Abstract: An electromagnetic energy transducer comprising a permanent magnet (1), a soft-magnetic element (9), an electrical coil (6), and stop points (8a-8d). The electrical coil surrounds a part of the magnetic circuit, wherein the permanent magnet (1) and said soft-magnetic element (9) are arranged to form a magnetic circuit with a first flux direction. At least one of the soft-magnetic element (9) and the permanent magnet (1) is mounted for rotary movement about an axis (4) with respect to the other. End points of the rotary movement are formed by the stop points (8a-8d).

Abstract: Disclosed is a motor fixing structure of a reciprocating compressor comprising: a front frame having a predetermined shape; a middle frame positioned with a certain interval from the front frame; an outer stator positioned between the front frame and the middle frame so that an inner stator can be positioned with a certain interval therein; a coupling means for fixing the outer stator positioned between the front frame and the middle frame by coupling the front frame and the middle frame to each other; and a sliding preventing means installed between the outer stator and the front frame contacting each other and/or between the outer stator and the middle frame contacting each other for preventing sliding. According to this, a motor assembly is simplified, and abrasion and damage of components are prevented by preventing a motor assembly dimension variation during driving.

Abstract: A linear motor not requiring a yoke structure is provided. A first unit forming a stator is constructed of two permanent magnet rods. The permanent magnet rods each have a magnetically permeable shaft and a permanent magnet row having a plurality of permanent magnets so arranged that opposite polarities of their magnetic poles alternately appear. The permanent magnet row of the permanent magnet rod is arranged with a positional difference of 180° in an electrical angle from the permanent magnet row of the permanent magnet rod. The second unit that constitutes a moving member includes unit cores and winding sets arranged alternately in an axial direction of the shaft. The winding set includes two excitation windings through each of which the permanent magnet rod loosely extends. One excitation winding of the winding set is excited with a phase difference of 180° in an electrical angle from the other excitation winding.

Abstract: A method to operate a motor having 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. The method includes the steps of 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, or vice versa.

Abstract: A reciprocating compressor includes a front frame; a middle frame positioned with an interval from the front frame; an outer stator having a winding coil and coupled between the front frame and the middle frame; a cylinder coupled to the front frame; a magnet mounting inner stator having a protruded pole portion at both ends thereof and linear-movably inserted into the outer stator; a magnet mounted at an outer circumferential surface of the magnet mounting inner stator; a piston inserted into the cylinder; a connection unit for connecting the piston and the magnet mounting inner stator; a resonance spring unit for resonating the piston and the magnet mounting inner stator; and a valve assembly for opening and closing a gas flow path so that gas can be sucked into the cylinder and compressed as the piston is linearly-reciprocated. According, the amount of the expensive magnet used is reduced, an output of a driving motor is enhanced, and components are simplified.

Abstract: An object of the present invention is to provide a linear actuator in which reliability is improved, and performance is also easily improved. The present invention provides a linear actuator including a stator, a movable element having an iron member, and being reciprocatable with respect to the stator, a permanent magnet fixed to the stator so as to be opposed to the iron member, and a coil fixed to the stator. Because both the coil and the permanent magnet are fixed to the stator, electrical current does not have to be supplied to the movable element, and the feeder lines connected to the coil will not be broken due to the movement of the movable element. In addition, the weight of the movable element will not be increased even when the weigh of the permanent magnet is increased in order to obtain high magnetic flux density for improvement in performance. Moreover, because the movable element does not include a magnet, a magnetizing operation does not have to be applied to the movable element.

Abstract: A magnetic gear device for converting a rotary force to a linear force, the device comprising a rotary assembly for accepting a rotary force, a linear assembly for accepting a linear force, and a magnet assembly linked to the rotary assembly sand the linear assembly for converting the rotary force to a linear force.

Abstract: A positioning apparatus including a movable member having a plurality of magnets, and a plurality of coils arranged in X- and Y-axial directions, for displacing the movable member in the X- and Y-axial directions, and in a rotational direction around the Z-axis.

Abstract: The motor includes an E-core stator assembly with a source of alternating current and an armature portion mounted to be responsive to the stator to oscillate back and forth through an arc portion of the personal care appliance and flexure elements are connected between the armature and the mounting member, the flexure elements crossing each other, wherein the crossing point defines a pivot point about which the armature rotates. A workpiece assembly, which includes a mounting arm, is configured so that a skin brush mounted on a free end of the mounting arm has an axis of rotation about the pivot point.

Abstract: Methods and apparatus for increasing the efficiency of a voice coil motor (VCM) are disclosed. According to one aspect of the present invention, a cylindrical and radially symmetric VCM includes a plurality of sets of magnets, and a single coil. The plurality of sets of the magnets are each arranged in an array configuration, and cooperate to form a magnetic field. The coil receives current and has a plurality of windings. A first space is defined within the coil, and the plurality of sets of the magnets are arranged such that a first set of the magnets is positioned within the first space and a second set of the magnets is positioned external to the coil.

Abstract: A moving coil electrical generator includes a hollow passageway of predetermined configuration and length, at least one permanent magnet supported in a position which extends its magnetic flux through empty space within the passageway, at least one electrically conductive coil placed within and configured to physically move through the passageway, at least two separate pairs of contacts on the coil and the passageway which remain in substantial physical contact and electrical continuity with each other as the coil moves through the passageway, whereby electrical voltage and current are generated in the coil as it moves through and intersects the magnetic flux within the passageway. The generator can be isolated with metallic shielding to prevent or minimize outward magnetic leakage.

Abstract: An electromagnetic motor includes a permanent magnet connected to a piston component of the motor and defining a linear reciprocating displacement path; and two electromagnets connected to the cylinder housing that periodically and alternately interact with the permanent magnet. The electromagnets are electrically connected to a power source for their selective activation. The electromagnets magnetically attract the permanent magnet over a respective first portion of the displacement path when un-activated and magnetically repulse the permanent magnet over a respective second portion of the displacement path when momentarily activated by the power source.

Abstract: An exemplary description provided for patent searches includes a linear electrodynamic system for conversion of mechanical motion into electrical power or conversion of electrical power into mechanical motion involving advantageous use of magnetic material positioned on a mover. Bore surfaces of the magnetic material is shape complementary to bore surfaces of stator poles. Some implementations utilize non-annularly shaped bore surfaces while others utilize annularly shaped bore surfaces.

Abstract: A tactile wave generating apparatus and method to generate amplified low frequency waves which are then transmitted as tactile waves into a structure and/or to a persons anatomy. There is a housing in which is positioned a drive section that in turn comprises a magnet section that moves upwardly and downwardly as an inertial mass, two coils on opposite sides of the magnet and two flux path return plates for the coils. Each coil comprises upper and lower longitudinally aligned generally linear coil portions which drive the magnet section upwardly and downwardly. The magnet section is supported by upper and lower interconnecting sections that resiliently resist the up and down motion of the magnet section and restrain the magnet section to move up and down within close tolerances.

Abstract: A linear compressor comprises an external casing forming a compressing chamber, an outer core disposed in the external casing, an inner core assembly disposed inside of the outer core interacting with the outer core, and wherein the inner core assembly comprises an inner core, an upper cover combined to an upper part of the inner core, and a bottom supporting part combined to a bottom part of the inner core. With this configuration, the linear compressor provides a capability of simplifying an inner core assembly, thereby reducing the manufacturing cost.

Abstract: The vibrating device (1) is mounted in a portable object, such as a wristwatch, to act in particular as a silent alarm. The device includes a moving mass (3a, 3b, 6, 15) formed in part by a magnetic structure connected to a fixed structure (5) via a spring element (4), and a coil (2) connected to the fixed structure without any mechanical contact with the moving mass. The coil is electro-magnetically coupled to the moving mass to enable it to oscillate in at least one direction of oscillation (X) when it is being powered by alternating electrical signals at a determined frequency. A fixed part of the vibrating device includes a part (4d) forming part of the spring element, which is mounted on the fixed structure. This part includes a longitudinal aperture (14) in the direction of oscillation combined with a surface of the fixed structure to define guide means in which a projecting element (16) of the moving mass is placed.

Abstract: According to the invention, configurations of X-windings and Y-windings in a synchronous permanent planar motor are improved, X-windings and Y-windings overlap in the direction normal to the planar magnet array and distribute on the entire surface of the thrust core, such that effective wires in the X-windings and Y-windings are lengthened and increased in number, therefore the electromagnetic force generated by the SPMPM of this invention is increased correspondingly; X-windings and Y-windings are mounted on a thrust core made of iron material, thus the electromagnetic force is further increased; in addition, two separated anti-yawing member are provided on the mover for counteracting yawing of the mover, accordingly interference between anti-yawing torque and the electromagnetic force for propelling is eliminated.

Abstract: A reciprocatory fluid pump includes an armature assembly which is reciprocatably mounted to the housing by a pair of spaced leaf springs extending parallel to each other and fixed at their opposite ends to the armature assembly and housing, respectively, so as to define therewith a four-sided parallelogram in which the pair of leaf springs serve as two parallel sides, and the armature assembly and housing, respectively, serve as the other two parallel sides. The leaf springs are of flat rectangular configuration constraining the reciprocatory movement of the armature assembly to longitudinal displacement with a small transverse displacement. The housing includes a base, and the pair of leaf springs are secured at one of their ends to the base such as to reduce sounds and vibrations during the operation of the pump. Several embodiments are described in which the pumping member is a diaphragm, a pair of diaphragms, and a piston, respectively.

Abstract: An electromagnetic power transferring system includes a transmission apparatus and at least a power generator having a crank shaft, a connecting rod, a generation assembly, and an electricity storage and controlling device which is connected with an electricity system and able to switch, generate and store electricity. The generation assembly includes a hollow carrier and an inner carrier, the hollow carrier having at least an opening and being wound about inducing coils, one end of the inducing coils connected to the electricity system, the inner carrier being of magnetism and sliding within the hollow carrier through the opening. An induction magnetic field is created by providing electrical current to the inducing coils and further generates induction current to drive the transmission apparatus whereby to perform a reciprocal movement, which enables the electromagnetic power transferring system to produce and store electricity and transfer power.

Abstract: Guide bar drive in a knitting machine and method of driving guide bar. The drive includes a linear motor composed of a stator and a rotor, in which the linear motor is greater in height than width. The stator has a length in a longitudinal direction and includes at least one narrow side, and the rotor is structured and arranged in the stator for translational movement in the longitudinal direction. A guide rod is positioned adjacent the at least one narrow side and extending in the longitudinal direction to support the rotor. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.

Abstract: Electrical generators are provided by causing permanent magnets to travel through hollow passageways having electrical conductors flanking or surrounding the space within the passageways. The conductors are disposed in undulating patterns the amplitudes of which are aligned in selected correlated positions relative to the lengths of the passageways and directions of the magnetic flux lines in order to maximize the electromagnetically generated voltage and current in the conductors.

Abstract: An electrically-powered linear motor for a whole body vibration (WBV) machine is disclosed for producing and imparting vibrations to a platform for supporting a user. The linear motor comprises one or more pairs of generally aligned coils for producing electromagnetic responses in one or more magnets, each disposed generally intermediate a pair of coils. Current is intermittently passed through the coils to produce vibrations within a desirable frequency range in the platform.

Abstract: An electric toothbrush includes a drive part, a driver, a brush part and a vibration-absorber. The drive part includes a drive shaft provided to be lineally movable and a brush part detachably attached to one end of the drive shaft. The driver is configured to apply reciprocal force to the drive shaft to reciprocally lineally move the drive shaft. The vibration-absorber is connected to the drive shaft via a second spring to be lineally movable along the drive shaft. A weight ratio of a weight of the vibration-absorber to a weight of the drive part is at least 0.9 and at most 1.1.

Abstract: A linear actuator for a motion system is provided with a velocity sensor for monitoring a velocity of an actuation arm that it is driving. The linear actuator comprises a magnetic field, a first coil that is controllably movable within the magnetic field by adjusting a current flowing through the first coil whereby to drive the actuation arm and a second coil that is movable with the first coil and configured such that a voltage is inducible in the second coil that is proportional to its velocity. A controller device is connected to the second coil for receiving feedback indicating the voltage induced in the second coil whereby a velocity of the actuation arm is determinable, wherein the controller device is further connected to the first coil and is operative to adjust the current flowing in the first coil based upon said feedback for controllably driving the actuation arm.

Abstract: An actuator including at least one moving body, at least one fixed body and a connecting member is provided. The moving body is suitable for moving along a direction, and includes at least one coil. In addition, the fixed body includes a permanent magnet and a yoke, wherein the coil is disposed between the permanent magnet and the yoke, and the polarity direction of the permanent magnet is parallel to the moving direction of the moving body. Furthermore, the connecting member is used for connecting the moving body and the fixed body. The actuator meets the requirements of miniaturization, low power consumption and low cost.

Abstract: Disclosed is a Stirling cooler, in which a partition contacting a front surface of an inner stator is formed on a cylinder and a second stopper serving as a snap ring contacting a rear surface of the inner stator is detachably inserted into a ring-shaped groove of the cylinder, thus allowing the inner stator to be easily attached to and detached from the cylinder. Further, a protrusion inserted into a ring-shaped groove formed in the front surface of the inner stator is formed on the partition, and serves as an end ring of the inner stator, thus simplifying the assembly and disassembly of the inner stator.

Abstract: An outer stator of a reciprocating compressor comprises: a bobbin formed as a ring shape and provided with a winding coil therein; an outer stator frame coupled to an outer circumferential surface of the bobbin and formed of a magnetic body in which a flux flows; a plurality of first core blocks coupled to the outer stator frame and positioned radially at one side of the bobbin; and a plurality of second core blocks coupled to the outer stator frame, facing the first core blocks, and positioned at the other side of the bobbin. Accordingly, deformation which may occur during manufacturing can be prevented, and a size of a motor can be minimized.

Abstract: Embodiments of the present invention relate to a linear actuator in which the play and backlash in the linear motion of a stepper motor is reduced through the use of a torsion spring coupled to the stepper motor splined shaft. Also, embodiments of the invention include a controller designed for holding in the hand or mounting to a table with a bi-directional self-zeroing control knob which controls actuator speed and displacement. A flash memory unit may be included in some embodiments in order to save position information and other information about the linear actuator when power to the linear actuator is stopped.

Abstract: An electromagnetic vibrator has a movable magnet that can move linearly in an axial direction. A field coil surrounds the movable magnet. Magnetic bumpers are disposed on opposite ends of the vibrator, and are oriented to repel the movable magnet. When an alternating current is provided in the field coil, the movable magnet oscillates linearly in the axial direction, bumping against the magnetic field of the bumper magnets and thereby creating vibration. The movable magnet may have a toroidal shape and be disposed on an axial shaft to linearly constrain the motion of the movable magnet. Two field coils can be provided to simultaneously create push and pull forces on the movable magnet. The bumper magnets can be replaced with compression springs. The electromagnetic vibrator can be very small and energy efficient; it is well suited for use in portable electronic devices, cell phones, toys, industrial mixers, and massage devices.

Abstract: A linear oscillator and an electric toothbrush capable of emitting a low noise and of being assembled compact are provided. The linear oscillator, which reciprocates a shaft in an axial direction thereof, includes a plunger movable together with the shaft in the axial direction of the shaft, an elastic member for applying an axially acting resilient force to the plunger, an electromagnetic driving unit operable to reciprocate the plunger in the axial direction of the shaft at a resonant frequency when an alternating current is supplied thereto, and a fixing member restricting rotation of the plunger about an axis thereof within a predetermined angle. The electric toothbrush includes the linear oscillator and a brush head attached to the shaft for use in brushing teeth.

Abstract: A voice coil motor apparatus for positioning is disclosed. The voice coil motor is used by the auto-focus lens control module of a miniature camera. The apparatus contains a voice coil motor, a position feedback sensor, and a positioning controller. The voice coil of the voice coil motor can be either movable or stationary, where in the former case the attached power cable is a flexible circuit board, and in the latter case the power cable is fixed. The position feedback sensor includes a photo interrupter, a light reflector, and a bias circuit used for tracking any displacement of the movable part of the motor. The positioning controller uses the voltage signals to be processed through a proportional-integral-differential computation unit to manipulate an output current for accurate positioning of the movable part of the motor within a prescribed range.

Abstract: A dynamic magnet apparatus for generating electrical power adapted to connect with a rectifier and accumulator, including a hollow elongated carrier having two opposite ends, a pair of fixed magnets positioned at outer surface of the opposite ends, a slidable magnet, and a supplemental weight, wherein the hallow elongated carrier is wrapped around by a number of coils, the fixed magnets disposed in polar opposition to the facing slidable magnet, the supplemental weight attached to the slidable magnet for increasing the weight of the slidable magnet. A feature of the present invention is that the supplemental weight can facilitate the slidable magnet traveling back and forth smoothly in the carrier due to a phenomenon of like pole repel of magnets. Another feature is that an inner surface of the carrier and an outer surface of the slidable magnet are of different profile in transverse for facilitating movement therebetween.

Abstract: A linear oscillating actuator gives a smooth reciprocatory movement with a minimum of incidental vibrations or stresses. The actuator includes an oscillator carrying a permanent magnet as well as an output shaft which is adapted to be connected to drive a load, and a stator assembly carrying 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 spring link is provided to resiliently support the oscillator to the stator assembly with a gap distance left therebetween for allowing the oscillator to reciprocate in the linear path. The spring link is configured to deform resiliently also in a direction other than along the linear path so as to allow the oscillator to move to and away from the stator assembly or to twist relative to the stator assembly.

Abstract: An energy producing apparatus utilizing magnetic pistons is provided. Permanent magnets of like polarity are employed within a cylinder of each piston and upon a top portion of said piston. The like polarity pistons have a natural desire to repel one another. A ferromagnetic slipper unit is inserted into a gap in said cylinder between the permanent magnets of like polarity to interfere with said magnetic repulsive field and to cause a magnetic attractive field. Each piston is attached to a push rod which in turn is attached to shaft and flywheel system. The change in magnetic fields from repulsion to attraction cases the piston to push up and down and turn the shaft and flywheel system. Two pistons in coincidence can be used so that while one piston is repelling, the other is attracting causing an increase in motive power.

Abstract: Disclosed herein is a power device. The power device has a power source; timing circuitry powered by the power source for producing a current pulse output having a pulse width; a switch for triggering the current pulse output produced by the timing circuitry; an armature motor powered by the power source and in electrical communication with the timing circuitry for receiving the current pulse therefrom, the armature motor comprising: an electro-magnetic core; a first winding for carrying electric current to energize a magnetic field associated with the electro-magnetic core; a second winding for carrying current to reset the magnetic field associated with the electro-magnetic core, the first and second windings wound about the electro-magnetic core; and a swinging armature for providing movement in response to the energizing of the magnetic field about electromagnetic core. The first winding and the second winding are bifilar wound together about the electro-magnetic core.

Abstract: A winding coil assembly (6) of a reciprocating motor comprising: an outer stator; an inner stator (2) arranged at an inner circumference surface of the outer stator (2) with a certain air gap; a magnet linearly and movably arranged between the outer stator and the inner stator; and a winding coil (20) mounted on either the outer stator or the inner stator, wherein the winding coil (20) is formed as a ring shape by being wound a coil (20) with a plurality of turns, and the coil (20) is molded by a molding material (22). According to this, the coil (20) is prevented from being deformed at the time of winding operation and can be manufactured to have a minute dimension, so that the number of components can be reduced and thereby a manufacture cost can be reduced.

Abstract: An electromechanical energy converter for a gaseous or vaporous medium comprising a stator (1) with two pot-shaped stator members (1a, 1b), each open at one end face and adjoining each other at these end faces, the stator members surrounding a working space (12) and forming a common magnetically permeated air gap (7) in which a coreless armature coil (25) is displaceably arranged. Arranged in the working space (12) is a freely oscillating piston (14) linked to the armature coil (25). Furthermore, at least one source (21a, 21b) for the medium, two reaction chambers (66a, 66b) each assigned to a head (15a, 15b) of the piston (14) and control means (17a, 19a, 22a, 23a; 17b, 19b, 22b, 23b) assigned to the reaction chambers (66a, 66b) for self-control of the piston oscillations are provided, by means of which the reaction chambers (66a, 66b) may be opened to the source (21a, 21b) during the piston oscillations for accepting medium under pressure, and to the working chamber (12) for releasing expanded medium (FIG.

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: A reciprocating motor includes a pair of stators and a cylindrical magnet formed as a single body and disposed between the stators, for linearly reciprocating. Accordingly, it allows facilitating a job of manufacturing and installing the magnet, so that productivity can be improved.

Abstract: An electrical generator includes one or more magnets that move relative to one or more conductors to generate an electrical signal in each conductor. Each magnet has ferrofluid bearings in the vicinity of its opposite ends to provide a low friction interface between the magnet and a support structure. The ferrofluid bearings establish a field expansion medium that directs at least a portion of the magnetic field so that a greater portion of the field intersects the conductors than in the absence of the medium. The magnet aspect ratio is preferably on the order of unity.

Abstract: A sensorless method of detecting piston collisions in a reciprocating free piston linear compressor driven by an electronically commutated linear motor having at least one excitation winding is provided. A free piston gas compressor is also provided.

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 drive system includes a rotary drive unit for rotating a shaft and a linear drive unit for moving the shaft in a linear direction. To improve efficiency and shelf life, an energy storage is mechanically connected to the shaft for biasing the shaft to seek a linear movement in opposition to the linear direction. The energy storage absorbs the kinetic energy of the shaft and releases it again subsequently.

Abstract: A moving coil type linear actuator system which can stably and linearly control a relatively large load despite using relatively low electric force applied to a coil unit, thus enhancing control accuracy and preventing energy loss.

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: A moving coil actuator that moves in a rapid back-and-forth motion is constructed with a magnet assembly that concentrates the magnetic flux in a region of limited length and with a coiled electric conductor that includes two separated regions of densely wound coil, the assembly and conductor arranged such that only one of the coil regions resides in a concentrated flux region at either end of the actuator stroke. This is achieved with either a single region of concentrated flux or two spatially separated regions of concentrated flux. In either case, the force constant, i.e., the motor force generated in each coil per unit of current through the coil, is non-linear, with a maximal force at each end of the stroke and a minimal force at the stroke mid-point. The result is an efficient use of the electric current and relatively small amounts of materials of construction, and accordingly less weight for the actuator to carry during its travel and its changes of direction.

Abstract: A power engine includes magnetic piston, electromagnetic winding, crankshaft, flywheel and voltage divider; the magnetic piston being adapted to a holder; a magnet being fixed to the piston; the winding being fixed to the holder; positive and negative currents being produced through the divider for the winding to attract and reject with that from the piston for the piston to engage in reciprocal motion for the crankshaft to output kinetics from the flywheel.

Abstract: In some embodiments, a moving magnet type linear slider capable of minimizing the effect of microvibration at the time of driving a linear motor, easily increasing the servo gain and suppressing the speed ripple is provided. The moving magnet type linear slider includes a linear motor for reciprocating a table, and a detector for detecting the relative position of the table and a fixed base. The linear motor includes an armature in which polyphase armature winding is wound around the armature core secured to a fixed base and a field permanent magnet secured to the lower surface of the table in the vertical direction and arranged between the inner side surface of the linear guide and the outside surface of the armature via gaps therebetween. The detector includes a linear scale secured to the lower surface side of the table and a sensor head secured to the upper surface side of the armature, and the central axis of the detector is substantially aligned with the thrust central axis G-G of the armature.

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: Embodiments of a linear vibrator are provided that are capable of reducing the manufacturing cost, increasing the product reliability and increasing the vibrating quantity. An embodiment of a linear vibrator can include a case formed of an upper case portion and a lower case portion coupled to each other to provide a predetermined inner space; a substrate disposed on an upper surface of the lower case portion; a first coil and a second coil installed at both end parts inside of the case and connected to the substrate; a spring having one side fixed on at least one of the inside faces of the case; and a magnet fixed at another side of the spring and located between the first and second coils inside of the case, where the magnet can vertically vibrate through an interaction with the first and second coils.