Coils With Temperature Compensating Means Patents (Class 336/179)
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Patent number: 10794775Abstract: An apparatus for determining and/or monitoring temperature of a medium, comprising at least one temperature sensor and at least two reference elements for in situ calibration and/or validation of the temperature sensor, wherein the first reference element is composed at least partially of a first material, in the case of which at least one phase transition of at least second order occurs at least a first predetermined phase transition temperature in the temperature range relevant for calibration of the temperature sensor, wherein the second reference element is composed at least partially of a second material, in the case of which at least one phase transition of at least second order occurs at least a second predetermined phase transition temperature in the range relevant for calibration of the temperature sensor, and wherein the at least two reference elements are contacted via exactly two connection wires.Type: GrantFiled: June 28, 2016Date of Patent: October 6, 2020Assignee: Endress+Hauser Wetzer GmbH+Co. KGInventors: Alfred Umkehrer, Pavo Vrdoljak
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Patent number: 9490059Abstract: A coil component has a wound coil, a coil magnetic body, and an exterior body. The coil magnetic body has a magnetic core inside winding of the wound coil. The exterior body covers a surface of the coil magnetic body. This coil component has a mount surface, and a thermal conductivity in a direction parallel to a surface of the exterior body is greater than a thermal conductivity in a direction perpendicular to the surface of the exterior body.Type: GrantFiled: September 1, 2014Date of Patent: November 8, 2016Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Shota Nishio, Nobuya Matsutani, Takeshi Takahashi
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Patent number: 9438071Abstract: An information handling system (IHS) includes a base station that has a transmitter coil to generate a magnetic field for charging a portable power source of a battery-powered electronic device. A receiver coil magnetically receives power from the transmitter coil of the base station. A power control module connected to the portable power source and the receiver coil charges the portable power source with the received power. A flexible ferrite shield is positioned on a side of the receiver coil opposite to the transmitter coil to shield the IHS electronics. A pneumatic diaphragm is formed by a portion of the flexible ferrite shield that is positioned for oscillating movement into a center cavity of the receiver coil. A diaphragm actuator is attached to the pneumatic diagram and is responsive to a triggering signal to oscillate the pneumatic diaphragm to disperse thermal energy that is generated by the receiver coil.Type: GrantFiled: February 26, 2015Date of Patent: September 6, 2016Assignee: DELL PRODUCTS, L.P.Inventors: Chris Helberg, Travis C. North, Andrew Sultenfuss, Austin M Shelnutt
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Patent number: 9041502Abstract: An electromagnetic device arrangement includes a transformer assembly having a core, windings, and a housing disposed around at least a portion of the core and windings. An enclosure at least partially encloses the transformer assembly. The transformer assembly is mounted to a first portion of the enclosure such that heat is transferred from the transformer assembly to the first portion of the enclosure. A second portion of the enclosure has an extension extending therefrom such that the extension is placed in thermal contact with the transformer assembly to transfer heat from the transformer assembly to the extension.Type: GrantFiled: April 5, 2012Date of Patent: May 26, 2015Assignee: Lear CorporationInventors: Ajmal Ansari, Nadir Sharaf, Slobodan Pavlovic
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Patent number: 8910372Abstract: An improved choke assembly for a power electronics device is provided. More specifically, a choke assembly with improved protection from environmental conditions such as dirt and water is provided. An improved choke assembly may include an insulative housing for an inductor coil that seals the inductor coil from the environment.Type: GrantFiled: February 23, 2012Date of Patent: December 16, 2014Assignee: Rockwell Automation Technologies, Inc.Inventors: John R. Brubaker, Lixiang Wei
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Patent number: 8680959Abstract: An immersion cooled inductor includes an inductor at least partially submerged in cooling liquid and a localized boiling feature operable to instigate boiling of the cooling liquid prior to oversaturation.Type: GrantFiled: May 9, 2012Date of Patent: March 25, 2014Assignee: Hamilton Sundstrand CorporationInventor: Robert Scott Downing
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Patent number: 8604899Abstract: An electrical transformer is disclosed which includes an enclosure; a magnetic core assembly arranged within the enclosure, the magnetic core assembly having a first core limb, a second core limb and a third core limb; and three coil assemblies having a first coil assembly, a second coil assembly, and a third coil assembly. At least two diaphragms are arranged within the enclosure, the diaphragms being essentially sealed to a first outermost coil of the first coil assembly, and arranged for guiding a cooling fluid in series through a first inner fluid duct, a second inner fluid duct, a third inner fluid duct and an extra-coil volume along outsides of third, second and first outermost coil coils of the third, second and first coil assemblies.Type: GrantFiled: November 17, 2010Date of Patent: December 10, 2013Assignee: Abb Research Ltd.Inventors: Bernardo Galletti, Arthouros Iordanidis, Jasmin Smajic, Martin Carlen
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Publication number: 20130285784Abstract: An inductor includes an inductor body having a top surface and a first and second opposite end surfaces. There is a void through the inductor body between the first and second opposite end surfaces. A thermally stable resistive element positioned through the void and turned toward the top surface to forms surface mount terminals which can be used for Kelvin type sensing. Where the inductor body is formed of a ferrite, the inductor body includes a slot. The resistive element may be formed of a punched resistive strip and provide for a partial turn or multiple turns. The inductor may be formed of a distributed gap magnetic material formed around the resistive element. A method for manufacturing the inductor includes positioning an inductor body around a thermally stable resistive element such that terminals of the thermally stable resistive element extend from the inductor body.Type: ApplicationFiled: February 15, 2013Publication date: October 31, 2013Inventors: Thomas T. Hansen, Jerome J. Hoffman, Timothy Schafer, Nicholas J. Schade, David Lange, Clark Smith, Rod Brune
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Patent number: 8482370Abstract: An arrangement of a NTC resistor in an electromagnet includes an electromagnetic coil comprising a main winding and a shunt winding, a coil carrier configured to have the electromagnetic coil be wound thereon, a first contact terminal and a second contact terminal configured to supply a voltage, a NTC resistor, a first contact lead comprising a first contact lead end, a second contact lead comprising a second contact lead end, and a third contact lead. The first contact lead, the second contact lead and the third contact lead are configured to interconnect the first contact terminal, the second contact terminal, the main winding, the shunt winding, and the NTC resistor. A fixing element is configured to be elastically deformable and to exert a spring force so as to fix the NTC resistor between the first contact lead end and the second contact lead end.Type: GrantFiled: May 18, 2011Date of Patent: July 9, 2013Assignee: Pierburg GmbHInventor: Janusz Zurke
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Publication number: 20130169398Abstract: An antenna device, capable of stable communications without increasing a space of the entire device by keeping a resonance frequency substantially constant even if the temperature changes, includes: an antenna circuit having an antenna coil with an electrically connected capacitor; the coil receiving a magnetic field transmitted from a reader/writer at a predetermined oscillation frequency; the circuit becoming communicable when inductively coupled to the reader/writer; and a magnetic sheet formed at a position superposed on the coil to change its inductance, wherein the coil has a temperature characteristic in which the inductance is changed with a temperature change, and the sheet has a temperature characteristic of changing the inductance to achieve a characteristic inverse to the inductance change with the temperature change in a predetermined use temperature range, and substantially matching a resonance frequency of the circuit with the oscillation frequency in the use temperature region.Type: ApplicationFiled: November 16, 2011Publication date: July 4, 2013Applicant: DEXERIALS CORPORATIONInventors: Satoru Sugita, Toshiaki Yokota, Yoshimi Takahashi, Katsuhisa Orihara
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Patent number: 8378774Abstract: A coil unit includes a coil including a coil wire, a magnetic substance for receiving magnetic force lines generated by the coil, a first substrate, and a temperature detection element disposed on the first substrate.Type: GrantFiled: May 1, 2009Date of Patent: February 19, 2013Assignee: Seiko Epson CorporationInventors: Hirofumi Okada, Yoichiro Kondo
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Publication number: 20120256719Abstract: In one embodiment, the instant invention can provide an inductor that at least includes the following component(s): at least one FAP positioned along at least one magnetic flux path; where the at least one FAP is a high permeability core gap piece; and where the at least one FAP has an effective magnetic permeability that varies based on at least in part on one of the following factors: i) at least one magnetic flux through the at least one FAP, and ii) sufficient heating of the at least one FAP.Type: ApplicationFiled: January 24, 2012Publication date: October 11, 2012Applicant: MTE CorporationInventors: Todd Shudarek, Wayne Walcott, Wesley Ruther
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Patent number: 8077003Abstract: A coil component includes a first coil winding wound around a first axis, a second coil winding wound around a second axis and juxtaposed to the first coil winding, a connecting member for electrically connecting second terminals that are one end of the first coil winding and one end of the second coil winding, and a heat conductive member mounted on the connecting member and having electrical insulation properties and heat conductivity. The first and second coil windings are each wound such that magnetic flux is generated by a current flowing through the first and second coil windings to pass through an opening of the first coil winding and through an opening of the second coil winding in an opposite direction to the direction passing the opening of the first coil winding. Accordingly, heat generated in the first and second coil windings is dissipated from the heat conductive member.Type: GrantFiled: March 12, 2010Date of Patent: December 13, 2011Assignee: TDK CorporationInventor: Akira Ikezawa
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Patent number: 7911308Abstract: An apparatus for cost-effective and efficient cooling of an active element. The active element may be a magnetic element such as an inductor or a transformer having windings and a core. A thermally conductive vessel has a cavity that is adapted to conform to a surface of the active element, with a small gap remaining between the surface of the active element and the surface of the cavity. The winding is adapted to have a uniform surface, by utilizing an edge winding or a machined winding fabricated from an extruded tube. A thermally conductive encapsulant fills gaps in the apparatus to further improve cooling.Type: GrantFiled: November 26, 2008Date of Patent: March 22, 2011Inventor: Wally E. Rippel
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Patent number: 7760060Abstract: In a vehicle transformer including a core 1, a winding 2, a rectangular tank 3 holding them, a cooling unit 7 for cooling a cooling medium 6 filling the tank 3, and a circulating pump 8 for forcibly circulating the cooling medium 6, a partition member 9 is provided for dividing an interior of the tank 3 into two and the partition member 9 divides a channel of the cooling medium 6 flowing within the winding 2 into a first cooling medium channel 10 and a second cooling medium channel 11, and both of the cooling medium channels 10, 11 are communicated at one end side of the tank 3 and the cooling unit 7 connected to both of the cooling medium channels 10, 11 is provided at the other end for the cooling medium 6 to flow and circulate in the first cooling medium channel 10 and the second cooling medium channel 11. Thereby, the connection between the tank and the cooling unit is simplified and a vehicle transformer reduced in size and weight is obtained.Type: GrantFiled: June 15, 2007Date of Patent: July 20, 2010Assignee: Mitsubishi Electric CorporationInventors: Hiroshi Kiuchi, Yutaka Koba
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Patent number: 7750783Abstract: A coil unit includes a planar coil, a magnetic member that is provided under the planar coil, a magnetic flux leakage prevention member that is provided under the magnetic member, and a heat sink that is provided under the magnetic flux leakage prevention member. The magnetic flux leakage prevention member is electrically insulated from the heat sink. The magnetic flux leakage prevention member is insulated from the heat sink using a double-sided adhesive tape, for example. Since the heat sink dissipates heat generated from the planar coil and is electrically insulated from the magnetic flux leakage prevention member, the heat sink does not function as a member which receives a magnetic flux.Type: GrantFiled: February 19, 2008Date of Patent: July 6, 2010Assignee: Seiko Epson CorporationInventors: Minoru Hasegawa, Masao Kuroda
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Patent number: 7710228Abstract: An electrical inductor assembly comprises an inductor core having a circular shape, a wire guide that surrounds the inductor core and includes a plurality of slots, at least one of the slots forming a path winding around the inductor core, and at least one wire placed in one of the plurality of slots to form a winding. A method of forming an electrical inductor assembly comprises forming an inductor core having a circular shape, surrounding the inductor core with a wire guide, winding at least one wire around the inductor core along a slot in the wire guide, and applying an insulating material to the slot containing the at least one wire to electrically insulate the at least one wire.Type: GrantFiled: November 16, 2007Date of Patent: May 4, 2010Assignee: Hamilton Sundstrand CorporationInventors: Frank Z. Feng, Dwight D. Schmitt, Steven Schwitters, Clifford G. Thiel, Debabrata Pal, John Huss, John Horowy, Joseph Sukkar, Dirk Derr, Mark Hamilton Severson
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Patent number: 7508290Abstract: An inductive component, for the formation of a magnetic circuit has at least one wire winding and at least one core with a ferromagnetic core material. The core comprises a gap and at least one further gap to interrupt the magnetic circuit. The inductive component is characterized in that the gaps each have a gap width of at least 1.0 mm. The core comprises two pieces, for example, which are arranged opposed to each other across the gaps and separated from each other by the gap width. The component is advantageously symmetrical with an essentially equal gap width for the gaps. A miniaturized inductive component is possible by the use of a hire winding made from high frequency braided wire and core material capable of accepting high frequencies, which has a high Q-factor even on a high power throughput and thus low electrical losses. In order to increase the Q-factor, the inductive component also has a cooling device for cooling the wire winding.Type: GrantFiled: July 21, 2003Date of Patent: March 24, 2009Assignee: Siemens AktiengesellschaftInventors: Martin Honsberg-Riedl, Johann Otto, Eckhard Wolfgang
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Patent number: 7183887Abstract: An electronic circuit comprising means (CMNS) for controlling a current (IL) through a coil (L) for the generation of a magnetic field (H). The means (CMNS) comprise means (DMNS) for the determination of a parameter which is a measure for the value of the resistance (RL) of the coil (L). During operation the maximum absolute value of the current (IL) is decreased when the parameter exceeds a certain limit.Type: GrantFiled: June 13, 2003Date of Patent: February 27, 2007Assignee: Koninklijke Philips Electronics N.V.Inventors: Rudolf Johan Maria Vullers, Willem Johannes Antonia Geven, Coen Theodorus Hubertus Fransiscus Liedenbaum
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Publication number: 20040183638Abstract: An ignition coil comprises a housing, a rod-shaped center core 54 arranged substantially at the center within the housing, a thermal stress relaxing member 52 covering the outer circumferential surface of the center core 54, a cylindrical spool 4 arranged on the outer circumferential side of the thermal relaxing member 52 with a gap 9 in between and a resin insulating material 8a with which the gap 9 is filled and which hardens. The thermal stress relaxing member 52 is wound around the center core 54 and the thickness of the thermal stress relaxing member 52 is set to a thickness so that the thermal stress, which is caused by the thermal deformation of the center core 54 and is applied to the resin insulating material 8a, is reduced and reaches a saturation value thereof.Type: ApplicationFiled: January 28, 2004Publication date: September 23, 2004Applicant: DENSO CORPORATIONInventor: Junichi Wada
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Patent number: 6567249Abstract: A invention relates to a transformer having a primary coil and a secondary coil, with a ferromagnetic core inserted in a coil former. The alternating current resistance of the primary coil (3) drops on reaching a triggering temperature (TC) which lies above the operating temperature but below the softening temperature (TW) of the coil former (6) and/or insulation of coil winding (3, 4). The coil core (5) may consist at least partially of a material with a magnetic permeability which drops when the triggering temperature (TC) is exceeded.Type: GrantFiled: May 19, 2000Date of Patent: May 20, 2003Assignee: Werner Truck GmbH & Co. KGInventor: Dietmar Berndt
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Patent number: 6362714Abstract: A multi-part reactive device preferably includes a substrate with a first conductive area and a second conductive area. A first conductive element with a first terminal is connected to the first conductive area. The first conductive element has a second terminal connected to the second conductive area. A current loop is formed extending from the first conductive area, through the first terminal, through the second terminal, to the second conductive area. A magnetically-effective core member is captivated by the first conductive element to the substrate between the first conductive area and the second conductive area and encircles the current loop. The first conductive area, the first conductive element, the magnetically-effective core member, and the second conductive area form a first magnetic circuit. Additional magnetic circuits can be formed by adding additional conductive patterns and additional conductive elements.Type: GrantFiled: June 30, 1999Date of Patent: March 26, 2002Assignee: Motorola, Inc.Inventors: Amy Rice, Mitchell Budniak, Nick Hopman
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Patent number: 6276348Abstract: An ignition coil assembly adapted to be mounted directly in a plug hole of an internal combustion engine. The coil assembly includes a primary coil and a secondary coil. The spool upon which the secondary coil is wound is cylindrical in shape and has ramp structures provided at each end thereof. The ramps decrease voltage concentration between the secondary and primary windings, decrease the voltage gradient along the end wall of the secondary spool, and minimize adverse effects of gaps created during thermal expansion/contraction.Type: GrantFiled: January 12, 2000Date of Patent: August 21, 2001Assignee: Delphi Technologies, Inc.Inventors: Albert Anthony Skinner, Viorel Moga, Antony V. Hirudayaraj, Norman H. Bracken
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Patent number: 6246229Abstract: A method and apparatus for controlling temperature stability of an inductor by using a magnetically coupled metallic object is disclosed in which a metallic object is magnetically coupled to the inductor by a magnetic field emanating therefrom. In one embodiment, the apparatus is tailored for use in a proximity probe of a machine monitoring system and includes the metallic object magnetically coupled to a sensing coil for controlling a resistance versus temperature profile including compensating for a proximity effect resistance of the coil.Type: GrantFiled: May 12, 1999Date of Patent: June 12, 2001Assignee: Bently Nevada CorporationInventor: Rich Slates
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Patent number: 5789918Abstract: A differential transformer includes a primary coil for excitation and first and second secondary coils for detection which can be wound up on an outer surface of a bobbin made of a non-magnetic substance. In the bobbin, i.e., in a differential coil composed of the primary coil and the first and second secondary coils, a core is movably inserted in an axial direction thereof and is made of a magnetic substance. In the differential transformer, when AC current is applied on the primary coil, an induced voltage corresponding to a relative displacement between the core and the differential coil is generated, so that a size of a measured member can be measured by detecting the induced voltage. In the first and second secondary coils, a compound conducting wire is used, which includes two conducting wires which are different from each other in forms of a thermal coefficient of resistivity and are connected by a predetermined rate with regard to their length.Type: GrantFiled: October 16, 1996Date of Patent: August 4, 1998Assignee: Toyoda Koki Kabushiki KaishaInventors: Katsunori Imai, Yuji Takahashi
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Patent number: 5384448Abstract: A thermally stable solenoid including a heater coil and an inductive coil wound around the same axis. The current in the heater coil is controlled by the current in the inductive coil through a control circuit. The heater coil is energized in such a way as to ensure that the heat generated by both coils is constant throughout the required range of operation.Type: GrantFiled: March 18, 1992Date of Patent: January 24, 1995Inventor: James J. Kubasko
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Patent number: 5115193Abstract: A transducer system is provided including an inductive linear displacement transducer connected to a temperature-compensating signal processor. The signal processor includes (a) an amplitude-variable, frequency-stable device providing a modulated D.C. current through the transducer, (b) a temperature-sensitive element connected in series between the transducer and the current-providing device such that it is subjected to substantially the same temperature as the transducer, and (c) a signal processing circuit coupled to the temperature-sensitive element. The temperature-sensitive element has a high temperature coefficient so that temperature changes have a substantial effect on the DC offset of the signal coming from the temperature-sensitive element, and a low dynamic resistance so that temperature changes have substantially no effect on the amplitude of the signal coming from the temperature-sensitive element.Type: GrantFiled: December 5, 1990Date of Patent: May 19, 1992Assignee: Data Instruments, Inc.Inventors: Orville E. Bean, Daniel R. Weber
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Patent number: 5089930Abstract: A differential transformer is provided comprising an elongated bobbin having primary and secondary coils wound about separated sections. A ferromagnetic armature is movably disposed within a core of the bobbin for movement between the separated sections. A tube of electrically conducting material surrounds the bobbin core. The tube is formed of a material whose resistance varies with temperature in the same manner as the primary coil.Type: GrantFiled: April 12, 1991Date of Patent: February 18, 1992Assignee: Pickering Controls, Inc.Inventor: Jacob Chass
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Patent number: 4810990Abstract: A variable inductance transducer includes a winding which is wound about a cylindrical former and a tubular member formed from electrically conductive material which is located about the winding and is movable axially relative thereto. The tubular member is provided with a number of apertures along its length in order to improve the linearity of the transducer.Type: GrantFiled: February 18, 1988Date of Patent: March 7, 1989Assignee: Lucas Industries Public Limited CompanyInventor: Christopher A. Willis
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Patent number: 4794360Abstract: An inductive device comprising a ferromagnetic core which has two approximately U-shaped core halves (9, 11) connected together with their limbs (9', 11'; 9", 11") facing each other so that they enclose a core window (17). Each core half (9, 11) is constructed substantially from a packet of mutually parallel strips of an amorphous ferromagnetic material. Filling members (21', 21") consisting of a solid non-ferromagnetic material are placed between the free ends of each pair of facing limbs (9', 11'; 9", 11"), and in the space (23', 23") between the ends the filling members extend from the core window (17) in the outward direction over at most half of the width of the core limbs. A decrease of the magnetic permeability of the core material as a result of decreasing temperature is compensated by a decrease of the width of the air gaps (23', 23") between the free ends of the limbs (9', 11'; 9", 11").Type: GrantFiled: September 3, 1987Date of Patent: December 27, 1988Assignee: U.S. Philips CorporationInventor: Adrianus J. van Mensvoort
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Patent number: 4704578Abstract: The present invention involves a thermal compensation procedure for magnetic circuits, such as those used in security devices detecting metallic masses, whose losses increase as a function of ambient temperature. According to the invention a body is placed in the immediate proximity of the magnetic circuit, the body being made of a material whose magnetic permeability is a decreasing function of temperature and whose Curie point equals the maximum possible ambient temperature.Type: GrantFiled: April 12, 1985Date of Patent: November 3, 1987Assignee: Jeumont-Schneider CorporationInventor: Jacques Guillaumin
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Patent number: 4467305Abstract: A gas/vapor electromagnetic induction machine comprises an annular coil container including two coaxial electrically insulating cylinders connected at lower ends to an annular bottom plate and coaxially disposed around an iron core within an enclosed tank charged with a non-condensable electrically insulating gas and a condensable cooling gas. A dripping pan receives a condensate of the cooling gas located on the lower portion of the tank through the operation of a pump and drops the condensate into the annular coil container and onto the iron core assembly located within the annular coil container. Thus a coil is always partially or entirely immersed in the condensate collected in the annular coil container.Type: GrantFiled: September 30, 1982Date of Patent: August 21, 1984Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Nobuyoshi Ando
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Patent number: 4267508Abstract: An apparatus for non-contact measurement of the distance or gap between a detection coil and a metallic body arranged in an opposing relation with the detection coil, includes a differential amplifier having one input terminal connected to a reference oscillator and the other input terminal connected to a feedback circuit. The detection coil comprises a cylindrical coil and a plurality of magnetic members in rod form are arranged inside its inner bore along the direction of the coil axis and adjacent to the coil inner wall. The plurality of magnetic members comprise a combination of those having positive temperature characteristic and others having negative temperature characteristic so that a change with temperature of the permeability of the magnetic members as a whole is practically reduced to zero.Type: GrantFiled: April 6, 1979Date of Patent: May 12, 1981Assignee: Nippon Kokan Kabushiki KaishaInventor: Seigo Ando
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Patent number: 4253079Abstract: There is disclosed a displacement transducer which comprises a plurality of planar circuit boards, each having a coaxial central aperture. Each of said boards having disposed thereon at least one spiral conductive structure which manifests a predetermined coil. The structure is oriented about the aperture and has a first and second terminal. The boards are positioned in a stacked array with each of said boards separated one from the other and with said central apertures aligned to form a central coaxial cavity. Leads are coupled to the first and second terminals of said boards for connecting certain ones in a primary winding configuration and others in at least two secondary configurations. A magnetic core adapted for insertion into said cavity varies the coupling between the primary and secondary windings according to the depth of insertion of said core within said cavity.Type: GrantFiled: April 11, 1979Date of Patent: February 24, 1981Inventor: Amnon Brosh
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Patent number: 4205217Abstract: An automatic weld line copying apparatus has a non-contact type sensor including a core wound with an exciting primary winding which in turn is wound with a secondary winding a plurality of secondary coils differentially. The sensor is compact and able to detect, without contact, the distance from the flat surface or edge line of an object to be welded thus making possible accurate and efficient automatic welding of a small welding assembly with a complicated weld line.Type: GrantFiled: December 29, 1976Date of Patent: May 27, 1980Assignees: Hitachi, Ltd., Hitachi Seiko Ltd.Inventors: Takeshi Araya, Tsugio Udagawa
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Patent number: 4159502Abstract: A signal compensator is combined with a second order system, for example, a fluid damped rate gyroscope, which produces a signal in response to the movements of a damped member for providing an output signal which is indicative of the input to the second order system and is unresponsive to variations of the (selected) damping (ratio) of the movable member.Type: GrantFiled: November 14, 1977Date of Patent: June 26, 1979Assignee: Timex CorporationInventor: Arthur Mayer
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Patent number: 4123735Abstract: An induction-type meter for measuring mechanical quantities, comprising a first converter to convert the controlled parameter into a displacement and having elements adapted to be moved relative to each other, and a second converter to convert the displacement into an electric signal and including a magnetic circuit with a block of coils mounted on one of the elements capable of relative movement, and a diamagnetic screen mounted on the other element capable of relative movement. The magnetic circuit is embodied as a closed-open loop system comprised of two parallel parts formed by armored cores mounting said coils and arranged to provide a gap accommodating said diamagnetic screen with profiled working edges.Type: GrantFiled: February 28, 1977Date of Patent: October 31, 1978Inventors: Dmitry M. Mash, Savely S. Schedrovitsky, Zoya I. Golovko, Mikhail P. Zaitsev, Andrei N. Sorokin, Agnia A. Belyaeva, Ivan I. Kharitonov
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Patent number: 3992690Abstract: This electromagnetic coil is composed of concentric multi-turn windings in magnetic aiding relationship, one winding being formed of copper wire and the other of wire made of copper contaminated with a minor percentage of a metal having a different coefficient of resistance than copper. The wires of both windings having a positive temperature coefficient of resistance, one being less than the other so that the power demands of the coil at low temperatures will be reduced with a minimum loss in hot ampere turns. The wire of copper contaminated with the other metal is of a smaller gage size and the thickness of the winding of such wire bears a predetermined ratio to the total of both windings whereby they will have substantially equal heat densities.Type: GrantFiled: January 31, 1975Date of Patent: November 16, 1976Assignee: The Garrett CorporationInventor: Charles J. Sperr, Jr.
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Patent number: 3962919Abstract: A temperature compensated inductive liquid metal level detection system and a preferred probe structure is detailed. The temperature compensation is provided by provision of a separate temperature compensation coil as part of the inductive probe.Type: GrantFiled: July 15, 1975Date of Patent: June 15, 1976Assignee: Westinghouse Electric CorporationInventors: Kerwin C. Playfoot, William H. Todt
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Patent number: 3947794Abstract: A metal strip on a magnetic core body, provided with an air gap, for a coil means, is connected to a surface of the magnetic material such that an assembly similar to a bimetal is formed. Variations in temperature then cause variations of the length of the air gap.Type: GrantFiled: February 10, 1975Date of Patent: March 30, 1976Assignee: U.S. Philips CorporationInventor: Clive Victor Newcomb
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Patent number: 3939403Abstract: A measuring coil comprises two windings, each being formed by winding simultaneously two insulated wires having the same size, the two wires of each winding extending side by side. The windings formed by the single turns of the wires in each winding are interconnected in such a way that the magnetic effects are additive in the wires of a first of said windings and subtractive in the wires of the second winding. The single turns of the first wire in each of the two windings form the measuring coil to be fed by an alternating current and the single turns of the second wire in each of said two windings form both a sensing element for measuring the temperature of the measuring coil and/or a heating element to be fed by an adjustable direct current for maintaining the coil temperature at a predetermined value with a high accuracy.Type: GrantFiled: June 3, 1974Date of Patent: February 17, 1976Inventor: Marie-Claire Stassart