a center axis, an inner diameter, and first and second sides. A first set of magnets is disposed in end-to-end relation adjacent the first side of the electromagnetic coil at the inner diameter thereof. A second set of magnets is disposed in end-to-end relation adjacent the second side of the electromagnetic coil about the inner diameter thereof. The linear actuation assembly further includes at least one translator disposed adjacent the first and second sets of magnets opposite the electromagnetic coil. The at least one translator is latchable between a first position adjacent the first set of magnets and a second position adjacent the second set of magnets in response to the magnetic flux and the direction in which the electric current is flowing.

A servo valve has a movable element disposed inside a body, and a drive unit to slide the movable element in the axial direction. A first elastic portion on one end portion side of the body has a first elastic force to press the movable element toward the drive unit connected to another end portion of the body; a second elastic portion on another end portion side of the body has a second elastic force to press the movable element toward the one end portion side of the body. A connecting portion is connected to the second elastic portion, wherein at a neutral position of the movable element, the connecting portion abuts against an inner peripheral surface of the body and against the movable element. An end of one of the first and second elastic portions is fixed directly to the movable element, and an end of the other of the first and second elastic portions is connected to the connecting portion.