Abstract: A moving magnet actuator (MMA) includes a magnetically conductive end-ring that is spaced from a magnet pole piece. The end-ring is constructed and spaced to provide a desired counter or anti-cogging force when the MMA is in a powered state. The MMA is also constructed such that a central portion of its armature stroke is axially displaced from a radial centerline of the magnetically conductive conduit enclosing the MMA components.

Abstract: The present invention proposed a voice coil motor and a method of using magnetic restoring force for displacement control. The voice coil motor comprises a magnetic member and an electric member. The magnetic member generates a magnetic field. The electric member includes at least a coil and a ferromagnetic component. The coil can generate thrust when current is applied, and the ferromagnetic component can generate magnetic restoring force and normal coupling force. The voice coil motor further includes a suspension member, and is characterized in that the normal coupling force can preload the suspension member to eliminate the tilt angle and free play. Through the balance between the thrust generated by the coil current and the magnetic restoring force, open-loop displacement control can be accomplished without any elastic component.

Abstract: A vibrator includes a voice coil and a vibrating member that vibrates along the axial direction of the voice coil when it is excited by application of an alternating current thereto. A suspension supports the vibrating member vibratably in the axial direction. A casing houses the voice coil, the vibrating member, and the suspension. A buffering member is provided so that the vibrating member strikes the buffering member when the vibration amplitude of the vibrating member has exceeded a predetermined value in a resonance region around the resonance point of the vibrating member.

Abstract: A linear actuator includes a driving part having an inner yoke, an outer yoke and a coil for generating an alternating magnetic field and includes a movable body provided with a magnet disposed between the inner yoke and the outer yoke. The movable body is formed in a tubular shape having an aperture edge part at least one end is opened, and the aperture edge part or a portion near the aperture edge part disposed between the inner yoke and the outer yoke is positioned closer to the inner yoke side than to the outer yoke side. Alternatively, the linear actuator may includes an expansion preventing member which is disposed at the aperture edge part or the portion near the aperture edge part for preventing the aperture edge part from expanding.

Abstract: A linear generator apparatus includes first and second elongate coaxial bodies that are axially movable relative to one another with a reciprocating movement. The first body is axially and freely movable relative to the second body within a predetermined displacement range or free zone. A helical spring connecting to both first and second bodies biases the first body toward the free zone relative to the second body when outside of the free zone. An electrical power generator mounted on both first and second bodies generates power when the first and second bodies axially move relative to one another within the free zone and beyond. The invention also relates to a suspension system for motor vehicle that includes a coil spring and the apparatus in replacement of a conventional shock absorber.

Abstract: An electromagnetic exciter includes a first suspension having a cylindrical side wall portion coaxial with respect to a cylindrical wall of a yoke of a magnetic circuit assembly, and a spring portion integrally formed at the lower end of the cylindrical side wall portion to support the lower end of the magnetic circuit assembly so that the magnetic circuit assembly is vibratable. An annular support member is secured to the inner peripheral surface of the upper end opening of the cylindrical side wall portion of the first suspension. A printed wiring board that supports a voice coil is supported on the annular support member. A protector has a cylindrical portion installed to cover the outer peripheral surface of the cylindrical side wall portion of the first suspension, and a caulking portion that is bent radially inward over the upper end edge of the cylindrical side wall portion of the first suspension to clamp the printed wiring board between itself and the annular support member.

Abstract: A vibrator of the present invention comprises a coreless coil (2), a driver (4) including a magnet (4a) inserted in the coreless coil (2), a yoke (4b) for pinching the coreless coil (2) and facing the magnet (4a), and a top plate (4c), suspensions (6 and 8) for carrying resiliently the driver (4). The driver (4) is reciprocated in an axial direction of the coreless coil (2) by applying an alternate current to the coreless coil (2) to generate vibrations. The vibrator can be miniaturized without increasing a cost and has a good rising of vibrations.

Abstract: A wind energy generator has a generator having a shaft extending therefrom, a plurality of blades interconnected to the shaft so as to be rotatable by the action of wind energy, and an elongate chamber cooperative with the shaft such that the chamber rotates relative to a rotation of the shaft. The elongate chamber has a coil extending therearound. A magnet is positioned within chamber such that a movement of the magnet interacts with an electrical field of the coil so as to produce electrical energy therefrom. Separate elongate chambers are associated with each of the blades of wind energy generator.

Abstract: A tactile panel includes a vibration panel, a yoke provided to face the vibration panel, drive coils secured on a circumference of the vibration panel, and a set of permanent magnets arranged between the vibration panel and the yoke. The vibration panel is held by panel holding members, into which both sides of the vibration panel are inserted in a direction substantially perpendicular to a vibration direction of the vibration panel.

Abstract: An axially actuating device having an elastic joining portion is provided, which is used for carrying an object and actuating the object to move axially, and comprises a fixed portion, a moving portion, and a joining member. The joining member is used to combine the fixed portion with the moving portion, such that the fixed portion and the moving portion are axially coupled with each other. Moreover, the fixed portion and the moving portion are respectively a fixed magnet and a coil, such that when a current is applied to the moving portion, the moving portion generates a relative displacement with respect to the fixed portion according to the current, so as to provide an axial displacement. Meanwhile, the moving energy is generated due to the repulsive interaction of the magnetic field, and thus a shock proofing efficacy is also provided.

Abstract: A toroidal-coil multi-phase linear stepping motor includes a cylindrical housing, an axis coaxially arranged inside the housing, a cylindrical element supported by the axis and an armature fixed to the housing around the cylindrical element through an air gap in the radial direction. The axis is fixed to the housing and the cylindrical element linearly moves along the axis. The cylindrical element has toroidal permanent magnets that are alternately magnetized in N pole and S pole in the axial direction. The armature consists of armature units arranged around the axis. Each armature unit has a toroidal coil and a pair of armature yokes that hold the toroidal coil. Each armature yoke has toroidal magnetic teeth on its inner surface. The invention also includes a toroidal-coil single-phase linear reciprocating motor and a cylinder compressor and a cylinder pump using these motors.

Abstract: There is provided a linear motor in which the number of armature windings can be reduced, and an armature iron core can be readily fixed to a member for supporting the armature iron core. Each of three inductors 1A to 1C is so arranged that a tooth row 7 therein is located on each side thereof in a width direction thereof orthogonal to a moving direction of an armature 3. The three inductors are arranged spaced apart from each other by a predetermined spacing in the width direction. An armature iron core 9 of the armature 3 includes four magnetic pole portions 15A to 15D and three yoke portions 17A to 17, and is constituted by a plurality of electromagnetic steel plates laminated in the moving direction of the armature 3. The four magnetic pole portions 15A to 15D are arranged in parallel and spaced apart from each other by a predetermined spacing so that each of the three inductors 1A to 1C is positioned within the spacing.

Abstract: A magnetic actuator. A yoke includes a first opening and a second opening, a frame, and a path. A first magnet is disposed in the first opening in the vicinity of the frame. A second magnet is disposed in the second opening in the vicinity of the frame. A coil comprises a wire surrounding the path. A light shield is connected to an end of the coil. A guiding element disposed outside the path is connected to an end of the coil. When current passes through the coil, the coil moves along the path by magnetic induction between the first magnet and the second magnet such that the iris diaphragm is adjustable by the light shield. When there is no current through the coil, dynamic force produced by the guiding element returns the light shield to its original position.

Abstract: A lens moving mechanism which includes a moving lens for zooming or focusing; a lens holder holding the moving lens in a lens-barrel, and being supported freely movably into an optical axis direction of the moving lens; a guide shaft guiding the lens holder into the optical axis direction of the moving lens when the lens holder moves; a drive magnet attached to the lens holder; a drive coil fixed to the lens-barrel with at least part of the drive coil opposed to the drive magnet and giving an impelling force into the optical axis direction to the lens holder by being electrified; and a magnetic body fixed to the lens-barrel and located to oppose to the drive magnet on an opposite side of the drive magnet with at least a part of the drive coil put between the magnetic body and the drive magnet, and attracting the drive magnet.

Abstract: An electrical short stroke actuator, comprising an annular filed collar and a composite plunger for travelling therethrough. In its simplest form, the plunger comprises two permanent magnets with like poles facing, and which are housed within a thin walled tube, and separated by a central spacer. By judicious choice of the spacing of the magnets, and the length of the field coil, a substantially constant thrust profile is achieved over a pre-selected stroke of the field coil relative to the plunger. The thrust may be augmented by fabricating the means used for spacing the magnets wholly or in part from ferromagnetic material, and also adding collars, similarly fabricated, onto the outside face of each of the permanent magnets.

Abstract: An autofocus actuator is provided by which it is possible to easily confirm that a holder and a yoke do not make contact with each other even when the space between the holder and the yoke is made as small as possible in order to improve shock resistance. The autofocus actuator includes light transmission holes for confirming a space between an inner peripheral surface of an inner cylindrical portion of the yoke and an outer peripheral surface of a cylindrical portion of the holder provided with a lens unit and being capable of adjusting its position in the optical axis direction by supplying electrical power to a coil secured to the holder. The light transmission holes are provided at predetermined positions of a flange portion of the holder and a stopper for attaching a leaf spring to the holder, respectively, so that light can pass therethrough.

Abstract: A system and method are disclosed for controlling an integrated rotary-linear actuator system that may be coupled to a network via a network interface. The integrated rotary-linear actuator system includes a control system and a rotary-linear actuator having a moveable plunger and associated coils. The coils may be energized to interact with associated magnets to effect corresponding movement of the plunger, which may include rotation and/or linear movement. The network interface facilitates receipt of control information at the control system of the integrated rotary-linear actuator system from the network. The control system may control an amplifier to energize the coils based on the control information.

Abstract: An actuator includes a casing, a stationary member having a coil member and mounted in the casing and a movable member having a moving element and supported by the casing. The moving element has a shaft and is supported by the casing so as to be moved in an axial direction of the shaft and in a rotational direction having the axial direction of the shaft as its rotational axis and the moving element is moved in the axial direction and in the rotational direction by causing electric current to flow through the coil member. The stationary member includes a first stationary member for imparting to the movable member a force oriented in the axial direction and a second stationary member for imparting to the movable member a force oriented in the rotational direction, while the coil member includes a first coil member for exciting a first magnetic path passing through the first stationary member and a second coil member for exciting a second magnetic path passing through the second stationary member.

Abstract: A linear motor and a linear compressor including said motor. The linear motor comprises a set of inner laminations (90), forming the stator, mounted around the outer circumference of a fixed member (60), and a set of outer laminations (30) mounted spaced from the inner laminations (90). An actuator (85) is connected to a movable member (80) and carries a magnet member (86) in the space defined between the inner laminations (90) and the outer laminations (30). The upper ends of the inner laminations (90) and outer laminations (30) are connected by a connecting element (100) made of a non-magnetic material, in order to stabilize the laminations and serve as a suspension mounting for the set of outer laminations (30). Application of electric current to a coil (95) causes the actuator (85) to move and carry the movable member (80) with it.

Abstract: A linear actuator has improved output performance and can be assembled with high precision. The linear actuator includes: a yoke part where yoke components, where a hollow is formed between an outer circumferential surface of a first yoke provided on one side of a ring-shaped permanent magnet and an inner circumferential surface of a second yoke provided on another side of the ring-shaped permanent magnet, are combined on an outer circumference of a guide pipe with end surfaces of the first yokes and/or end surfaces of the second yokes being in contact and magnetic poles formed in facing yoke surfaces having a same polarity; and a shaft-linked part where a coil bobbin, which is disposed in the hollow of the yoke part and around which a coil has been wound, and a shaft inserted into the guide pipe are linked. By switching the direction of the current flowing in the coil, relative movement between the yoke part and the shaft-linked part is reciprocally caused in an axial direction.

Abstract: Disclosed are a stator for a reciprocating motor and a manufacturing method thereof which are able to simplify assembling processes, to reduce assembling time, and thereby to improve productivity by laminating an inner stator to be a straight line shape and bending to be a cylindrical shape. The stator is fabricated by laminating lamination sheets as a straight line and bending it to be a cylindrical shape, and a mounting band is fixed on inner circumferential surface of the lamination sheets so as to maintain the lamination sheets connected when the lamination sheets are bent to be the cylindrical shape.

Abstract: In a linear motor having permanent magnets placed on a slider, the slider has slider blocks disposed in such a manner that relative positions between front ends of the slider blocks in a slider moving direction and salient poles of two stators opposing the slider blocks is shifted by approximately 130 to 230 electrical degrees. Because the positions of the frond ends of the slider blocks in the slider moving direction relative to the stator salient poles of SIDE-A are shifted from those of SIDE-B by P/2 corresponding to 180 electrical degrees, thrust ripples occurring on SIDE-A and SIDE-B have a relationship such that they are displaced by P/2. As a result, the thrust ripples of SIDE-A and SIDE-B are canceled, thereby reducing a thrust ripple with P/3 periodicity.

Abstract: A motor includes a rotor supported for rotation about an axis, at least one pair of rotor magnets spaced angularly about the axis and supported on the rotor, at least one reciprocating magnet, and an actuator for moving the reciprocating magnet cyclically toward and away from the pair of rotor magnets, and consequently rotating the rotor magnets relative to the reciprocating magnet.

Abstract: An improved hybrid variable reluctance linear forcer design of the type known as a Sawyer motor forcer is provided with a 6-phase magnetic design. The 6-phase magnetic design has reduced force ripple compared to existing 2/4-phase and 3-phase designs providing smoother motion with lower velocity ripple. Three identical electromagnets each having four salient toothed poles with each pole being spaced at a unique 30 degree phase increment form a 12-pulse force function equivalent to a 6-phase motor. The electromagnets are provided with split-phase windings, which enable balanced 3-phase amplifiers to drive 6-phase coils.

Abstract: A magnet assembly includes a back iron and an array of magnets. The back iron is in the form of a plate having opposed surfaces. The magnets are arranged along one of the surfaces, with the other surface being dimensioned and configured according to the magnetic field distribution associated with the magnets. The back iron geometry provides for reduced mass, reduced leakage flux, and high flux densities to improve performance of a linear motor that employs such a magnet assembly.

Abstract: An electric actuator that is capable of driving a motor in a cylindrical structure, such that the electric actuator itself can be expanded. The electric actuator includes: a motor for driving the electric actuator and a screw cylinder for connecting a shaft of the motor to a connecting part and for surrounding the external surface of the motor. The screw cylinder has right-handed and left-handed screw recesses formed thereon, and has first and second ball screw nuts. The first ball screw nut has a first electronic brake mounted thereon and the second ball screw nut has a second electronic brake mounted thereon, thereby enabling a non-stop reciprocating linear movement.

Abstract: Spring support having at least one axially moveable spring plate, an actuator with a rotor producing a rotational movement relative to its stator, which is converted into an axial movement of the spring plate, and a torsional locking element which prevents torsional movement of the spring plate.

Abstract: An apparatus and related method generate electrical power in a tubular housing, such as a drill collar, disposed in a borehole when drilling fluid flows through the tubular housing. The apparatus includes a stator adapted for being secured within the tubular housing against rotation relative to the tubular housing, a tubular rotor rotatably carried about the stator, and an impeller peripherally affixed to the rotor. The stator has an array of conductive windings therein, and is preferably an alternator stator. The rotor has an array of magnets therein, and is preferably an alternator rotor. Accordingly, drilling fluid flowing through the tubular housing when the apparatus is disposed therein engages the impeller and induces rotation of the rotor about the stator to generate electrical power.

Abstract: An apparatus for mounting semiconductors contains a bonding station, whereby the bonding station comprises a wafer table for presenting the semiconductor chips, a substrate table and a pick and place system with a bondhead with a chip gripper. Part of the wafer table is located underneath the substrate table. The pick and place system has a first linear motor that comprises a rigidly arranged stator and a shuttle that can be moved in a first direction guided by first guide elements, and a second linear motor that comprises a rigidly arranged stator and a shuttle that can be moved in a second direction. The shuttle of the first linear motor has second guide elements that guide the shuttle of the second linear motor. The bondhead with the chip gripper is arranged on the shuttle of the second linear motor.

Abstract: Disclosed herein is a simple, inexpensive linear actuator which is capable of controlling the displacement of the movable body by regulating the amount of electric energy applied without the necessity of detecting the displacement of the movable body with a displacement sensor or controlling the displacement of the movable body by feedback control in response to the detected value.

Abstract: Thread-guiding device for apparatus for winding a thread onto a support rotatable by associated actuating means, at least one element for receiving and guiding the thread to be wound, the element for receiving and guiding the thread to be wound being integral with a thread guiding device of the magnetic/electromagnetic.

Abstract: An apparatus for fixing a stator of a reciprocating motor includes: a frame fixedly installed in a case; a cylinder penetratingly inserted and coupled to the frame; a piston inserted in the cylinder and having a suction passage for sucking a refrigerant therein; an outer stator contacting with and supported by the frame; an inner stator formed as a cylindrical shape by laminating lamination sheets having a predetermined shape and inserted upon the frame or an outer circumferential surface of the cylinder so as to form a certain interval with an inner diameter of the outer stator; and a stator supporting means positioned at a stopping surface formed on the frame or the cylinder and supporting one side surface of the inner stator; wherein the stopping surface includes an inclined surface which is inclinedly formed such that the stator supporting means can be slidingly inserted thereinto.

Abstract: The present invention discloses a manual electric generating device, which comprises an upper casing, a lower casing; a rotor, a fixed stand, a hollow cylinder, a coil for generating power supply; and a printed circuit board for processing and outputting the power supply. The power supply is outputted to a portable electronic device for charging its battery or lighting up its indicating lamp.

Abstract: A portable telephone includes a telephone body containing telephone circuitry, a rechargeable cell, and a power generation device having a magnet structure, a coil, and a rectifier for generating a direct current (D.C.) voltage to charge the rechargeable cell. The magnet structure may be an armature and the coil may be fixed, or the magnet structure may be a stator and the coil may be movable. The magnet structure may be a multiple pole magnet made up of a plurality of individual pole structures, each pole structure including a pair of magnets joined to each other with facing poles of like polarity. In addition, the coil may include clockwise and counterclockwise windings arranged in a multi-layered stacked arrangement.

Abstract: The force motor of the present invention controls the local magnetic field through a uniquely designed mechanical structure of the internal components. The mechanical structure divides the magnetic field in the force motor into three sections. The force produced on the armature by the magnetic field in the first section increases exponentially as the armature approaches the housing. The force produced on the armature by the magnetic field in the second and the third sections, as the armature approaches the housing, counter balances the rise in the force due to the magnetic field in the first section. Thus, a flat F-S curve over a long stroke length is obtained.

Abstract: A linear motor of the present invention has: a stator having a stationary iron core and a magnet wire; a mover having a moving iron core and a magnet; and a plate-shaped elastic member for supporting the mover in a manner to rock in the rocking directions. This construction eliminates a sliding portion for supporting the mover so that it can reduce the loss, which might otherwise accompany the reciprocation of the mover. Moreover, a linear compressor using this linear motor is high in efficiency and reliability.

Abstract: An AC synchronous motor, also known as a stepper motor, uses its magnetics and drive coils to produce both motion and excitation for sets of position sensing coils. Each drive phase is equipped with one or more sensing coils, which may be differentially wound, with the coils configured to act as secondaries of a linear variable differential transformer (LVDT). The primary of the so-formed LVDT is the motor drive winding. The outputs from these coils are fed to a microprocessor or DSP through an internal or external A/D converter. The microprocessor or DSP decodes the measured voltages using resolver strategies to produce a position measurement. An alternate mode of operation uses these same coils to form a variable reluctance resolver. This alternative mode of operation could be used for sensing coarse position while the motor drive is not energized.

Abstract: Disclosed are a reciprocating motor and a reciprocating compressor having the same. The reciprocating motor comprises: an outer stator; an inner stator arranged at an inner circumferential surface of the outer stator with an air gap and at which a winding coil is wound; and a magnet arranged between the outer stator and the inner stator and linearly-moved when a power is applied to the winding coil. The winding coil is installed at the inner stator thus to reduce a usage amount of the coil, thereby reducing a fabrication cost of a motor. Also, a resistance of the coil is reduced thereby to enhance an efficiency of the motor.

Abstract: The invention refers to an electromagnetic force device arranged to provide a force, a shock absorber with such a force device, a scale with such a force device, a sewing machine with such a force device and a handling device with such a force device. The force device includes an elongated holder element (1), a first magnet element (2), which is connected to the elongated holder element (1) in such a way stationary in relation to the holder element, a second magnet element (3), which is slidably connected to the elongated holder element (1) in such a way that it is displaceable along the holder element towards and away from the first magnet element (2). At least one of said magnet elements (2, 3) includes an electromagnet. An effect unit (10) is arranged to provide an electric effect to said electromagnet for generating a force in a first direction.

Abstract: A pipe member of a fuel injection valve includes a magnetic pipe and a non-magnetic pipe in this order from the side of a jet nozzle plate. The non-magnetic pipe extends to the end of the fuel injection valve 10 opposed to the jet nozzle plate, and the non-magnetic pipe is formed with a fuel inlet. The non-magnetic pipe has the thickness of not less than 0.2 mm but not more than 1.0 mm. An end of the non-magnetic pipe on the side of the magnetic pipe is positioned on the side of a moving core relative to a facing portion of a fixed core that faces to the moving core, and on the side of the fixed core relative to a second end of a yoke connected to the magnetic pipe. The non-magnetic pipe covers the outer periphery of a gap defined between the moving core and the fixed core.

Abstract: An apparatus for fixing a stator of a reciprocating compressor includes: a frame fixedly installed in a case; a cylinder penetratingly inserted and coupled to the frame; a piston inserted in the cylinder and having a suction passage for sucking a refrigerant therein; an outer stator contacting with and supported by the frame; an inner stator formed as a cylindrical shape by laminating a plurality of lamination sheets forming ring grooves at both side surfaces thereof and inserted upon an outer circumference surface of the cylinder or the frame so as to form a certain interval from an inner diameter of the outer stator; at least one fixing ring having a ring shape inserted into the ring grooves; and at least one protrusion portion protruding formed around the center of the lamination sheets and pressed on an outer circumference surface of the cylinder.

Abstract: A secondary for a linear motor includes a body comprised of at least one secondary member for defining a guideway for a rotor of the linear motor and a cover including magnetizable material for the guideway. Disposed between the secondary member and the cover is an anti-skid layer to secure the cover against displacement.

Abstract: A linear oscillating actuator system which is capable of canceling out the stator vibrations for driving a load with a minimum of vibrations. The system includes an oscillator carrying a permanent magnet as well as an output shaft for connection to the load. A stator assembly is incorporated within a housing and is configured to movably support the oscillator and to carry an electromagnet. The electromagnet generates a magnetic field which interacts with the permanent magnet to reciprocate the oscillator relative to the stator assembly in a linear path. A balancer is added to the system for canceling out undesired stator vibrations. The balancer are commonly supported to the stator assembly to be driven thereby in parallel with the oscillator. The balancer is configured to have a mass generally equal to that of the oscillator and to be devoid of any output member.

Abstract: A linear motor includes a row of permanent magnets fixed at a position above a stator, and a plurality of magnetic pole members fixed at a position below a movable member. The row of permanent magnets is formed from N poles and S poles alternately arranged at given intervals. The plurality of magnetic pole members extend toward the row of permanent magnets and in a vertical direction and have the same height. The extremities of the magnetic pole members oppose the row of permanent magnets via an air gap. The magnetic pole members are coated with insulators, and a former-wound coil is fitted around the insulator. The part of the magnetic pole member coated with the insulator, except for the extremity thereof, is made thin by the amount corresponding to the thickness of the insulator.

Abstract: A positioner (20) for a disk drive (10) that includes a magnet assembly (52), a conductor assembly (54), and a control system (22) is provided herein. The magnet assembly (52) includes a pair of magnet arrays (56A) (56B) and a pair of spaced apart flux return plates (75A) (75B). The conductor assembly (54) includes at least a first coil array (80) and a second coil array (82) that are substantially co-planar. The control system (22) directs current to electrically excite the coil arrays (80) (82) to maintain a data transducer (50) on a target track (32) of a storage disk (28).

Abstract: An exciter for directly vibrating a board, which enables a sufficient rotational torque to be obtained by a work tool at the time of attachment or detachment, provided with a magnetic circuit unit having an outside yoke comprised of a side wall and a bottom, a permanent magnet fastened to the bottom, and an inside yoke and with a coil inserted into a clearance between the side wall and inside yoke, the magnetic circuit unit being vibratably supported at the coupler member by elastic members, the coupler member being screwed with the bracket member fastened to the surface of the board, two parallel flat surfaces engaging with ends of a work tool being provided at an outer circumference of the outside yoke, and the work tool being turned to attach/detach the coupler member with respect to the bracket member.

Abstract: A magnetic motion device is disclosed, wherein a permanent magnet slides back and forth along a pivoting rail due to the interaction between the slide's magnetic field, the magnetic fields produced by a permanent/electromagnet combination at each end of the rail, and gravitational force. The ends of the rail thereby move up and down in a reciprocating, “see-saw” fashion. Power-take-off mechanisms can be connected in any suitable manner to the device, so that the motion of the rail can power an external device such as a pump.

Abstract: A linear electric motor, capable of producing reciprocation of a piston within a cylinder to compress refrigerant gas. The coil of the linear electric motor is mounted to the internal wall of a block that forms the cylinder of the compressor, and a support for the magnets is mounted to an outwardly extending base flange of the piston. The support is formed by a base plate mounted to the base flange with a plurality of “L” shaped finger plates spaced around and affixed to the base plate, with the edges of the long legs of the finger plates extending radially of the piston's central axis. Arcuated shaped permanent magnet are fitted between the opposite flat sides of each pair of the long legs of the finger plates to form a stable and rigid toroidal shaped magnet assembly positioned between the external wall of the cylinder and the coil.

Abstract: An apparatus for converting vibration energy into electric power is provided, in which vibration of a power source is transmitted to a power-generating coil 14, and is then transmitted to an iron core 20 via helical compression springs 26 and 28, thereby causing relative movement between the iron core 20 and the power-generating coil 14 due to inertia, resulting in a change in the magnetic field. An electromotive force is thus generated due to electromagnetic induction, thereby causing a current to flow to an electric wire material 18. Specifically, use of vibration of the power source as energy for power generation can achieve efficient use of energy. The acquisition of electric energy by the power generation may also lead to mitigation of the vibration.

Abstract: Disclosed herein is an apparatus and method for controlling a linear compressor. The linear compressor control apparatus has a collision detection unit, a control unit, and a compressor driving unit. The collision detection unit detects a collision of a piston with a valve due to the operations of the linear compressor. The control unit determines whether the collision of the piston occurs on the basis of an output signal from the collision detection unit, and resets maximum amplitude data of the piston of the linear compressor when the collision occurs. The compressor driving unit controls the maximum amplitude of the piston of the linear compressor under the control of the control unit.