An electric actuator includes a casing having a base, on which an electric motor is fixed having a stator with radially extending straight teeth and having a plurality of coils and a rotor formed by a plurality of magnets. The coils extend in a plane parallel to the base of the casing and the rotor is extended by a pinion forming a worm gear with an axis perpendicular to the orientation of the coils. The worm gear meshes with a threaded rod extending parallel to the base of the casing, wherein the threaded rod is guided at the rear by a fixed smooth bearing or by a fixed nut, with the smooth bearing or nut being rigidly connected to a cover of the casing. The axial end of the worm gear is guided by the cover and a printed circuit, to which the plurality of coils is connected, is positioned between the stator and the threaded rod.

An actuator includes an electric motor having a stator and a rotor that can be rotated relative to the stator about an axis of rotation (D). The stator comprises an inner stator part, a first outer stator part and a second outer stator part, wherein the inner stator part, the first outer stator part and the second outer stator part are aligned with one another along the axis of rotation (D) and the inner stator part forms an arrangement of first inner stator poles on a first side axially facing the first outer stator part, and forms an arrangement of second inner stator poles on a second side axially facing the second outer stator part, wherein the first inner stator poles and the second inner stator poles are integrally connected to one another as a single piece.

Homopolar linear synchronous machines are provided herein that include a mover device. The mover device includes a cold plate with ferromagnetic cores extending through slots in the cold plate. Layers of armature coils are located around the ferromagnetic cores on opposite sides of the cold plate. The mover device further includes at least one field coil.

A moving member of a machine can include a cold plate that serves as a primary structural member for the moving member. The cold plate can have one or more cooling channels formed within the cold plate. A plurality of armature windings can be fixed to the cold plate. One or more field windings can be fixed to the cold plate. A plurality of ferromagnetic cores can be fixed to the cold plate, each ferromagnetic core positioned within a loop of at least one of the plurality of armature windings. Other embodiments are described.

Electrical windings for a low-pressure environment are provided. The electrical windings include a body having an aperture and electrical conductors wound about the aperture in the body; a conductive layer at the body, the conductive layer arranged to electrically shield the electrical conductors; electrical connectors at one or more external sides of the body, the electrical connectors electrically connected to the electrical conductors; an insulating housing containing electrical connections between the electrical connectors and the electrical conductors; a conducting faceplate at the insulating housing, grounding portions of the electrical connectors attached to the conducting faceplate; and a conductive coating on the insulating housing, the conductive coating electrically connected to the conducting faceplate and the conductive layer.

A system (100), electromagnetic actuator (102) and track (101) for braking are provided. The actuator (102) includes pole portions (109) extending from back-iron portions. Respective longitudinal axes (104) of the pole portions (109) are arranged about parallel to one another and about perpendicular to a common movement axis (104). A pole pitch of the pole portions (109) is selected to induce eddy currents in a segmented track (101), such that the eddy currents are present in a skin depth at more than one surface of segments (105) of the segmented track (101) when the pole portions (109) are moving at given speeds. Eddy current generated losses occupy about an entirety of a volume of a segment (105) of the track (101) below a given intermediate speed, and the eddy current generated losses occupy at least one third of the volume of the segment (105) at a given maximum speed greater than the given intermediate speed. Individually controllable electrical windings are around respective pole portions (109).

An electromagnetic actuator for generating force is provided. The electromagnetic actuator includes a ferromagnetic body extending along a longitudinal axis, the ferromagnetic body comprising: a back-iron portion; and a pair of pole portions, extending from the back-iron portion, the back-iron portion connecting the pair of pole portions. The electromagnetic actuator further includes one or more magnetic-flux changing components at the pole portions, a respective magnetic-flux changing component located at a respective pole face, the respective magnetic-flux changing component configured to change magnetic flux density at a respective track-facing surface relative to the respective pole face. The electromagnetic actuator further includes electrical windings around the pole portions.

Replaceable windings (101) for an electromagnetic machine (100) are provided. A replaceable winding (101) comprises a body (107) having a longitudinal axis (105), the body (107) comprising opposing surfaces along the longitudinal axis (105). The replaceable winding (101) further comprises an aperture (119) through the body (107), between the opposing surfaces, the aperture (119) having generally parallel internal sides about perpendicular to the opposing surfaces of the body (107), the aperture (119) configured to removably received a pole portion (109) of the electromagnetic machine (100). The replaceable winding (101) further comprises electrical conductors wound about the aperture (119) in the body (107). The replaceable winding (101) further comprises electrical connectors (123) at one or more external sides of the body (107), the electrical connectors (123) connected to the electrical conductors.

A movable magnet is configured by alternately magnetizing an even number of magnetic poles at an outer periphery of a shaft part; a number of core magnetic poles as magnetic poles of a core body and a number of magnetic poles of the movable magnet are equal to each other; the core magnetic poles are disposed to face the movable magnet with an air gap therebetween on an outer peripheral side of the movable magnet in a direction orthogonal to the shaft part; a drive unit is provided with a magnet position holding part provided to face the movable magnet and magnetically attracts the movable magnet to a reference position; the core body is formed to surround an even number of the core magnetic poles; and a coil body is disposed at the core body adjacent to each of the even number of the core magnetic poles.

Disclosed is a stator structure for a galvanometer motor. The stator structure includes a frame and a single electromagnetic coil, wherein a first through hole configured to allow a rotor assembly to run through is molded on the frame, a support portion disposed on a side of the first through hole and extending along an axial direction perpendicular to the first through hole; wherein the electromagnetic coil is wound on the support portion, a protrusive restraining block is molded on both sides of an outer wall of the support portion on the frame, wherein a distance between the support portion and either of the two restraining blocks is a maximum width for winding the electromagnetic coil.