Abstract: A linear motor armature (1) is constructed by connecting in series a front module (10), at least one intermediate module (20), and a back module (30). The front module includes a first fluid passage, one end of which can be connected to the outside of the armature and the other end of which is open to the back edge (11B) of the front module, and a fifth fluid passage, one end of which can be connected to the outside of the armature and the other end of which is open at the back edge of the front module. The at least one intermediate module includes a second fluid passage, one end of which is open at the front edge (21A) of the intermediate module and the other end of which is open at the back edge (21B) of the intermediate module, and a fourth fluid passage, one end of which is open at the front edge of the intermediate module and the other end of which is open at the back edge of the intermediate module.

Abstract: The present invention relates to an integrated system in which a bilateral permanent magnet excited synchronous motor part and a non-contact power feeding part are combined in order to generate a linear driving force and to feed an electric power without any contact.

Abstract: The present invention provides an electromagnetic actuator wherein an electromagnetic driving force for a movable component fixed to a driven member is continuously controlled by a control coil installed in a fixed component, the movable component is light weighted and a high fabricating accuracy of the actuator is not required. The electromagnetic actuator comprises a movable magnet of the movable component and a fixed magnet of the fixed component, and the control coil is installed between the first magnetic pole of the movable magnet and the first magnetic pole of the fixed magnet. And the movable magnet of the movable component is controlled by a totalized electromagnetic force wherein the totalized electromagnetic force is a sum of an electromagnetic repulsive force by the fixed magnet and an electromagnetic controlling force by the control coil of the fixed component.

Abstract: A linear motor includes a rotor (70) and a secondary member (80), wherein the secondary member (80) carries a cover for protection against mechanical damage, aggressive liquids etc. The cover (40) has low magnetizable material and is held in place by magnetic elements (30) of the secondary member. Thus, there is no need to secure the cover additionally by gluing etc and the cover can be easily replaced. The cover can be placed, preferably, as one piece upon the secondary member, which may be made of several secondary member elements, and carries a scale for controlling the position of the motor.

Abstract: A pulse signal generator comprises a magnetic element (1) capable of producing large Barkhausen jumps; a generating unit for generating a magnetic field, which is changed by the object to be detected (5) to cause the magnetic element to produce the large Barkhausen jumps; the generating unit consists of a pair of elongated magnet/yoke combinations (3,6 and 4,7) provided on opposite sides of the magnetic element (1) such that their poles are oriented in opposite directions, forming a detecting area at an end thereof (3A, 4A); a detecting unit (2) for detecting the large Barkhausen jumps to produce a corresponding pulse signal; the magnetic element (1) having a first length between a second length of the magnet/yoke combinations and a half of the second length and provided toward the detecting area; and an adjusting yoke (8) movable along one of the elongated magnet/yoke combinations (3, 6).

Abstract: A linear actuator includes a supporting unit with a stopper, a linear output unit, a movable unit, a magnetic flux generating unit and a control unit. The movable unit is connected to a stopper of the outer pipe at one end of the outer movable unit and to the linear output unit at the other end. The magnetic flux generating unit generates first magnetic fluxes. The movable unit has elasticity, and expands or contracts based on action of the first magnetic fluxes and the elasticity. The linear output unit linearly moves in response to the expansion or contraction of the movable unit.

Abstract: A data handling system having a voice coil motor having a first magnetically permeable plate and a second magnetically permeable plate is disclosed. The first magnetically permeable plate is coupled to a permanent magnet pair and the second magnetically permeable plate includes a raised plate portion directly opposite the permanent magnet pair. Planar surfaces of the permanent magnet pair and the raised plate portion are substantially parallel to each other and are spaced by an air gap. A voice coil is positioned in the air gap and moves in response to a magnetic interaction between a magnetic field produced by a controlled current through the coil and a magnetic field between the permanent magnet pair and the raised plate portion. The planar surfaces of the permanent magnet pair and the raised plate portion may be substantially identical in shape and surface area.

Abstract: A motor which has an improved energy efficiency, is excellent in practical use and has a generator function at the same time. The motor is provided with a basic factor 15 having working surfaces 55a and 55c on both sides thereof, respectively, and movable members 57 made of a magnetic material and arranged opposite to the working surfaces, respectively. Further, the basic factor 15 is provided with an electromagnet element 17 and permanent magnets 19 arranged on both sides thereof through contact surfaces, respectively, and the working surfaces and the contact surfaces are held opposite to each other through the permanent magnets 19, respectively.

Abstract: The invention relates to a linear motor for a linear drive mechanism of a magnetic levitation transport system. Said linear motor comprises a plurality of inductor supports (15) which are arranged in a row and which have grooves (14) crosswise to the longitudinal direction, said grooves being substantially equal distances apart from each other; and at least three linear motor lines (1, 2, 3), which are wound into windings (16) in a meandering shape and which are located in the grooves (14) in sections. Said coils (16) have winding heads (16.1, 16.2, 16.3) situated a distance (A) apart. The invention solves the technical problem of producing the windings continuously and economically by providing that the lengths (A′) of the winding heads (16.1′, 16.2′, 16.3′) of the of the at least three linear motor lines (1, 2, 3) are extended at a point of discontinuity (100) between two adjacent inductor supports (15).

Abstract: A magnetic sleeve assembly for use in a linear compressor motor, including a support sleeve and a plurality of magnets attached to the support sleeve by mounting rings. The mounting rings have angled lips extending over and contacting the ends of the magnets, which have beveled bearing surfaces on their ends. As the assembly expands and contracts, the mounting rings maintain the magnets in place.

Abstract: An electromagnetic x-y stage driver for a nano data storage system and a method for fabricating the coils of the same are provided. In the electromagnetic x-y stage driver, a cantilever tip array fixedly provided a medium for recording data to write data to or read data from each cell of the medium. Four coils are formed to be integrated with the medium in front of, behind, to the left of and to the right of the medium to move the medium. Four supporting beam are installed to an x-y stage body onto which a medium structure composed of the medium and the four coils is loaded such that the four supporting beam are connected to the four corners of the medium structure to support the medium structure. Four driving beams connect the upper portions of the supporting beam to the four corners of the medium structure to allow the medium structure to move in an x or y direction. Stiffeners are disposed at the four sides between the supporting beam to prevent the medium structure from rotating.

Abstract: Positioning device with a first part and a second part which are movable relative to each other in at least one direction. Said first part comprises a carrier on which a system of magnets with N and Z magnets are arranged in an alternating manner and having a flux density B(x)=B(x+2&tgr;), &tgr; being the magnetic pole pitch. Said second part comprises an electric coil system with at least one coil block unit, each unit having k coil blocks with k]2, said coil blocks having conductors, all conductors belonging to the same coil block being oriented in the same direction and fed by a n-phase system with n]2.

Abstract: An electromagnetic device includes a core and a coil in the space between a central section and an outer section of the core and spaced inwardly of an open side of the core such that the coil is completely recessed within the core. An armature, facing and aligned with the recess in the core is being movable towards and away from the coil. A pair of springs on the opposite ends of the core, and coaxial with the longitudinal axis of the core, mount the armature for straight-line reciprocatory movements parallel to the longitudinal axis of the core such that during the movement of the armature: (a) a recess in the armature receives the central section of the core; (b) the outer surface of the armature defines a first working gap with the inner surface of the core outer section; (c) and the inner surface of the armature at the recess defines a second working gap with the outer surface of the core central section.

Abstract: A linear actuator incorporates a DC motor whose stator is secured to a frame. A shaft is coupled to the rotor of the DC motor one end of which is circumferentially coupled to the inside of a torsion spring and the outer section of the torsion spring is coupled to the frame. The center section of the shaft is circumferentially raised creating first and second shaft stops. The middle of the shaft is threaded and threadedly coupled to a translating actuator which has a radial raised portion which engages a section of the frame. The radial raised section provides a radial stop and prevents the translating actuator from rotating. Additional radial raised portions on the translating actuator create first and second stops that engage the first and second shaft stops at each extreme of travel. The first stop keeps the threads from binding in a retracted position and the second stop keeps the threads from binding in the extended position.

Abstract: Described herein is a multi-phase transverse flux machine, which comprises a stator with essentially U-shaped and I-shaped cores (1, 2) of a soft-magnetic material and respectively one stator winding (3) for each phase that generates a magnetic flux in these cores, as well as a rotor with circular magnetic return path (4). The phases of the stator are magnetically separated. The rotor contains electrically conductive material (5, 6) in each of the phases, wherein the electrically conductive material of at least two phases is arranged and is interconnected in the rotor, such that if an alternating current flows through the stator windings of these phases, a current generating a starting torque for the rotor is induced in the electrically conductive material. The at least two phases thus electrically form a rotating magnetic field machine in the rotor.

Abstract: A linear motor armature (1) is constructed by connecting in series a front module (10), at least one intermediate module (20), and a back module (30). The front module includes a first fluid passage, one end of which can be connected to the outside of the armature and the other end of which is open to the back edge (11B) of the front module, and a fifth fluid passage, one end of which can be connected to the outside of the armature and the other end of which is open at the back edge of the front module. The at least one intermediate module includes a second fluid passage, one end of which is open at the front edge (21A) of the intermediate module and the other end of which is open at the back edge (21B) of the intermediate module, and a fourth fluid passage, one end of which is open at the front edge of the intermediate module and the other end of which is open at the back edge of the intermediate module.

Abstract: In a preferred embodiment, a linear/rotary motor, including: a housing; an output shaft extending from the housing; a rotary motor disposed within the housing, the output shaft being given rotational motion by the rotary motor; a linear motor disposed within the housing; a linear shaft axially moveable by the linear motor; and a coupling to join the linear shaft and the output shaft to permit transfer of axial motion from the linear shaft to the output shaft but to isolate rotational motion of the output shaft from the linear shaft.

Abstract: Disclosed a slider unit having built-in a moving-coil linear motor made compact in construction by the provision of an improved magnet yoke for supporting field magnets, which is made in a slim construction, nevertheless very high in stiffness. The magnet yoke is comprised of a pair of confronting webs and a connecting web to connect integrally the confronting webs to each other. The magnet yoke of such integral construction helps ensure the overall high stiffness despite the webs being made thin. Thus, the magnet yoke may be made considerably slim, compared with the prior magnet yoke in which the confronting webs and connecting web are produced individually. A moving-coil assembly is installed to a table movable in a sliding manner through linear motion guide units with respect to a stationary bed.

Abstract: A slider unit having built in a moving-coil linear motor is incorporated in a linear motion guide unit having a track rail and a slide. The slider unit is made easy in mounting to the appliances or works. The linear motion guide unit has the track rail and the slider movable lengthwise of the track rail. A linear motor is arranged between any one of widthwise opposing side walls of the track rail and the slider, and composed of a stator comprising a magnet yoke and field magnets, and a moving-coil assembly held on a side edge of a mount of the slider. The linear motor is preferred to make compact or slim in construction the linear motion guide unit, in which the linear motor is incorporated, thus making the slider unit simple in construction.

Abstract: A disk drive with steering magnets that reduce the magnetic flux leakage from the actuator magnets of a linear actuator is disclosed. The steering magnets reduce flux leakage in the area of the magnetic disk where magnetic information is read and record, thereby enabling disk drive size to be reduces. The steering magnets are arranged along the sides of the outer return path. Like poles of the steering magnets face inward toward like poles of the actuator magnets.

Abstract: An electronic device has a shell with an interior, an exterior and a resonant frequency of, for example, 100 Hz. A transducer located in the interior of the shell is operatively coupled to control circuitry. The control circuitry is capable of sending a low frequency audio signal to the transducer which utilizes an electromagnetic force as a source of vibration excitation to cause the shell to vibrate around the resonant frequency of the shell. A low frequency sound is produced by the vibration of the shell.

Abstract: A propulsion system for a magnetically levitated vehicle is described. The propulsion system includes a drive and/or suspension magnet arrangement mounted in the vehicle, its drive magnets and/or suspension magnets being arranged with their magnetic axes that connect the two magnet poles running across the longitudinal direction of the guideway so that the magnet poles arranged in succession in this longitudinal direction have the same polarity.

Abstract: A motor combination (10) for enclosing and moving a stage (28) (30) for an exposure apparatus (32) is provided herein. The motor combination (10) includes a motor (12) and a chamber (14). The motor (12) has a first component (16) and a second component (18). One of the components (16) (18) includes a magnet array (36) having at least one magnet (42) and the other component (16) (18) includes a conductor array (38) having at least one conductor (44). The chamber (14) encircles and encloses one of the stages (28) (30) and the second component (18) of the motor (12). Importantly, the chamber (14) includes a wall (20) that is interposed between the first component (16) and the second component (18) and the motor (12) is magnetically coupled through the wall (20) of the chamber (14). With this design, the object (22) is enclosed by the chamber (14) and any reaction forces of the motor (12) can be easily transferred to a ground (24) or a reaction mass (26).

Abstract: Sealed telescoping tubes are electromagnetically and fluidly actuated to provide linear motion and withstand loading. One of the tubes may be connected to a pressure or vacuum source, and the other sealed to a fixture to provide variable volume load augmentation in addition to electromagnetic actuation. Alternatively, both tubes may be sealed to provide a pneumatic or hydraulic spring with electromagnetic actuation, and the sealed tubes may also be connected to a pressure or vacuum source for load augmentation. A bearing may be used in conjunction with the seal between the tubes to provide resistance to traversal loads. The electromagnetic actuation includes a helical arrangement of coils or permanent magnets to provide linear motion or resistance. The coils can be arranged to be connected to a conventional multi-phase motor drive.

Abstract: A drive system for transferring a work load suspended from a hoist from one work processing stage to another in a series of stages. Included in the system is an X-linear motor which causes the hoist to travel along a horizontal path running from stage to stage, and a Y-linear motor causing the hoist, when at a selected stage, to travel in a vertical path to lower the work load into the stage for processing and then raise the load so that it can travel to another stage. Power for the X-motor is supplied by an external source, but power for the Y-motor which is electromagnetically coupled to the X-motor is inductively derived from the X-motor, thereby obviating the need for a power cable for the Y-motor.

Abstract: A positioning apparatus positions a movable body 6 on which a wafer W (object to be positioned) is mounted, and includes; a magnetism generation body 8 incorporated in the movable body 6, a magnetic member 10, 15A, 15B, 16 formed so as to have the magnetism generation body 8 therebetween, and a drive unit 11 disposed between the magnetism generation body 8 and the magnetic member 10, for driving the magnetism generation body 8, and the movable body 6 is positioned by means of the magnetic member 10 etc. and the drive unit 11. The positioning apparatus can position a movable body (object to be positioned) at a high speed and with high precision, and is suitable for use for example with an exposure apparatus or the like for positioning a wafer at high precision.

Abstract: A coil apparatus for a linear-motor railway system comprises six superconductive coils mounted on a bogie of a vehicle at a predetermined pitch such that N and S poles are alternately formed; ground coils disposed on either side wall of a guide, each of the ground coils providing propulsion, levitation, and guide functions, and each set of three ground coils corresponding to a pair of adjacent superconductive coils that form N and S poles; and a feeder circuit connected to the ground coils. The coil apparatus can decrease the number of ground coils in order to decrease man-hour required for installation, and to facilitate inspection and maintenance of contact points through reduction in the number of the connection points.

Abstract: A sheet transport system for a rotary printing press, including a sheet transport device having a sheet holder, and a first and a second propulsive drive element for propulsively driving the sheet transport device guidingly in a first and a second guide rail, respectively, the second guide rail extending substantially parallel to the first guide rail, the first and the second propulsive drive elements forming rotors of an electric linear drive, the first and the second guide rails having a plurality of drive stations disposed thereon and forming a stator of the linear drive, and a control device assigned to the drive stations for controlling and regulating movement of the first and the second propulsive drive elements, each of the first and second propulsive drive elements being a structure formed of magnetizable material, at least part of which is movable relative to another part thereof, and the drive stations being spaced from one another, at least in some sections of the sheet transport device, a distance

Abstract: Linear motor includes a moving member tapered relative to a traveling direction to provide a surface slanted relative to the traveling direction toward one end of the moving member, a stator having a surface that is opposed to the slanted surface of the first member and slanted relative to the traveling direction at an angle corresponding to the slanted angle of the slanted surface of the moving member, a field pole producing section for producing field poles on the slanted surface of the moving member, and an armature section provided on the stator and including armature windings so as to produce electromagnetic poles corresponding to electric currents passed through the armature windings. Thus, the moving member is caused to move relative to the stator, by exciting the armature windings to produce a linearly moving magnetic field.

Abstract: An electrical generator has at least one rotating ring of field magnets which produce a circular array of magnetic fields, and a ring of generator output coils which are in the magnetic fields. The field magnets are permanent magnets or electromagnets. The generator output coils are movable in a displacement path toward and away from a null position at which they are exposed to zero net flux from the magnetic fields. Movement of the coils by an actuator varies the amplitude of the voltage induced in these coils by the rotating field magnets. The actuator is energized by an alternating current to create a mechanical oscillation of the generator output coils in their displacement path. The coils provide a raw amplitude-modulated signal that has a carrier frequency which is a function of the rotational velocity of the field magnets and a modulation frequency that is proportional to the mechanical oscillation of the generator output coils.

Abstract: A voice coil motor capable of quickly and precisely positioning a magnetic head with high precision is provided with a bearing rotatably supporting a head carriage without being influenced by a radial load. Two coils having radial sections contributing to generate a torque are provided to be rotatable in a magnetic space formed by a permanent magnet and a pair of yokes, and are layered along a central rotating axis in such a manner that an extension angle of the radial sections of one coil differs in direction from that of the radial sections of the other coil. When electric current flows, no radial load works, and a resultant force generated in these coils can be a couple of forces in the direction vertical to the movement direction of the magnetic head, so that the magnetic head can be quickly positioned with high precision, realizing a small magnetic disk device.

Abstract: A compressor integrated pulse tube refrigerator of an oil free type is disclosed. The refrigerator includes a driving unit including a sealed casing having a cylinder disposed at an upper center portion of the same and a working gas filled therein, a linear motor installed in the interior of the sealed casing for generating a driving force, a driving shaft which is engaged to a rotor of the linear motor and linearly reciprocates, a piston connected with the driving shaft and inserted in the cylinder and reciprocating together with the driving shaft for thereby pumping a working gas, and a plurality of elastic guide support members provided in the interior of the sealed casing; and a refrigerating unit, for thereby implementing a stable reciprocating movement between a cylinder and a piston in a state that an outer surface of the piston does not contact with an inner surface of the cylinder.

Abstract: An electrical machine structure includes a plurality of magnetic circuit units, each including at least two magnetic poles interconnected by a magnetic circuit structure. The magnetic circuit units are stacked or intercrossed in such a way that ventilation openings are formed between the magnetic circuit units. Clearances between the magnetic poles and an interactive electrical machine structure or rotor are arranged to vary asymmetrically across the lengths of the poles to provide a more uniform flux distribution. The use of relatively small magnetic circuit units arranged to form ventilation openings, and the manner in which the clearance between the magnetic poles is varied, enables the use of smaller pole structures than is possible with a conventional more integral magnetic circuit structure.

Abstract: A linear motor supplying a nearly constant force along its entire length is presented. The linear motor includes two parallel magnet arrays having magnet strips of alternating magnetic polarity positioned along the length of the motor. A three-phase commutation coil is attached to a center pole such that individual coils are wrapped around the center pole. In some embodiments, the center pole runs the length of the motor and the three-phase commutation coil slides on the center pole. In other embodiments, the center pole is attached to the coils. The three-phase commutation coil includes any number of sets of three coils, each coil in the set carrying one of the three phases of current. A driver supplies three phases of current to the three-phase commutation coil in response to the position of the three-phase commutation coil relative to the magnet arrays.

Abstract: An electromagnetic drive for a focal-plane shutter of a camera having two light-excluding shutter curtains, each of the two shutter curtains being having its own electric drive motor, which is a linear motor constructed from permanent magnets and electromagnetic coils. The linear motor has at least two mutually aligned permanent magnets. The opposite pole faces of the magnets have the same polarity. A soft-magnetic disk is disposed between the permanent magnets. A soft-iron casing encloses the magnets and the soft-magnetic disk with an annular gap therebetween. A coil former is displaceably mounted in the annular gap such that it can exert an operating stroke between two stops. The coil former has a drive element for transferring the axial displacement of the coil former to the assigned shutter curtain.

Abstract: A permanent magnet for an actuator motor of a disk drive is provided herein. The permanent magnet includes an arch shaped magnet body which is made of a magnet powder. The magnet body including a first segment and a second segment which are substantially side by side. Each segment has a north pole and a spaced apart south pole. Each segment includes a first region having a first region axis which extends between the north pole and the south pole and a second region which encircles the first region. Importantly, the magnet powder is aligned during manufacturing to form a powder pattern having first region powder lines in the first region which are substantially parallel with the first region axis and second region powder lines in the second region which are angled relative to the first region axis.

Abstract: The invention includes a two-dimensional electric motor having two arrays of permanent magnets and at least two coils. The arrays of permanent magnets each have north and south poles distributed in both longitudinal and latitudinal directions along a plane. North poles in the first array are aligned with south poles in the second array, and south poles in the first array are aligned with north poles in the second array. The coil has a portion between the two arrays of permanent magnets. In another embodiment, the two-dimensional electric motor has an array of permanent magnets and two sets of two coils. The two sets of two coils are positioned on two different sides of the array. The invention permits simpler control methods, more stable motion, increased efficiency, and reduced stray magnetic fields. The invention should be particularly useful in semiconductor processing equipment.

Abstract: A linear compressor motor comprising a piston assembly (2) and a cylinder assembly (3) mounted together for relative axial movement along an axis (1) by a pair of spiral springs (16, 17). The piston assembly (2) includes a piston (6) and the cylinder assembly (3) including a cylinder (4), there being a low clearance between the cylinder and the piston to enable a pumping action to be achieved without seals. Mounted on the exterior of the cylinder (4) is a magnet (13) and associated polepiece (14). Forming part of the cylinder assembly (3) is a cylindrical housing (11) in which the cylinder itself is mounted by means of a radially-extending flange (12). The coil for interaction with the magnet is positioned in an annular air gap between the polepiece (14) and the housing (II). The coil is wound on a coil holder (8) which is itself mounted on the piston (6) by way of a radially-extending flange (7).

Abstract: A molding machine includes a drive unit for linearly moving a movable body, such as a movable platen of a clamping apparatus. The drive unit includes a linear motor. The linear motor includes a linear movement body having moving-side magnetic-pole portions and supported in an axially movable manner, and a stationary body having stationary-side magnetic-pole portions adapted to linearly move the linear movement body. The linear movement body is connected to the movable body (movable platen). The linear movement body has moving-side inclined surfaces on which part of the moving-side magnetic-pole portions are disposed. The stationary body has stationary-side inclined surfaces which face the moving-side inclined surfaces and on which part of the stationary-side magnetic-pole portions are disposed.

Abstract: A linear actuator includes a plurality of magnetic plates and a ferrite core with a conductive cover which are mounted on the actuator body to generate a permanent magnetic field. The linear actuator also includes a metal bobbin which has an outer surface and which is formed with an aperture that defines an inner surface for the bobbin. Further, the bobbin is formed with a gap which extends along its length and which intersects the bobbin from its inner to its outer surface. An insulating insert is placed in the gap. Finally, a winding is wrapped around the outer surface of the bobbin to form an electromagnetic coil, and the coil on the bobbin is slidingly mounted on the actuator to receive the ferrite core through the bobbin's aperture. Electrical current can then be selectively applied to the winding to interact with the permanent magnetic field and thereby cause reciprocating motion of the coil.

Abstract: A linear motor comprising a first portion having: a primary magnetic circuit comprising N.sub.e slots alternating with N.sub.d teeth, with N.sub.e =N.sub.d, a multiphase electrical winding having 2P poles being placed inside said slots and, at an instant t when fed with AC, producing an undulated magnetic field of length l and of P periods along the length l of the magnetic circuit covering the N.sub.e slots and the N.sub.d teeth; and a second portion, disposed facing the first portion and separated therefrom by a plane air gap, said second portion having a length L=l+x, where x is the length of relative displacement between the two portions relative to each other, said second portion constituting a secondary magnetic circuit; wherein, facing said air gap, said secondary magnetic circuit comprises a series of teeth and slots along its entire length L, wherein said first portion comprises, along said air gap, and fixed to the primary magnetic circuit at the end of its teeth and its slots, a series of 2N.sub.

Abstract: An actuator made up of a plurality of actuator elements is provided which actuator provides long travel in one dimension and short travel in five additional dimensions, with each actuator element providing long travel in the one dimension and short travel in at least two additional dimensions. For preferred embodiments, each actuator element includes a suspension core, the long travel being in one linear dimension and each actuator element providing short travel in two additional linear dimensions and at least one rotary dimension.

Abstract: A positioning device is disclosed. The positioning device has a first part and a second part, the second part further has an object table. The second part may be displaced relative to the first part parallel to the XY-plane and may be rotated about the Z-axis by means of three motors. The motors are Lorentz type motors having a permanent magnet system and an electrical coil system cooperating therewith. The electrical coil systems each have windings which are substantially directed parallel to a main axis of the electrical coil system and perpendicular to the Z-axis. According to the invention, the main axis of each of the three motors encloses an angle of substantially 120.degree. with the main axis of each of the two other motors.

Abstract: A molding machine includes a drive unit for rotating and linearly moving a movable body. The drive unit includes a linear motor and a rotary motor. The linear motor includes a linear movement body having moving-side magnetic-pole portions and supported in an axially movable manner and a stationary body having stationary-side magnetic-pole portions adapted to linearly move the linear movement body. The linear movement body has moving-side inclined surfaces on which part of the moving-side magnetic-pole portions are disposed. The stationary body has stationary-side inclined surfaces which face the moving-side inclined surfaces and on which part of the stationary-side magnetic-pole portions are disposed. The rotary motor is incorporated into the linear movement body and is adapted to rotate an output shaft connected to the movable body.

Abstract: A method for manufacturing a linear voice coil actuator, capable of continuously generating a one hundred kilogram force with less than two amperes of current, requires using a coil for generating an electrical field and an unsaturated permanent magnet circuit for generating a magnetic field. In the method of manufacture, a flat surface of the electrical coil is positioned parallel to a flat surface of the magnet to establish a gap therebetween. Before operating the actuator, when no current is running through the coil, a distance of approximately 0.75 mm is established across the gap. Subsequently, during operation of the actuator, when a current of less than approximately two amperes is driven through the coil, the electrical field generated by the coil interacts with the magnetic field of the magnet to generate as much as a 100 kg force on the coil.

Abstract: An X-Y positioning machine has a forcer, with armature coils, that moves around on a platen, supported by an air bearing. Magnets embedded in the motor platen generate a fixed magnetic field with which the armature coils interact. Perpendicular elongated coils interact with the fields of magnets in columns and rows. When a traditional rectangular pattern of the magnets is provided, a packing density and average peak magnetic flux intercepted by the coils are limited to 50%. The present invention provides magnet configurations that provide greater than 50% maximum peak flux density and up to 100% packing density. Several magnet arrangements are provided: a first in which round magnets are used instead of square, and a second in which diamond shaped magnets are used. The latter can be used at 100% packing density arrangement. In addition to high peak flux density for a narrow coil, these embodiments exhibit low cogging forces. A method of making the magnet is also provided.

Abstract: The invention concerns a spindle motor, comprising a stationary base flange that supports a central spindle, a hub that is positioned pivoting on the spindle with the aid of suitable bearings and on which at least on fixed-memory disc is arranged, wherein the hub has a rotor magnet on the inside circumference, and comprising a stator-side winding packet, which is arranged at the base flange and is positioned opposite the rotor magnet, wherein the winding packet is extrusion-coated completely with an elastic mass and is thereby connected to the base flange.

Abstract: A voice coil motor actuator for a magnetic disk device includes a pivot bearing shaft, a positioner, a magnet, and a coil. The positioner is pivotally supported by the pivot bearing shaft. The positioner has a distal end portion at which a magnetic head is mounted, and a proximal end portion projecting to a side opposite to the distal end portion with respect to the pivot bearing shaft. The magnet is fixed in correspondence with the pivot range of the proximal end portion of the positioner. The coil is arranged at the proximal end portion of the positioner to oppose the magnet. The coil has a pair of effective length portions which generate a magnetic flux to act on the magnet upon energization, thereby applying a pivot force to the positioner. The position of an intersection between the extended lines of the effective length portions of the coil is set between the pivot bearing shaft and the coil.

Abstract: An electromagnetic actuator includes an actuator rod having a plurality of magnetic assemblies disposed about a longitudinal axis of the actuator rod. Each plurality of magnetic assemblies develops alternating magnetic flux along the longitudinal axis. The electromagnetic actuator further includes a plurality of stator windings secured to a support structure and disposed about the longitudinal axis. Each stator winding has a pole facing a portion of one of the plurality of magnetic assemblies and the longitudinal axis.

Abstract: A single linear motor has two sets of active sides with windings, secondaries and backirons. The front of the motor drives one load and the rear of the motor selectively drives another load. The windings on the two sides may have their phases reversed so as to drive the load in opposite directions in response to the same three-phase, U, V, W drive signals; or, only one load need be drive at any one time. The loads may be double, center-opening or two-speed elevator doors.