A friction clutch having an electromagnet assembly including a coil and a magnet connected to the coil. When the coil is energised, a magnetic field is generated and passes through the magnet and a magnetisable conductive body adjacent to the magnet, such that a displaceable magnetisable armature portion can be brought from one position into another position. The coil has a plurality of outer portions each having an associated outer dimension of the outer portion. The magnet completely covers an outer portion of the coil by a magnet side. Two further outer portions of the coil are not covered by the magnet or are not covered by more than 20% of an outer dimension of the further outer portion, or wherein, in the case a single further outer portion covered by the magnet, the outer portion is not covered by more than 70%.

An electromagnetic positioning device includes an armature member for actuating a positioning partner and movable in an armature space relative to a stationary core (30). The armature member conducts magnetic flux upon energization of a stationary coil (32). The coil has a coil support with a winding and at least one external contactable connector (46) embedded at least in sections in the core and/or surrounded by the core. The core has an end surface (34), which is planar at least in sections, for interacting with the armature member. The core and the coil are embedded in and/or surrounded by a one-piece pot-like and/or cup-like housing (38) made of a material suitable for deep-drawing in such a manner that the core rests on a membrane-like, continuous and closed base section of the housing, the base section realizing a boundary surface of the armature space.

A solenoid driving a shaft in a direction along a central axis includes a coil that generates magnetic flux and a magnetic container that accommodates the coil. The container has a side surface portion and a bottom portion. A plunger arranged inside the coil and sliding in a direction along the central axis to move the shaft, and a stator core are provided. The stator core has a plunger accommodating portion and a shaft accommodating portion that accommodates the shaft and attracts the plunger. The plunger accommodating portion has a cylindrical core portion that accommodates the plunger inside, and a flange portion that is provided radially outward at an end of the core portion on the bottom portion side and is welded to the bottom portion of the container. A ring core provided on the opposite side of the shaft accommodating portion to the plunger accommodating portion is provided.

An electromagnetic actuating device (8) is for a variable valve drive, in particular electromagnetic switching valve lever systems. The electromagnetic actuating device comprises a base plate (3), a housing which is secured to the base plate (3) and a coil. The housing is designed as a bracket housing (12) and can form part of the magnetic circuit.

A spool arrangement 1 is described comprising a spool member (47) having a coil embedded in a spool housing (48) made of plastic material and protection means (2, 13, 28) comprising at least two parts together forming a receiving volume (46), said spool member (47) being located in said receiving volume. Such a spool arrangement (1) should be used in an environment in which there is a risk of explosions. To this end said parts form protective walls on all sides of said receiving volume (46).

An electromagnetic actuating device includes a pole tube that is substantially cylindrical overall, an armature situated radially inside the pole tube, and an electromagnetic coil situated radially outside the pole tube, the pole tube having a first axial end and a second axial end. The pole tube is configured as a sleeve that is stamped and is brought into its shape by reshaping, the sleeve having, close to its first axial end, openings that extend in the circumferential direction.

A linear actuator (20, 20′, 20″) comprises a plunger receptacle (22); a coil (24); a magnetic plunger (26); a magnetic base (28); a return spring (30); and a lock spring (32, 32′). The coil (24) is wound about at least a portion of an exterior surface of the plunger receptacle (22). The magnetic plunger (26) is at least partially disposed within a cavity at least partially formed by an interior surface of the plunger receptacle (22) for linear motion along a plunger axis (34). The magnetic base (28) is radially disposed relative to the plunger (26). The return spring (30) is disposed to bias the plunger (26) to a plunger extended position. The lock spring (32, 32′) is configured and oriented to lock the plunger (26) in the plunger extended position when power is not applied to the coil (24) but to be attracted to the magnetic base (28) and thereby permit movement of the plunger (26) to a plunger retracted position when the power is applied to the coil (24).

An electromagnetic actuator having a unitary pole piece arranged within and coupled to a housing is provided. The housing is coupled to the unitary pole piece such that a load on the unitary pole piece is reduced during assembly and/or installation of the electromagnetic actuator. The unitary pole piece is structured to reduce leakage past an armature slidably received within the pole piece.

To obtain an electromagnetic actuator capable of improving a thrust force of a movable element. Provided is an electromagnetic actuator, including: a stator, which has a first surface at one end in an axial direction and a second surface at another end in the axial direction, and is made of a soft magnetic material having a tubular space formed in the axial direction; and a movable element, which is disposed in the tubular space, and is configured to move along the axial direction, wherein the stator includes: a coil; a core portion; and a protrusion portion, wherein the movable element includes a movable element core made of a soft magnetic material and a permanent magnet, and wherein at least one of a radially inner side and a radially outer side of the permanent magnet is covered by a movable element core.

Latch protrusions of an upper surface wall are latched into latch recesses of a first front-surface half wall and an upper end portion of a second front-surface half wall of a magnetic cover, and latch protrusions of the upper surface wall are latched into latch recesses of a first rear-surface half wall and an upper end portion of a second rear-surface half wall of the magnetic cover. Hook portions of the first front-surface half wall and a lower end portion of the second front-surface half wall are folded into a coupling groove of the valve body, and hook portions of the first rear-surface half wall and a lower end portion of the second rear-surface half wall are folded into a coupling groove of the valve body.