Class / Patent application number | Description | Number of patent applications / Date published |
324207180 | Differential type (e.g., LVDT) | 28 |
20090033316 | SENSOR FOR POSITION AND GAP MEASUREMENT - An apparatus including a controller, a transport in communication with the controller having a movable portion and a transport path and a multi-dimensional position measurement device in communication with the controller, the multi-dimensional position measurement device including a plurality of transformers and at least one element attached to the movable portion, wherein the multi-dimensional position measurement device is configured so that a circuit is completed in at least one plurality of transformers as the at least one element passes proximate to the at least one of the plurality of transformers and the controller is configured to calculate a multi-dimensional position of the movable object based on an output of the at least one of the plurality of transformers, wherein the multi-dimensional position includes at least a gap between the movable portion and the plurality of transformers. | 02-05-2009 |
20100085039 | POSITION SENSOR - A plurality of layers of flat coils are stacked and connected in series with each other to form a single coil pole, and the coil pole is energized by an A.C. signal. Magnetism-responsive member, provided to be opposed to the coil pole in a non-contact manner, is displaced relative to the coil pole, so that correspondency, to the coil section, of the magnetism-responsive member varies in response to variation in the relative position and thus impedance variation occurs in the coil pole. Position detection signal is provided on the basis of an output signal, responsive to the impedance variation, taken out from the coil pole. | 04-08-2010 |
20100213930 | Integrated micro actuator and lVDT for high precision position measurements - 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. | 08-26-2010 |
20120139531 | POSITION DETECTING SYSTEM - A position detecting system for a differential movement system which moves a first surface and a second surface from a fixed surface includes an actuation system to move the second surface relative to the first surface and to allow the second surface to move with the first surface; a sensor connected to the actuation system to detect a parameter of the actuation system related to an expected amount of movement of the second surface to determine the expected amount of movement of the second surface; and a sensor system connected to the second surface and the fixed surface to detect the amount of actual movement of the second surface. | 06-07-2012 |
20120176124 | Method and Apparatus for a Half-Bridge Variable Differential Transformer Position Sensing System - 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. | 07-12-2012 |
20120194176 | ELECTRONIC INTERFACE FOR LVDT-TYPE PRESSURE TRANSDUCERS USING PIEZORESISTIVE SENSORS - A transformer-less, solid-state pressure transducer assembly having significantly better characteristics than the electro-mechanical assemblies of the prior art. The pressure transducer assembly of the present invention achieves the many of the same functions as transducer assemblies of the prior art having transformers, however the pressure transducer assembly of the present invention is smaller in size and weight, cost less to manufacture, and has increased reliability. | 08-02-2012 |
20120194177 | MINIMIZING MAGNETIC INTERFERENCE IN A VARIABLE RELUCTANCE RESOLVER EXCITED BY 180 DEGREE DIFFERENTIAL SIGNALS - A multi-pole variable reluctance resolver is balanced wired and driven by 180 degree differential signals. Capacitive passive elements may be serially added to the resolver to minimize magnetic interference and cancel flux between poles of the same polarity and orthogonal poles, as well as minimize the effect of input driving signal distortion. Symmetric networks of resistive and capacitive elements may also be added to the resolver to overcome noise sensitivity associated with balanced wired resolvers. | 08-02-2012 |
20130009631 | VARIABLE RELUCTANCE TYPE ANGLE SENSOR - 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. | 01-10-2013 |
20130057263 | SYSTEM AND METHOD FOR POSITION SENSING - A system for position sensing includes an incremental track including a plurality of sectors and a measurement subsystem. The measurement subsystem includes at least two differential read-heads each having at least one primary coil and at least two differential secondary coils, the at least two differential secondary coils of one of the at least two differential read-heads configured to generate output signals having their amplitudes modulated by the sectors of the incremental track and the at least two differential secondary coils of the other of said two differential read-heads configured to generate output signals having their amplitudes modulated by the sectors of the incremental track. | 03-07-2013 |
20130127449 | POSITION SENSOR, ACTUATOR-SENSOR DEVICE AND METHOD FOR THE INDUCTIVE DETECTION OF A POSITION - A position sensor for the inductive detection of a position of a first component comprising a reference coil with respect to a second component comprising a reference body. A control and processing unit of the position sensor is coupled to the reference coil and is designed for issuing an output signal generating a current impulse in the reference coil. In addition, the control and processing unit is designed for evaluation of an oscillation generated by the current impulse in the reference coil as an input signal indicating the position of the reference body. | 05-23-2013 |
20130221954 | ANTI-BACKLASH COUPLER - Disclosed are devices, systems, assemblies, couplers, and other implementations, including a coupler that includes a first coupling element matingly engaged to a second coupling element, each of the first and second coupling elements including a plate defining an opening, a projection extending from a first surface of the plate, and a socket extending from a second surface of the plate and configured to receive a rotatable member. The projection of the first coupling element is received in the opening of the plate of the second coupling element, and the projection of the second coupling element is received in the opening of the plate of the first coupling element. The matingly engaged coupling elements are configured to rotate in response to rotation of a first rotatable member of a first device received in the socket of the first coupling element. | 08-29-2013 |
20130271121 | RESOLVER - 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. | 10-17-2013 |
20130314078 | Integrated Micro Actuator and LVDT for High Precision Position Measurements - 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. | 11-28-2013 |
20140159709 | MEASUREMENT DEVICE - 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. | 06-12-2014 |
20140247041 | Instrument For Measuring Length, And Method And Device For Controlling The Size Of A Fuel Rod - 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. | 09-04-2014 |
20140306694 | DETERMINING DIRECTION OF AN OBJECT USING LOW FREQUENCY MAGNETIC FIELDS - 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. | 10-16-2014 |
20150028862 | STATOR STRUCTURE OF VR TYPE RESOLVER AND VR TYPE RESOLVER - 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. | 01-29-2015 |
20150035519 | SENSOR FOR INDICATING A POSITION OR A CHANGE IN POSITION OF A COUPLING ELEMENT AND METHOD FOR OPERATING THE SENSOR - 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. | 02-05-2015 |
20150042321 | ROTARY VARIABLE DIFFERENTIAL TRANSFORMER (RVDT) SENSOR ASSEMBLY WITH AUXILIARY OUTPUT SIGNAL - 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. | 02-12-2015 |
20150108969 | On-Chip Linear Variable Differential Transformer - A linear variable differential transformer (“LVDT”) including a semiconductor substrate and a plurality of coils formed at least partially on the substrate. | 04-23-2015 |
20150115938 | MAGNETIC FIELD DETECTION DEVICE - 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. | 04-30-2015 |
20150145507 | TRANSFORMER POSITION SENSOR WITH SHORTED COIL - 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. | 05-28-2015 |
20150308862 | Transducer Assembly with Digitally Created Signals - Techniques for coupling with devices that convert displacements into differential voltages and improve the sensitivity of such devices. A transducer operates based on changes of inductances between primary and secondary of a transformer to produce a differential signal that includes a noninverted signal and an inverted signal. A switch receives the noninverted signal and the inverted signal. A processor creates a square wave signal for driving the transducer input, and also digitally creates an inverted transducer output. A filter operates to filter the square wave output from the processor to produce a substantially single frequency signal at a specified timing having a specified phase relationship relative to the first phase inversion signal based on instructions that are executed by the processor. | 10-29-2015 |
20150362341 | APPARATUS FOR OPERATING A RESOLVER, RESOLVER DEVICE AND METHOD FOR OPERATING A RESOLVER DEVICE - 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. | 12-17-2015 |
20160033256 | ELECTRONIC INTERFACE FOR LVDT-TYPE PRESSURE TRANSDUCERS USING PIEZORESISTIVE SENSORS - Aspects of the present disclosure relate to a method that includes receiving, at first and second input terminals, first and second input voltages and maintaining the direction of the first and second input voltages and doubling the first and second input voltages. The method also includes measuring, by a Wheatstone bridge, an applied physical parameter; outputting, to a capacitor, and to first and second operational amplifiers, first and second signals substantially indicative of the physical parameter; reducing, by the capacitor, a DC component of the first and second signals; amplifying, by the first and second operational amplifiers, the first and second signals; and adjusting, by a gain resistor, a differential output between first and second output voltages that correspond to the first and second signals output from the Wheatstone bridge. Finally, the method includes outputting, by first and second output terminals, the first and second output voltages. | 02-04-2016 |
20160033305 | MAGNETIC LINEAR OR ROTARY ENCODER - The invention relates to a magnetic linear or rotary encoder ( | 02-04-2016 |
20160109267 | SMART LOWER END - A smart lower end system that can detect multiple events and failures during the generation of pressure pulses by a pulser is disclosed. Pulser failures may occur if the pilot valve fails to fully close or open, if the signal shaft fails to move and close pilot valve orifice, or if movement of the pilot valve or signal shaft is restricted. The components of the smart lower end system may cycle between sleep and wake states to allow for low power operation. | 04-21-2016 |
20160187163 | DIFFERENTIAL TRANSFORMER MAGNETIC PERMEABILITY SENSOR - Provided is a differential transformer magnetic permeability sensor that accurately suppress a variation of output level of each sensor even if a position shift occurs in forming a detection coil, a reference coil, and a drive coil as planar coils. The differential transformer magnetic permeability sensor includes a first coil layer including a first drive coil constituted of a first wire of a flat winding and a detection coil constituted of a second wire of a flat winding, a second coil layer including a second drive coil constituted of a third wire of a flat winding and a reference coil constituted of a fourth wire of a flat winding. The first drive coil and the second drive coil are connected so that drive current have the same direction, while the detection coil and the reference coil are connected so that induced current have opposite directions. | 06-30-2016 |