Differential Type (e.g., Lvdt) Patents (Class 324/207.18)
  • Patent number: 10794680
    Abstract: A distance measuring device (100) is provided, comprising a first sensing module (110), a second sensing module (120), a reference device (130), and an evaluating module (140). The first sensing module and the second sensing module are arranged on a horizontal base line (150). Each one of the first and second sensing module is configured to detect the strength of a magnetic field (50) and each one of the first and second sensing module has a first sensing direction (y) and a second sensing direction (x).
    Type: Grant
    Filed: March 17, 2017
    Date of Patent: October 6, 2020
    Assignee: STEMCO PRODUCTS, INC.
    Inventor: Lutz May
  • Patent number: 10782156
    Abstract: Embodiments generally relate to assembly and methods for precisely rigging a linear variable differential transformer (LVDT). For example, the probe rod assembly of a dual tandem LVDT may comprise two moveable cores, a probe fitting, and a probe rod. Generally, the first moveable core may be configured to achieve electrical zero with its respective transformer. Without adjusting the position of the probe rod with respect to the one or more coils of wire, the second moveable core may be configured to achieve electrical zero with its respective transformer. This may ensure that both moveable cores simultaneously achieve electrical zero in the null position. Typically, the probe fitting may be configured to fit at a first end of the probe rod projecting outward from the outer housing. The disclosed assembly and methods may be used to precisely rig dual tandem LVDTs, single channel LVDTs, and dual parallel LVDTs.
    Type: Grant
    Filed: February 19, 2019
    Date of Patent: September 22, 2020
    Assignee: Honeywell International, Inc.
    Inventors: Aaron Daniels, Joe Walling, Charles Licata
  • Patent number: 10690516
    Abstract: The sensor for detecting the position of a generator element which outputs a position-dependent physical variable, the sensor includes a transducer for converting the physical variable into an electric generator signal, a circuit on a wiring support for receiving the generator signal from the transducer and outputting a measurement signal that corresponds to the generator signal and a protective compound which at least partially surrounds the transducer and the wiring support, thus retaining the transducer on the wiring support.
    Type: Grant
    Filed: December 17, 2013
    Date of Patent: June 23, 2020
    Assignee: Continental Teves AG & Co. oHG
    Inventors: Jakob Schillinger, Dietmar Huber, Frank Grunwald, Hilmar Müller, Manfred Goll
  • Patent number: 10634480
    Abstract: A central point positioning determination device and a central point positioning method thereof for a rotor coil of a large-scale steam turbine generator includes a control device, a pulse acquisition device, and a pulse generation device. The pulse generation device is connected to connection ends of a positive terminal and a negative terminal of the rotor of the generator, and a rotor body of the rotor. The control device controls the pulse generation device to send pulses to the positive terminal, the negative terminal, and the rotor body of the rotor of the generator. By doing so, the central point of the rotor coil can be found conveniently and quickly.
    Type: Grant
    Filed: July 26, 2016
    Date of Patent: April 28, 2020
    Assignee: SHANDONG GUTE ELECTRIC CO., LTD
    Inventors: Yuewu Zhang, Juncheng Dong, Yuqing Wei, Kunpeng Tian, Pi'an Zhang
  • Patent number: 10408641
    Abstract: A system for determining the location of a movable element within a container is provided in which a linear variable differential transformer (“LVDT”) is formed with the container and the movable element therein. The LVDT includes a coil assembly including a primary or excitation winding, a secondary or output winding, and a movable element or core that is magnetically permeable. Measurement of an output signals allows for precise determination of the movable element location relative to the container. The system can be utilized to determine fluid volumes in accumulators used for controlling subsea equipment by monitoring the location of a movable element, e.g., a piston, within a hydraulic fluid accumulator.
    Type: Grant
    Filed: October 30, 2014
    Date of Patent: September 10, 2019
    Assignee: Cameron International Corporation
    Inventor: Edward C. Gaude
  • Patent number: 10371515
    Abstract: A system for detecting a position of an object includes a position sensor and a demodulator. The position sensor receives a first excitation signal, senses a displacement of the object with respect to a reference point based on the first excitation signal, and generates first and second sense signals based on the first excitation signal. The demodulator receives the first sense signal and the second sense signal from the position sensor, performs a first cross-correlation calculation between the first sense signal and a second excitation signal and a second cross-correlation calculation between the second sense signal and the second excitation signal, determines displacement of the object with respect to the reference point based on results of the first and second cross-correlation calculations, and determine a position of the object based on the displacement.
    Type: Grant
    Filed: July 18, 2017
    Date of Patent: August 6, 2019
    Assignee: BAE Systems Oontrols Inc.
    Inventors: Patrick Nee, David R. Herdzik
  • Patent number: 10337890
    Abstract: A single housing with a non-ferromagnetic piezo-driven flexure has primary and secondary coil forms of different diameters, one coaxially inside the other, integrated in the flexure. The cylinders defining the planes of the primary and secondaries do not spatially overlap. The secondary coil forms may be wound in opposite directions and wired to provide a transformer device. Movement of the primary relative to the secondaries in the direction of the central axis of the coils can be differentially detected with high precision.
    Type: Grant
    Filed: December 13, 2016
    Date of Patent: July 2, 2019
    Assignee: Oxford Instruments AFM Inc
    Inventors: Roger Carlos Proksch, Dan Bocek, Jason Cleveland, Matthew Longmire, Matthew Klonowski
  • Patent number: 10087740
    Abstract: A tool for evaluating the internal surfaces of tubular is provided, wherein one or more arms extend outwardly from the tool into contact with an inner wall of the tubular, and changes in the dimensions or condition of the inner wall result in changes in the position of the ends of the arms relative to the tool. This motion is converted, through an electromagnetic transducer, into an electrical signal, the amplitude of which falls is maintained as the temperature of the tool changes. In one aspect, the transducer includes a coil and a moveable metal or magnetic element. The coil is powered by a constant current source, and variations in the resistance of the electrical components of the transducer resultingly do not cause fall off of the output signal amplitude.
    Type: Grant
    Filed: April 28, 2016
    Date of Patent: October 2, 2018
    Assignee: PROBE TECHNOLOGY SERVICES, INC.
    Inventors: Marvin Beckman, Thientu Ho
  • Patent number: 10063217
    Abstract: A current-to-voltage conversion circuit according to one aspect of the present invention includes a first resistor, a first current source, a first capacitor, a first output terminal, a first voltage source, a first transistor, and a second resistor. The first resistor includes a first end and a second end. The first end of the first resistor is connectable to an electrode included in a sensor and the second end of the first resistor is connected to a first electrical potential. The first capacitor includes a first end and a second end. The first end of the first capacitor is connected to the first end of the first resistor and the second end of the first capacitor is connected to the first current source. The first transistor includes a first terminal, a second terminal, and a control terminal. The first terminal is connected to the second end of the first capacitor, the second terminal is connected to the first output terminal, and the control terminal is connected to the first voltage source.
    Type: Grant
    Filed: May 20, 2015
    Date of Patent: August 28, 2018
    Assignee: Yokogawa Electric Corporation
    Inventors: Daisuke Hatori, Takashi Yoshida, Tadahiko Takayama, Yusaku Yoshida
  • Patent number: 9983026
    Abstract: A rotational resolver system and method includes a rotational shaft to which at least one eccentric conductive coarse resolution disc is fixed and to which at least one conductive fine resolution disc is also fixed. The fine resolution disc defines a plurality of generally semicircular protruding edge segments. At least one conductive coarse-disc sensing coil is disposed adjacent an edge of the coarse resolution disc, and at least one conductive fine-disc sensing coil is disposed adjacent the edge of the fine resolution disc. These coils may be oriented for axial sensing of the respective disc.
    Type: Grant
    Filed: September 14, 2015
    Date of Patent: May 29, 2018
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Dongtai Liu, George P. Reitsma, Evgeny Fomin
  • Patent number: 9945315
    Abstract: A method for determining a reference current curve for a fuel injector having a magnetic coil drive in an internal combustion engine of a motor vehicle includes: (a) applying a first voltage pulse to the magnetic coil drive to open the fuel injector, (b) applying a holding voltage to the magnetic coil drive to hold the fuel injector open, (c) switching off the holding voltage, (d) waiting for substantially no current to flow through the magnetic coil drive for a predetermined time period that is sufficiently short that the fuel injector remains open, (e) applying a second voltage pulse to the magnetic coil drive, and (f) recording a time-based curve of the current that flows through the magnetic coil drive during the second voltage pulse, which forms the reference current curve. This reference current curve is used for determining a time of a predetermined opening state of the fuel injector.
    Type: Grant
    Filed: April 23, 2014
    Date of Patent: April 17, 2018
    Assignee: CONTINENTAL AUTOMOTIVE GMBH
    Inventor: Frank Denk
  • Patent number: 9921082
    Abstract: A position measurement system including a material measure and a scanning device movable relative to one another with respect to a measurement direction. The material measure has a plurality of markings which are arranged in a row with respect to the measurement direction, wherein the scanning device includes a transmitter winding arrangement. Multiple receiver coils are provided which are arranged in a row with respect to the measurement direction. The inductive coupling between the transmitter winding arrangement and the receiver coils is a function of the position of the scanning device with respect to the material measure. The transmitter winding arrangement defines multiple separate transmitter areas which are arranged in a row with respect to the measurement direction. A maximum of one single receiver coil is situated in each of the transmitter areas. At least one switching means is provided via which the two adjacent receiver coils are differentially interconnectable.
    Type: Grant
    Filed: August 11, 2015
    Date of Patent: March 20, 2018
    Assignee: Robert Bosch GmbH
    Inventors: Guenter Reusing, Johannes Muehlfeld
  • Patent number: 9915553
    Abstract: A scanning head for scanning a material measure on which markings with a period are formed periodically in the measuring direction includes at least two individual sensors configured to produce sensor signals by scanning the markings. The scanning head further includes a digital signal processing apparatus configured to produce at least one highly accurate output signal from the sensor signals. The scanning head is configured to output at least two different types of output signals. The at least two different types of output signals comprises at least one safe output signal and the at least one highly accurate output signal.
    Type: Grant
    Filed: December 12, 2014
    Date of Patent: March 13, 2018
    Assignee: Robert Bosch GmbH
    Inventor: Guenter Reusing
  • Patent number: 9857204
    Abstract: An apparatus for operating a resolver which includes at least one first receiver winding and an exciter winding, which are/can be associated with a rotor, and an evaluation device which determines an angular position of the rotor as a function of an induced voltage that is generated by the exciter winding and detected by the receiver winding. According to the invention, the first receiver winding is connected at a first end to an actuable switch by means of a first RC circuit, said switch connecting the RC circuit as required to a positive voltage source, and the first receiver winding is connected at a second end to a second actuable switch by means of a second RC circuit, said second switch connecting the second RC circuit as required to a negative voltage source, and to a control unit which simultaneously actuates the switches as required.
    Type: Grant
    Filed: June 11, 2015
    Date of Patent: January 2, 2018
    Assignee: Robert Bosch GmbH
    Inventors: Manfred Kirschner, Edwin Eberlein
  • Patent number: 9835474
    Abstract: A sensor for detecting a position of an encoder magnet in a direction of motion, including: a first coil extending in the direction of motion, a second and third coil, which are aligned with the first coil and which are arranged symmetrical to each other with respect to a point of symmetry as observed in the direction of motion and which accordingly form a first and second transformer with the first coil, the transformation ratio of which transformers depends on the position of the encoder magnet, and a magnetic asymmetry, which changes the transformation ratio of one of the transformers with respect to the other transformer.
    Type: Grant
    Filed: January 31, 2014
    Date of Patent: December 5, 2017
    Assignee: Continental Teves AG & Co. oHG
    Inventor: Heinrich Acker
  • Patent number: 9810552
    Abstract: A method for determining a position of a magnet assembly relative to an array of inductive elements arranged adjacent to a magnetically permeable material, the method involving: measuring electrical characteristics of each of one or more inductive elements of the array of inductive elements; and from information derived from the measured electrical characteristics of the one or more inductive elements of the array of inductive elements, determining the position of the magnet assembly relative to the array of inductive elements.
    Type: Grant
    Filed: April 16, 2015
    Date of Patent: November 7, 2017
    Assignee: Nucleus Scientific Inc.
    Inventors: Ian W. Hunter, George C. Whitfield, Peter G. Madden
  • Patent number: 9726520
    Abstract: A sensor for detecting a position of a transducer magnet in a movement direction, including: —a coil carrier extending in the movement direction, —a first coil extending in the movement direction that is wound onto the coil carrier and—a second and a third coil oriented according to the first coil, which are wound onto the coil carrier such that the second and third coils accordingly form a first and second transformer with the first coil, the transformation ratio of which is dependent on the position of the transducer magnet, —wherein at least the second coil or the third coil is arranged between the coil carrier and the first coil.
    Type: Grant
    Filed: February 24, 2014
    Date of Patent: August 8, 2017
    Assignee: Continental Teves AG & Co. oHG
    Inventor: Heinrich Acker
  • Patent number: 9581425
    Abstract: Sensor having a primary coil, two secondary coils as well as an evaluator. An excitation signal may be applied to the primary coil. An output signal depending on a position of a coupling element may be induced in each secondary coil. An evaluator is configured to evaluate the output signals in order to evaluate a phase offset between the output signals. Further, the evaluator is configured to provide a sensor output signal indicating the position or change in position of the coupling element.
    Type: Grant
    Filed: August 1, 2014
    Date of Patent: February 28, 2017
    Assignee: Hahn-Schickard-Gesellschaft für angewandte Forschung e.V.
    Inventors: André Buelau, Karl-Peter Fritz, Frank Wolter
  • Patent number: 9518814
    Abstract: A single housing with a non-ferromagnetic piezo-driven flexure has primary and secondary coil forms of different diameters, one coaxially inside the other, integrated in the flexure. The cylinders defining the planes of the primary and secondaries do not spatially overlap. The secondary coil forms may be wound in opposite directions and wired to provide a transformer device. Movement of the primary relative to the secondaries in the direction of the central axis of the coils can be differentially detected with high precision.
    Type: Grant
    Filed: August 6, 2013
    Date of Patent: December 13, 2016
    Assignee: Oxford Instruments Asylum Research Inc
    Inventors: Roger Proksch, Dan Bocek, Jason Cleveland, Matthew Longmire, Matthew Klonowski
  • Patent number: 9395511
    Abstract: A device for focusing a laser in which a voice coil and LVDT are mounted in parallel alignment with each other and have a common centrally disposed armature. A central bore extends through the armature. A lens is mounted at one end of the armature and a laser is located at the opposite end. The laser beam passes through the central bore and is focused by the voice coil moving the armature which in turn moves the lens. The LVDT accurately positions the armature to focus the laser beam.
    Type: Grant
    Filed: January 26, 2015
    Date of Patent: July 19, 2016
    Assignee: Magnet-Schultz of America, Inc.
    Inventor: Kevin Code
  • Patent number: 9356486
    Abstract: An apparatus includes a housing which defines a longitudinal axis; a positioning element which, relative to the housing, translates linearly along the longitudinal axis; and a rotational member which, relative to the housing, rotates about the longitudinal axis as the positioning element translates linearly along the longitudinal axis. The rotational member defines a helix to receive torque from the positioning element as the positioning element translates linearly along the longitudinal axis. The apparatus further includes a first sensor assembly to detect minor angular displacement of the rotational member (e.g., less than 360 degrees). The apparatus further includes a second sensor assembly to detect major angular displacement of the rotational member (e.g., a number of full 360 degree rotations). Such detection is capable of identifying a full angular displacement of the rotational member in response to linear translation of the positioning element from an initial position to a sensed position.
    Type: Grant
    Filed: August 30, 2013
    Date of Patent: May 31, 2016
    Assignee: Woodward HRT, Inc.
    Inventor: Joseph Thomas Kopecek
  • Patent number: 9347331
    Abstract: Electrodynamic control of fluid leakage loss is provided. Embodiments utilize electrohydrodynamic (EHD) principles to control and/or reduce leakage flow in turbomachinery. Electrodes can be used to provide a flow actuation mechanism inside the clearance gap for generating discharge. The electrodes can be positioned to have geometric asymmetry. Embodiments provide the electrodes on a turbine blade. The blade can have a DC power that can function as a square pulsed DC wave with the duty cycle equal to the blade passing frequency and the stator can be grounded. In an embodiment, the stator can have the actuator of the electrode-insulator assembly attached to the inside. In one embodiment, the actuators can be arranged just on the stator or casing. The phase and power supply to individual electrodes can be adapted as needed. In one embodiment, the phase can be lagged for accurate control of leakage flow.
    Type: Grant
    Filed: June 11, 2008
    Date of Patent: May 24, 2016
    Assignee: University of Florida Research Foundation, Inc.
    Inventor: Subrata Roy
  • Patent number: 9315106
    Abstract: Circuit for evaluating resolver sensor signals (28) in a vehicle, having a resolver sensor (4), set up to pick up a rotary movement of a rotor (6) in an electrical machine (16), and a processor element (12), wherein the resolver sensor (4) is set up to output at least one sinusoidal or cosinusoidal amplitude-modulated analog signal that is characteristic of the rotary movement of the rotor (6), characterized in that the processor element (12) has a data processing unit (12a), a resolver sensor actuation unit (12b) and a resolver sensor evaluation unit (12c), wherein the analog signal from the resolver sensor (4) is connected directly to the resolver sensor evaluation unit (12c).
    Type: Grant
    Filed: May 15, 2012
    Date of Patent: April 19, 2016
    Assignee: Robert Bosch GmbH
    Inventors: Chengxuan Fu, Wilfried Feuchter, Rene Bischof
  • Patent number: 9243933
    Abstract: Displacement sensor arrangement including at least one primary coil, at least a first and a second secondary coil and at least one magnetically soft coupling element, which magnetically couples the primary coil and the two secondary coils, the displacement sensor being designed so that a position and/or deflection depending on the magnetic coupling between the primary coil and at least the first and second secondary coil is detected, the displacement sensor arrangement having a signal processing unit, which is designed to perform digital signal processing of at least one electrical variable of the two secondary coils and determine the position and/or deflection, the signal processing unit having at least one Goertzel filter.
    Type: Grant
    Filed: September 7, 2012
    Date of Patent: January 26, 2016
    Assignee: Continental Teves AG & Co. oHG
    Inventors: Sören Lehmann, Frank Grunwald
  • Patent number: 9182514
    Abstract: The invention relates to a shielded double-coil multilayer assembly intended to be used in an inductive detector. This multilayer assembly comprises a plurality of stacked parallel separated layers, namely: a layer (C1) comprising a first shielding element for a first coil, a layer (C2) comprising all or part of a first coil, a layer (C3) comprising all or part of a second coil, a layer (C4) comprising a first shielding element for the second coil.
    Type: Grant
    Filed: August 14, 2012
    Date of Patent: November 10, 2015
    Assignee: Schneider Electric Industries SAS
    Inventors: Jacques Bernard, Pierre-Marie Charrier
  • Patent number: 9140579
    Abstract: A low power inductive proximity sensing system in which a DC voltage to the inductors is only applied for a short time period needed to detect the presence or absence of an appropriate object. After the detection time period is over, DC voltage is no longer applied to the inductors.
    Type: Grant
    Filed: September 24, 2013
    Date of Patent: September 22, 2015
    Inventor: Fred Mirow
  • Patent number: 9097558
    Abstract: A position sensor includes a detector, an oscillation circuit, a signal processing circuit, and a resonance circuit having a detection coil and a capacitor. The oscillation circuit forms a negative feedback loop from: an amplitude detection circuit that detects an amplitude of an oscillation signal outputted from the resonance circuit; an integrating circuit that outputs a signal corresponding to a difference between a predetermined reference voltage and the amplitude of the oscillation signal; a negative conductance control circuit that, based on the output of the integrating circuit, controls the negative conductance of the oscillation circuit such that the amplitude of the oscillation signal is equals to the predetermined reference voltage; and an operational amplifier that adjusts such that the oscillation voltage of the resonance circuit is equal to the applied voltage of the negative conductance control circuit.
    Type: Grant
    Filed: February 23, 2011
    Date of Patent: August 4, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Masahisa Niwa, Kunitaka Okada
  • Patent number: 9094015
    Abstract: One embodiment of the present invention relates to a method and apparatus to perform a low power activation of a system by measuring the slope of a digital signal corresponding to a motion sensor measurement value. In one embodiment, a low power activation circuit is coupled to magnetic motion sensor configured to output a magnetic signal proportional to a measured magnetic field. The low power activation circuit may comprise a digital tracking circuit configured to provide a digital signal that tracks the magnetic field and a difference detector configured to detect a difference between a current digital signal and a prior digital signal stored in a digital storage means. If the detected difference is larger than a digital reference level, an activation signal is output to awaken a system from a sleep mode.
    Type: Grant
    Filed: January 14, 2011
    Date of Patent: July 28, 2015
    Assignee: Infineon Technologies AG
    Inventor: Mario Motz
  • Publication number: 20150145507
    Abstract: A transformer position sensor includes a primary coil, a secondary coil, and an electrically shorted coil. The primary coil is adapted to receive an excitation signal and is configured, upon receipt of the excitation signal, to generate a primary magnetic flux. The secondary coil is inductively coupled to the primary coil upon electrical excitation of the primary coil, and includes a plurality of differentially wound coils. The electrically shorted coil is inductively coupled to receive at least a portion of the primary magnetic flux generated by the primary coil. The electrically shorted coil is configured, upon receipt of at least a portion of the primary magnetic flux, to generate a magnetic flux that opposes the primary magnetic flux.
    Type: Application
    Filed: November 26, 2013
    Publication date: May 28, 2015
    Inventors: Vikrant Deshmukh, John Jerred
  • Publication number: 20150115938
    Abstract: A magnetic field detection device includes: a first magnetic field generating part, including a first magnetic field generating conductor; a first magnetic field detection part, including a first magnetic field detection element and a first differential operation part, wherein a first output of the first magnetic field detection element corresponding to the environment magnetic field is inputted into the first differential operation part, and a first feedback current flows into the first magnetic field generating conductor, and thus the first magnetic field generating part provides the first magnetic field detection element with a first feedback current magnetic field, with a direction opposite to the environment magnetic field; a second magnetic field generating part, including a second magnetic field generating conductor, in which a second current corresponding to the first feedback current flows; and a second magnetic field detection part, including a second magnetic field detection element.
    Type: Application
    Filed: October 30, 2014
    Publication date: April 30, 2015
    Inventors: Tamon KASAJIMA, Kei TANABE, Akihiro OGAWA
  • Publication number: 20150108969
    Abstract: A linear variable differential transformer (“LVDT”) including a semiconductor substrate and a plurality of coils formed at least partially on the substrate.
    Type: Application
    Filed: October 7, 2014
    Publication date: April 23, 2015
    Inventor: William Robert Krenik
  • Patent number: 8994367
    Abstract: A differential transformer type magnetic sensor is disclosed. The drive coil includes a planar coil arranged on a substrate. The first differential coil includes a planar coil arranged on the substrate. The second differential coil includes a planar coil arranged on the substrate and connected to the first differential coil. The first selector unit is used for a zero adjustment of a differential transformer. The first differential coil includes a plurality of first branch lines formed by branching a wire material forming the outermost turn of the first differential coil. The plurality of first branch lines are so arranged that the amount of magnetic fluxes passing along the plurality of respective first branch lines differ when the drive coil is driven. The first selector unit is capable of selecting any one of the plurality of first branch lines and arranged on the substrate.
    Type: Grant
    Filed: October 16, 2012
    Date of Patent: March 31, 2015
    Assignee: Kyocera Document Solutions
    Inventor: Yukihiro Aikawa
  • Publication number: 20150042321
    Abstract: Disclosed are assemblies, systems, devices and methods, including an assembly to determine an angular position of a rotatable structure external to the assembly. The assembly includes a sensor including a rotatable member, a main winding set and at least one auxiliary winding, and also a coupling element to couple the sensor to the external rotatable structure to cause rotation of the rotatable member of the sensor in response to rotation of the external rotatable structure. Resultant voltages at the main winding set and at the at least one auxiliary winding are produced based, at least in part, on an angular position of the rotatable member of the sensor. The angular position of the external rotatable structure is determined based on the resultant voltages at the main winding set and at the at least one auxiliary winding.
    Type: Application
    Filed: January 27, 2012
    Publication date: February 12, 2015
    Inventors: Saeed Yazdani, Hashmat Aziz
  • Publication number: 20150035519
    Abstract: Sensor having a primary coil, two secondary coils as well as an evaluator. An excitation signal may be applied to the primary coil. An output signal depending on a position of a coupling element may be induced in each secondary coil. An evaluator is configured to evaluate the output signals in order to evaluate a phase offset between the output signals. Further, the evaluator is configured to provide a sensor output signal indicating the position or change in position of the coupling element.
    Type: Application
    Filed: August 1, 2014
    Publication date: February 5, 2015
    Inventors: André BUELAU, Karl-Peter FRITZ, Frank WOLTER
  • Patent number: 8947075
    Abstract: A variable reluctance angle sensor includes a stator, a rotor, and a computation section. The stator includes a core member having teeth, which are arranged in a circumferential direction, and excitation coils, which are respectively wound about the teeth such that magnetic poles of the teeth have different polarities alternately in the circumferential direction. An input voltage is supplied to the excitation coils. The rotor radially faces the teeth of the stator. The rotor has a shape such that gap permeance with respect to the stator changes in a sinusoidal fashion in accordance with the rotational angle of the rotor. The computation section obtains output voltages of two or more phases having different phases based on the voltages of the excitation coils, and detects the rotational angle of the rotor based on the output voltages.
    Type: Grant
    Filed: June 29, 2012
    Date of Patent: February 3, 2015
    Assignee: Asmo Co., Ltd.
    Inventors: Noboru Tsuge, Nobuo Shiba
  • Publication number: 20150028862
    Abstract: A stator structure and a VR type resolver, in which the winding of the resolver can be prevented from corroding without increasing the production cost, are provided. The stator structure has stator protruding portions and coils wound around the stator protruding portions, the coils consisting of exciting coils, sine phase detection coils, and cosine phase detection coils, and at least the coils wound at the outermost side are formed by wires in which conductive portions are made of aluminum.
    Type: Application
    Filed: July 2, 2014
    Publication date: January 29, 2015
    Inventor: Haruki OTOBE
  • Patent number: 8928310
    Abstract: The present invention relates to a reluctance resolver (100) with an at least partially soft magnetic stator (104) and an at least partially soft magnetic rotor (102) which oppose each other by forming an air gap. The magnetic resistance in the air gap changes periodically on account of a configuration of the rotor that varies over the circumference. The angle sensor has a magnetic flux transmitter which is arranged on the stator and generates a predefined magnetic flux distribution in the air gap via at least one pair of poles. Furthermore, a magnetic flux receiver, which measures the intensity of the magnetic field via at least two pairs of signal poles arranged offset from one another at an angle, is arranged on the stator, wherein an angle value for a position of the rotor in relation to the stator can be derived from the two receiver signals.
    Type: Grant
    Filed: April 23, 2010
    Date of Patent: January 6, 2015
    Assignee: Tyco Electronics Belgium EC BVBA
    Inventors: Tom Ocket, Jan Van Cauwenberge, Jurgen Verstraete
  • Patent number: 8872508
    Abstract: A half-bridge variable differential transformer position sensing system that includes a transducer having a stator with an inductive coil having a center tap configured to provide an output signal. The transducer also has an armature with a magnetically permeable core configured to move within the inductive coil, such that movement of the magnetically permeable core causes a change in the output signal. The position sensing system includes a first circuit configured to provide an excitation signal at one terminal of the inductive coil. The system includes no more than three electrical interface wires, and a microcontroller configured to calculate the degree of change in the position of the magnetically permeable core, and is configured to correct for variations in the voltage of the output signal due to the temperature of the transducer and due to non-linear effects on the output signal caused by movement of the magnetically permeable core.
    Type: Grant
    Filed: January 6, 2012
    Date of Patent: October 28, 2014
    Assignee: Woodward MPC, Inc.
    Inventors: Zenon P. Szulyk, Ganga P. Jayaraman, Brian M. Hahn
  • Publication number: 20140306694
    Abstract: A method for determining direction of travel of a tag is described. The method includes a tag that receives sample signals from two spatially separate LF magnetic fields generated by an exciter. The received signal strength indicator (RSSI) data associated with each of the sample signals is determined. A first RSSI profile is created for the first LF magnetic fields. A second RSSI profile is created for the second LF magnetic fields. The first and second RSSI profiles are compared to determine a direction of travel of the object. A tag, an exciter and a computer readable medium are configured to facilitate the method.
    Type: Application
    Filed: April 16, 2014
    Publication date: October 16, 2014
    Applicant: Lyngsoe Systems Limited
    Inventors: Alex Oprea, Xiaohui Yu, Xiaojuan He
  • Patent number: 8847583
    Abstract: An electromagnetic induction type absolute position measuring encoder having two or more rows of scale coils, each of the rows having a scale pitch different from that of another row; a transmitter coil and a receiver coil arranged on a grid that is movable relative to the scale in the measuring direction so as to face the scale coils; and the track is constituted by the scale coils, the transmitter coil and the receiver coil. The encoder is capable of measuring an absolute position of the grid with respect to the scale from a flux change detected at the receiver coil via the scale coils when the transmitter coil is excited, in which at least one loop-shaped additional scale coil is added between the scale coils in at least one of the tracks.
    Type: Grant
    Filed: August 1, 2012
    Date of Patent: September 30, 2014
    Assignee: Mitutoyo Corporation
    Inventors: Kouji Sasaki, Osamu Kawatoko
  • Publication number: 20140247041
    Abstract: The invention relates, in particular, to an instrument for measuring length, comprising an inductive sensor comprising an elongate body and a tip that is movable along a longitudinal axis. The body contains windings and defines a first cavity receiving a magnetic core. The instrument further comprises a casing which extends the body along the longitudinal axis, and which defines, together with the body, a second sealed cavity containing the tip. The capacity of the casing to resiliently deform along the longitudinal axis is greater than the capacity of said casing to resiliently deform along axes that are orthogonal to said longitudinal axis.
    Type: Application
    Filed: August 1, 2012
    Publication date: September 4, 2014
    Applicant: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
    Inventor: Frédéric Rodiac
  • Patent number: 8775117
    Abstract: An encoder includes a detector, a first position data calculator, a first data converter, an approximation device and a third position data calculator. The first data converter is configured to convert a first position data calculated by the first position data calculator into second position data whose second width in bits is longer than a first width in bits of the first position data. The approximation device is configured to calculate an approximation function that derives position data when timing data is input, based on a plurality of the second position data converted by the first data converter at a plurality of successive sampling timings, respectively. The third position data calculator is configured to calculate third position data indicating a position of a detection target at an output timing, based on the approximation function calculated by the approximation device.
    Type: Grant
    Filed: September 22, 2011
    Date of Patent: July 8, 2014
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Hironobu Yoshitake, Jirou Muraoka
  • Patent number: 8754639
    Abstract: A method of testing a transformer prior to installation in a high-pressure environment wherein the transformer comprises a transformer core comprising a stack of a plurality laminations, is provided. The method comprises applying a mechanical compression force to the stack, the force being at least equivalent to the ambient pressure of the high-pressure environment; and testing the electrical efficiency of the transformer.
    Type: Grant
    Filed: June 21, 2011
    Date of Patent: June 17, 2014
    Assignee: Vetco Gray Controls Limited
    Inventors: Silviu Puchianu, Steven Lewis Simpson, Graham Thomas Morley
  • Publication number: 20140159709
    Abstract: A measurement device is provided. The measurement device comprises a ring-shaped base and multiple sensing units and a plurality of coils. The sensing units are disposed on and protruded from the inner circumferential surface of the ring-shaped base. Each sensing unit comprises a circumferential groove and an axial groove. The axial groove is connected to the circumferential groove. Each coil is surrounded within the circumferential groove and extended along the axial groove.
    Type: Application
    Filed: December 6, 2013
    Publication date: June 12, 2014
    Applicant: Industrial Technology Research Institute
    Inventors: Chung-Hsien LIN, Deng-Mao WANG, Chong-Xian SU, Shou-Long YU, Chao-Yun CHEN
  • Patent number: 8712710
    Abstract: A method includes measuring a first voltage (VA) across a first sensing coil of a linear variable differential transformer (LVDT) and measuring a second voltage (VB) across a second sensing coil of the LVDT. The method also includes signaling a core fallout condition in response to (i) determining that a ratio of VA and VB is within a specified range of a value of one and (ii) determining that a sum of VA and VB is less than a sum of VA0 and VB0 by more than a specified amount. VA0 and VB0 are minimum voltages across the first and second sensing coils of the LVDT, respectively, when a core of the LVDT is in the LVDT.
    Type: Grant
    Filed: May 13, 2011
    Date of Patent: April 29, 2014
    Assignee: Honeywell International Inc.
    Inventors: Rakesh Damodaran Nair, Arulvel Sellamuthu, Nagaraja Sundaresh, Manjunatha Kotreshi Alabur, Amol Kinage, Karthik Giritharan, Ananda Huchappa Shastry
  • Publication number: 20130314078
    Abstract: A single housing with a non-ferromagnetic piezo-driven flexure has primary and secondary coil forms of different diameters, one coaxially inside the other, integrated in the flexure. The cylinders defining the planes of the primary and secondaries do not spatially overlap. The secondary coil forms may be wound in opposite directions and wired to provide a transformer device. Movement of the primary relative to the secondaries in the direction of the central axis of the coils can be differentially detected with high precision.
    Type: Application
    Filed: August 6, 2013
    Publication date: November 28, 2013
    Applicants: OXFORD INSTRUMENTS AFM INC, OXFORD INSTRUMENTS PLC
    Inventors: Roger Proksch, Dan Bocek, Jason Cleveland, Matthew Longmire, Matthew Klonowski
  • Publication number: 20130271121
    Abstract: A resolver according to the invention includes a stator provided with a plurality of teeth, and first to third phase output coils wound around the teeth. When voltages induced in the first to third phase output coils change based on rotation of a rotor, voltage signals corresponding to an electrical angle of the rotor are output from the output coils. One of the first to third phase output coils is wound around each of the teeth. With respect to each of the phases, the distribution of the numbers of turns of each phase output coils, among the first to third phase output coils, is set to a sinusoidal distribution with respect to the electrical angle of the rotor.
    Type: Application
    Filed: April 3, 2013
    Publication date: October 17, 2013
    Applicant: JTEKT CORPORATION
    Inventor: Noritake URA
  • Patent number: 8555918
    Abstract: Flow rate control valve includes: a target probe formed of a magnetically-responsive substance and mounted to one end of a spool; a sensor housing mounted to the one end of the sleeve and having a cylinder section defining an inner space to permit entry therein of the target probe; and first and second coils provided around the cylinder section and axially spaced from each other by a predetermined distance. The probe is constructed so that magnetic response of the coils gradually varies in one direction in response to a linear position of the target probe. The first coil responds to the target probe, while the second coil does not respond to the target probe. Impedance of the first coil varies with a linear position of the probe (31), and the linear position of the probe is detected through differential synthesis performed between outputs of the first and second coils.
    Type: Grant
    Filed: July 31, 2008
    Date of Patent: October 15, 2013
    Assignee: Amiteq Co., Ltd.
    Inventor: Atsushi Goto
  • Patent number: 8542008
    Abstract: A displacement sensor includes a primary coil (2), secondary coils (4a, 4b), and a movable magnetic core (6) movable with displacement of an object to be measured to cause voltages generated in the secondary coils (4a, 4b) to vary. The secondary coils (4a, 4b) are differentially interconnected. A polyphase signal generating unit (10) generates two-phase component signals having different phases, from a differentially combined output voltage of the secondary coils (4a, 4b). Full-wave rectifying units (16, 18) rectify the polyphase component signals, the rectified polyphase component signals are combined in a combiner (22), and the combiner output is applied to a low-pass filter (24).
    Type: Grant
    Filed: October 2, 2007
    Date of Patent: September 24, 2013
    Assignees: Shinko Electric Co., Ltd., Nabtesco Corporation
    Inventors: Yasushi Nakano, Hiroshi Akase, Daiju Kaneshiro
  • Patent number: 8531182
    Abstract: A control system for use in safety critical human/machine control interfaces is described, more particularly a joystick type control system and particularly a joystick type control system utilizing magnetic positional sensing. The control system provides a control input device having a movable magnet, a pole-piece frame arrangement positioned about the magnet, at least three magnetic flux sensors being positioned in said pole-piece frame arrangement and a monitoring arrangement for monitoring the output signal of each of said at least three sensors.
    Type: Grant
    Filed: June 19, 2008
    Date of Patent: September 10, 2013
    Assignee: Penny & Giles Controls Limited
    Inventor: Dev Kumar Banerjee