463 results about "Moving magnet" patented technology

The present invention provides a planar magnetron including a surface for mounting a planar substantially polygonal target (2) having a substantially central target area for sputtering onto a substrate. The magnetron comprises an array of magnets (4) defining a closed loop magnetic field for generating an elongated plasma race-track above the target (2). Means for establishing cyclical, relative, substantially translational movement between the race-track and the target support surface are provided, the substantially translational movement being substantially parallel to this surface and the trace of the substantially translational movement being a two-dimensional figure. The periphery of the race-track lies substantially within said substantially central target area throughout each cycle, the establishing means being adapted to provide a substantially uniform erosion of the target (2) at least within said substantially central target area.

The present invention relates to a moving-magnet straight-line compressor. It includes a linear motor component, it mainly has inner and outer magnetic yokes with concentric combined structure, moving-magnet coil, permanent magnet and motor runner bracket, the permanent magnet is positioned on the motor rotor bracket and placed in the magnetic field formed from inner and outer magnetic yokes; a compressor component, it mainly has machine seat, cylinder, exhaust valve and suction valve which are positioned on the machine seat and piston connected with motor runner; and a machine shell which is seal-connected with machine seat. It is characterized by that it also includes a suspension component, it mainly has a spring support frame, flexible springs, inner and outer washers and collision-prevention mechanism, etc.

A sliding device with onboard moving-magnet linear motor is envisaged making the reciprocating stroke of a table longer, and enhancing the propulsion, high velocity and response of the table even with small in dimension, compact in construction and better in production efficiency. With the sliding device, a bed serves as a coil yoke while a table is as a magnet yoke. An armature assembly is composed of armature windings, a board on which the armature windings lie in juxtaposition, a wiring lying on the board and making connections with a power line to supply electric power to the armature windings, a protective sheet covering an overall surface of the armature windings and moldings of adhesive material to get the armature windings and connections of a power line with wiring closely adhering to the board.

In electric motor assemblies, separating the x and y coils may achieve significant advantages. An advantageous design includes pairs of interacting magnet array/coil arrays. Separated coil arrays are provided, with a coil array on an arm connected to a following stage, and another coil array on a stage base (the stage being one to which is attached magnet arrays). Positioning devices, moving magnet motor assemblies, moving coil motor assemblies, and methods of driving a stage are provided. By differential driving and creation of torques about the x and y axes, a stage may be driven in six independent degrees of freedom.

An ear canal pressurization device optimized for aural acoustic immittance testing is disclosed. The preferred embodiment of the device is comprised of a rigid mounting framework which holds in position, axially aligned, a first flexible chamber assembly, a centrally disposed forcer assembly, and a second flexible chamber assembly. The forcer assembly comprises a ferromagnetic bobbin and coil that provides electromotive force for a moving magnet linear motor. The motor is comprised of a rigid chamber link, which passes through the hollow core of the bobbin, with a ferromagnetic keeper washer and axially aligned rare earth ring magnet at either end, with like magnetic poles facing each other. The motor is elastically suspended between the first and second flexible chambers. Current flow through the coil of the forcer assembly provides motive force for the motor via attraction or repulsion of the motor magnets and movement of the motor increases the volume of the first flexible chamber while decreasing the volume of the second flexible chamber, or vice versa. The internal volume of the first flexible chamber is coupled via an air line to an ear canal and through a controlled valve to a small vent, and the internal volume of the second flexible chamber is vented to ambient air pressure. Changes in volume of the first flexible chamber, due to motor movement, produce changes in ear canal pressure re Boyle's law. The vent may be opened to allow ear canal pressure to gently equalize to ambient air pressure or to generate ear canal pressure sweeps free of pressure baseline offset. The vent may be closed to set a static ear canal pressure or to generate ear canal pressure sweeps with an incidental baseline offset. The vent may be controlled to generate ear canal pressure sweeps with an intended baseline offset. The device produces ear canal pressure proportional to drive voltage, so any desired pressure versus time function can be generated by applying a coil driving voltage with the appropriate amplitude versus time function. The device operates quietly to avoid interference with aural acoustic immittance measurement, and should have a long and maintenance free life span.

A moving-magnet, linear motor which substantially produces no cogging force is provided. The moving-magnet, linear motor has a mover and a stator. The mover has a plurality of permanent magnets orderly disposed along the traveling direction of the mover. The stator has a toothed iron-core having a plurality of teeth and a plurality of coils wound around the teeth thereof. The permanent magnets are disposed such that the two longitudinal ends of each permanent magnet are skewed with respect to each other by a tooth pitch of the toothed iron-core.

A system of moving magnets for sealing a container may include a plurality of moveable magnets disposed near a perimeter of a container door and a rotatable linkage hub positioned within the perimeter of the container door. In addition, the system may include a plurality of control linkages connecting each of the plurality of moveable magnets to the linkage hub so that rotating the linkage hub causes the control linkages to move the moveable magnets between a sealed position and an open position. Alternatively, the moveable magnets may be connected to each other by a magnet positioning mechanism to physically move the magnets along a path near the perimeter. A plurality of static magnets may be disposed near an opening sized to receive the container door and positioned to form a magnetic seal with the moveable magnets when the moveable magnets are positioned at the sealed position.

An integrated multifunctional micro speaker including a speaker frame having an upper portion (an outer portion) that is configured by a moving voice coil type speaker and a lower portion (an inner portion) that is configured by a moving magnet and weight type vibrator supported by a suspension, thereby reproducing a sound and a vibration. The multifunctional micro speaker includes a cylindrical speaker frame; a yoke having an end fixed to the cylindrical speaker frame; a speaker magnet fixed onto the yoke; a speaker plate fixed onto the speaker magnet; a diaphragm having an outer circumferential surface supported against the cylindrical speaker frame; a voice coil that is attached to the diaphragm so as to be disposed in a space formed between the speaker plate and the yoke; a suspension fixed to a lower portion of the speaker frame; a cylindrical weight attached to a central portion of the suspension; a lower plate attached onto the cylindrical weight and having the same shape as the cylindrical weight; a vibrator magnet attached onto the lower plate and having the same shape as the lower plate; an upper plate attached onto the vibrator magnet and having the same shape as the vibrator magnet; and a vibrator coil attached to the yoke.

A magnetic spring arrangement for a resonant motor, comprising: a housing (12), magnets (14, 16) fixed in position at opposing ends (13, 15) of the housing, a magnet (18) positioned within the housing for movement toward and away from the fixed magnets in a reciprocal oscillating motion with a driving action produced by a stator coil (24) and an AC drive signal (26), wherein an applicator member (32) is attachable to the moving magnet for corresponding movement of a workpiece portion (34) of the applicator member.

A moving-magnet type linear motor is provided with cooling blocks which are attached to each of stator bases alongside a coreless coil and which allow coolant to flow therethrough for cooling the coreless coil. Each of the cooling blocks has in a base end portion thereof a fluid passage for flowing coolant and at an extreme end portion thereof a plurality of sheet-like protrusions like fins which are arranged alongside a part of the circumferential surface of the coreless coil with a clearance between each protrusion and the next thereto. Each cooling block is thermally closely jointed with the coreless coil at the extreme ends of the sheet-like protrusions.

The invention provides a high-pressure-resistant moving-magnet type bidirectional proportional electromagnet which comprises push rods, yokes, a shell, control coils, a first permanent magnet, a magnetic conduction ring, an armature, a second permanent magnet, limiting plates, guide sleeves and non-magnetic rings. Flanges of the yokes are matched with inner holes of the guide sleeves, and the three guide sleeves are magnetic conductors, are separated from one another by the non-magnetic rings made of non-magnetic-conduction materials and then are integrated with one another by means of welding. Compared with the prior art, the high-pressure-resistant moving-magnet type bidirectional proportional electromagnet has the advantages that the permanent magnets are used as main moving components, so that the shortcoming of constraints due to magnetic saturation and the like can be overcome, and outputted force of a system can be greatly increased; the outputted force or displacement can be bidirectionally and continuously controlled, and zero positions and dead zones can be prevented; the high-pressure-resistant moving-magnet type bidirectional proportional electromagnet is high-oil-pressure-resistant and can be used as a wet electro-mechanical converter; the high-pressure-resistant moving-magnet type bidirectional proportional electromagnet is simple in structure and low in manufacturing cost.

In some embodiments, a moving magnet type linear slider capable of eliminating a magnet suction force caused by a linear motor to minimize the linear guide friction is provided. The field of the linear motor includes magnet track having a horizontally arranged generally U-shaped magnetic yoke and plural pairs of field permanent magnets arranged on inner opposed surfaces of the magnetic yoke with polarities arranged alternately in a longitudinal direction of the magnetic yoke, each pair of the filed permanent magnets being arranged with opposite polarities faced with each other. The armature of the linear motor includes an armature holder mounted on the side portion of the fixed base in a vertically extended manner, and a planar coreless armature holder horizontally held by the armature holder. The stroke direction length L_mg of the magnet track is set to be longer than the stroke direction length L_a of the armature. Furthermore, a gravity compensation spring for compensating the weight of the movable unit is provided at the bottom portion of the magnet track so as to face the fixed base.