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| Number | Title | Issue Date |
| 6925893 | Rotation sensor A rotation sensor includes a first rotor constituted by a magnetic material and having an outer face that has first conductive layers disposed in two levels as viewed in the direction of a rotation axis and second conductive layers disposed outwardly of and between ... | 08/09/2005 |
| 6925975 | Controller for controlling an electromagnetic actuator A controller for an electromagnetic actuator comprises a pair of springs acting on opposite directions, and an armature connected to the springs. The armature is held in a neutral position given by the springs when the armature is not activated. The actuator also co... | 08/09/2005 |
| 6922065 | Coil impendance detection method and object detection method and apparatus using the same A triangular wave generating circuit (21) generates a sweep voltage of a triangular wave, a VCO (22) generates a sweep of a frequency according to the sweep voltage, and a driving coil (4) is driven by the sweep voltage. From the current flowing... | 07/26/2005 |
| 6917896 | Method and apparatus for using eddy current transducers in magnetic fields A method for measuring the distance of a gap separating an eddy current transducer and a target is provided. The method includes determining a normalized impedance curve for the transducer, determining a time rate of change of the normalized impedance of the transdu... | 07/12/2005 |
| 6917203 | Current signature sensor A solenoid health monitoring system uses a signal conditioner and controller assembly in one embodiment that includes analog circuitry and a DSP controller. The analog circuitry provides signal conditioning to the low-level raw signal coming from a signal acquisitio... | 07/12/2005 |
| 6909279 | Position sensor to compensate for change of temperature coefficient of impedance of a detection coil A direct current and an alternate current are simultaneously supplied from a constant current circuit to a detection coil. At least one of the ratio of the direct current to the alternate current, the ratio of an alternate current component to a direct current compo... | 06/21/2005 |
| 6891365 | Rotation angle detection device A highly accurate rotation angle detection device is realized by correcting a detecting position error caused by a machining error such as deterioration of roundness of an internal diameter of a stator. The rotation angle detection device is provided with a stator (... | 05/10/2005 |
| 6873149 | Method and system for eddy current proximity system noise reduction A method of determining a gap between an eddy current proximity transducer and a target is provided. The method includes providing a data structure that is populated with data that is relative to a gap value corresponding to a complex impedance value of the transduc... | 03/29/2005 |
| 6838887 | Proximity detection circuit and method of detecting small capacitance changes Apparatus for dispensing paper from rolls which feeds continuously, roll to roll, and does not require extra procedure to bring stub roll into position. The apparatus holds and positions at least first and second rolls of paper with respect to each other; dispenses ... | 01/04/2005 |
| 6838873 | Position sensor A Position Sensor comprises: one or more excitation windings; a signal generator adapted to apply excitation signals to the or each excitation winding; tag means displaceable relative to said excitation windings; one or more sensor windings electromagnetically coupl... | 01/04/2005 |
| 6828780 | Position measuring system having an inductive element arranged on a flexible support In order to improve a position measuring system comprising a transmitter and a sensor which comprises at least one inductive element, to which the transmitter is coupled electromagnetically, wherein sensor and transmitter can be positioned relative to one another an... | 12/07/2004 |
| 6812693 | Inductive displacement sensor with volume occupying winding An improved inductive displacement sensor for use in a hydraulic accumulator for sampling the degree of filling of the hydraulic accumulator. The displacement sensor is provided with an electrical winding on a coil former. To reduce the gas volume of the hydraulic a... | 11/02/2004 |
| 6803859 | Method and apparatus for active isolation in inductive loop detectors An oscillator circuit for use with a wire-loop inductive sensor and method for use. The oscillator circuit highly attenuates common-mode noise detected by the wire-loop and differential noise from both ambient and crosstalk sources are filtered by active isolation. | 10/12/2004 |
| 6803758 | Non-contact magnetically variable differential transformer A magnetically variable differential transformer, comprising: a primary winding; a first secondary winding; a second secondary winding; a non-movable permeable core disposed within the primary winding, the first secondary winding and the second secondary winding; an... | 10/12/2004 |
| 6801113 | Proximity sensor with improved positioning accuracy for detection coil peripheral members A proximity sensor according to the present invention includes protrusions that are provided on a wire-winding drum of a coil spool around which a lead wire of a detection coil is wound, that protrude toward the center from not less than three points distributed in ... | 10/05/2004 |
| 6798635 | Method and arrangement for determining the position of an electromagnetic actuator The invention relates to a method for driving and measuring the position of an electromagnetic actuator that operates according to the voice coil principle. The coil thus moves within a magnetized gap relative to permanent magnet core. As the coil extends partially ... | 09/28/2004 |
| 6798609 | Magnetic microactuator with capacitive position sensor A disc drive system includes a recording disc rotatable about an axis, a slider supporting a transducing head for transducing data with the disc, and a dual-stage actuation assembly supporting the slider to position the transducing head adjacent a selected radial tr... | 09/28/2004 |
| 6771064 | Inductive sensor apparatus and method for deploying An apparatus for sensing variations in an inductive field, or inductive sensor. The inductive sensor is adapted for detecting the lateral offset of a vehicle within a roadway, especially those with multiple traffic lanes, without regard to lane boundaries, which may... | 08/03/2004 |
| 6756794 | Apparatus for determining a gap between a proximity probe component and a conductive target material A digital eddy current proximity system including a digital impedance measuring device for digitally measuring the proximity probes impedance correlative to displacement motion and position of a metallic target object being monitored. The system further including a ... | 06/29/2004 |
| 6747448 | Rotary position sensor methods and systems An apparatus and method are disclosed herein for sensing rotary position. A rotor and stator are positioned proximate to one another but are not in contact with one another. The rotor comprises at least one radial spoke for receiving angular information from the sta... | 06/08/2004 |
| 6737861 | Method for determining the position of the rotor of an electric machine, and a position sensor A method for determining the position of the rotor (5) of an electric machine in the radial direction (X, Y) and in the axial direction (Z) applies a cogged ring (2), through which the shaft (5a) of the rotor (5) is placed. The sha... | 05/18/2004 |
| 6734666 | Method of determining the angular position of a permanent magnet rotor of a polyphase electric motor This method consists in supplying at least a first alternating signal, at a determined frequency, to one end of a stator coil and recuperating a measurement signal at a second end of said coil, said measurement signal being provided to electronic processing means, w... | 05/11/2004 |
| 6734665 | Inductive sensor having a sensor coil in the form of a structured conductive layer In order to so improve an inductive sensor comprising at least one sensor coil in the form of a structured, conductive layer of a carrier board, and an evaluation circuit comprising a printed circuit board with conductor tracks provided thereon and being connected t... | 05/11/2004 |
| 6731107 | Star-connected sensor In a rotary assembly comprising a rotor mounted in rotation in a stator about a mean axis of rotation, a radial position sensor comprises three induction sensors distributed in the stator substantially at 120° from one another around the rotor and equidistant from ... | 05/04/2004 |
| 6727688 | Method for measuring a gap between a proximity probe and a conductive target material A digital eddy current proximity system including a digital impedance measuring device for digitally measuring the proximity probes impedance correlative to displacement motion and position of a metallic target object being monitored. The system further including a ... | 04/27/2004 |
| 6714004 | Inductive position measuring system In order to provide a position measuring system, comprising a transmitter, a sensor with an inductive element to which the transmitter is coupled electromagnetically and an evaluating unit, wherein the sensor and the transmitter are adapted to be positioned relative... | 03/30/2004 |
| 6707291 | Self-induction-type position detector device for detecting object position Single coil to be excited by a predetermined A.C. signal is provided, with no secondary coil being provided. Magnetism-responsive member is movable relative to the coil so that a self-inductance of the coil progressively increases or decreases in response to displac... | 03/16/2004 |
| 6693420 | Control apparatus having a pulse induction position sensor Control apparatus comprising at least one electrically-conductive target portion (12). A position sensor (14) in the form of a pulse induction device is arranged in proximity with the said at least one electrically-conductive portion (12) to provide a sig... | 02/17/2004 |
| 6672175 | Apparatus and method for sensing an angle of relative rotation of rotors A rotation sensor provided with a first rotor fixed to a shaft, a second rotor fixed to the same or other shaft and adjoining the first rotor, and a core having a resonance coil, arranged around the first rotor, and which coil forms a magnetic circuit wor... | 01/06/2004 |
| 6670804 | Method for determining the angular position of a rotative part which performs a rotational movement A winding band including at least one conductor is arranged on a carrier in a housing, and is coupled to a rotative part, so that a wound-up length of a wound-up portion of the winding band varies corresponding to a rotational movement of the rotative par... | 12/30/2003 |
| 6664781 | Inductive proximity sensor with a differentially coupled energy source An inductive proximity switch includes an electrical resonant circuit and an energy source coupled therewith to compensate for losses in the resonant circuit. The energy source is fully differentially coupled with the resonant circuit at the input side.... | 12/16/2003 |
| 6664782 | Digital eddy current proximity system: apparatus and method A digital eddy current proximity system including a digital impedance measuring device for digitally measuring the proximity probes impedance correlative to displacement motion and position of a metallic target object being monitored. The system further i... | 12/16/2003 |
| 6661222 | Turbine blade clearance on-line measurement system A monitoring system for measuring the gap between a turbine blade and a stationery component of a turbine, includes an insertion probe having a sensor which is moved radially within the gap to a pre-selected distance from the turbine blade as measured by ... | 12/09/2003 |
| 6661219 | Apparatus having an electromagnetic actuator including an armature and at least one inductive element connected to the armature for determining the position of the armature An apparatus having an electromagnetic actuator for operating an actuating element, in particular an inlet or exhaust valve of an internal combustion engine, which includes an electromagnetic unit via which an armature which is mounted such that it may mo... | 12/09/2003 |
| 6650106 | Device for eddy current measurement of a motion of a conducting body in a magnetic field A motion parameter of an at least partially conducting moving body is measured with a measuring device having at least one coil with a coil axis tangential to the motion direction of the moving body. A primary magnetic field induces electrical currents in... | 11/18/2003 |
| 6650111 | Pulsed excited proximity sensor A proximity sensor has a transducer coil that is part of an oscillator circuit. The oscillating signal varies as a function of the presence or absence of a metallic object adjacent the transducer coil. By analyzing selected characteristics of that oscilla... | 11/18/2003 |
| 6643909 | Method of making a proximity probe Method of making a proximity probe including providing a preform having an interior cavity accessible by an opened rearward end; coupling a coil to the preform proximate a forward most end of the preform for defining an assembly; locating a single support... | 11/11/2003 |
| 6617845 | Proximity sensor resistant to environmental effects A housing for a proximity sensor is resistant to harsh environmental effects, such as scorching particles due to sputtering in a welding environment. The sensor housing is formed of a material having a high thermal conductivity, such as copper or an alloy... | 09/09/2003 |
| 6605939 | Inductive magnetic saturation displacement sensor A sensor system includes a coil positioned on a thin substrate sandwiched to a layer of mumeta, a high magnetic permeability material. The mumetal acts as an amplifier for the inductance L measured at the terminals of the coil. When a magnet passes in fro... | 08/12/2003 |
| 6600311 | Magnetic sensor for detecting the angular displacement of a rotating shaft A sensor is configured to comprise a detection coil 1 into which a metallic shaft 2 to be detected, a reference coil 5 having the same specifications as those for the detection coil 1, drive oscillator circuits 3, 6 for generating high-frequency magnetic ... | 07/29/2003 |
