Abstract: A linear motor including a plurality of movers (1a to 1c), each of which is formed with an armature having a polyphase balancing winding (Ru to Rw), and a stator having a permanent magnet or a secondary conductor is configured such that the plurality of movers (1a to 1c) are disposed on the single stator; and the polyphase balancing windings (Ru to Rw) in the respective movers (1a to 1c) are connected in series. Accordingly, there can be obtained an inexpensive linear motor which is capable of driving a large machine, which is capable of canceling cogging force, which offers facilitated assembly of movers, and which can provide thermal protection of the movers with ease.

Abstract: An inertial actuator for active vibration control utilizes a single cylindrical actuator module of the “voice coil” type. A moving armature assembly, including a soft iron shell with a tubular sleeve coaxially surrounding a core with two permanent magnets and corresponding pole plates, is suspended compliantly by a flexure assembly including a multiple-stack array of shaped flexure strips and a pair of end support flexure plates mounted to a base. Two magnetically charged annular air gaps at the pole plates in the moving armature traverse two corresponding annular coils wound in a tubular bobbin that extends as a heat-sinking mounting column attached to the base. This form of inertial actuator provides cost benefits along with improved performance and reliability due to the stability of the moving parts and uniformity of linear motion.

Abstract: An autofocus actuator 1 is provided with a yoke 300 that comprises an inner cylindrical portion 301 defining an insertion bore through which a hollow body portion of a holder is adapted to be received and an outer cylindrical portion 302 provided outside of the inner cylindrical portion 301 with a predetermined spacing left between the inner cylindrical portion 301 and the outer cylindrical portion 302 by a connecting portion, and the yoke 300 is constructed so as to receive a coil 20 in the space of a predetermined gap. The outer cylindrical portion 302 is formed into a generally polygonal cylindrical shape and inner surfaces of the outer cylindrical portion 302 define a plurality of magnet mounting surfaces each having a planar shape. A generally flat plate shape permanent magnet 41 is mounted on each of these magnet mounting surfaces 303.

Abstract: A vibrator has a cup-shaped casing, a substrate provided to close an upper end opening of the casing, a magnetic circuit assembly provided in the casing, a first suspension and a second suspension that support the magnetic circuit assembly from above and below, and a voice coil secured to the substrate and inserted into a magnetic gap in the magnetic circuit assembly. The first suspension has an inner fixed portion that is secured to the substrate and that has a radially inner ring-shaped portion and a pair of extensions extending radially outward from mutually diametrically opposing positions on the ring-shaped portion. The first suspension further has a pair of leaf spring portions arcuately extending from the respective extensions through an angle of about 270 ° in symmetry to each other around the axis of the voice coil.

Abstract: The solenoid is capable of generating great thrust and having broad-ranging thrust characteristics. The solenoid of the present invention comprises: a guide pipe formed into a cylindrical shape and provided inside of an excitation coil; a movable element having a small diameter section and a large diameter section; a first yoke part covering one end face of the excitation coil, the first yoke part having a first facing surface, which faces an outer circumferential face of the small diameter section of the movable element, and a second facing surface, which faces one end face of the small diameter section; and a second yoke part covering the other end face of the excitation coil, the second yoke part having a third facing surface, which faces an outer circumferential face of the large diameter section of the movable element, and a fourth facing surface, which faces one end face of the large diameter section.

Abstract: A light direction assembly comprises a tip-tilt platform having a light direction member and at least one current coil coupled to the tip-tilt platform. The light direction assembly also includes a plurality of magnetic producing devices that are positioned in close proximity to the current coil. The magnetic producing devices are configured to selectively tilt the tip-tilt platform in response to a current flowing through the current coil. At least one shorted turn is also included in light direction assembly and is positioned in close proximity to the current coil.

Abstract: A drive unit for performing precise linear movement of a driven object comprises a motor having a cylindrical stator and a cylindrical rotor that is coaxially put in the cylindrical stator and capable of rotating relatively to the cylindrical stator, a movable barrel for holding a driven object mounted for rotation in the cylindrical rotor, a motion transformation mechanism comprising an internal helical groove formed in the cylindrical rotor and an external helical thread formed on the movable barrel which engage with each other so as to cause relative rotation between the cylindrical rotor and the movable barrel when the cylindrical rotor rotates, thereby transforming rotational movement of the rotor into a linear movement of the movable barrel, and a head-on striking structure provided between the helical groove and the helical thread to restrict the relative rotation at an intended extreme end of an axial path of the movable barrel.

Abstract: A planar positioning system having a rigid base, and first and second linear actuator means mounted to the rigid base, the first and second linear actuator means being arranged orthogonal to one another. A rigid reference surface (2A, 2B) is mounted to the base, (1) and a moveable platform (17) for holding a workpiece is supported for movement on the rigid reference surface (2A, 2B). First and second guiding means are coupled to moveable portions of the respective first and second actuator means, the first and second guiding means being arranged to bear on the moveable platform for transmission of forces thereto from the respective first and second actuator means to effect movement of the platform (17) on said rigid reference surface (2A, 2B). The first actuator means may comprise two linear actuators (4A, 4B) parallel to one another and spaced apart with the second linear actuator means (8) orthogonal thereto and arranged in an H-shaped configuration.

Abstract: An autofocus actuator includes a cover which is provided with elastic tabs in addition to protrusions to which a stopper attached to a holder with a lens unit abuts when the holder is excessively displaced by, for example, a fall of an electronic equipment provided with the autofocus actuator. The protrusions are provided on the peripheral edge of an opening formed in the cover, and the elastic tabs are also provided on the peripheral edge of the opening. Each of the elastic tab has one end which is supported on the cover and the other end which protrudes from the peripheral edge of the opening in a cantilever manner so that the other end makes abutment with the stopper attached to the holder before the stopper makes contact with the protrusions to thereby absorb a shock applied to the holder.

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: 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: 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: There is provided a uniaxial drive unit using a linear motor having a fixed part which is a rod-shaped magnet fixed to a unit body and formed so that the N poles and the S poles are arranged alternately; and a moving part which is a ring-shaped member having a coil member, fitted on the fixed part, and capable of moving along the fixed part. A driving section provided so as to be slidable in the uniaxial direction with respect to the unit body is connected to the moving part or a balance weight fixed to the moving part by a winding motion transmission member via a winding motion transmitting support member provided near one end or both ends of the unit body.

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: A surface-mountable linear vibrator includes a hollow cylindrical housing of a predetermined thickness having a space therein. An elastic member is fixed to an inner surface of the housing. A vibrating body includes a yoke fixed to the elastic member to be affected by elastic force in an axial direction of the housing, a weight fixed to the yoke, and a magnet fixed to the yoke. A circular substrate member is attached to a lower part of the housing, and provided with (i) a winding coil fixed to the upper surface thereof and (ii) a connection element formed on the lower surface thereof and electrically connected to the winding coil. Power is applied to the winding coil through the connection element.

Abstract: A solenoid plunger system for an electropneumatic pressure transducer, comprising at least partly—in a casing which focuses magnetic field lines M, in particular in the form of an iron casing—a solenoid plunger and a core, in particular in the form of an iron core or magnetic core, wherein the solenoid plunger comprises at least one recess on the side facing towards the core, and/or the core comprises at least one recess on the side facing towards the solenoid plunger, and an air gap is provided between the solenoid plunger and the core; the air gap is adjustable by relative movement between the solenoid plunger and the core, during which relative movement the solenoid plunger can, at least partly, be moved into/out of the first recess in the core, and/or the core can be moved, at least partly, into/out of the recess in the solenoid plunger; the casing comprises at least a first shell and a yoke, each of high magnetic permeability, wherein the first shell is arranged between the solenoid plunger and at least

Abstract: An actuator for an active suspension system includes an armature and a housing enclosing an interior. The interior has a volume that varies in response to movement of the armature. A wall of the housing forms a first aperture through which air passes in response to movement of the armature.

Abstract: Disclosed is an internal weight type vertical vibrator including: a housing; a magnetic circuit unit placed in the internal space of the housing, and comprising a magnet perpendicularly placed and a yoke for fixedly receiving the magnet therein for generating a magnetic field; spring members provided with upper ends fixed to the housing and lower ends fixed to the magnetic circuit unit for vertically; a vibrating unit placed in the yoke so that the outer surface of the vibrating unit is surrounded by the yoke, comprising the weight having a hollow cylindrical structure provided with a central hole, into which the magnet is inserted; and a vibration-generating coil placed just below the magnetic circuit unit so that the vibration-generating coil is interlinked with the magnetic field of the magnet for allowing current supplied from the outside to flow in one direction therethrough.

Abstract: An electromagnetic actuator includes a fixed core supported by a bottom wall of a housing, a movable core arranged opposite to the fixed core via an air gap to drive the movable member, and coil assembly supported by the housing to surround both the cores, wherein the movable member and the movable core are connected by connecting means for adjusting the air gap between the fixed core and the movable core, and wherein an adjustment operating hole through which the connecting means is adjusted is provided on the fixed core so as to be opened outside the bottom wall of the housing. Thus, it is possible to freely adjust the air gap between the fixed core and the movable core without preparing several types of connecting members.

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: An electromagnetic actuator with high performance such as high speed and high resolution is inexpensively provided with solutions to problems associated with power supply and leakage flux, which have been involved in the structure of a moving coil type and have been shortcomings of a VCM type actuator. A composite electromagnetic actuator apparatus employs the foregoing electromagnetic actuator. The electromagnetic actuator is equipped with a stationary assembly that includes two coils disposed coaxially with each other inside a hollow stator yoke composed of a soft magnetic material, and a movable assembly composed of a movable magnet unit and a movable yoke unit both disposed inside the coils with a very small clearance therefrom so as to be movable in the axial direction, wherein the movable assembly travels in the axial direction by the interaction between a magnetic field generated by the movable magnet unit and a current passing through the 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: In order to reduce load supported by a support mechanism for supporting a movable part so as to prevent the movable part from moving in a horizontal direction when stress is generated thereon in the horizontal direction, there is provided a drive unit including a primary side having a magnetic body around which a coil is wound, and a secondary side having a plurality of permanent magnets, the primary side including magnetic poles and step portions provided on the magnetic poles. The width of each step portion is smaller than the width of each permanent magnet.

Abstract: A ring-shaped permanent magnet comprising a Nd—Fe—B magnetic material is integrally insert-molded within a distal part of an inner periphery of a cylindrical supporting member. By employing this structure, a coaxial alignment accuracy of the permanent magnet relative to the supporting member depends on only an accuracy of a die for insert-molding. Accordingly, the coaxial alignment accuracy improves, Moreover, the ring-shaped permanent magnet comprising the Nd—Fe—B magnetic material expands in its radial direction when cooled down, while the supporting member comprising a resin contracts, thus the permanent magnet is firmly held by the supporting member. Indeed, a pore space is not created between a bonded surface of the supporting member and that of the permanent magnet. Therefore, the coaxial alignment accuracy will not go wrong.

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: 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 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 includes tubular outer yoke (4), tubular inner yoke (3) disposed in outer yoke (4), coil (2) provided to inner yoke (3), permanent magnet (5a, 5b) vibrating following a magnetic flux produced by coil (2), and vibrator (6) made of magnetic material and supporting permanent magnets (5a, 5b). Magnetic loop produced by outer yoke (4) and inner yoke (3) travels through vibrator (6) free from interference by vibrator (6) because vibrator (6) is made of magnetic material. As a result, the linear motor vibrates efficiently.

Abstract: An actuator for applying force along an axis to a body, comprising an annular body arranged along the axis, an annular magnetic field source within and substantially coaxially with the annular body, a substantially cylindrical central member arranged substantially coaxially within the annular body in a fixed relationship with a gap formed between the central member and the annular body and an armature comprising a substantially cylindrical hollow member extending at least partially into the gap between the central member and the annular body. The hollow member has first and second spaced coils positioned at either side of the magnetic field source when the armature is at rest, such that the areas of the gap in which the first and second coils are positioned are magnetic flux gaps, and the armature and the annular body are translationally relatively moveable when the first and second coils are energised with opposite currents.

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: An electromagnetic actuator includes a fixed core supported by a bottom wall of a housing, a movable core arranged opposite to the fixed core via an air gap to drive the movable member, and coil assembly supported by the housing to surround both the cores, wherein the movable member and the movable core are connected by connecting means for adjusting the air gap between the fixed core and the movable core, and wherein an adjustment operating hole through which the connecting means is adjusted is provided on the fixed core so as to be opened outside the bottom wall of the housing. Thus, it is possible to freely adjust the air gap between the fixed core and the movable core without preparing several types of connecting members.

Abstract: An electromagnetic actuator with high performance such as high speed and high resolution is inexpensively provided with solutions to problems associated with power supply and leakage flux, which have been involved in the structure of a moving coil type and have been shortcomings of a VCM type actuator. A composite electromagnetic actuator apparatus employs the foregoing electromagnetic actuator. The electromagnetic actuator is equipped with a stationary assembly that includes two coils disposed coaxially with each other inside a hollow stator yoke composed of a soft magnetic material, and a movable assembly composed of a movable magnet unit and a movable yoke unit both disposed inside the coils with a very small clearance therefrom so as to be movable in the axial direction, wherein the movable assembly travels in the axial direction by the interaction between a magnetic field generated by the movable magnet unit and a current passing through the coils.

Abstract: A reciprocating compressor comprises an inside stator formed by piling a plurality of stator cores to have an actinomorphic cylinder shape, which is press-fitted to a frame, and a streak protection member and a burr shielding ring installed between the inner aspect of the inside stator and corresponding outer aspect of the frame. Thereby the burr generating between the frame and the inner stator by a streak is prevented previously, and even if a burr is generated, this burr is locked in a burr escape unit in the burr-shielding ring. Therefore degrading of valve function and an abrasion of a sliding unit in a compressing unit by the burr generating is prevented and the vibration noise of the compressor is reduced by assembling the frame and the inside stator strongly.

Abstract: A stator for a reciprocating motor includes a bobbin made of an insulating material in which a winding coil is located; a terminal unit forming a single body with the bobbin and connecting the winding coil electrically with an outer power source; and a core unit stacked radially along with the bobbin started from one side of the terminal unit. Therefore, the winding coil and the bobbin can be coupled in simple way, and the core unit can be stacked simply and precisely, so the mass productivity of the motor is able to be increased. Also, the size of the core unit is able to be managed simply and precisely, and then, the contact and impact with other components constructing the motor is prevented, whereby the reliability of the motor can be improved.

Abstract: An active balance system is provided for counterbalancing vibrations of an axially reciprocating machine. The balance system includes a support member, a flexure assembly, a counterbalance mass, and a linear motor or an actuator. The support member is configured for attachment to the machine. The flexure assembly includes at least one flat spring having connections along a central portion and an outer peripheral portion. One of the central portion and the outer peripheral portion is fixedly mounted to the support member. The counterbalance mass is fixedly carried by the flexure assembly along another of the central portion and the outer peripheral portion. The linear motor has one of a stator and a mover fixedly mounted to the support member and another of the stator and the mover fixedly mounted to the counterbalance mass. The linear motor is operative to axially reciprocate the counterbalance mass.

Abstract: An outer stator of a motor is mounted in a linear compressor for compressing a coolant gas. The outer stator comprises a coil assembly having a coil wound on a bobbin with flange parts and a plurality of core blocks that surround the coil assembly. The flange parts of the bobbin are provided with bobbin pressers that include protrusions so that the core blocks and the bobbin are pressed by a cylinder block and a back cover mounted in the linear compressor when the outer stator is in the linear compressor. The core blocks and the coil assembly of the outer stator are assembled in the linear compressor while the core blocks and the coil assembly of the outer stator are integrally attached to each other. Consequently, relative movement between the coil assembly and the core blocks is effectively prevented when the linear compressor is operated. Furthermore, shifting of coil wound on the bobbin is effectively prevented.

Abstract: A sliding means with built-in moving-magnet linear motor is provided, realizing high-speed operation and much response ability of a table to a stationary bed, and also accurate position control of the table to the bed. With the sliding means of this invention, armature windings carry a three-phase current while a driving circuit is transferred to the external driver to make the bed slim in construction. Thus, the sliding means is reduced in overall height. A field magnet of rare earth permanent magnet is effective in raising flux density, thereby providing high propulsion for the table. An encoder to monitor a position of the table is an optical encoder having an optical linear scale, which contributes to improvement in accurate monitoring. The construction in which the armature windings connected to cords, lines, and so on are placed on the stator side has no fear of causing dust and dirt, thus realizing clean environment.

Abstract: It is sought to insulate a stator body and lead lines of coils from one another and provide a coil wiring member for a movable magnet type linear motor, which provides for good operability of interconnecting the lead lines and inexpensive in price. In a movable magnet type linear motor comprising a stator having coils and a mover mainly having permanent magnets and movable in the longitudinal direction of the stator, a coil wiring member according to the invention is made of a non-conductive material, has a gutter-like shape open at the top and is fitted in a groove formed in the stator body such as to cover the inner groove surfaces.

Abstract: A solenoid for use in a valve such as an exhaust gas recirculation valve for a motor vehicle. The solenoid includes a housing having a coil for generating a first magnetic field. An armature is slidably mounted in the housing. The solenoid further includes a permanent magnet having a second magnetic field, wherein the magnet is located adjacent the armature. In addition, a stator is affixed in the housing for cooperation with the armature and the magnet to form a third magnetic field.

Abstract: A nail driving gun includes a gun housing, a solenoid mounted in the gun housing and including a coil member and a magnetic core which are magnetically attracted to each other in such a manner that the magnetic core is movable in a frontward direction and the coil member is movable in a rearward direction opposite to the frontward direction when the solenoid is actuated, a striking pin extending from the magnetic core so as to be movable together therewith and so as to expel a nail upon actuation of the solenoid, an urging member for restoring the magnetic core to a normal position, and a shock-absorbing member resiliently abutting against the coil member so as to provide a shock-absorbing effect on the nail driving gun.

Abstract: A voice coil linear actuator comprises: an axially-shaped center yoke formed of a ferromagnetic material; an armature coil concentrically disposed so as to move along the axial direction of the center yoke; and a plurality of ring-shaped permanent magnets which have N and S magnetic poles arranged in the radial direction thereof, and are disposed concentrically as to the armature coil. The armature coil has armature coil units distributed in at least three positions in the axial direction, with adjacent pairs of the armature coil units being arranged so that electric current flows through them in opposite directions, respectively. The permanent magnets are distributed in at least three positions in the axial direction at positions facing respective armature coil units in the radial direction. The respective directions of the N magnetic poles of adjacent permanent magnets are arranged facing in opposite directions.

Abstract: A method for driving a thrust body with a bidirectional linear solenoid drive having at least in each case one first actuator and one second actuator includes the steps of providing the at least one first actuator with at least one coil and a yoke and applying force alternately to the thrust body by interacting the first actuator with at least one armature ring. The armature ring is rotated with the second actuator to thereby axially shift the thrust body by the rotation of the armature ring. The thrust body is, then, shifted axially and is subsequently fixed in position with the thrust body being shifted in steps in this way until it has reached its respective final position. Also provided is a configuration for carrying out the method.

Abstract: An improved hearing prosthetic implant and method of stimulating are disclosed. The method comprises stimulating an electrode array using a set of current stimuli having different geometries, so as to provide a more regular and monotonic set of pitch percepts for a user. In one embodiment, this may be achieved by combining different modes of stimulation for a patient, so that some channels utilise one mode and other channels utilise one or more different modes.

Abstract: A free piston gas compressor comprising a cylinder, a piston reciprocable within the cylinder and a reciprocating linear electric motor derivably coupled to the piston having at least one excitation winding. A measure of the reciprocation time of the piston is obtained, any change in the reciprocation time is detected and the power input to said excitation winding is adjusted in response to any detected change in reciprocation time.

Abstract: A linear motor comprising a stator core and/or a mover. The stator core of said linear motor comprising an inner perimeter, an outer perimeter essentially encircling the inner perimeter, a first and a second tooth being arranged along one of the inner perimeter or the outer perimeter, a slot for receiving a stator coil, said slot being a cavity arranged within the stator core, wherein said stator core is divided into a first stator part and a second stator part, said first stator part including the first tooth, being arranged to partially define the slot, and being made of soft magnetic powder, and said second stator part including the second tooth, being arranged to partially define the slot, and being made of soft magnetic powder.

Abstract: Some of linear motors which constitute an exposure apparatus have coils each obtained by winding a copper foil wire as a foil-like conductor having an insulating layer around a core member in a multilayered structure. The coil is fixed to a positioning portion serving as the coil fixing portion of the linear motor by using the core member. The core member is formed from the same insulating material with low thermal conductivity as that of the positioning portion of a linear motor housing or a material with almost the same linear expansion coefficient.

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: A reciprocating motor includes: an outer stator (4) in a support frame (2); an inner stator (6) disposed at the inner circumferential surface of the outer stator (4) with a certain air gap and mounted at the outer circumferential surface of a cylinder (16); a magnet (10) disposed to be linearly movable between the outer stator (4) and the inner stator (6) driven by the winding coil (8) due to move the piston (18); and the locking unit (30, 32), installed at the lateral face of the inner stator (6) for preventing the inner stator (6) from moving in an axial direction. Therefore, the reciprocating motor can improve reliability of a motor by preventing an inner stator (6) from moving in an axial direction by vibration caused by linear movement of the magnet (10).

Abstract: A permanent magnet synchronous linear motor comprising a field yoke (1) having a plurality of permanent magnets (2) the polarity of which is alternated and which are arranged linearly and an armature (3) facing the array of the permanent magnets (2) through a magnetic air gap, wherein the armature (3) comprises an armature core (4) having main teeth (4b) and slots (4a), an armature winding (5) wound in the slots 4a of the armature core (4), and auxiliary teeth (6) provided at both the ends of the armature core (4). The distance &tgr;p between the centers of the auxiliary teeth (6) and the pitch &tgr;m of the field poles satisfy a relation &tgr;p=(2n−1)×&tgr;m/2 (n is a positive integer) and the length O of the auxiliary teeth (6) is in a relation of O<Hd<Ht where Hd is the length of the auxiliary teeth (6) in the direction orthogonal to the array of permanent magnets and Ht is the length of the main teeth (4b) in the direction orthogonal to the array of permanent magnets.