Abstract: A system for generating a linear movement including an electromagnetically charged body which is free to move along a main direction, a static field generator, and two buffer elements. The movement of the electromagnetically charged body along the main direction is controlled by the static field generator and by the buffer elements. The static field generator is alternately powered with a power profile such as to generate the displacement of the system in one of the two ways along said main direction.

Abstract: A monitoring apparatus for monitoring a multiphase flow in a pipe using magnetic induction tomography, the apparatus comprising a tubular member adapted for fitting around a pipe defining a flow conduit, wherein the tubular member has outer and inner tubular surfaces surrounding a central longitudinal axis of the tubular member, the inner tubular surface defining a central bore extending along the central longitudinal axis for receiving a pipe therealong, wherein the outer tubular surface has a polygonal cross-section and is comprised of an annular array of a plurality of planar faces, each planar face extending parallel to the central longitudinal axis, wherein at least two of the planar faces each includes a respective coil mounting portion on which is mounted a respective electrical coil, wherein the coil mounting portion comprises a recess in the tubular outer surface which receives a respective electrical coil.

Abstract: The invention relates to a linear motor structure for a sliding door, comprising a rotor assembly, wherein the rotor assembly includes a fixed part and a movable part, the fixed part is provided with a permanent magnet, a slot hole is formed in a bottom part of the permanent magnet, the movable part is provided with a telescopic rod that is slidably inserted into the slot hole from one end of the slot hole, and a motion transmission part capable of transmitting a motion of the rotor assembly, and the movable part and the fixed part are fixed by a fastener. The linear motor structure is novel in design, reasonable in structure and favorable in adaptability due to the capability of flexibly adjustment of the rotor assembly according to a width of a door frame.

Abstract: A coil support for an electric motor includes a coil holding arrangement having coil holding portions configured to hold a corresponding number of coils. A connectics receiving arrangement is configured as a housing for interconnected cables and coil wires. The connectics receiving arrangement comprises a cable receiving portion having recesses configured to receive the cables and a wire receiving portion having through-holes extending from a top surface to a bottom surface of the wire receiving portion. The top surface of the wire receiving portion is arranged adjacent the coil holding arrangement and the bottom surface of the wire receiving portion is located in the connectics receiving arrangement so as to provide for electrical interconnection of the coils with corresponding ones of the cables. A separation wall is arranged between the bottom surface of the wire receiving portion and the coil holding arrangement.

Abstract: A vibration actuator that cooperates with a coil and a magnet to vibrate a movable body with respect to a stationary body, including: the stationary body including the coil and a core around which the coil is wound; a shaft part; and the movable body including the magnet, the movable body being movably supported by the stationary body via the shaft part, wherein the core is disposed along an axial direction of the shaft part, and includes a core-side magnetic pole to be excited by energization to the coil, the magnet includes a magnet-side magnetic pole disposed so as to face the core-side magnetic pole with a gap therebetween, and the vibration actuator further includes a spring part elastically supporting the movable body with respect to the stationary body, linearly movably in the axial direction in a reciprocating manner, and rotationally movably about an axis in a reciprocating manner.

Abstract: The disclosure relates to a stator module for a linear drive of a container-handling machine in the beverage processing industry, comprising a housing in which a core and at least one coil are arranged, wherein the stator module comprises a media supply for supplying a gas into the interior of the housing and the media supply is adapted to pressurize the interior of the housing, as well as a corresponding container-handling machine and a method of operating a container-handling machine.

Abstract: SMA actuators and related methods are described. One embodiment of an actuator includes a base; a plurality of buckle arms; and at least a first shape memory alloy wire coupled with a pair of buckle arms of the plurality of buckle arms. Another embodiment of an actuator includes a base and at least one bimorph actuator including a shape memory alloy material. The bimorph actuator attached to the base.

Abstract: A vibration-powered generator (100) has a vibrating element (10) and a coil (40) arranged therearound, and is configured to obtain electromotive force by moving the vibrating element (10) relatively to the coil (40). The vibrating element (10) has a plurality of magnets (20a to 20d) arranged so as to oppose the pole-faces of the same polarity; end supporting portions (12, 13) which support the plurality of magnets from both ends in the direction of arrangement; and a cushioning (16). The cushioning (16) is held between the end supporting portion (12) and the magnet (20c), while being compressed under a stress exceeding the repelling force between the pole-faces of the magnets, so as to keep the magnets (20a to 20d) in a row without leaving a gap in between, overcoming the repelling force.

Abstract: Provided herein is a linear motor in which a back yoke can readily be mounted onto a linear motor body. The linear motor body is surrounded or wrapped by the back yoke that works to form part of a magnetic circuit of the linear motor body. The back yoke assembly includes first and second divided assemblies. The first and second divided assemblies have the same dimension and shape, and are each formed by press working a silicon steel plate or a magnetic plate made of SPCC material.

Abstract: The linear motor includes: a frame; a slider having an mounting portion to allow the suction nozzle to be coupled thereto, wherein the slider is support by the frame in a movable manner in an up and down direction; a plurality of permanent magnets fixed to the slider while being aligned in the up and down direction; a spring member installed between the frame and a region of the slider spaced from the fixation position of the permanent magnets in the up and down direction, to bias the slider upwardly; a coil supported by the frame in such a manner as to be opposed to the permanent magnets; and an encoder supported by the frame in side-by-side relation with the coil in the up and down direction and adapted to detect a movement of the slider. The encoder and the spring member are arranged side-by-side in a horizontal direction.

Abstract: A linear motor for optical systems, for example, endoscopes, is described. The motor has a stator with a magnetic guiding member and a coil. The armature of the motor includes two permanent magnets which are of opposite polarity. A pole piece made of soft-magnetic material is provided between the permanent magnets. By applying current to the coil, the armature can be displaced from a rest position in the longitudinal direction.

Abstract: A multi-shaft linear motor formed by a plurality of single-shaft linear motors is disclosed. Each of the single-shaft linear motors is provided with a magnetic body and an armature. Each of the single-shaft linear motors includes a base plate. The base plate has a base surface defining the moving direction, wherein the stator is fixed onto the base surface along the moving direction, and the mover is attached onto the base surface in a movable manner reciprocating along the moving direction and in opposed relation to the stator. The single-shaft linear motors are stacked in a stacking direction perpendicular to the base surface in such a way that the single-shaft linear motors are individually detachable as a unit, the base plate thereof contains the stator and the mover.

Abstract: A sealed linear motor system is provided. The sealed linear motor system includes a sealed coil assembly having a plurality of coil windings within a base plate and comprising covers disposed about the base plate and coil windings to prevent moisture and/or chemical ingress into the base plate and the coil windings. The sealed linear motor system also includes a sealed magnet assembly disposed adjacent to the coil assembly and comprising a plurality of magnets mounted on a magnet mounting plate and a magnet housing disposed on a surface of the magnet mounting plate to cover and seal the plurality of magnets within the housing.

Abstract: A linear actuator, comprising a base housing, a top housing, and a piston assembly. The base housing may comprise at least one recess configured to restrain at least one magnet in three dimensions and a channel configured to receive a linear guide. The top housing may be fixedly attached to the base housing and may comprise at least one recess configured to restrain another at least one magnet in three dimensions. The piston assembly may comprise at least one coil bobbin, a shaft, a linear encoder scale, and a flex cable, wherein the piston assembly may be positioned between the base housing and the top housing.

Abstract: A linear actuator, comprising a base housing, a top housing, and a piston assembly. The base housing may comprise at least one recess configured to restrain at least one magnet in three dimensions and a channel configured to receive a linear guide. The top housing may be fixedly attached to the base housing and may comprise at least one recess configured to restrain another at least one magnet in three dimensions. The piston assembly may comprise at least one coil bobbin, a shaft, a linear encoder scale, and a flex cable, wherein the piston assembly may be positioned between the base housing and the top housing.

Abstract: A linear actuator includes a coil portion and a shaft portion. The coil portion includes a plurality of coils respectively applied with AC currents having different phases from one another. The shaft portion passes through an inside of the plurality of coils. The shaft portion includes: a plurality of permanent magnets and a plurality of intermediate members. The plurality of permanent magnets is arranged along a central axis C such that opposite magnetization directions face to each other in a direction of the central axis C. Each of the plurality of intermediate members is arranged between adjacent two of the plurality of permanent magnets. A saturation magnetic flux density of each of the plurality of intermediate members is higher than a saturation magnetic flux density of each of the plurality of permanent magnets.

Abstract: A linear motor for optical systems, for example, endoscopes, is described. The motor has a stator with a magnetic guiding member and two adjacently disposed coils which are energized in opposite directions. Furthermore permanent magnets polarized in opposite directions and in the axial direction are provided on both sides of the pair of coils. The armature of the motor has a permanent magnet which is polarized in the opposite direction to the permanent magnet of the stator and is connected to a pole piece at each end. The pole pieces are arranged so that in the rest position each pole piece lies at the centre of one of the coils. By applying current to the coil, the armature can be displaced from a rest position in the longitudinal direction.

Abstract: This stage apparatus includes a movable table to hold a sample, a levitation unit to operate the movable table at least in a vertical direction, and a linear motor to operate the movable table in a first horizontal direction in a horizontal plane, including a linear motor movable element arranged inside the movable table and a linear motor stator arranged inside the movable table.

Abstract: Electric motors configured for deployment in a downhole well environment are provided. Downhole well pumping systems including an electric motor are also provided. In one example, an electric motor includes a series of at least three magnets, one of the inner and outer two magnets being movable. A supply of alternating current is configured to alternate the polarity of one of the inner and outer two magnets to thereby cause one of the inner and outer two magnets that is movable to reciprocate and provide linear output to drive an operable production device. In another example, two adjacent, stationary magnets and at least one movable magnet are adjacent to one another. A supply of alternating current is coupled to the magnets so as to alternate the polarity of one of the movable and stationary magnets and to thereby to cause reciprocating linear output to drive the operable production device.

Abstract: An actuator is configured to produce a displacement force between a first and a second part to displace the first and second parts relative to each other. The Actuator includes a first magnet subassembly, attached to one of a first and a second part, and an electrically conductive element, attached to the other one of the first and second part and placed near the first magnet subassembly. The first magnet subassembly includes at least one set of at least two adjacently placed magnets oriented such that their magnetic polarizations are substantially mutually opposite, and a back mass made out of a magnetic flux guiding material and connecting the magnets to guide a magnetic flux there between. The first magnet subassembly includes a carrier made of a non-magnetic-flux-guiding material, the carrier including at least one recess in which the at least one set of back mass and magnets is embedded.

Abstract: A voice coil motor housing includes a top wall having an opening and four sidewalls extending from the top wall. The four sidewalls and the top wall cooperatively form a rectangular chamber opened at one end. Each of the sidewalls includes a top portion and a bottom portion. The top portions of the four sidewalls are connected to one another and forming a substantially gapless seam between each two adjacent sidewalls at the top portions. At least one slot is defined in the bottom portions of the sidewalls, the at least one slot is perpendicular to the top wall, and the slot is arranged adjacent to the corresponding gapless seam. At least one snap is arranged on the sidewalls at the corresponding bottom portion thereof, and the at least one snap protrudes inwardly of the chamber.

Abstract: There is provided a linear actuator provided with a dust-proof mechanism capable of preventing dust-proof belts from being deformed, improving a sealing performance between the dust-proof belts and a housing member, and achieving high dust-proof performance irrespective of a size of the linear actuator.

Abstract: A linear vibrator includes a casing defining an internal space of the vibrator, a bracket disposed under the casing and having a coil, to which electricity is applied to induce a magnetic field, an oscillator having a magnet received in a hollow portion of a yoke, one end of which is closed, and a cylindrical weight coupled onto the circumference of the yoke, and a spring member coupled with an upper portion of the casing to elastically support the oscillator such that the oscillator is movable in a linear motion, wherein the weight is provided with a plurality of circumferential recesses in which a rotary member is rotatably inserted while being in contact with a sidewall of the casing.

Abstract: The invention relates to a linear drive for a machine tool having a housing, having a carriage, which is mounted so it is axially movable in the housing via two bearings, and has a central axis and a length, and having at least one first motor, having a first motor element and a second motor element, wherein said first motor element is disposed on said carriage and said second motor element is disposed on said housing, wherein said first motor element is implemented on said carriage as a primary part and said second motor element is implemented on said housing as a secondary part. Furthermore, the invention relates to a method for moving a carriage for a lathe tool of a highly-dynamic machine tool employing a crossed roller bearing for mounting the carriage, wherein all roller bodies of said crossed roller bearing are always operationally linked to a carriage-side bearing surface, and said carriage is driven at an oscillation frequency of at least 50 Hz, in particular between 60 Hz and 200 Hz.

Abstract: Provided is a linear motor capable of simplifying assembling of a coil unit and stabilizing a coil pitch and the overall length of the coil unit. The linear motor has a rod 1 having magnets 3, a plurality of coils 4 arranged in the axial direction of the rod 1, a housing 2 covering the coils 4, and a coil holder 5 holding the coils 4 in the housing 2. The coil holder 5 includes a holder main body 5a elongating in the coil arrangement direction and a plurality of spacer portions 5b made of resin and each interposed between each adjacent two of the coils 4 to insulate the coils 4 from each other, the spacer portions 5b being formed integrally with the holder main body 5a.

Abstract: The invention relates to a linear motor equipped with a field element and an armature and adapted to produce a force causing the field element and the armature to be relatively displaced along a given axial direction by interaction of magnetic fluxes generated between the field element and the armature during an operation of supplying electric power to the armature.

Abstract: The present invention relates to a linear motor provided with a magnetic body and an armature and adapted to produce a force causing the magnetic body and the armature to be relatively displaced in a given moving direction by interaction of magnetic fluxes generated between the magnetic body and the armature during an operation of supplying electric power to the armature.

Abstract: A camera shutter device and an optical apparatus having the same are disclosed. The camera shutter device includes a pair of cores, each wrapped by a coil and having a distal end facing the other, wherein each coil is formed at the distal end with an electromagnetic force line generating unit. A magnet comprising a first magnet and a second magnet is interposed between the pair of cores. The magnet linearly and reciprocally moves in a direction perpendicular to the electromagnetic force line generating unit, and a slider opens and shuts a shutter blade as the magnet linearly and reciprocally moves, whereby miniaturization and thinning of the shutter device can be realized, and an opening/shutting operation can be stably performed.

Abstract: The present invention relates to a linear motor provided with a magnetic body and an armature. The liner motor is adapted to produce a force causing the magnet body and the armature to be relatively displaced along a given linear moving direction by interaction of magnetic fluxes generated between the magnetic body and the armature during an operation of supplying electric power to the armature. In a typical aspect, the linear motor of the present invention comprises a movable section attached to a base plate adapted to set the moving direction on a base surface thereof, in such a movable manner as to relatively reciprocate along the moving direction with respect to the base plate. A mover is provided on the movable section and formed as one of the magnetic body and the armature.

Abstract: A voice coil motor housing includes a top wall having an opening and four sidewalls extending from the top wall. The four sidewalls and the top wall cooperatively form a rectangular chamber opened at one end. Each of the sidewalls includes a top portion and a bottom portion. The top portions of the four sidewalls are connected to one another and forming a substantially gapless seam between each two adjacent sidewalls at the top portions. At least one slot is defined in the bottom portions of the sidewalls, the at least one slot is perpendicular to the top wall, and the slot is arranged adjacent to the corresponding gapless seam. At least one snap is arranged on the sidewalls at the corresponding bottom portion thereof, and the at least one snap protrudes inwardly of the chamber.

Abstract: A voice coil motor assembly includes a housing, a voice coil motor, a cover, and a transparent board. The voice coil motor is received in the housing. The cover is secured to the voice coil motor and resists the top surface of the housing. The cover includes a top surface defining an aperture. A limiting element protrudes from the top surface of the cover. The transparent board is adhered to the top surface of the cover and covers the aperture. The movement of the transparent board is limited by the limiting element.

Abstract: A stator for a linear motor is described. The stator has a stator member with a coil arrangement, a connecting member with external terminals, a sensor arrangement having at least one Hall sensor, and terminals for the sensor arrangement, as well as a holding member. The holding member is subdivided into a connecting member insertion portion and a stator member insertion portion and has holding devices for disposing the stator member and the connecting member stationarily, releasably and in an accurate position with regard to each other.

Abstract: A voice coil motor includes a stationary frame defining a first receiving space, a cover, and a base defining a second receiving space. The stationary frame includes a top surface and an opposite bottom surface. The top surface defines at least two first recesses. A first blocking portion is formed between each first recess and the first receiving space. At least two first protruding portions extend from the bottom surface. The cover is mounted to the top surface and includes a first surface facing the top surface. At least two second protruding portions extend from the first surface corresponding to the first recesses. The base supports the bottom surface and includes a second surface facing the bottom surface. The second surface defines at least two second recesses corresponding to the first protruding portions. A second blocking portion is formed between each second recess and the second receiving space.

Abstract: An actuator is configured to produce a displacement force between a first and a second part to displace the first and second parts relative to each other. The Actuator includes a first magnet subassembly, attached to one of a first and a second part, and an electrically conductive element, attached to the other one of the first and second part and placed near the first magnet subassembly. The first magnet subassembly includes at least one set of at least two adjacently placed magnets oriented such that their magnetic polarizations are substantially mutually opposite, and a back mass made out of a magnetic flux guiding material and connecting the magnets to guide a magnetic flux there between. The first magnet subassembly includes a carrier made of a non-magnetic-flux-guiding material, the carrier including at least one recess in which the at least one set of back mass and magnets is embedded.

Abstract: A reciprocating linear actuator in which a slide and a counter slide are arranged for linear movement within a hollow guide. The actuator has driving force generating means for generating a driving force between the slide and the counter slide and also has bearing structures formed individually between the guide and the slide and between the guide and the counter slide. If an external force acts on the slide, the external force is transmitted from the slide to the guide through the bearing structure between them.

Abstract: A movable magnet type linear motor with an improved end cover assembly includes a mover having a housing and an accommodating space extending along an axis of the housing for receiving therein a coil, wherein the housing having each of two opposite ends formed with a retaining groove in a direction perpendicular to the axis of the housing for receiving an end cover that is centrally formed with a hole so as to receive a stationary inner stator, and wherein an engaging mechanism is provided between the end cover and the retaining groove so that the end cover is allowed to be assembled to the housing in the direction perpendicular to the axis of the housing and coupled with the housing.

Abstract: A cylindrical linear motor capable of solving the problem that a leak flux links an aluminum frame at both ends of an armature of a conventional cylindrical linear motor, which causes a viscous braking force as a motor brake force, is provided. The cylindrical linear motor armature 20 includes a plurality of cylindrical coils 20a arranged in the axial direction in a cylindrical yoke 20b formed by a magnetic material and frames 20d and 20e covering the outside of the cylindrical yoke 20b. Only in the axial direction region of the frame 20d where the cylindrical yoke 20b exists, the frame 20d is formed by an aluminum frame 20d, and the axial direction both end portions are formed by a resin cap 20e.

Abstract: Electrical machines having pole teeth which can be equipped with a permanent magnet are intended to be capable of being assembled more easily. Provision is made for this purpose for two pole tooth halves (1,2) to be provided for each pole tooth, each of which two pole tooth halves has two opposing end sides. At least one end-side plate (3), which connects in each case one end side of the two pole tooth halves (1,2) to one another, is used for forming a pocket (5) between the two pole tooth halves (1,2), into which pocket a permanent magnet can be inserted. A space for the permanent magnet can therefore be kept free during assembly of the pole tooth or during winding thereof. Since the permanent magnet only needs to be inserted into the pocket (5) relatively late, the entire assembly process can be simplified.

Abstract: A linear vibration motor according to an aspect of the invention may include: a case having a cavity to receive a mass therein; a movable part generating a magnetic field inside the case and moving in a transverse direction while being secured to the mass; a coil part generating a force, by which the mass performs a linear reciprocating motion, by interaction with the magnetic field generated from the movable part upon receiving power; and a support plate dividing the cavity in which the coil part is mounted to face the movable part.

Abstract: A dust cover plate for a linear motor is provided. The linear motor has a machine base mounted with a guideway set that carries a sliding block to slide therealong, a stator being settled at one side of the machine base, and a mover including a mover base connected to the sliding block and a block mover core facing the stator. Therein, an accommodating space exists between the mover base and the mover core for receiving the dust cover plate. The dust cover plate has one side fixed to the guideway and extending over the stator and the mover core to prevent external dust or particles from falling between the mover and the stator.

Abstract: A magnet yoke of a linear motor includes a plurality of recesses set in equidistance in a side surface of the magnet yoke and defining a plurality of peaks and valleys arranged alternately and a plurality of permanent magnets aligned abreast in equidistance in an opposite side surface of the magnet yoke so that an interval is defined between two adjacent permanent magnets and has a center aligned with a center of a corresponding peak and valley. Two adjacent permanent magnets form a magnet unit for generating a magnetic flux distribution. An empty section formed in each of the valleys is twice as wide as an interval between two adjacent permanent magnets, and is located in a middle of the two permanent magnets so as to make a moderate magnetic flux distribution.

Abstract: An electrical linear drive device comprises an outer housing consisting of a housing tube and two housing covers disposed at the ends thereof The outer housing defines in the interior thereof a receiving space, into which the drive part of a drive unit in the form of an electrodynamic linear direct drive like a cartridge is placed, and an output drive rod extends outward through the front housing cover. From a drive coil arrangement of the drive unit an electrical operation cable extends to an central electrical interface means. The electrical interface means is disposed laterally on the housing tube and the operation cable and the signal cable extend in a cable channel formed in the wall of the housing tube.

Abstract: A primary component for a linear motor includes at least one laminated core. A winding for creating a first magnetic field is arranged in the grooves of the laminated core. Permanent magnets create a second magnetic field and are arranged on the teeth of the laminated core. The primary component is provided for arrangement with a secondary component, and the primary component and the secondary component are spaced from each other by an air gap. The primary component includes a flat cover, arranged on the side of the primary component facing the air gap.

Abstract: The invention relates to a linear drive having a stationary active unit (1), a stationary return flow element (11), a movably mounted passive unit in the form of a thin tooth rack (10) and a bearing unit (15), which allows the relative movement between the active unit and the passive unit. A lateral guidance plate (30) is attached to the tooth rack (10), extends at an angle with respect to the plane of the tooth rack (10) into a guide gap (31) and is guided there, the guide map (31) running in the return flow element (11) or in the active unit (1).

Abstract: An X-Y table actuator is constituted by stacking a stationary plate, an intermediate plate, and a movable plate. Between the stationary plate and the intermediate plate, arranged is an X-direction drive means for driving the intermediate plate in an X-direction with respect to the stationary plate. Between the intermediate plate and the movable plate, on the other hand, there is provided a Y-direction drive means for moving the movable plate forward and backward in a Y-direction with respect to the intermediate plate. By stacking the stationary plate and the movable plate, which are formed into a substantially channel-shape, and the intermediate plate, which is formed into a substantially flat-shape on each other, a housing chamber for the X-direction drive means is formed between the stationary plate and the intermediate plate, and a housing chamber for the Y-direction drive means is formed between the intermediate plate and the movable plate.

Abstract: A shell for housing a voice coil motor (VCM) includes a casing and a cover. The casing defines a rectangular opening and two opening respectively in two opposite edges of the rectangular opening. The casing extends a pair of stripping strips into each opening and towards each other. The cover correspondingly defines two grooves. The cover covers the rectangular opening and each pair of gripping strip is bent into a corresponding groove to grip the cover.

Abstract: The cylindrical linear motor includes: a stator 1 that has a plurality of coils 5 coiled in a cylindrical shape and arranged in an axial direction on an inner side of a metal pipe 4; a mover 2 disposed to face an inner side of the stator 1 with a magnetic gap therebetween and having a plurality of permanent magnets 6 inserted in the axial direction into a cylindrical can 9; shafts 8 inserted into the mover 2; shaft support members 7 for supporting the shafts 8 at both axial ends of the metal pipe 4; and shaft receiving member 10 each disposed at both ends of an inner side of the can 9 to be adjacent to the permanent magnets 6 and having a concave portion 10a for fitting to a cone of the shaft 8.

Abstract: A protected magnetic displacement device comprises a mover, a stator, a first protecting sheet and a second protecting sheet. The mover is provided with a magnetically sensitive portion, and the stator is provided with two loading portions each having plural magnets. The two loading portions are oppositely located to form a space therebetween for insertion of the magnetically sensitive portion of the mover. The first protecting sheet is located on one of the loading portions, and the second protecting sheet is located on the other of the loading portions. The magnetically sensitive portion of the mover is isolated inside the space of the stator by the first protecting sheet and the second shied cover, so that the surrounding metal objects can be prevented from being attracted into the stator since the leakage of the electromagnetic interference is avoided, thus making the mover move along the stator stably.

Abstract: A vertical actuator has a stationary part that includes an upper part made of magnetic material which is magnetically separated from a yoke which bears a coil. The upper magnetic part generates an overall reluctance force on the movable part of the actuator which, over the entire functional range of the actuator, is slightly greater than the gravitational force. When the coil is not energized, the movable part has a position of stable equilibrium which is in the upper section of this functional range.

Abstract: The invention relates to a cover (20) for a secondary part (2) of an electrical linear motor (1), wherein the secondary part (2) includes at least one first and one second secondary partial element (12), and wherein each secondary partial element (12) comprises a toothed profile, and wherein the cover (20) extends over the toothed profiles of the first and second secondary partial elements (12), forming a continuous surface. The invention further relates to a secondary part (2) comprising a cover (20) and a linear motor (1) comprising a secondary part (2) and a cover (20).