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

Abstract: A coil system whose coil arrangement comprises a plurality of coaxially sequentially placed individual coil, whose wire ends are fixed on a board strip extending along the coil arrangement with a simultaneous making of contact with an electrical circuit formed thereon. Furthermore, a method for the manufacture of such a coil system and an electrodynamic linear drive fitted therewith are provided.

Abstract: A linear oscillator includes a reciprocating moving part, a case to contain the moving part, and an amplitude control spindle moveably supported in the case. The moving part and the amplitude control spindle reciprocate at a frequency approximately equal to the resonance frequency of the linear oscillator.

Abstract: Linear electric generators include stationary windings and armature magnets arranged to reciprocate axially relative to the windings, or stationary magnet structures and movable windings arranged to reciprocate relative to the stationary magnet structures. The armature magnets or stationary magnet structures are in the form of multiple pole magnets made up of a plurality of individual pole structures, each pole structure including a pair of magnets joined to each other with facing poles of like polarity. In addition, the windings may be in the form of a double winding structure including at least one first clockwise winding and at least one second counterclockwise winding arranged in a multi-layered stacked arrangement.

Abstract: A linear drive comprising a housing and a rail, which is mounted on the housing such that they can move relatively. Drive elements on the housing and on the rail to produce relative movement between the housing and the rail. The housing has a braking device to interact with a brake track provided on the rail. The brake track is in a groove in the rail. Anti-friction elements between the housing and the rail ride in the groove.

Abstract: A rotation/displacement converting actuator has an actuator unit constituted by a displacing body and an actuator in which the displacing body can be linearly displaced. The actuator has a pair of plate-shaped bases, a rotor, a vibrating element that rotates the rotor, and a cam mechanism for converting rotary motion of the rotor to linear motion of the displacing body. The rotor is fixed to a shaft to which the rotor (cam rotor) is fixed. An outer circumferential surface of the rotor constitutes a cam surface of the cam mechanism. A roller is provided at a tip portion of the displacing body. The roller abuts on the outer circumferential surface (cam surface) of the rotor.

Abstract: A reciprocating motor in which a plurality of eddy current preventing holes (26) are formed in the directions of circumference and shaft of a magnet frame (10) in a magnet mounting portion (12) of the magnet frame (10)connected between the magnet (8)and component part which will perform a reciprocating movement, for transmitting a reciprocating movement of the magnet (8) to a component part, to prevent deformation of the magnet frame (10)in molding the eddy current (26) and maintain roundness of the magnet frame precisely by improving the structure of the eddy current preventing holes which are molded in the magnet frame.

Abstract: A manually operated voltage generating device provides an electrical voltage for operating an electronic unit such as a remote control handheld unit. The device has a permanent magnet mounted in a horizontal manner at the underside of a mild steel plate. The magnet is normally located in a spaced manner from the central post of an E-shaped core. A winding is wound on the central post. A compression spring mounted over the core maintains the magnet normally spaced above the core. The mild steel plate is operative in an up and down manner against the spring force of the spring to move the magnet in a reciprocating movement relative to the core so as to generate a current in the winding. The current charges a capacitor, and the voltage across the capacitor provide the electrical voltage for operating the electronic unit.

Abstract: A dynamic magnet system, particularly useful for electrical generation, employs multiple magnets in polar opposition to each other for individual movement relative to a support structure. The magnets have a critical angle of displacement from a horizontal static position of less than 1 degree, with at least some of the magnets having mutually different properties. With different magnetic strengths, a greater movement is produced for both magnets in response to movements of the support structure, for particular ranges of magnetic strength ratios, than would be the case with equal magnets. The magnet movement can be translated into an electrical signal to power an operating system. Ultra low friction ferrofluid bearings can be used to establish static coefficients of friction between the magnets and support structure less than 0.02, enabling useful power generation from only slight movements of the support structure.

Abstract: In a reciprocating device having a moving element, a stator and a flexing suspension for coupling the moving element and stator and for maintaining the moving element on axis, the flexing suspension comprising: at least one flexing element locating the stator relative to the moving element by directly engaging features of the flexing element to mating features of the stator.

Abstract: In a reciprocating motor capable of securing a stability of a motor by improving a strength of a magnet frame, preventing breakage of the magnet frame in operation of the motor and preventing an inner stator from rotating and separating from a support frame, the reciprocating motor includes an inner stator locker installed between the inner stator and the support frame and preventing the inner stator from separating from the support frame and a magnet frame having plural support bars formed at regular intervals so as to form a space portion in which the magnet is installed in the circumference direction.

Abstract: A stamping device (1), which in particular is arranged for stamping unfired ceramic substrates, has a die holder device (8) with a plurality of dies (4, 5, 6, 7), which for activation can be locked to the die holder device (8) and then jointly with it execute an axial stamping motion. A coupling device (18) which is remote-actuated is used for the locking. For the remote transmission of the actuation motion, a flexible mechanical connecting means is used, such as preferably a cable (16).

Abstract: A reciprocating motor comprises a mover (400) including an opening unit formed as a ring with an opening on (110) its one side; a first stepped unit (120) in which the inner interval of the opening (110) unit is narrowed gradually toward the entrance; and a second stepped unit (130) continued with the first stepped unit (120) and forming the entrance of the opening unit. According to that, the length of the permanent magnet (420) is decided and the entrance width of the opening unit in which the winding coil (300) is located is reduced, thereby the amount of high price permanent magnet used is reduced, reciprocating movement of the mover getting out of the outer core is minimized, flux on the outer core and the inner core flows smoothly, and leakage of the flux is reduced so the function of the motor can be improved.

Abstract: An electric actuator for providing an angular reciprocating drive, comprising a casing, a stator housed in the casing, and an armature extending co-axially through the stator. The stator has an annular arrangement of poles and a coil for energization by an alternating current to magnetise the poles in opposite polarities as between adjacent poles. The armature has a shaft supported by the casing for angular movement and a plurality of permanent magnets mounted fast on and around the shaft. The magnets have proximal sides as between adjacent magnets of opposite polarities, wherein upon repeated reversals of said alternating current the magnets interact magnetically with the poles to cause the shaft to oscillate thereby providing said drive.

Abstract: A dynamic magnet system, particularly useful for electrical generation, employs multiple magnets in polar opposition to each other for individual movement relative to a support structure. The magnets have a critical angle of displacement from a horizontal static position of less than 1 degree, with at least some of the magnets having mutually different properties. With different magnetic strengths, a greater movement is produced for both magnets in response to movements of the support structure, for particular ranges of magnetic strength ratios, than would be the case with equal magnets. The magnet movement can be translated into an electrical signal to power an operating system. Ultra low friction ferrofluid bearings can be used to establish static coefficients of friction between the magnets and support structure less than 0.02, enabling useful power generation from only slight movements of the support structure.

Abstract: An electrical generator includes a magnet constrained to move relative to a conductor by a support structure, with a ferrofluid bearing providing an ultra low friction interface between the magnet and support structure. The assembly has a critical angle of displacement from a horizontal static position of less than 1 degree, and preferably less than 10 minutes. An electrical signal is generated in the conductor by the moving magnetic field.

Abstract: An electromechanical actuator has at least one electromagnet, an armature and a resetting device. A connector is provided, with at least one contact element, which is electro-conductively connected to the coil of the electromagnet, and which is disposed in such a way that, at least during the assembly to the actuator onto a support, it can be electrically contacted by an assembly contacting element.

Abstract: An electrical generator has a plurality of spaced magnets that move together relative to at least one coil to generate an electrical signal in the coils. Equal numbers of magnets and coils, with equal lengths and spacings between them, are preferably employed. Significant enhancements in power output are achieved by orienting successive magnets in magnetic opposition to each other, so that the magnetic fields from successive magnets along the axis of movement substantially cancel each other at locations between the magnets.

Abstract: A Reciprocating Generator Wave Power Buoy consists of a reciprocating generator rigidly attached to the underside of an ocean buoy and creates electric power from the surface ocean swells. The generator coil maintains a stable position beneath the ocean surface while the magnetic field housing reciprocates with the vertical motion of the buoy in response to interaction with swell and waves on the surface of the ocean. Damping plates attached to the generator coil inhibit the motion of the generator coil, thus keeping it in a stable position relative to the motion of the magnetic housing. The magnetic housing focuses the magnetic field through the generator coil and the relative motion between the magnetic housing and generator coil creates an electromotive force in the coil. The design of the generator provides a uniform field of single magnetic orientation throughout the entire stroke of the generator.

Abstract: A dynamic magnet system, particularly useful for electrical generation, employs multiple magnets in polar opposition to each other and having a critical angle of displacement from a horizontal static position of less than 1 degree, to induce an electrical signal in one or more surrounding coils. The magnets interact with each other to yield multiple modes of oscillation and a greater range of response to applied inputs than is achievable with a single magnet system. A lubricant for the magnets is preferably a ferrofluid that establishes a static coefficient of friction between the magnets and their support structure less than about 0.02, with a viscosity less than 10 centipoise. The magnets can be oriented for movement in a primarily horizontal direction and are adaptable to numerous different kinds of support structures, including ring-shaped.

Abstract: A motor for driving a load, such as a tool or a workpiece, can be installed in a machine, for example an eccentric lathe. The motor has an output-drive section associated with the useful load, a reaction section which interacts with the drive section, and a base that rigidly supports the motor in the machine. The reaction section of conventional motors is typically rigidly attached to the machine, so that vibration can be introduced in the machine bed if a strong force is transmitted to or received from the load. According to the invention, these vibrations can be reduced or eliminated by mounting the reaction section on the base in such a way that any movement by the output-drive section can be compensated by a corresponding opposing movement of the reaction section. The inertia of the reaction section hence compensates the corresponding opposing forces in the event of sudden or strong acceleration of the load.

Abstract: The invention provides an electromagnetic reciprocal drive mechanism having a movable part that is simple to manufacture, dimensionally stable and inexpensive. The device has; a permanent magnet cluster 3, and a spider 4 and retainer 5 that concentrically support the permanent magnet cluster 3, an outer laminated core 6 provided adjacent to the permanent magnet cluster 3, and an electromagnetic coil 8 wound around the outer laminated core 6. An adhesive paper sheet 13 having an adhesive layer 11 on an inner surface and which can be impregnated with an adhesive 12 is wrapped around an outer periphery of the permanent magnet cluster 3, the spider 4 and the retainer 5. The adhesive 12 is then impregnated into the adhesive paper sheet 13 and solidified. In the adhesive paper sheet 13 and the adhesive layer 11 is formed of a plurality of small holes.

Abstract: A valve assembly has a valve body defining a chamber with a controlled outlet. A stop and seat are spaced from each other and are supported within the chamber in axial alignment with the controlled outlet. A plunger reciprocably moves between the stop and the seat to open and close the controlled outlet through the operation of a solenoid assembly. The solenoid assembly includes a spool supported between two plates. An electrical coil is disposed around the spool for receiving electrical current and generating a magnetic flux. A primary magnetic flux loop forms a path around the spool, through the two plates, the plunger and the stop to move the plunger away from the controlled outlet. An annular magnetic flux regulator made of magnetic conductive material is disposed in the spool to provide a secondary bypass magnetic flux flow path for a portion of the generated magnetic flux during high amp-turn operating conditions.

Abstract: A stator structure of reciprocating motor is provided. The stator structure includes a cylindrical stacked core having a plurality of lamination sheets each having a hanging groove, and an elastic ring elastically inserted into and fixed to the hanging groove. The lamination sheets are arranged extending radially and axially with respect to a longitudinal centerline of the cylindrical stacked core. Accordingly, the cylindrical stacked core is firm and the fastening strength between the cylindrical stacked core and an outer core is improved. Therefore, the reliability of the stator structure is improved. Also, it is possible to reduce manufacturing costs and to improve assembly productivity.

Abstract: In varying embodiments, the fault tolerant linear actuator of the present invention is a new and improved linear actuator with fault tolerance and positional control that may incorporate velocity summing, force summing, or a combination of the two. In one embodiment, the invention offers a velocity summing arrangement with a differential gear between two prime movers driving a cage, which then drives a linear spindle screw transmission. Other embodiments feature two prime movers driving separate linear spindle screw transmissions, one internal and one external, in a totally concentric and compact integrated module.

Abstract: A pneumatically driven electric power generator includes a cylinder having one end connected to an air supply passage for receiving pressurized air and a piston having an associated magnetic moment. A portion of the piston is free to move into and out of the open end of the cylinder. An O-ring prevents airflow between the piston and the cylinder when a portion of the piston is located within the cylinder. A spring forces the piston from a position outside of the cylinder to a position inside the cylinder, so that the piston oscillates, moving into and out of the cylinder, driven by air supplied through the air supply passage. One or more electric coils are placed to enclose changing magnetic flux caused by the magnetic moment associated with the oscillating piston whereby an emf is generated in the coil(s) so that an external circuit connected to the coil(s) to complete a circuit through the coil(s) may receive electric power from the coil(s).

Abstract: A thread guide (33) for traversing and guiding a thread (5) in a rotating winding bobbin (1) for producing a cross-wound bobbin in a bobbin winder of a textile machine by controlling vibrations of the thread guide. The thread guide (33) is permanently and directly connected to at least one energy accumulator (20,21) throughout the entire traversing motion. The potential energy of the energy accumulator (20,21) increases continuously after the dead center of the traversing area. A substantially harmonious oscillating mechanical system is thus formed with the thread guide.

Abstract: A tightly closed casing has an inside space for storing coolant gas. A block is accommodated in this casing. A motor includes a stator and a mover. A piston is connected to the mover of the motor. A movable element includes the mover of the motor and the piston. A stationary element includes the stator of the motor and the block. An elastic element has a portion fixed to the movable element and another portion fixed to the stationary element. A cylinder is shiftable in an axial direction with respect the block. A shifting device shifts the cylinder in the axial direction.

Abstract: An electromagnetic linear generator and regenerative electromagnetic shock absorber is disclosed which converts variable frequency, repetitive intermittent linear displacement motion to useful electrical power. The innovative device provides for superposition of radial components of the magnetic flux density from a plurality of adjacent magnets to produce a maximum average radial magnetic flux density within a coil winding array. Due to the vector superposition of the magnetic fields and magnetic flux from a plurality of magnets, a nearly four-fold increase in magnetic flux density is achieved over conventional electromagnetic generator designs with a potential sixteen-fold increase in power generating capacity.

Abstract: An apparatus for controlling the tension of a traveling yarn includes a rake tensioner having stationary and displaceable yarn tensioning elements in engagement with the traveling yarn, and an electrical coil to which electrical current is supplied by a regulating device. The displaceable yam tensioning elements and the electrical coil are disposed on a common pivot lever. The electrical coil is pivotable in an air gap through which magnetic field lines pass. The tension of the traveling yarn is controlled as a function of the current supplied to the electrical coil. The present invention, thusly, improves the control of the tension of the traveling yarn in spinning or bobbin winding machines.

Abstract: In a reciprocating device having a moving element, a stator and a flexing suspension for coupling the moving element and stator and for maintaining the moving element on axis, the flexing suspension comprising: at least one flexing element locating the stator relative to the moving element by directly engaging features of the flexing element to mating features of the stator.

Abstract: A permanent magnet, bistable actuator mechanism that uses magnetic repulsion for actuation, the actuator mechanism having a first translator member with a permanent magnet element displaceable between a first position and a second position and a second translator member having a permanent magnet element displaceable between a first position and a second position with the permanent magnet elements in mutual repulsion, the translator elements being arranged in a frame or containment structure that limits displacements of the first and second translator members with one of the translator members being a master member and the other being a slave member, such that displacement of the master member from one position to the other displaces the slave member in an opposite direction with the displacement process being reversible.

Abstract: A linear suspension element having preloaded legs that reduce fretting and maximize stroke within allowable stress limits. Also, a reciprocator and suspension including the linear suspension element.

Abstract: Electromagnetic apparatus for producing an axially directed force comprising a stator having a plurality of axially spaced coils around a working volume within which an armature in the form of a free piston is axially displaceable, the armature having means for producing a magnetic field a substantially radially directed part of which intersects at least some of the coils of the stator such that a resultant axially directed force is generated when a current flows in the coils.

Abstract: A reciprocating rotary action actuator consisting of a rotor and stator that can be added to a bi-directional rotary motor or galvanometer scanner, where the stator has a ring magnet and a pair of soft iron pole pieces that concentrate the flux of the ring magnet into a concentric set of narrow, uniformly spaced, axially oriented, magnetic flux fields intersecting the rotor's field of travel. The rotor has small permanent magnets embedded in the periphery of a nonconductive, nonmagnetic rotor core. The rotor magnets have the same number and spacing as the stator's magnetic flux fields. The magnet poles are oriented opposite the flux fields of the stator pole pieces, so that upon rotation, the rotor magnets encounter the stator flux fields at each end of rotor travel, creating an opposing force that reverses the angular direction of the rotor with minimal requirement for actuator current and generation of thermal losses.

Abstract: In an electromagnetic actuator, a rotor composed of a permanent magnet is mounted rotatably in two directions between a first end position and a second end position via an intermediate position. A coil is wound around the rotor to rotate the rotor in an energizing state where an electric current is applied to the coil. An auto-retaining device is provided for retaining the rotor at one of the intermediate position, the first end position and the second end position under a non-energizing state where the electric current is not applied to the coil. The auto-retaining device has an elastic member that regulates the rotor at the intermediate position by a mechanical elastic force, a first magnetic member that is opposed to the permanent magnet and that retains the rotor at the first end position by a magnetic attractive force, and a second magnetic member that is opposed to the permanent magnet and that retains the rotor at the second end position by a magnetic attractive force.

Abstract: The respective magnets of each of a plurality of spaced Halbach magnet arrays in both the X and Y directions that incorporate in the arrays in both directions, the magnets having a field oriented parallel to the Z axis in alternately the positive and negative directions. The magnets in each array in each direction that are not shared by the crossing Halbach magnet arrays each has a horizontal field orientation parallel to either the X or the Y axis with the filed direction in each instance pointing toward the adjacent magnet having its field oriented in the positive Z direction. Additionally, four layers of coils of wire in separate X-Y planes in substantially vertical alignment with each other contain coils each with a selected orientation relative to the X or Y axis such that they provide levitation, lateral motion, as well as roll, pitch and yaw adjustments to the magnet array forming an X-Y stage for precision positioning an object located on the top surface of the magnet.

Abstract: There is provided a provide a solenoid actuator which is capable of smoothly driving a driven member, with enhanced durability, and at the same time permits the stroke of the driven member to be changed with ease. A solenoid actuator drives a valve by an electromagnetic force such that the valve performs reciprocating motion. An armature is connected to the valve, for performing reciprocating motion in accordance with energization and deenergization of at least one electromagnet to thereby drive the valve such that the valve performs the reciprocating motion. The armature has two end faces extending in parallel with each other in a direction orthogonal to a direction of the reciprocating motion thereof. Two guide joints have respective two guide surface opposed to the two end faces of the armature, each formed with two armature guides.

Abstract: A load-control type actuator is provided, in which the impact load applied to a workpiece is reduced enabling damages in the workpiece to be small. A load-control-type actuator includes a nozzle which comes into contact with a workpiece, a nozzle holder for supporting the nozzle via a spring, and a voice-coil motor which can control a thrust driving force to the nozzle holder. The spring constant of the spring is set so that the spring reaction force of the spring within the response time of the voice-coil motor is reduced smaller than the maximum impact load when the nozzle touches the workpiece. The nozzle is suspended and supported by the spring and the initial load thereof is set to zero.

Abstract: A poly phase linear alternator comprising a housing. An input power gear train is mounted in one end of the housing. The input power gear train is rotatably driven by an outside power source. A pair of track guide rails are each mounted in an opposite side of the housing. A pair of eccentric assemblies are slidably mounted on the track guide rails. The eccentric assemblies are spaced apart and driven by the input power gear train to oscillate away from and towards one another in a linear movement. A pair of magnetic assemblies are slidably mounted on the track guide rails between the eccentric assemblies. Each magnetic assembly is connected via two spacers to one eccentric assembly. The magnetic assemblies can also oscillate away from and towards one another in a linear movement. Four stator assemblies are also provided. Two of the stator assemblies are mounted in the housing below the magnetic assemblies, while two of the stator assemblies are mounted in the housing above the magnetic assemblies.

Abstract: A linear motor and/or compressor (10; 100; 300; 500; 600) comprises a housing (20; 120; 311; 511) fitted with a number of electromagnets (40, 40′; 140, 140′; 315, 315′, 316; 515a-515c, 635a-635d), a shuttle (50; 150; 350; 550; 650) with a central guide (30, 30′; 130; 356, 356′; 520; 655) for keeping it coaxial with the electromagnets and a suspension mechanism for the shuttle including mechanical spring, gas spring and magnetic spring arrangements. The electromagnets form a number of axially exposed magnetic gaps to interact with axially exposed magnetic gaps formed on the shuttle to cause it reciprocate by push-and-pull forces. A phase difference can be produced between the electromagnets to improve shuttle suspension. The central guide can be made hollow to circulate a coolant to cool the compressor from inside.

Abstract: A yarn guide imparts a traversing motion to a yarn being delivered to a rotationally driven takeup bobbin in a textile yarn winding operation to create a cross-wound bobbin, or cheese. The yarn guide includes a fork-like yarn guide pivoted about a pivot axis substantially perpendicular to the axis of the takeup bobbin, and an electromagnetic mechanism for driving the guide. The electromagnetic mechanism includes an air gap, a plurality of magnets disposed along the air gap, a plurality of yokes and at least one electrical coil extending into and moveable along the air gap with the traversing yarn guide. The magnets are disposed along the air gap and generate magnetic field lines which extend in a substantially perpendicular direction through the air gap.

Abstract: A thermoacoustic driver incorporates a linear electrodynamic motor having electrical terminals and a moving part, a driver suspension housing, a piston, and a stiffness-enhancing device for raising the mechanical resonance frequency of the electrodynamic motor without reducing the piston stroke. The stiffness enhancement is accomplished by the use of specially optimized suspension spring structures and/or by attaching one or more electrical inductors to the electrical terminals of the driver. The stiffness enhancement using mechanical springs incorporates one or more starfish structures extending between the driver suspension housing and the piston and rigidly clamped to both. The starfish structures comprise radially extending legs, which are leaf springs or beams of varying width. The shape of the beams and the shape of the overall spring structure are optimized to enhance flexural or torsional stiffness and relieve arc tension within the constraints of cost-effectiveness.

Abstract: The invention is based on an electromagnetic actuator for activating a gas exchange valve. The latter has both an opening magnet and a closing magnet, between which an armature which is connected to a valve stem is arranged in a coaxially displaceable fashion. The armature is held in a position of equilibrium between the magnets by means of an upper and a lower prestressed valve spring when the magnets are in a currentless state. In order to be able to control the actuator better, a plunger coil is connected to a valve stem of the gas exchange valve and is arranged coaxially with respect to said valve stem. Said plunger coil dips into a radially magnetized air gap of an annular, axially magnetized permanent magnet.

Abstract: A hand power tool has a housing; at least one handle having at least one gripping part; at least one elastic, vibration-damping element; a mounting part mounted on the elastic element; the gripping part being mounted on the housing through the elastic element and through the mounting element; and at least one movable safety element through which the gripping part is connected with the mounting part.

Abstract: A vibration generator which is durable, provides strong thrust and is capable of being reduced in size, cost and weight includes a movable element (50) having a permanent magnet (60) attached thereto; a stationary element (10) having end faces (23), (25) which oppose, across prescribed gaps, respective ones of end faces (53), (54) of the movable element, with the stationary element being excited by passing a current through an attached coil (30) to form a magnetic path with the movable element; and resilient support members (80) for supporting the movable element so that the movable element can vibrate in a direction in which the stationary element is magnetized by the coil.

Abstract: A linear shuttle motor assembly used for reciprocally moving a printer head includes a rotor and a stator having the same mass. A loud, i.e., the printer head, is connected to the stator and a counter balance to the rotor. The rotor and the stator are driven to reciprocally move in mutually opposite directions. A 180 degree phase synchronizing mechanism is used to synchronize phases of the rotor and the stator. The mechanism is fixed to a housing and connected to the rotor and the stator. By this configuration, the amount of power transmission loss is reduced to a minimum, which improves energy conversion efficiency.

Abstract: An apparatus for cooling an electronic device includes a case where a plurality of air intake/exhaust holes through which air passes are formed. A plate type mobile member is installed to vibrate in the case and divides an inner space of the case into an upper space and a lower space. An elastic support film is fixed in the case to support the mobile member and has a bulged portion capable of being elastically deformed. A driving device is provided for vibrating the mobile member. By the vibration of the mobile member, air in the upper and lower spaces of the case is exchanged with outside air through the air intake/exhaust holes so that a heat source is cooled.

Abstract: To provide a reciprocation motor capable to detect rotation angle of rotor accurately. Rotor 1 is a magnet having two poles to radial direction and comprises half-cylindrical magnets. Driving coils 5a and 5b are bound equally at coil board 3. Magnetic sensor 7 is fixed at outside and under side of driving coil 5b on coil board 3. Such a construction makes magnetic sensor hard to be influenced by flux generating caused by current flowing through driving coil 5b. Therefore, it is possible to improve position detecting accuracy of rotor 1.

Abstract: A spring coefficient adjustment system for a vibratory drive for use in driving a vibratory delivery apparatus. The drive includes an electromagnet and an associated armature spaced apart by a gap. In the drive, a plate is movable with respect to a frame. One of the electromagnet and the armature is connected to the frame and the respective other is connected to the spring plate. A primary spring is connected between the frame and the spring plate. A plurality of auxiliary elastomer shear springs are selectively engageable between the frame and the plate to change the total spring coefficient between the frame and the plate.