Adjustable Air Gap Patents (Class 336/134)
  • Patent number: 10600552
    Abstract: The invention is directed to a surface mountable reactor including: a coil 60; a first magnetic core 5 including an axial portion 5a around which the coil 60 is disposed and flange portions 5b and 5c at both ends thereof; a second magnetic core 10 disposed outside the coil 60 to connect the flange portions of the first magnetic core 5; and a resin mount 30 disposed outside the coil 60, wherein the second magnetic core 10 includes a plurality of components 10a and 10b separable toward outside the coil 60, the circumference of the coil 60 is surrounded by the second magnetic core 10 and the resin mount 30, and the coil 60 has end portions 65 disposed outside the resin mount 30, and to a method for fabrication thereof.
    Type: Grant
    Filed: March 28, 2016
    Date of Patent: March 24, 2020
    Assignee: HITACHI METALS, LTD.
    Inventors: Mutsuhito Sakaguchi, Akira Itoh, Ryouji Zenitani
  • Patent number: 10593455
    Abstract: A reactor includes a plurality of iron cores and a winding wound on any of the plurality of iron cores; a gap is formed between two iron cores facing against each other; a gap-facing surface of one iron core has an area larger than that of a gap-facing surface of the other iron core.
    Type: Grant
    Filed: December 15, 2017
    Date of Patent: March 17, 2020
    Assignee: FANUC CORPORATION
    Inventor: Masatomo Shirouzu
  • Patent number: 10251780
    Abstract: A three-coil electromagnetic induction power transfer system is disclosed for epiretinal prostheses and other implants. A third, buffer coil is disposed between an external transmitting coil and a receiver coil buried within the body to improve efficiency and robustness to misalignments. One or more of the coils can be manufactured using micromechanical machining techniques to lay out conductors in a ribbon of biocompatible insulator, folding lengths of the insulated conductor traces longitudinally over one another, and then spiraling them into a ring. The traces change axial position in the ring by shifting across fold lines. One or more U-shaped sections on the traces can be folded so that adjacent traces can project opposite one another, lengthening the resulting ribbon that can be wound into a coil.
    Type: Grant
    Filed: June 24, 2015
    Date of Patent: April 9, 2019
    Assignees: California Institute of Technology, University of Southern California
    Inventors: Yu-Chong Tai, Yu Zhao, Mark S. Humayun, James D. Weiland
  • Patent number: 10102952
    Abstract: An adjustable inductor and a method of assembling such an inductor. The inductor may include a toroidal core defining a pair of gaps to provide a removable core section, the core also including a rigid core section; compressible gap material positioned in the gaps; windings wound on the rigid core section; and force-applying structure operable to apply a force to the removable core section to adjust the gaps and thereby the inductance.
    Type: Grant
    Filed: May 5, 2015
    Date of Patent: October 16, 2018
    Assignee: Hubbell Incorporated
    Inventor: Kenneth E. Pagenkopf
  • Patent number: 10094363
    Abstract: A system for the recovery of parasitic energy loss in a vehicle includes a magnet and coil arrangement operatively and movable coupled with respect to one another, such that motion of the drive train of the vehicle with respect to the frame components causes relative motion therebetween to thereby induce an electrical current in the coil which may be used or stored in the vehicle.
    Type: Grant
    Filed: June 26, 2017
    Date of Patent: October 9, 2018
    Inventor: Yanir Nulman
  • Patent number: 10044293
    Abstract: An inverter includes transformers having identical characteristics. Exciting windings of the transformers are connected in parallel so that the transformers are excited simultaneously. Output windings of the transformers are connected in series so that waveforms of output voltages of the output windings are time-synchronized. Each transformer includes a core having an identical shape and including an inner leg having an independent closed magnetic circuit. The excitation winding and the output winding are wrapped around the inner leg of the core in layers. The inner leg of the core has a gap whose size is steplessly adjustable in a state where the excitation current is applied to the excitation winding. The size of the gap is adjusted to regulate exciting inductances of the transformers to a same predetermined value.
    Type: Grant
    Filed: March 11, 2014
    Date of Patent: August 7, 2018
    Assignee: Ricoh Company, LTD.
    Inventor: Hisahiro Kamata
  • Patent number: 9966797
    Abstract: Inductive power transfer apparatus has a first magnetic coupling structure and a second magnetic coupling structure, the structures being adapted to generate and/or receive magnetic flux to thereby transfer power inductively, the first structure comprising a substantially circular coil, and the second magnetic structure comprising an arrangement of at least two coils associated with a magnetically permeable core.
    Type: Grant
    Filed: July 9, 2012
    Date of Patent: May 8, 2018
    Assignee: Auckland UniServies Ltd.
    Inventor: Grant Anthony Covic
  • Patent number: 9297911
    Abstract: An electronic device to simply and efficiently measure energy of incident photons in a very short time and with a very high count rate and high precision, starting from current pulses from an ionizing electromagnetic radiation detector, the electronic device including an analog delay line with switched capacitors with controlled loss at an output from a charge preamplifier.
    Type: Grant
    Filed: October 4, 2012
    Date of Patent: March 29, 2016
    Assignee: Commissariat a l'energie atomique et aux energies alternatives
    Inventors: Jean-Pierre Rostaing, Patrice Ouvrier-Buffet
  • Patent number: 9024714
    Abstract: A static apparatus includes an iron core which includes a plurality of magnetic plates stacked in one direction and in which a shaft portion having a main surface and a side surface is formed, and a coil wound around the shaft portion. Slits extending in an axial direction of the shaft portion are formed in at least a surface layer magnetic plate constituting the main surface, of the plurality of magnetic plates. Some of the slits are formed in the main surface, at an end portion close to the side surface, at a predetermined formation density. The formation density of the slits is highest at the predetermined formation density, and is reduced as at least one of a minimum distance from the side surface within the main surface and a distance from the main surface on a side close to the slits in the stacking direction is increased.
    Type: Grant
    Filed: October 22, 2010
    Date of Patent: May 5, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tetsuya Matsuda, Ryuichi Nishiura, Hiroyuki Akita, Takeshi Imura, Yasuo Fujiwara, Yoshinori Shimizu, Kazuaki Aono
  • Patent number: 8854170
    Abstract: An energy conversion system includes a first core section, a tank, a flexible structure, and an output coil. The tank contains a volume of fluid having a high magnetic permeability. The flexible structure is fluidly coupled to the tank and movable from a retracted to an extended position in response to the injection of the fluid from the tank. The output coil is in electrical communication with the first core section. A charging station includes a second core section and an input coil. The first and second core sections are in alignment to define an air gap therebetween. The air gap is reduced when the flexible structure is in the extended position within the air gap such that the flexible structure transmits magnetic flux between the second core section and the first core section. The magnetic flux in the first core section induces electrical current in the output coil.
    Type: Grant
    Filed: May 20, 2011
    Date of Patent: October 7, 2014
    Assignee: GM Global Technology Operations LLC
    Inventors: Edward D. Tate, Jr., Alan G. Holmes
  • Patent number: 8350655
    Abstract: Axisymmetric solid of revolution derivable from section at FIG. 5 is generally toroidal with electric current(s) in windings 110, 160 preferably flowing circumferentially along major circle(s) during power coupling device operation. Current(s) in windings 110, 160; current(s) in half-shields 120, 170; and the volume of space swept out by shield airgap(s) 101 emerge from plane of paper perpendicularly at FIG. 5 but as these emerge therefrom they curve to follow toroidal major circle(s). Cores 115, 165 preferably shunt and align magnetic flux such that magnetic field lines escape therefrom primarily only in region(s) of core airgap(s) and such that magnetic flux loops lie in planes of toroidal minor circle(s).
    Type: Grant
    Filed: January 29, 2007
    Date of Patent: January 8, 2013
    Assignee: Analogic Corporation
    Inventor: John M. Dobbs
  • Patent number: 8319592
    Abstract: A variable inductor includes: a first coil; a second coil which emanates a magnetic flux in a cancelling direction with respect to the magnetic flux generated in the first coil; a plate-shaped movable core positioned between the first coil and the second coil for carrying out opening & closing operation; and first and second magnetic cores, having a closed magnetic-path structure which involves the first coil, the second coil and the movable core. The first magnetic core includes a first center-core portion around which the first coil is wound and the second magnetic core includes a second center-core portion around which the second coil is wound.
    Type: Grant
    Filed: June 6, 2011
    Date of Patent: November 27, 2012
    Assignee: Sumida Corporation
    Inventor: Mitsugu Kawarai
  • Patent number: 7786833
    Abstract: An edgewise coil which includes a non-circular cross-sectional shaped conductor having a cross-sectional shape defined by a pair of first and second long sides and a pair of first and second short sides, the shaped conductor wire being laminated while being bended with using the first short side as a bending fulcrum so as to form a plurality of laminated wire layers having a rectangular shape in a plan view, wherein the pair of long sides include, in a longitudinal cross section in a pre-bending-process state before the shaped conductor wire is bended, a pair of straight-line regions extending from both ends of the second sides so as to be parallel to each other and a pair of tapered regions extending between the straight-line regions and the first short side, and the pair of tapered regions, in a longitudinal cross section in the pre-bending-process state, come closer to each other as they approach the first short side.
    Type: Grant
    Filed: July 11, 2006
    Date of Patent: August 31, 2010
    Assignee: Suncall Corporation
    Inventor: Takao Murakami
  • Patent number: 6891460
    Abstract: A rotor transformer positioning mechanism permitting automatic positioning of a rotor transformer, having a first winding, relative to a rotor stack, having a second winding, mounted on a common rotary shaft to thereby permit a crossover having a predetermined length to be installed between the first and second windings includes a crossover positioning cutout disposed in a first flange of the rotor transformer. In an exemplary case, the rotor transformer includes the first flange and a second flange disposed on opposite ends of the first coil, and the second flange is proximate to the crossover. A method of assembling a rotating machine using the rotor transformer positioning mechanism is also described.
    Type: Grant
    Filed: April 1, 2003
    Date of Patent: May 10, 2005
    Assignee: Minebea Co., Ltd.
    Inventors: Tsuneo Tezuka, Genta Yoshii
  • Patent number: 6847283
    Abstract: The invention concerns an inductive transmitter comprising two coils (1, 2), each with one core (3, 4). The two cores (3, 4) are capable of being moved relative to each other. Two systems are integrated in the transmitter that make it possible to simultaneously transmit data and/or energy, as well as the position of the two cores (3, 4) relative to each other. Finally, the transmission of data and/or energy takes place by means of induction, and the determination of the position of the two cores (3, 4) relative to each other takes place via a measurement of the magnetic field that exists between the two coils (1, 2).
    Type: Grant
    Filed: March 21, 2001
    Date of Patent: January 25, 2005
    Assignee: Robert Bosch GbmH
    Inventor: Juergen Schirmer
  • Patent number: 6657528
    Abstract: A slope gap inductor for reducing line harmonic currents. The slope gap inductor comprises a first inductor core portion, and a second inductor core portion positioned relative to said first inductor core portion so as to form an inductor gap, wherein the second inductor core portion includes a sloped gap surface that forms a sloped gap portion of the inductor gap having a varying gap height, and wherein the sloped gap surface has a slope value that is selected so that the slope gap inductor has a selected inductance value responsive to a level of current in the inductor.
    Type: Grant
    Filed: June 29, 2001
    Date of Patent: December 2, 2003
    Assignee: Astec International Limited
    Inventor: Allen Tang
  • Patent number: 6597271
    Abstract: An electromagnetic apparatus having an adjusting effective core gap includes: (a) an electrical winding; and (b) a ferrous core situated proximal with the electrical winding. The core has a first terminus and a second terminus arranged in spaced relation to establish a gap distance between the termini in a region in substantial register with the termini. The winding and the core cooperate to establish an inductance related with an electrical current applied to the winding. At least one terminus of the termini has a configuration responsive to varying the current by effecting selective local saturation of successive portions of the at least one terminus for successive values of the current. The selective local saturation establishes successive new effective gap distances. Each respective new effective gap distance is appropriate for establishing a successive new optimum inductance for the current value then extant.
    Type: Grant
    Filed: October 12, 2001
    Date of Patent: July 22, 2003
    Inventors: Galliano Riccardo Busletta, Robert Joseph Roessler, Karim Nashaat Wassef, Matthew Anthony Wilkowski
  • Patent number: 6392521
    Abstract: A variable inductance transformer includes a core defining a gap between opposing first and second ends. A primary winding and at least one secondary winding are coupled to the core. The secondary winding is provided for stepping up the voltage across the primary winding. A carriage assembly includes a magnetic shunt movable against the core and variably across the gap. The magnetic shunt has a width at least as wide as the gap for moving the shunt to a predetermined position along the core in a range from an uncovered position not overhanging the gap, throught intermediate positions overhanging the gap, to a covered position where the shunt bridges the gap. A control circuit controllably energized a motor to move the carrriage assembly and position the magnetic shunt against the core for adjustably varying the inductance of the secondary winding a to maintain a high output voltage of the transformer for a given resistive supply current.
    Type: Grant
    Filed: October 12, 2000
    Date of Patent: May 21, 2002
    Assignee: Clinton Instrument Company
    Inventor: Henry H. Clinton
  • Patent number: 6211765
    Abstract: The present invention provides a coil device including magnetic cores having gaps at positions of at least opposing to each other in a magnetic path to be formed and a coil wound to include at least one of said gaps and its improvement consists in the fact that a shape of at least one of the opposing magnetic cores forming; the gaps around which said coil is wound is made as a curve of logarithmic function from its base end to its extreme end and its most extreme end is provided with a gap adjusting flat surface. With such an arrangement as above, the present invention provides a coil device capable of reducing a leakage magnetic flux generated around the gaps, preventing an abnormal generation of heat of the coil and further preventing a bad influence of noise against a peripheral apparatus.
    Type: Grant
    Filed: April 8, 1996
    Date of Patent: April 3, 2001
    Assignee: TDK Corporation
    Inventors: Shinichiro Ito, Yukiharu Kinoshita
  • Patent number: 6101371
    Abstract: An article comprising a micro-machined, passively self-assembling inductor is disclosed. The inductor is fabricated using MEMS technology and advantageously utilizes materials compatible with CMOS such that inductor is monolithically integrable with a CMOS chip. The inductor includes passive self-assembly means by which the inductor loop is moved away from an underlying substrate, typically silicon, in the final steps of inductor assembly. Such passive self-assembly does not require separate actuation or monitoring steps.
    Type: Grant
    Filed: September 12, 1998
    Date of Patent: August 8, 2000
    Assignee: Lucent Technologies, Inc.
    Inventors: Bradley Paul Barber, Nathan Belk, David J. Bishop, Peter L. Gammel
  • Patent number: 5999077
    Abstract: A voltage controlled variable inductor provides a rapidly variable inducte for high power frequency dependent circuit applications. Continuously variable inductance values having a high Q factor are obtainable with the application of only a minimal amount of control power.
    Type: Grant
    Filed: December 10, 1998
    Date of Patent: December 7, 1999
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Russell E. Hammond, Edward F. Rynne, Leopold J. Johnson
  • Patent number: 5903205
    Abstract: A group of secondary windings are distributively provided on a stator over a predetermined range, and the respective inductance of the secondary windings in the group is set in such a manner to present predetermined inductance distribution. A rotor has an eccentric shape so as to cause variations in magnetic coupling at individual poles of the stator in response to its current rotational position. By combined use of the magnetic coupling variations between primary and secondary windings on the stator and the predetermined inductance distribution of the secondary windings, high-accuracy detection of a rotational position is achieved with a simple structure. A plurality of primary windings may be set so as to present predetermined inductance distribution.
    Type: Grant
    Filed: August 7, 1996
    Date of Patent: May 11, 1999
    Assignee: Atsutoshi Goto
    Inventors: Atsutoshi Goto, Yasuhiro Yuasa, Shuichi Tanaka, Nobuyuki Akatsu, Kazuya Sakamoto, Hiroshi Sakamoto
  • Patent number: 5760670
    Abstract: The present invention relates to a tranformer core structure, which includes a rectangular frame core having two long sides and two short sides, with one short side having a recessed part and the other short side being closed to form a junction surface of magnetic path; and a strip core disposed in the rectangular frame core through the recessed part, and having a length similar to that of said long side of said rectangular frame core, but having a width slightly less than that of said recessed part, wherein adjustment of the inductance of the structure is accomplished by moving said strip core along said recessed part to adjust a gap between one end of said strip core and said junction surface of magnetic path.
    Type: Grant
    Filed: January 31, 1997
    Date of Patent: June 2, 1998
    Assignee: Delta Electronics, Inc.
    Inventors: Ming Yeh, Y. J. Chen, H. B. Chan, Antony Du, Albert Chang
  • Patent number: 5701114
    Abstract: A Rotary Variable Differential Transformer, having a short axial length, small diameter, and a wide angle, linear output range, is provided. The Rotary Variable Differential Transformer (RVDT) comprised of a housing, a hollow cylindrical coil form made of non-magnetic, non-conductive material, about which a first and second secondary coils, adjacent to each other, are circumferentially wound. A primary coil is circumferentially wound about a segment of said first secondary coil, and about a segment of said second secondary coil.An elongated ferromagnetic core is disposed within the hollow coil form. The core is an axial section of a ferromagnetic cylinder which serves to couple said primary coil to said secondary coils.The output voltage measured across said secondary coils terminals is indicative of the angular position of said ferromagnetic core relative to the coil form assembly.
    Type: Grant
    Filed: July 30, 1996
    Date of Patent: December 23, 1997
    Inventor: Jacob Chass
  • Patent number: 5382937
    Abstract: A coil device which can accurately maintain the proportion of voltage caused by the change of the current flowing in a coil device, wherein the outside magnetic substance and the coil are fixed during an assembly of the coil device so that inside magnetic substance can be adjustably moved, or the outside magnetic substance and the inside magnetic substance are fixed so that the coil can be adjustably moved, or only the outside magnetic substance is fixed so that the coil and the inside magnetic substance can be adjustably moved therein. In addition, the coil device produces only small errors in inductance and a minimum leakage flux.
    Type: Grant
    Filed: July 30, 1992
    Date of Patent: January 17, 1995
    Assignee: TDK Corporation
    Inventors: Yutaka Saitoh, Shinichirre Stro, Yukiharu Kimoshita
  • Patent number: 5347255
    Abstract: The variable inductance coil device having an outer magnetic member, a bobbin member, a coil member and an inner magnetic member. A female thread (thread portion) is provided in the inner periphery of the tube of the bobbin member, and a male thread (thread portion) which meets with the female thread of the tube is provided in the outer periphery of the inner magnetic member. The inductance varies accurately by rotating and moving the inner magnetic member. Since the outer magnetic member is formed in the closed shape, the leakage flux can be lowered.
    Type: Grant
    Filed: February 17, 1993
    Date of Patent: September 13, 1994
    Assignee: TDK Corporation
    Inventors: Yutaka Saitoh, Shinichiro Ito, Yukiharu Kinoshita
  • Patent number: 5347257
    Abstract: A variable inductor includes at most one coil of electrically conductive material and at most two distinct, separately formed portions of magnetic core material positioned to conduct magnetic flux resulting from passage of electrical current through the coil. At least one of the portions of magnetic core material is located at least partially within a space surrounded by the coil and is movable with respect to the coil. A control device is attached to the movable portion of magnetic core material in a manner such that the movable portion can be moved in its entirety, by manipulating the control device, to change the configuration of a gap within the space surrounded by the coil and defined in part by the movable portion, to vary thereby the inductance of the coil.
    Type: Grant
    Filed: May 29, 1992
    Date of Patent: September 13, 1994
    Assignee: Stocker & Yale, Inc.
    Inventor: George E. Biegel
  • Patent number: 5345209
    Abstract: The present invention is comprised of an outside magnetic substance forming an endless loop, an inside magnetic substance formed inside of said outside magnetic substance and coil wound on the periphery of said inside magnetic substance. In a coil device of the present invention with gaps between both ends of said outside magnetic substance and said inside magnetic substance, notches or holes are provided in said outside magnetic substance for the purpose of inserting insert a jig therein so as to adjustably move the position of said inside magnetic substance, wherein said notches or holes correspond to the gaps provided in both ends of said inside magnetic substance. In said coil device, the inside magnetic substance can be adjusted and moved its position by pressing a bar-like jig through the notches or the holes provided in the outside magnetic substance. Thus, it has become possible to adjust the value of the inductance by about 25% experimentally.
    Type: Grant
    Filed: July 30, 1992
    Date of Patent: September 6, 1994
    Assignee: TDK Corporation
    Inventors: Yutaka Saitoh, Shinichiro Ito, Yukiharu Kinoshita
  • Patent number: 5015998
    Abstract: A position sensor includes of two primary sense windings for establishing a forward or drive field, two secondary sense windings in which a voltage may be induced in the presence of the drive field, and at least one conductive screen capable of blocking the magnetic coupling between the primary and secondary sense windings. When the screen blocks the magnetic coupling between one pair of sense windings to the same extent that ti does between the other pair of sense windings, the sensor circuitry generates a marker signal to indicate the position of the screen.
    Type: Grant
    Filed: August 9, 1989
    Date of Patent: May 14, 1991
    Assignee: Kollmorgen Corporation
    Inventors: George H. Ellis, James C. Kirby
  • Patent number: 4885445
    Abstract: A high-frequency transformer for a microwave oven comprises: an E-shaped first core of ferrite of a low-voltage side; a primary winding wound around the first core over a coil bobbin; an E-shaped second core of ferrite of a high-voltage side disposed in opposition with the first core with a specific gap therebetween; a gap-filling insulation material interposed between the first and second cores; a secondary winding wound around the second core; and a grounding plate connected electroconductively between the first core and a bottom plate of the microwave oven, wherein the distance between the primary winding and the first core is greater than the gap between the two cores.
    Type: Grant
    Filed: December 8, 1988
    Date of Patent: December 5, 1989
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Hisaya Taniguchi
  • Patent number: 4806863
    Abstract: Apparatus for testing for flaws in conductive objects which includes a coil of electrically conducting wire and an associated flux concentrator of electromagnetically active material which is disposed radially from the coil, sized and shaped to provide a desired resolution of flaw detection and provides close coupling between the coil and conductive object. An associated bridge circuit detects changes in the coil's impedance, caused by flaws in the object, and activates a display to visually indicate a change in impedance.
    Type: Grant
    Filed: October 17, 1986
    Date of Patent: February 21, 1989
    Assignee: Westinghouse Electric Corp.
    Inventor: John K. White
  • Patent number: 4764744
    Abstract: A static trip overload relay includes a plurality of phase current sensing transformers having two-piece cores. One core piece of each transformer core is positionally mounted by the relay housing, while the other piece is positionally mounted by a carrying case movably mounted within the housing. By varying the case position within the housing, the air gaps between the two core pieces of each transformer core are correspondingly and concurrently varied pursuant to calibrating the relay to operate at any one of a range of circuit current ratings.
    Type: Grant
    Filed: December 17, 1987
    Date of Patent: August 16, 1988
    Assignee: General Electric Company
    Inventors: Robert P. Alley, Fred G. Turnbull
  • Patent number: 4642595
    Abstract: A contactless electric control handle having a field coil for forming an electro-magnetic field, inductive pick-up coils angularly spaced apart around the axis of the field. The rod of the control handle constitutes the core of the field coil. The field coil and the pick-up coils have the shape of annular, concentric conductors, whereas ferrite is applied to the rod in order to employ high frequencies up to 1 MHz.
    Type: Grant
    Filed: April 24, 1985
    Date of Patent: February 10, 1987
    Assignee: Inductive Control Systems B.V.
    Inventor: Geurt J. Ruumpol
  • Patent number: 4542062
    Abstract: A magnetic recording medium comprises a magnetic alloy layer on a substrate wherein said magnetic alloy layer is made of 70-90 wt. % of Co and 30-10 wt. % of at least one of Si, Sb, Li, V, Ta, Ge and Pt and a magnetization axis of said magnetic alloy is substantially vertical to said layer.
    Type: Grant
    Filed: January 20, 2982
    Date of Patent: September 17, 1985
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Kazuo Takada, Seitoku Saito
  • Patent number: 4529956
    Abstract: A pot-core transformer with a magnetic shunt variable to add the function of a variable series inductor independent of the transformer.
    Type: Grant
    Filed: August 16, 1984
    Date of Patent: July 16, 1985
    Assignee: Honeywell Inc.
    Inventor: Jay W. Atherton
  • Patent number: 4464645
    Abstract: An angular displacement transducer of the variable reluctance type is disclosed. It utilizes two relatively rotatable rotors with two sets of magnetic circuits and a coil associated with each magnetic circuit. Each set of magnetic circuits has a set of magnetic cores, one-half the cores on one rotor and one-half on the other rotor. A pair of cores in the first set, one on each rotor, coact with each other to provide a first variable reluctance magnetic circuit which is magnetically linked with the first coil and which has a reluctance that varies with relative rotation of the rotors. A pair of cores in the second set, one on each rotor, coact with each other to provide a second variable reluctance magnetic circuit which is magnetically linked with the second coil and which has a reluctance that varies with relative rotation of the rotors.
    Type: Grant
    Filed: August 6, 1982
    Date of Patent: August 7, 1984
    Inventor: Peter Norton
  • Patent number: 4462015
    Abstract: A joystick mechanism generates output signals corresponding to the X and Y components of a manual command. A transducer mounted in a housing includes a ferromagnetic vane member connected to the bottom of a handle extending into the housing. The transducer also includes a stator member having nine legs mounted in a 3 by 3 rectangular array. The primary winding is wound around the central leg. Two pairs of opposed secondary windings are wound around each set of three outside legs, wherein the X-axis is disposed between one pair of secondary windings and the Y-axis is disposed between the other pair of secondary windings. Primary windings may be wound around the central three legs to form a symmetrical cruciform. The handle can be fixed to a deformable top plate or be supported at a rigid top plate by a ball and socket.
    Type: Grant
    Filed: February 4, 1982
    Date of Patent: July 24, 1984
    Inventor: Yishay Netzer
  • Patent number: 4446741
    Abstract: A vibration transducer for measuring vibrations and shocks, especially vibrations which occur during the operation of machines and mechanical equipment. The induction vibration transducer comprises a permanent magnet movably mounted with respect to at least one induction coil. The movable magnet is provided in the axial cavity of a bushing having disc-like permanent magnets at its opposite ends, the movable magnet being repelled by the fixed permanent magnets. Around the bushing between the axially inner pole pieces of the fixed permanent magnets and the ends of the movable permanent magnet there are pseudobifilar wound induction coils. One or both of the confronting surfaces of the bushing and the movable permanent magnet is provided with an anti-friction covering or coating. The vibration transducer of the invention has relatively small dimensions, withstands moderately high temperature, and is virtually unaffected by temperature changes.
    Type: Grant
    Filed: June 1, 1981
    Date of Patent: May 8, 1984
    Assignee: Prvni brnenska strojirna, narodni podnik
    Inventors: Jurij Sirokorad, Jiri Vecera
  • Patent number: 4445103
    Abstract: A rotary differential transformer is provided which has a constant amplitude output the phase angle of which varies with the angular displacement of a rotor. The rotor contains a pair of core segments of magnetic material which serve to couple portions of first and second primary coils to a secondary coil. The primary coils are connected to AC sources 90.degree. out of phase with each other.
    Type: Grant
    Filed: August 10, 1983
    Date of Patent: April 24, 1984
    Assignee: Pickering & Company, Inc.
    Inventor: Jacob Chass
  • Patent number: 4434412
    Abstract: Contactless, electric control-handle comprising a field coil provided with a core for producing an alternating, electro-magnetic field, pairwise series connected, inductive pick-ups angularly spaced apart and each having a core, and an actuating-rod subjected to a bias stress directed towards a neutral position and connected with a core of the field coil to affect the alternating, electro-magnetic field such that there is a linear relation between the displacement of the actuating rod and the output signal of the inductive pick-ups.
    Type: Grant
    Filed: April 17, 1981
    Date of Patent: February 28, 1984
    Assignee: Inductive Control Systems B.V.
    Inventor: Geurt J. Ruumpol
  • Patent number: 4401986
    Abstract: A non-contacting position sensor has an exciting coil disposed in a plane and has a sensing coil located in an intersecting plane so that portions of the sensing coil are disposed symmetrically around a portion of the exciting coil in mutually inductive relation to that portion of the exciting coil. Ferrite means magnetically shield those sensing coil portions from other portions of the exciting coil and housing means are provided to mount the sensor so that those coil portions are conveniently positioned for relative movement with respect to magnetically permeable or electrically conductive inductance-modifying means on an object whose position is to be monitored. Movement of the inductance-modifying means as the object moves then modifies the mutual inductance between the respective sensing coil portions and the exciting coil portion so that, when the exciting coil is driven, the sensing coil provides a signal which is accurately and reliably representative of the object position.
    Type: Grant
    Filed: December 26, 1979
    Date of Patent: August 30, 1983
    Assignee: Texas Instruments Incorporated
    Inventors: George Trenkler, Lawrence E. Cooper
  • Patent number: 4371116
    Abstract: An alignment system with a variable reactance element is provided for detection of the angular alignment of two variably positionable members. The variable reactance elements form two oppositely varying impedances. A preferred embodiment of the variable reactance element consists of a pair of inductive coils mounted on a core element which forms a flux path for each coil. The core has an integral, deflectable central member which forms a common flux path for both coils. Air gaps within the flux path of each coil are located on either side of a central member of the core. Another variable reactance consists of a first inductive coil having a fixed core element forming a partial flux path for the inductive coil and a movable core element positionable relative to the fixed core element with air gaps between the core elements. A second inductive coil having a similar associated core element from the first coil element.
    Type: Grant
    Filed: January 5, 1981
    Date of Patent: February 1, 1983
    Inventors: David M. Sage, George E. Sage
  • Patent number: 4266732
    Abstract: An alignment system with a variable reactance element is provided for detection of the angular alignment of two variably positionable members. The variable reactance elements form two oppositely varying impedances. A preferred embodiment of the variable reactance element consists of a pair of inductive coils mounted on a core element which forms a flux path for each coil. The core has an integral, deflectable central member which forms a common flux path for both coils. Air gaps within the flux path of each coil are located on either side of the central member of the core. Another variable reactance consists of a first inductive coil having a fixed core element forming a partial flux path for the inductive coil and a movable core element positionable relative to the fixed core element with air gaps between the core elements. A second inductive coil having a similar associated core element is placed opposite the movable core element from the first coil element.
    Type: Grant
    Filed: May 19, 1980
    Date of Patent: May 12, 1981
    Inventors: David M. Sage, George E. Sage
  • Patent number: 4189674
    Abstract: A signal transducing means for receiving input signals and delivering output signals comprising a bistable magnetic device which alters its magnetic state when the density of magnetic flux to which it is subject passes through a predetermined value, and detecting means providing an output signal responsive to a change in magnetic state of the bistable device. A conducting means for magnetic flux subjects the bistable magnetic device to conducted magnetic flux and comprises a first portion providing a path of high permeability and a second portion providing a path having a permeance which is alterable in response to input signals for varying the reluctance of the conducting means and the density of magnetic flux to which said bistable device is subject.
    Type: Grant
    Filed: July 17, 1978
    Date of Patent: February 19, 1980
    Assignee: TRW Inc.
    Inventor: Richard A. Lathlaen
  • Patent number: 4149133
    Abstract: A linear variable differential transformer includes a primary winding and two secondary windings in spaced stacked relation on a core unit. The core unit includes similar cup-shaped pot cores mounted in opposed opening relationship and having abutting cylindrical outer walls and spaced cylindrical inner walls define an annular chamber within which the windings are located. A core axis located within the central air gap between the inner walls and terminates in close relation to the windings. A movable stem couples the core to a pressure diaphragm transducer to locate the core in accordance with pressure.
    Type: Grant
    Filed: October 14, 1977
    Date of Patent: April 10, 1979
    Assignee: Johnson Controls, Inc.
    Inventor: Adolph J. Hilgert
  • Patent number: 4146859
    Abstract: A saturable reactor for correction of pincushion distortion of a TV picture tube raster has, in one form, a magnetically saturable two window core. A single wire control coil is wound transversely around the central leg segment of the core and is connected with the vertical frequency sawtooth driver in a parabolic wave shaping network. A first load coil, wound transversely around one outer core leg, is connected in series circuit with the horizontal frequency sawtooth driver and the horizontal deflection coils. A second load coil is wound around the exterior of the core, in lengthwise embracing relation to its other outer leg, and is connected in series with the vertical deflection coils and also in a phase inverting resonant loop circuit.
    Type: Grant
    Filed: June 21, 1977
    Date of Patent: March 27, 1979
    Assignee: Whitewater Electronics, Inc.
    Inventor: Patric C. Quirke
  • Patent number: 4032874
    Abstract: A reactor core includes a plurality of laminations of trapezoidal shape forming the legs of the core. These legs are arranged in generally rectangular configuration with air gaps provided at the corners of the core. These air gaps extend diagonally of the core legs and are formed between the inclined faces of adjacent ends of the trapezoidal-shaped core legs. End plates each having a longitudinal section extending parallel to and fixed to one of the legs and having flanges at each end of the longitudinal section extending perpendicularly to the longitudinal section are provided for maintaining the legs of the core in assembled relation and for effecting adjustment of the air gaps. The end plates include elongated openings in the flanges thereof for permitting movement of each of the end plates, and the leg to which it is affixed, relative to the remainder of the core for varying the size of the diagonal air gaps.
    Type: Grant
    Filed: August 26, 1975
    Date of Patent: June 28, 1977
    Assignee: General Electric Company
    Inventors: Henry W. Kudlacik, Robert L. Winchester
  • Patent number: 4031496
    Abstract: A variable inductor wherein two closed magnetic circuits each having a predetermined gap in one place are constructed of a movable magnetic core and a fixed magnetic core. When the movable magnetic core is moved, the opposite area between both the magnetic cores in one of the closed magnetic circuits increases, while the opposite area between both the magnetic cores in the other closed magnetic circuit decreases. Thus, the inductances of coils wound around parts of the respective closed magnetic circuits vary complementarily.
    Type: Grant
    Filed: July 3, 1974
    Date of Patent: June 21, 1977
    Assignee: Hitachi, Ltd.
    Inventors: Hideo Fujiwara, Yukio Ichinose, Satoshi Taniguchi, Tsutomu Kobayashi, Kazuo Ichino, Michiyasu Itoh, Yasutaro Uesaka, Fumiyuki Inose, Sadayasu Ueno
  • Patent number: 4006628
    Abstract: A transducer for converting mechanical forces into corresponding electrical signals. In one embodiment, the transducer takes the form of a writing instrument for use in a user identification system whereby the time-varying force between the instrument and a writing surface generates a waveform which is characteristic of the individual doing the writing. The transducer includes first and second core members being interconnected by a resilient member with the core members being operatively coupled to a coil whose inductance varies in accordance with the forces generated during writing. The coil is operatively coupled to an oscillator whose frequency changes in accordance with the varying inductance to produce the waveform.
    Type: Grant
    Filed: November 19, 1975
    Date of Patent: February 8, 1977
    Assignee: NCR Corporation
    Inventor: Gerald A. St. Jacques
  • Patent number: 3979706
    Abstract: An electrical inductance coil, having a central opening therethrough, is surrounded by a spaced shield of magnetic metal, and a screw of magnetic metal is mounted in engagement with one side of the shield for adjustable extension through the central opening in the coil for varying the spacing between the inner end of the screw and the confronting, opposite side of the shield.
    Type: Grant
    Filed: June 26, 1975
    Date of Patent: September 7, 1976
    Assignee: Hull Corporation
    Inventor: Thomas A. Jennings