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7372256 |
Rotation sensor
A rotation sensor including a rotor mounted to a rotating shaft and having a conductive sensing unit which varies in width circumferentially thereof; and stationary cores each having an exciting...
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7336069 |
Eddy current sensor and sensor coil for the same
The invention pertains to an eddy current sensor with a sensor circuit having a head portion, including a sensor coil, a base portion and a transmission cable connecting the head portion to the...
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7323867 |
Apparatus which detects the thickness of a sheet of paper such as a bank note
A thickness detecting apparatus comprises a printed board in a part of which a coil is patterned, a detection roller which is disposed near the coil, which detects thickness of a sheet P of paper...
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7323863 |
Inductive transducer measurement system
An inductive transducer measurement system is provided. A measuring circuit simultaneously drives a plurality of transducer windings and measures their inductance by using a load impedance in an...
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7320817 |
Holding structure and a molding with the same
A holding structure includes a held member located in a case, and a guiding space defined between the held member and a predetermined inner surface of the case. A primary molding resin is guided...
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7288933 |
Position detecting system that self-monitors for connectivity faults
A system for detecting position that is capable of self-monitoring for connectivity faults. In one embodiment, the system comprises a transformer, an excitation potential source, a bias potential...
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7262595 |
Segmented core for an inductive proximity sensor
An inductive proximity sensor for sensing the presence of target based on a change of inductance in the sensor. The sensor includes a coil and a core formed of a permeable material so as to form an...
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7259552 |
Wear monitor for turbo-machine
A measurement device for measuring the wear of turbo-machine components to reduce the likelihood of component failure while a turbine-machine is at load. The measurement device is capable of...
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7255128 |
System and method for detecting flow in a mass flow controller
Systems and methods are provided for detecting flow in a mass flow controller (MFC). The position of a gate in the MFC is sensed or otherwise determined to monitor flow through the MFC and to...
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7248994 |
Digital method and apparatus for sensing position with a linear variable differential transformer
An apparatus and method for determining a linear position from a linear variable differential transformer (LVDT) including a primary coil driven by an excitation signal, and two secondary coils...
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7245121 |
Device and method for determining the path of a target
The invention relates to a device for determining the path of an in particular metallic target, with at least two detection devices so positioned along a path to be monitored that the sensitivity...
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7239133 |
Methods and systems for controlling the temperature stability of an inductor
Methods and systems a method of assembling a proximity probe are provided. The method includes determining a coil wire dimension and coil geometry for the probe such that a resistance versus...
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7216054 |
Electromagnetic method and apparatus for the measurement of linear position
A method and apparatus are disclosed for monitoring a linear position, such as the distance between a sensing element and a movable object, and/or related parameters, such as displacement,...
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7183761 |
Rotation sensor
In a rotation sensor including a rotor 10 mounted to a rotating shaft S and having a conductive sensing unit 12 whereof the width varies in the circumferential direction; and stationary cores ...
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7145325 |
Displacement detection apparatus and displacement detection method
Improving reducing or eliminating the effects of variation in characteristics of the resonance circuit in a resonance type displacement detection apparatus, so as to improve displacement detection...
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7135855 |
Simplified inductive position sensor and circuit configuration
Inductive position sensors and circuit configurations are disclosed for the measurement of linear, rotary, or curved position along a motion axis. The simplified sensor structures combine one or...
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7129701 |
Method of inductive proximity sensing
A method of non-intrusive, inductive proximity sensing of a target through a conductive barrier comprises the steps of: disposing an inductive proximity sensor on one side of a barrier of...
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7121300 |
Device for measuring the lift of poppet valves
A device for measuring the height of lift of poppet valves, in particular for poppet valves installed in internal combustion engines, with the help of inductive pickups, including a coil in a...
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7092196 |
Characteristic measurement of an actuation drive coil and associated damping mechanism
A system and method for analyzing a coil actuator of a type having a coil and a magnet. A current source selectively applies a first current to a coil of a coil actuator for setting a moveable part...
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7075293 |
Method for inductive distance measurement, and a working head for carrying out this method using an induction coil
An inductive measurement is carried out of the distance between a workpiece ( 3 ) and a working head ( 1 ), which bears an induction coil ( 8 ), through which an alternating current flows and which...
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7068028 |
Method and apparatus for metal target proximity detection at long distances
A method and system for detecting a position of a metallic object are disclosed. The method includes (a) exciting a coil with an electrical signal to produce an electromagnetic field enveloping the...
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7061230 |
Circuit and method for measuring distances
A circuit for measuring distances and which has at least two inputs ( 1, 2 ), at least one measuring coil ( 3 ), and at least one signal source, wherein at least two input signals (e pos , e neg )...
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7057399 |
Resolver circuit including BTL amplifier
A resolver circuit including a signal generation circuit, a bridge tied load amplifier, a resolver, and a resolver processing circuit is provided. The signal generation circuit is configured to...
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7053602 |
Rotation sensor and method for detecting a rotation angle of a rotating member
A rotation sensor includes a rotor rotatable together with an automotive steering shaft, a conductive band formed on the rotor, a magnetic coil/core unit fixed near the rotor, the unit having a...
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7045996 |
Position determination based on phase difference
A method for determining position of a device includes generating at least two, time-varying, magnetic fields using inductive elements, wherein the fields have differing phases. The method further...
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7034522 |
Method and apparatus for measuring movement, displacement and/or deformation
A non-contact rotation speed and torque sensing device which uses the natural inhomogeneities in the magnetic properties of a rotating element ( 4 ) to measure movement, displacement and...
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7019661 |
Axial bearing wear detection device for canned motor
An axial position detection circuit detects the axial position of a rotor from the difference in voltages generated at axial position detection coils disposed at both ends in the axial direction of...
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7017701 |
Inclination-measuring device
An inclination-measuring apparatus for use with a motor vehicle includes a rotary sensor connected to the motor vehicle, the rotary sensor selected from one of a rotary position sensor and a rotary...
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7009389 |
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...
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6985822 |
Methods and systems for proximity system target material variation effects reduction
A method of determining a gap defined between an eddy current proximity transducer and a target is provided. The method includes populating a data structure with data points that are relative to a...
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6965230 |
Apparatus and method for determining the position of the end of a threaded connection, and for positioning a power tong relative thereto
Apparatus and method for positioning a power makeup/breakout device, commonly referred to as a “power tong unit,” along the longitudinal axis of a tubular, with respect to the end of a...
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6965228 |
Proximity switch encapsulated in a plastic housing and having a shield
A proximity switch having a coil former ( 3 ) which is fitted with at least one coil ( 4, 5, 6 ), has an associated board ( 8 ) and is held by a plastic housing ( 1 ), and having an electrically...
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6949922 |
Turbine blade clearance on-line measurement system
A system ( 90 ) for measuring the gap ( 16 ) between a rotating blade ( 14 ) and a stationary component ( 12 ) of a turbo-machine, including an eddy current coil ( 30 ) and an eddy current tester (...
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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,...
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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...
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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...
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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...
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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,...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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 (...
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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,...
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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...
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