Abstract: A wave winding for a stator of an electric machine is configured to be placed in a series of stator grooves located along a periphery of the machine to increase power and efficiency of the machine by avoiding losses, particularly during upper rotational speed range operation. The wave winding has at least two conductors for one respective phase of the machine. The conductors are interconnected in parallel and/or series and can be disposed at a given winding pitch in a number of at least two successive stator grooves of each magnetic pole and each phase of the machine in a sequence predefined for each phase and for one respective magnetic pole along the periphery of the machine. The predefined sequence at least of the conductors interconnected in parallel is transposed by at least one groove skip in at least one position along the periphery of the machine.

Abstract: A motor comprises an enclosure, a stator and a rotor, the stator comprising a first electromagnetic group and a second electromagnetic group between which the rotor is inserted, the rotor comprising a rotating shaft and a magnetic part installed around the outer wall of the rotating shaft, the motor further comprising an elastic element with a first contact part fixed on rear cover of the enclosure and a second contact part connected with the rotating shaft, wherein the elastic element is elastically deformable in at least two different directions. The motor is applicable to electric toothbrushes, shavers, loudspeakers, electric hammers, stirrers, refrigerators, sewing machines, packaging and bundling machines, electromagnetic pumps, etc. A rotating shaft of the electric toothbrush using the motor has the effects of high-frequency shimming and high-frequency knocking vibration, and the dental calculi on the dental surface are crushed via high-frequency knock, with higher cleaning effect.

Abstract: An actuator system comprising a shared link (121) arranged to pivot about a first axis (131) relative to a reference structure, a controlled element (125) arranged to pivot about a second axis (126) relative to the reference structure, a first member (146, 152) arranged to pivot about a third axis (134) relative to the shard link and a fourth axis (136) relative to the controlled member, a first actuator arranged to control a first variable distance (LI) between the third axis and fourth axis, a second member (147, 153) arranged to pivot about a fifth axis (133) relative to the shared link and a sixth axis (135) relative to the controlled element, a second actuator (141) arranged to control a second variable distance between the fifth axis and the sixth axis, the system configured such that a change in the first variable distance causes rotation of the controlled element about the second axis when the second variable distance is constant and vice versa.

Abstract: A linear actuator may include a movable element including a cylindrical permanent magnet; a stationary element including a coil bobbin that surrounds the permanent magnet at an outside in a radial direction; a spring member connected to the movable element and the coil bobbin, and supporting the movable element to be movable in an axial direction in relation to the coil bobbin; a coil wound around the coil bobbin, for configuring a magnetic drive mechanism together with the permanent magnet, the magnetic drive mechanism being structured to drive the movable element in the axial direction; and a gel damper member being sandwiched between the stationary element and the movable element in the axial direction.

Abstract: A plunger lift system that uses a linear induction motor instead of gas or fluid pressure to lift the plunger. Electrical voltage is applied to electromagnets installed along the tubing of a wellbore that will induce magnets contained within a special plunger that is introduced inside the tubing to move it and allow it to lift liquids with a piston-like action. The electromotive force may be adjusted by varying the applied voltage as needed to lift the column of liquid from the wellbore or the current reversed to accelerate and optimize plunger descent.

Abstract: In some embodiments, an image sensor mechanically coupled to a base of a camera module. A coil assembly is mechanically coupled to the base of the camera module. The coil assembly includes terminals for connections to respective ones of coils through leads routed through thin areas leading to coil housings. The coils include optical image stabilization coils mounted perpendicular to the image sensor on each of a plurality of faces of the camera actuator module.

Abstract: A vibration sensor having at least one magnet and at least one coil, a first leg having a first and second mounting positions, and a second leg having first and second mounting positions, wherein a coil unit having a coil is arranged at the first mounting position of the first leg, and wherein a permanent magnet holder with a magnet is arranged at the first mounting position of the second leg, and the coil unit surrounds the magnet unit so that the magnet unit can move relative to the coil unit and be surrounded by the coil unit, and wherein the first leg, in the second mounting position, is arranged with a spacing relative to the second mounting position of the second leg, so that the first leg at the first mounting position is arranged spring-like with respect to the second leg at the first mounting position.

Abstract: Disclosed herein is a three-phase inverter system for a motor, which supplies three-phase power to a motor. The three-phase inverter system includes first, second, and third output units, and first, second, and third capacitors configured to supply power to the respective first, second, and third output units. The first output unit, the first capacitor, the second output unit, the second capacitor, the third output unit, and the third capacitor are radially arranged to form a hexagonal shape.

Abstract: Magnetic drive device characterized in that it comprises a driving element moving in a guide element, and suitable to drive a driven element; the driven element is mobile along the guide element, in accordance with the movement of the driving element; the driving element acting on the driven element by use of magnetic means and without direct physical contact. The magnetic drive action of the driving element is induced by means of the use of permanent magnets or of electromagnets which act on the driven element.

Abstract: A MEMS sensor device includes an electrically conductive membrane and an electrically conductive closed loop structure. The closed loop structure is arranged in proximity to the membrane and is configured to reduce eddy currents in the membrane.

Abstract: A transporting apparatus comprises a track (2) and at least one movable element (3) movable along said track (2), said movable element (3) comprising a supporting body (14), said track (2) comprising a first guiding surface (11a) and a further first guiding surface (lib) facing towards said supporting body (14), a second guiding surface (12a) and a further second guiding surface (12b) facing away from said supporting body (14), and a third guiding surface (13a) arranged transversally to said first guiding surface (11a) and said second guiding surface (12a) and a further third guiding surface (13b) arranged transversally to said further first guiding surface (lib) and said further second guiding surface (12b), wherein said movable element (3) comprises a first couple of rollers (15) slidably coupled to said first guiding surface (11a), a further first couple of rollers (16) slidably coupled to said further first guiding surface (lib), a second couple of rollers (17) slidably coupled to said second guiding surf

Abstract: A linear vibration motor includes a base with an accommodation space, a vibration unit and two elastic parts fixed respectively on the opposite ends of the vibration unit. The elastic parts include a main elastic part and an auxiliary elastic part. The auxiliary elastic part includes a first auxiliary elastic part and a second auxiliary elastic part which are fixed respectively on the opposite sides of the vibration unit and the base which are parallel to the vibration direction of the vibration unit. Compared with the related technology, the liner vibration motor of the present disclosure has a good performance and a high reliability.

Abstract: A stage device is equipped with a surface plate and a wafer stage which is mounted on the surface plate and has an exhausting port formed on a surface facing the surface plate. In a state where the wafer stage lands on the surface plate, an air chamber is formed in between the surface plate and the wafer stage. Pressurized gas blows out from the exhausting port provided at a stage main section into the air chamber, and self-weight of the wafer stage is cancelled by an inner pressure of the air chamber. This allows to the wafer stage which has stopped on the surface plate to be moved manually.

Abstract: A motor structure for varying a counter electromotive force is provided. The motor structure includes a rotor that is fixed annularly and concentrically to a radially outside from an exterior circumferential surface of a shaft of an electric motor and has a permanent magnet, and a stator that has coils positioned on the interior side of a motor housing and on the concentrically exterior side with the permanent magnet of the rotor. Further, the coils are positioned spaced apart from each other at predetermined intervals. A drive unit moves the stator in the axial direction of the shaft to vary the interlinkage flux, by varying an area that the magnetic flux of the permanent magnet of the rotor passes through the coils of the stator.

Abstract: A linear-motor stator assembly comprising a stator and an integral line reactor in one housing. The reactor has inductor coils which are connected in series with the stator windings to compensate for unequal inductances in the stator phases and balance the polyphase currents into the stator.

Abstract: The periodic magnetic field generator includes a flat-shaped first yoke, and a plurality of main permanent magnets, an auxiliary permanent magnet, and a side permanent magnet on the first yoke. The plurality of main permanent magnets are magnetized in a first direction of generating magnetic fields, the direction being perpendicular to the first yoke, and disposed such that orientations of the magnetization become opposite alternately in the first direction. The auxiliary permanent magnet is magnetized in a second direction perpendicular to side faces of the plurality of main permanent magnets, and placed between the side faces of the main permanent magnets. The side permanent magnet is magnetized in a third direction perpendicular to the first direction, and disposed so as to cover end faces of the main permanent magnets and the auxiliary permanent magnet, the end faces being perpendicular to the side faces of the main permanent magnets.

Abstract: In one aspect of the present invention, a stator of a linear compressor comprises first stator pieces that are circumferentially and sequentially arranged about an axial direction and are radially disposed, second stator pieces that are provided between outer parts of the adjacent first stator pieces, and an outer side, away from a motor axis, of the second stator pieces assembled at an outer circumference of the stator. The stator can reduce the magnetic losses of the stator caused by the gap, and improve the efficiency of the motor. It can also improve the performance, stability, durability and reliability of the linear compressor. It can also reduce the bulk of the linear compressor.

Abstract: A driving apparatus for a direct-drive type washing machine includes a support member that is fixed to the lower side of a washing tub; a dehydrating tub rotating shaft that is rotatably supported on the support member and that is connected to a dehydrating tub to rotate the dehydrating tub; a pulsator rotating shaft that is rotatably arranged in the inside of the dehydrating tub rotating shaft and that is connected to a pulsator to rotate the pulsator; a drive motor comprising a double rotor including an outer rotor that is connected to the pulsator rotating shaft and an inner rotor that is connected to the dehydrating tub rotating shaft, and a double stator including a first stator coil for rotating the outer rotor and a second stator coil for rotating the inner rotor; and a motor drive unit that generates alternating-current (AC) power according to a washing control signal.

Abstract: A linear motor includes a rotor rotatable relative to a surrounding rotor sleeve and about a central axis. At least one opening extends between an inner surface and an outer surface of the rotor. An externally threaded leadscrew extends through the rotor and along the central axis. An internally threaded nut is located within and mated to the rotor so as to rotate with the rotor about the central axis and ride along the leadscrew. A first cavity is located between the nut and a first bushing set against the inner surface of the rotor and a second cavity is located between nut and a second bushing set against the inner surface of the rotor. The at least one opening in the rotor forms a passage between the first and second cavities and is defined between the sleeve and nut so as to communicate excess lubricant.

Abstract: An arrangement for transferring and/or grouping products (32) is proposed, comprising at least one mover (20) which has at least one permanent magnet (19) which is connected to the mover (20), wherein the permanent magnet (19) interacts with at least one coil plane (18) of a drive surface (13) for the in particular contactless driving of the mover (20), wherein the mover (20) is arranged displaceably and/or rotatably in at least two degrees of freedom on the drive surface (13), furthermore comprising at least one conveying system (34, 38) which conveys products (32), characterized in that the mover (20) picks up or deposits at least one product (32) by means of a movement of the mover (20) with at least one vertical component.

Abstract: A secondary part of a synchronous motor has a protective device for magnets. The secondary part has a plurality of magnets evenly spaced on a magnet support. The protective device has a web for insertion into the gap between adjacent magnets. The web has a first and second flange at its two ends, so that the web and the flanges form a double-T structure, and the flanges rest against outer edges of the adjacent magnets.

Abstract: An apparatus includes a load, a lever that is coupled to the load, and an electric motor that is coupled to the lever for driving the lever in oscillatory, rotary motion about a pivot axis. The electric motor includes an armature and a stator. The armature is coupled to the lever and includes a permanent magnet. The stator defines an air gap within which the armature is disposed. The stator is configured for creating magnetic flux across the air gap for the permanent magnet to interact with, thereby to drive motion of the load. The electric motor is configured such that substantially no detent forces (a/k/a cogging forces) are generated between the stator and the permanent magnet as the lever is driven by the motor.

Abstract: Provided are an actuator capable of easily aligning the center axis of an entire apparatus including a mover and a stator, and a method of manufacturing the actuator. The actuator includes a mover unit which includes a mover having a magnetic field part attached to a peripheral surface of center part of a shaft, bearing parts provided on both end parts of the shaft, a cylindrical body which houses the center part of the shaft and the magnetic field part therein, and has both end parts connected to the bearing parts. A stator in which coils are wound on a core and case bodies are fixed to each other by screws, and then the mover unit is inserted into a fixed body of the stator and the case bodies from an opening side of the case body.

Abstract: An electronic device may be provided with an electronic compass. The electronic compass may include magnetic sensors. The magnetic sensors may include thin-film magnetic sensor elements such as giant magnetoresistance sensor elements. Magnetic flux concentrators may be used to guide magnetic fields through the sensor elements. To reduce offset in the electronic compass, the magnetic flux concentrators may be demagnetized by applying a current to a coil in the housing. The coil may be formed from loops of metal traces within a printed circuit or other loops of conductive paths. Magnetic flux concentrators may have ring shapes. A ring-shaped magnetic flux concentrator may be formed from multiple thin stacked layers of soft magnetic material separated by non-magnetic material.

Abstract: A coil arrangement has at least four coil cores around which in each case a coil winding is disposed, wherein the coil cores project over the coil windings in each case with a first coil core end region and a second coil core end region, wherein the coil arrangement furthermore has a first yoke part and a second yoke part. The first and second coil core end regions of the first and second coil core are in each case disposed opposite a first yoke side face of the first or second yoke part respectively, and the first and second coil core end regions of the first and second coil core are in each case disposed opposite a second yoke side face of the first or second yoke part respectively.

Abstract: Multiple arrays of linear motors and generators are combined in a radial configuration to provide high mechanical efficiency to deliver power in a single plane of motion to a common crankshaft. Magnet core assemblies for the motors and generators use powerful rare earth magnets positioned within an outer flux containment shell with a highly-magnetically-permeable ferrous-alloy to provide high power density. The motor magnet stack is attached directly to a link rod that connects to the crankshaft. Pulsed power is provided to electromagnetic coils coils by microcomputer control, and coil energy is recovered at the ends of the linear stroke. A controller energizes the coils in certain combinations of coil location and polarity in order to produce bi-directional mechanical motion. Energy that is released when coils are switched off is harvested as voltage pulses returned to standby batteries or capacitors, or the electrochemical cells.

Abstract: A primary part of an ironless linear motor includes a cooling plate on which flat coils are disposed, each having a central opening. The coils are pressed onto the cooling plate by holding pieces which taper toward the cooling plate and engage in the openings in the coils. In this manner, an especially good contact is produced between the flat coils of the primary part and the cooling plate prior to encapsulating the primary part with a synthetic resin, the cooling effect of the preferably actively cooled cooling plate thereby being increased markedly.

Abstract: A passive radiator structure includes an integrally formed diaphragm structure and a surround suspension. The diaphragm structure includes a diaphragm, a frame, and a web-like spider having a plurality of suspension arms integrally extended to between the diaphragm and the frame. The surround suspension has a radially inner gluing edge adhered to a radially inner location of the diaphragm structure around the diaphragm, and a radially outer gluing edge adhered to a radially outer location of the diaphragm structure around the frame. The surround suspension and the web-like spider of the diaphragm structure form two suspension elements for stably supporting the diaphragm, enabling minimized irregular shaking and reduced weight of the diaphragm, as well as reduced sound distortion, increased compliance and upgraded efficiency of the passive radiator structure.

Abstract: The present disclosure provides an electromagnetic speaker, includes a frame having an elongated axis; a vibration unit accommodated in the frame, the vibration unit comprising a magnet assembly, the vibration unit further including a passage; a spring elastically deformable along the elongated axis and elastically suspending the magnet assembly in the frame; a guiding pole sleeved by the spring and at least partially passing through the passage for providing a guidance to the vibration unit; a voice coil fixed relative to the frame and surrounding the magnet assembly; a diaphragm driven by the vibration unit for radiating sounds. When the electromagnetic speaker is mounted in a mobile phone, the diaphragm vibrates along a direction parallel to the screen, and the amplitude thereof will not be affected by the height of the mobile phone.

Abstract: A camera module including a lens unit configured to move in a direction of an optical axis and a direction perpendicular with respect to the optical axis; a housing unit accommodating the lens unit; and a shock absorbing member disposed between the housing unit and the lens unit to reduce impacts and noise generated when the housing unit and the lens unit collide.

Abstract: An haptic actuator includes: a base member; a hollow cylindrical coil arranged in the upper portion of the base member; a core formed in the base member and arranged so as to be inserted into the center of the coil; a cover member covering the upper portion of the base member; a vibration plate mounted on the cover member, arranged in the upper portion of the core, and moving in the vertical direction; and a vibration unit coupled to the vibration plate and spaced apart from the upper portion of the core. The vibration plate has a mounting portion fixedly mounted on the central area of the cover member and a coupling portion formed so as to extend from the mounting portion and be bent in the downward direction. The vibration unit has a permanent magnet coupled to the coupling portion and spaced apart from the core.

Abstract: A motor driven compressor apparatus includes a first stage compressor, a second stage compressor, an electric motor disposed between and coupled to the first stage compressor and the second stage compressor, thermal sensors disposed on the electric motor and configured to externally measure internal temperatures of the electric motor or internal bearings or components, and an external controller coupled to the electric motor and to the thermal sensors, and configured to at least one of slow down a speed of the electric motor and shut down the electric motor in response to at least one of an excess of a predetermined internal temperature and a rate of internal temperature change.

Abstract: Provided is a motor drive device for a motor for a washing machine of a double-rotor/double-stator structure that can selectively rotate a pulsator and a dehydrator without having a separate clutch, and a motor control method thereof. The motor drive device includes: a motor controller that generates a drive signal according to a laundry control signal to thus control a motor for the washing machine to be driven: an inverter that generates three-phase alternating-current (AC) power under the control of the motor controller, and outputs the three-phase AC power to a first three-phase stator coil for rotating an outer rotor in the motor for the washing machine, and a second three-phase stator coil for rotating an inner rotor therein; and a rotor drive controller that is provided between the inverter and the second three-phase stator coil, to thus block or pass the three-phase AC power under the control of the motor controller and simultaneously change the direction of rotation of the inner rotor.

Abstract: Provided is a lens barrel comprising a lens holding member that holds a lens; a guide axle that extends in a direction parallel to an optical axis of the lens; and an oil-retaining bearing that is fixed to the lens holding member, and into which the guide axle is slidably inserted. In the lens barrel, the guide axle and the oil-retaining bearing may be made of metal, and at least a portion of the lens holding member to which the oil-retaining bearing is fixed may be made of resin.

Abstract: A spring-less buried magnet linear-resonant motor is provided. The motor includes a buried magnet system and a stator operable to produce an alternating magnetic field exerting alternating axial forces on the buried magnet system that has a self-centering force and a required stiffness to reciprocate at a frequency near an alternating current (AC) supply frequency.

Abstract: A hand-held power tool is disclosed. The power tool has a linear motor with a rotor, an exciter piston that is coupled mechanically to the rotor, and a bearing device with a rotor mounting to support the longitudinal movement of the rotor and an exciter piston mounting to support the exciter piston. The rotor mounting and the exciter piston mounting form a three-point mounting, which is the sole bearing for the rotor and the exciter piston.

Abstract: A vibration generator includes a circumferential wall portion, a vibrating body arranged inside the circumferential wall portion in an opposing relationship with a coil and configured to reciprocatingly vibrate in one direction, a band-shaped leaf spring arranged between the vibrating body and the circumferential wall portion to support the vibrating body on the circumferential wall portion, and a damper member including a base portion attached to one of the vibrating body and the leaf spring and a tip end portion extending toward the other of the vibrating body and the leaf spring. The tip end portion of the damper member makes sliding contact with the leaf sprig or the vibrating body.

Abstract: An electromagnetic force driving device having reduced size and weight, and easily changeable electromagnetic characteristics and holding force, is provided. The device includes: a first housing; a second housing installed under the first housing; a partitioning wall partitioning the first and second housings; a first mover installed on a top of the first housing; a coil unit installed at a lower portion of the second housing to be movable according to a direction of current supplied; a second mover including one end combined with the coil unit, and another end passing through the partitioning wall and connected to the first mover to operate the first mover according to a movement of the coil unit; an upper magnet installed in the first housing to maintain a predetermined position of the first mover; and a lower magnet arranged in the second housing to form a magnetic field at the coil unit.

Abstract: An electromagnetic force driving device having reduced size and weight, and easily changeable electromagnetic characteristics and holding force, is provided. The device includes: a first housing; a second housing installed under the first housing; a partitioning wall partitioning the first and second housings; a first mover installed on a top of the first housing; a coil unit installed at a lower portion of the second housing to be movable according to a direction of current supplied; a second mover including one end combined with the coil unit, and another end passing through the partitioning wall and connected to the first mover to operate the first mover according to a movement of the coil unit; an upper magnet installed in the first housing to maintain a predetermined position of the first mover; and a lower magnet arranged in the second housing to form a magnetic field at the coil unit.

Abstract: Approaches to improving actuator settle time by damping vibrations resulting from coil modes, such as with a voice coil actuator in a hard disk drive, include a single-piece damper plate coupled to the voice coil actuator yoke. The damper plate may be a single U-shaped piece of metal that covers the area of the yoke that experiences the maximum strain energy during operation, between the voice coil and the pivot bearing housing.

Abstract: An active guiding and balance system that retains the active control of an elevator system in the presence of displacement. This active control may be maintained via the use of an actuator that tailors Lorentz force relative to the level of displacement along a non-linear continuum.

Abstract: An impedance matching device includes a first variable capacitor connected to an RF power source and including a first shaft moving linearly, a first linear motion unit axially coupled to the first shaft of the first variable capacitor to provide linear motion, a first insulating joint connecting the first shaft to a first driving shaft of the first linear motion unit, and a first displacement sensor adapted to measure a movement distance of the first driving shaft of the first linear motion unit.

Abstract: A multi-head linear motor with cores according to an embodiment includes a permanent magnet field and an armature. The permanent magnet field includes P pieces of permanent magnets. The armature is arranged so as to face the permanent magnet field through a magnetic air gap and includes M pieces of armature coils. Any one of the armature and the permanent magnet field constitutes a mover, the other constitutes a stator, and the mover is arranged in plurality to be lined up over a single piece of the stator to individually drive the movers relative to the stator. Moreover, the movers each include a large thrust mover and a small thrust mover that have different relationships each determined with a magnetic pole number P of the permanent magnets and a number M of the armature coils relative to the stator.

Abstract: A multihead-type coreless linear motor includes a permanent field magnet having P permanent magnets that are arranged such that different magnetic poles appear alternately, and an armature having M armature coils that are closely wounded and connected in three phases. One of the armature and the permanent field magnet is configured as a moving part and the other is configured as a stator. A plurality of moving parts are arranged on the same stator and are driven separately. In this multihead-type coreless linear motor, the plurality of moving parts includes a large-thrust moving part and a small-thrust moving part that are different in relationship with the stator, the relationship being determined by the number of magnetic poles P of the permanent magnets and the number of armature coils M.

Abstract: A battery powered raise climber system is provided that uses Lithium ion batteries to drive a single or double electric drive for an existing raise climber. The batteries offer a faster, safer, quieter and cleaner way to move workers and their equipment to and from the work face in a raise and eliminates the need for adding lengths of hose as the raise climber ascends and eliminates the emission of harmful inhalants. The battery powered system also enables high efficiency area lighting to be used at the work face, and as the raise climber descends in the raise, the electric drives can reverse operation to recharge the batteries.

Abstract: An electric motor 1 includes a rotor core 22 having n pieces of teeth T arranged in the circumferential direction around which a coil wire 23 is wound, a commutator 24 having n pieces of segments 24a 24b, and 24c, and the coil wire 23 having a connecting wire portion 23a that connects the teeth T and the segments 24a, 24b, and 24c and a crossover portion 23b that interconnects the segments 24a, 24b, and 24c at the opposite pole positions of the commutator 24 around a shaft 23. The crossover portion 23b that connects the i-th (i=1 to n) and the (i+n/2)th of the segments 24a, 24b, and 24c is wound prior to the connecting wire portion 23b that connects the teeth T connected with the i-th segment 24a, 24b, 24c and the (i+1)th segment 24a, 24b, 24c, respectively.

Abstract: A linear vibrator is disclosed. The linear vibrator includes a housing having a base and a cover, a number of elastic members connected to the housing, a vibrating unit suspended in the housing by the elastic members, and a coil positioned in the housing. The base has a bottom wall and a plurality of sidewalls extending vertically from the bottom wall. The vibrating unit has a magnet assembly and vibrates along a direction parallel to the bottom wall.

Abstract: A linear vibrator is disclosed. In accordance with an embodiment of the present invention, the linear vibrator includes a base, a coil unit, which is coupled to the base, a magnet, which is coupled to the coil unit such that the magnet can move relatively with respect to the coil unit, and a leaf spring, which is interposed between the magnet and the base and includes a plurality of plate-shaped members having center portions thereof being separated from one another and both respective ends thereof being coupled to one another. Thus, the linear vibrator can increase the range of displacement in the leaf spring and increase the magnitude of vibration in the linear vibrator.

Abstract: A piston position detecting device includes a position sensor, a fixing screw for attaching the position sensor to an outer periphery of the cylinder tube through the intermediary of a sensor attachment bracket, a nut plate into which the fixing screw is screwed, and a protecting cover covering the position sensor and the fixing screw, wherein the position sensor and the protecting cover are able to be concurrently mounted to the cylinder tube using the fixing screw through the intermediary of a sensor attachment bracket by forming the nut plate from a portion of the protecting cover, and in addition, when the position sensor is position-adjusted, the position sensor and the protecting cover are enabled to be displaced together.

Abstract: A permanent magnetic actuator includes a flux inducing unit having a hollow space therein and formed by laminating a plurality of plates, a movable element disposed in the hollow space of the flux inducing unit to be reciprocated, permanent magnets installed at inner walls of the hollow space, and guide members located between the permanent magnets and the movable element and configured to guide reciprocating motion of the movable element.