Abstract: A magnetic screw having a screw shaft of magnetic material having thread crests formed on the outer peripheral surface thereof, and a magnetic nut fitted on the outer periphery of the screw shaft. The magnetic nut includes annular permanent magnets magnetized with magnetic poles of opposite polarities on opposed sides, and annular yokes disposed such that the annular yokes are magnetically coupled with the magnetic poles of the magnets. The inner peripheral surfaces of the yokes are provided with thread crests corresponding with the thread crests of the screw shaft with a minute gap G defined therebetween such that magnetic circuits are formed between the screw shaft and the magnets through the thread crests of the screw shaft. The magnets are magnetized on their inner and outer radial surfaces with magnetic poles of opposite polarities, and the yokes are fitted in the magnets.
Abstract: In a gearing stage, a driving first wheel has a ferromagnetic profiled rib which is circumferential in one thread, whereas a second driven wheel has permanently magnetic profiled ribs which are disposed in a multi-start manner and which extend only over a fraction of the circumference and are opposite the ferromagnetic profiled rib with a small air gap. The driving wheel drives the driven wheel via a magnetic reluctance coupling.
September 21, 1998
Date of Patent:
July 18, 2000
Max Stegmann GmbH Antriebstechnik-Elektronik
Abstract: A method for designing an optimal bi-axial type of magnetic gear system that uses magnetic coupling for transmitting torque in order to be free from the defects caused by using a conventional mechanical gear system. A non-coaxial rather than a conventional coaxial type of magnetic gear design is considered for this invention. For the non-coaxial magnetic gear system, the size of torque will depend on the number of poles magnetized out of the strong magnetic material around the magnetic gear. Therefore, the optimum number of magnetized poles must be carefully selected for a set of specified conditions such that the largest torque can be obtained. An optimal magnetic gear system can be produced by the method in this invention.
December 19, 1997
Date of Patent:
April 11, 2000
Industrial Technology Research Institute
Abstract: A gear arrangement which prevents clattering or rattling noises associated with the engagement of gear teeth with another gear includes a gear and a magnetic toothed disk engaging one side of the gear and having the same diameter as the gear and a different number of teeth than the gear.
Abstract: An oscillatory drive incorporating the invention includes a driven rotor that is mounted on a shaft and includes plural driven permanent magnets disposed thereon. A spring arrangement is coupled to the driven rotor and limits both clock-wise (CW) and counter-clockwise (CCW) rotation thereof. A first driving rotor includes first driving magnets, is mounted for rotation on the shaft and is positioned to a first side of the driven rotor. A second driving rotor includes second driving permanent magnets, is mounted for rotation on the shaft and is positioned to a second side of the driven rotor. The drive mechanism imparts a CW rotation to the first driving rotor and a CCW rotation to the second driving rotor. The first driving permanent magnets coupling to the driven permanent magnets causes a CW rotation of the driven rotor until the spring arrangement terminates the CW rotation and causes a reversal of rotation direction in the CCW direction.
Abstract: This magnetic screw device comprises a screw shaft made of magnetic material and having thread ridges formed on the outer peripheral surface thereof, and a nut body fitted on the screw shaft with a clearance defined therebetween. The nut body comprises a magnetic sleeve having a smoothly finished inner peripheral surface and substantially concentric with the screw shaft, and guide rings disposed at the opposite ends of the magnetic sleeve as viewed in the thrust direction, and a housing for holding the magnetic sleeve and guide rings. The magnetic sleeve is helically magnetized on its inner peripheral surface with magnetic poles opposed to the thread ridges of the screw shaft, so that when the screw shaft is rotated, the nut body 7 is linearly moved by the magnetic action.
Abstract: A device for rotating a layered body includes multiple rotating plates arranged in equally spaced layers and coaxially aligned about an axis of rotation. Facing plate surfaces between each pair of neighboring plates form a gap between neighboring plates. At least one magnetic pole is provided on each plate surface that forms a gap. The magnetic poles being arranged such that the polarities of magnetic poles on facing surfaces in each gap are the same. When the rotating plates are stationary, the at least one magnetic pole on one plate is arranged to occupy an alternating position with a corresponding magnetic pole on the facing surface of the neighboring plate.
Abstract: A magnetic gear configuration utilizing non-metallic magnetic material about a circumference of a rotatable member is disclosed. A plurality of magnetic units may be spaced around the circumference of the rotatable member. Each magnetic unit may extend along a direction substantially parallel to the central axis of the rotatable member and each magnetic unit may be inversely aligned to its adjacent magnetic unit. The magnetic units may be equidistantly spaced from one another and each magnetic unit contains a north and south pole. Gear train configurations may be constructed by utilizing gears having similarly spaced magnetic units where inversely aligned magnetic units attract one another to facilitate gear rotation.
Abstract: A transmission mechanism for converting a rotary movement into a translatory movement includes an internal and an external coupling member which have cooperating double thread systems made of a magnetizable material. The external coupling member includes a series of permanent magnets which are polarized in an axial direction and are provided at regular intervals between the individual threads of the thread system so that the individual threads each form a common pole shoe for the permanent magnets providing a maximum magnetic flux density along the portion of the thread system containing the permanent magnets. The presence of a non-magnetizable material between the threads provides that the mutually facing walls of the coupling members are smooth, and a static gas bearing can be applied between these walls.
Abstract: The invention relates to a magnetic drive device enabling a member placed one side of a non-magnetic wall to be driven by a rotary drive shaft placed on the other side of the wall. The driven member is mounted to rock about an oscillation axis orthogonal to the axis of rotation of the drive shaft and carries an axially-magnetized magnet whose outside surface has a right cross-section in the plane containing the oscillation axis and the axis of rotation of the drive shaft that is in the form of a circle centered on the oscillation axis. The drive shaft carries an axially-magnetized magnet offset from the axis of the drive shaft.
March 23, 1993
Date of Patent:
October 25, 1994
Societe d'Applications Generales d'Electricite et de Mecanique Sagem
Abstract: Movement in a pressurized environment is transmitted to a non-pressurized environment by means of a strong magnetic coupling whereby linear movement of a magnet in a pressurized environment causes linear movement of a surrounding magnet which is in a non-pressurized environment. Because of the strong magnetic coupling, the surrounding magnet is used to drive a linear to rotary motion converter. In the preferred embodiment, the pressurized environment is within a screw compressor.
Abstract: A magnetic transmission is provided which incorporates a first rotatable member that is generally annular in shape and provided with a plurality of magnetic poles in which the plurality of magnetic poles comprise alternating polarities. A second rotatable member is similarly provided with a plurality of alternating magnetic poles. Both the first and second rotatable members are supported for rotation about individual axes and, preferably, are arranged in concentric and coaxial relation with each other. One of more third rotatable members are also provided with magnetic poles having alternating polarity and supported for rotation about individual axes. These third rotatable members are disposed radially between the first and second rotatable members and are arranged in noncontact magnetic torque transmitting relation with both the first and second rotatable members. Any of the first, second or third rotatable members can be provided with connection to a driving force, such as a motor.
Abstract: A toy having a movable element is provided with a magnetic actuator which includes a magnet that is placed in proximity to a magnetically attractable component of a transmission disposed within the toy for transmitting power from a motor to the movable element of the toy. The magnet is embedded in a play piece which is placed on the toy on a designated area in proximity to the magnetically attractable component.
Abstract: A multiple magnet drive pump is disclosed, which includes a driving magnet having opposite polarities circumferentially spaced apart from each other, a plurality of driven magnets on a circumference of the driving magnet for rotation in a non-contact state therewith, and a plurality of pump sections each having the driven magnet incorporated into a rotor for a pumping operation.
Abstract: An ultrasonic endoscope includes an operation section and an insertion section extending therefrom. A driving member having a magnet is disposed in the distal end of the insertion section to be rotatable. The member is rotated by a motor through a transmission shaft. An ultrasonic scanning unit is removably attached to the distal end of the insertion section. The unit has a casing in which a scanning chamber filled with a liquid ultrasonic transmission medium is defined. A ultrasonic generator is disposed in the casing. A rotating mirror for reflecting the ultrasonic waves generated by the generator is rotatably arranged in the chamber. A driven member is rotatably arranged in the chamber and coupled to the mirror. The driven member has a magnet magnetically connected to the magnet of the driving member so that it rotates as the driving member rotates.
Abstract: A magnetic speed device includes a rotatable driving shaft and a driven shaft also rotatable about an axis. A stationary pole includes a plurality of pole elements, each having at least one stationary pole surface. The pole elements are circumferentially arranged around the axis. A rotor is operatively coupled to the driven shaft for rotation with the driven shaft about the axis. The rotor includes a plurality of circumferentially arranged rotor pole surfaces. The number of rotor pole surfaces is different from the number of stationary pole surfaces. The rotor pole surfaces are disposed in a spaced, generally opposed relation to the stationary pole surfaces, and define a series of air gaps therebeween. A magnet is mounted for rotation with the driving shaft for supplying a magnetic flux to a flux path which includes successive, adjacent pairs of pole elements, the rotor, and the air gaps.
Abstract: In this gearless, induction-type planetary reducing coupling, electric currents induced in the collars of the driving rotor react with the inductive magnetic field carried by the self-excited planet wheels causing the planet wheel hubs to roll along circular tracks. Skidding is prevented by similar electromagnetic interaction in other, stationary rings. Said rolling action drives planet wheel carriers attached to the output shaft, effecting a power take-off with speed reduction from a very high rotational speed. The device is thus suitable for miniature turbines, whether driven by gas or steam, operating too fast for mechanical gear trains, and can be used to manufacture low-cost turbomotors and turbogenerators, for example using existing turboblowers converted into gas turbines by adding a combustion chamber and burner; this coupling, being reversible, serves as the starter therein.
Abstract: A ball-retaining structure in a power transmission apparatus for transmitting power by means of magnetic balls arranged between non-magnetic rotating bodies is disclosed, in which a magnet or magnets are arranged within either one of the rotating bodies in the vicinity of the balls.
Abstract: An improved stepless power transmission apparatus of the type utilizing magnetic force for making an operative connection between a driving pulley and a driven pulley. The apparatus essentially comprises a primary shaft operatively connected for rotation to a prime mover and having a spirally extending groove formed thereon, a disc-shaped driving pulley displaceably fitted onto the primary shaft in operational engagement with the spirally extending groove, an expansive spring for causing the driving pulley to be normally urged in a direction away from the proper input end of the primary shaft, a truncated cone-shaped driven pulley whose outer conical surface is adapted to come in rolling contact with the peripheral surface of the driving pulley and a secondary shaft made integral with the driven pulley and operatively connected to a power consuming machine or apparatus via a universal joint.
Abstract: A hand held device with built-in motor for rotational drive of small tools. The hand held device includes an outer housing consisting of a larger diameter rear part which contains an electric driving motor, an intermediate part of small diameter which contains motion transmitting means, and a front part in which is mounted a holder for the tool to be driven. The electric driving motor is a brushless motor having a rotor encapsulated in a sealed insulating enclosure and includes permanent magnets covered with a layer of conducting metal and a stator made up of multi-phase winding coils embedded in a molded plastic material. The motion transmission means consists of non-contacting magnetic coupling means.
October 8, 1982
Date of Patent:
December 4, 1984
Kollmorgen Technologies Corporation
Pierre R. Tardieu, Yves H. Mulet-Marquis
Abstract: A propulsion system for converting rotary motion into unidirectional motion and consisting of a frame, a pair of counterrotating lower members rotatably mounted to the frame and containing damping elements, a pair of upper members containing damping elements and rotatably mounted to the frame and positioned above the lower members, each at an angle to the lower member so that each contacts a surface of the member below it at a single point, and a motor and drive train for driving the lower members. Each lower member includes a pair of studs mounted at its periphery which engage radially extending posts mounted to its corresponding upper cylinder so that rotation of the lower member causes the upper member to rotate in the same sense and at the same angular velocity. The superposition of the damped upper members upon the damped lower members generates unbalanced centrifugal forces which create a constant unidirectional resultant force.
Abstract: An improved star guard mechanism for protecting the haul rope of a ski lift system from deropement from the system's carrying sheaves. The guard mechanism is constricted with a guard plate having four radial fingers arranged to cooperate with the cross arm connector of a lift chair gondola or other carrier to rotate the guard plate adjacent the rope carrying sheaves in a turnstile manner providing continuous protection from deropement by at least one of the fingers of the star guard mechanism.
Abstract: The disclosure is directed to an angle adjusting arrangement for mirror for use in a motor vehicle and the like, which is free from variations due to atmospheric temperatures, in the state of magnetic coupling between driving mechanisms and the mirror so as to achieve a predetermined coupled state for positive operations at all times, and is also capable of manual adjustments as desired, without a possibility of any damage to the arrangement.
Abstract: A play-free precision drive apparatus is disclosed which comprises a rotatable drive element (2, 20) for driving a driven element (8, 21), a biasing element (12, 26) for urging the driven element (8, 21) into engagement with the drive element (2, 20), and two rotatable support elements (11, 22) abutting the drive element (2, 20) along its periphery for holding the drive element (2, 20) against the driven element (8, 21). The support elements (11, 22) are positioned such that the centers of the support elements (11, 22) and the center of the drive element (2, 20) define an angle (A.sub.1, A.sub.21) of less than 180.degree. having its apex at the center of the drive element (2, 20) and such that the centers of the support elements (11, 22) define a line (L.sub.3, L.sub.23) parallel to a tangent to the drive element (2, 20) which passes through a contact point between the drive element (2, 20) and the driven element (8, 21).
Abstract: A friction gear permanent magnetic entrainment means for rolling transmission of motion in combination with a magnetic-technical system having one magnetic circuit comprising at least two magnets and at least one operating air gap, including a frame being composed of symmetrically arranged permanent magnets and symmetrically arranged mild iron or steel parts, with the mild iron or steel parts arranged between analogous poles of the magnets forming central frontal surfaces drawn into the interior of the frame, which central frontal surfaces are opposing one another forming an operating air gap with opposite polarities in the direction of magnetizing.