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Class 73/862.333 - Detecting magnetostrictive or magnetoelastic property


Subclass of Class 73 - Measuring and testing
Definition: Subject matter wherein the sensing means senses a change
No. of patents: 299
Last issue date: 01/03/2012


1                
NumberTitleIssue Date
8087304Magnetoelastic torque sensor with ambient field rejection
The present invention involves a method and apparatus for canceling the effects of magnetic field noise in a torque sensor by placing three sets of magnetic field sensors around a shaft, the first set of field sensors being placed in the central region of the shaft ...
01/03/2012
8087305System including a magnet and first and second concentrators
A system including a first concentrator, a second concentrator, and a magnet. The first concentrator has a first partial hub. The second concentrator has a second partial hub aligned with the first partial hub to form a bore. The magnet is situated in the bore and t...
01/03/2012
8082805Magnetic sensor assembly
A sensor assembly for measuring or detecting a magnetic field, torsion, or mechanical tension has a magnetic or magnetizable electrically conductive conductor having a first section and thereadjacent a second section in which a helical anisotropy is or can be genera...
12/27/2011
8020455Magnetostrictive sensing systems and methods for encoding
A magnetostrictive measurement system having one or more encoded polarized magnetic regions disposed circumferentially about a shaft, wherein adjacent magnetic regions along a section of the shaft have opposing polarities. In one embodiment the shaft is hollow and t...
09/20/2011
8015885Torque detector
A torque detector (16) is provided with first and second units (38, 39). The first unit (38) includes a first synthetic resin (40) formed by molding a pair of magnetic flux collector rings (34A, 34B). The second unit (39
09/13/2011
8001849Self-compensating magnetoelastic torque sensor system
A magnetic torque transducer arrangement for self-compensating effects of external magnetic sources and temperature offset includes a shaft with at least one magnetized zone, at least one active magnetic field sensor and at least one passive magnetic field sensor di...
08/23/2011
8001850Sensor system including a magnetized shaft
A sensor includes a shaft and a magnetic sensor. The shaft may have at least one magnetized active region. The magnetic sensor may be configured to sense a magnetic field about the shaft, and may provide an output representative of torque applied to the shaft, shaft...
08/23/2011
7997152Magnetostrictive torque sensor and torque detection method
A magnetostrictive torque sensor that detects a torque of a rotating shaft and/or a stationary shaft by using a magnetostriction inverse effect that occurs on a shaft surface, the magnetostrictive torque sensor includes a first detection coil, a second detection coi...
08/16/2011
7987734Torque sensor
A torque sensor (50) detects an input torque input into a torsion bar (51) using a magnetic force generating part (60), a rotating magnetic circuit (69), a fixed magnetic circuit (90), and a magnetic sensor (98). The rotatin...
08/02/2011
7984657Method for operating a torque system configured to tighten a series of fasteners
A wireless-enabled tightening system for fasteners is disclosed. The system includes a visual designator configured to project an indicator onto a workpiece. The system also includes a torque wrench comprising a wireless transmitter and a means for identifying wheth...
07/26/2011
7966897Plating apparatus
A plating apparatus includes a plating tank for storing a plating liquid, and applies a magnetic alloy plating to a shaft-shaped member immersed in the plating liquid by using the shaft-shaped member as a cathode. The plating apparatus further includes a rotable mem...
06/28/2011
7954389Torque sensor and manufacturing method thereof
A torque sensor (50) comprises a magnetic collecting ring (91, 92) fitted into an annular groove (31, 32) formed on the inner periphery (38) of a housing (30). By providing a staking part (33, 34) on the inner periphery (...
06/07/2011
7938026Magnetostrictive torque sensor and electric steering system
A magnetostrictive torque sensor comprising: a magnetostrictive film provided on a ferromagnetic shaft; a bias magnetization device which applies a bias magnetic field to the shaft to magnetize the shaft; and a detection device which detects a change in magnetism of...
05/10/2011
7895906Sensor system including a magnetized shaft
A sensor includes a shaft and a magnetic sensor. The shaft may have at least one magnetized active region. The magnetic sensor may be configured to sense a magnetic field about the shaft, and may provide an output representative of torque applied to the shaft, shaft...
03/01/2011
7882753Magnetostrictive torque sensor and electric power steering apparatus
A magnetostrictive torque sensor includes first and second magnetostrictive films mounted on a pinion shaft and having different magnetic anisotropic properties, a first detecting coil disposed in facing relation to the first magnetostrictive film, a second detectin...
02/08/2011
7832289Devices and methods for detecting rates of change of torque
Sensors for outputting signals indicative of a rate of change of torque experienced by a magnetized member in response to a change in torque experienced by the member are described. Such sensors include at least one sense element capable of detecting a change in a m...
11/16/2010
7814803Torque sensor
A change in a magnetic resistance generated between a plurality of windows of a cylindrical member formed by a nonmagnetic material and a torsion bar is regarded to be a change in inductances of detecting coils to detect a steering torque. Coil yokes accommodating t...
10/19/2010
7806005Magnetostrictive torque sensor and electric power steering apparatus including the same
This magnetostrictive torque sensor includes: a shaft made of a magnetized material; a magnetostrictive portion provided on the shaft at a position distanced for a predetermined length from an end of the shaft; a detection coil that is arranged so as to face the mag...
10/05/2010
7784365Short stroke magnetic position sensor, in particular for measuring a steering column twist
A position sensor, which can detect a steering column twist of a first magnetic rotoric structure including a plurality of radially oriented magnets and a second statoric structure including two concentric gear rings extended by radially oriented teeth. The rotoric ...
08/31/2010
7757570Torque sensor with alignment system
A torque sensor for sensing torque in a rotatable shaft. The rotatable shaft is configured to rotate within a shaft housing. The sensor housing has a first end, a second end, and at least one sensing zone. At least one target zone is disposed on the rotatable shaft ...
07/20/2010
7752923Magnetostrictive torque sensor
A magnetostrictive torque sensor for detecting a torque includes an operating shaft, magnetically insulating layers, and magnetostrictive films. The operating shaft is adapted to be applied with an external torque. The magnetically insulating layers are formed of a ...
07/13/2010
7752921Magnetostrictive torque sensor
A magnetostrictive torque sensor includes a shaft having a magnetostrictive film; a detection coil for detecting a change in a magnetic property of the magnetostrictive film; and a cutoff circuit for supplying an excitation signal for detecting the change in the mag...
07/13/2010
7752922Magnetostrictive torque sensor and method for manufacturing same
A magnetostrictive torque sensor for detecting a torque comprises an operating shaft, a first hollow shaft, a second hollow shaft, a first magnetostrictive film, and a second magnetostrictive film. Torque acts on the operating shaft from the outside. The first and s...
07/13/2010
7735382Magnetostrictive mechanical quantity sensor and method for manufacturing same
A magnetostrictive mechanical quantity sensor for detecting torque or axial force is disclosed, which sensor comprises a hollow shaft and an operation shaft. The hollow shaft has a magnetostrictive film formed on its outer perimeter surface. The operation shaft is s...
06/15/2010
7661324Magnetostrictive torque sensor and electric power steering apparatus
This magnetostrictive torque sensor 10 includes a rotating shaft 11 used to rotate according to an input torque and provided with magnetostrictive films 14A and 14B, an excitation coil 12 configured to apply an alternating magnetic...
02/16/2010
7658120Magnetostrictive torque sensor
A magnetostrictive torque sensor of the present invention is provided with: a magnetostrictive film; a detection coil; a current direction switching device; and an inversion device, wherein: when the current flows in a direction from one side to another side of the ...
02/09/2010
7640815Magnetostriction type torque sensor
A magnetostriction type torque sensor is provided which includes magnetic property change material which is provided on a shaft and whose magnetic property changes in accordance with torque applied to the shaft, an excitation signal generator which generates an exci...
01/05/2010
7631564Direct shaft power measurements for rotating machinery
Direct shaft power measurements of rotating machinery, including a magnetic encoding system for the shaft, having at least one conducting member having a first end and a second end which is disposed proximate the shaft with a gap between the member and the shaft. Th...
12/15/2009
7614313Method of generating and measuring torsional waves in cylindrical structure using magnetostrictive effect, and magnetostrictive transducer and structure diagnosis apparatus using the method
A method and apparatus for generating and measuring a torsional wave in a rod, shaft or pipe using magnetostriction are provided. The magnetostrictive transducer includes at least one strip attached to a predetermined position of a rod member, an insulator disposed ...
11/10/2009
7584673Magnetostrictive torque sensor (magnetic erasing)
A magnetostrictive torque sensor includes a magnetostrictive portion provided on a shaft. At least one torque detection coil is disposed opposite the shaft. The at least one torque detection coil detects a torque applied to the shaft. A demagnetization circuit (C) d...
09/08/2009
7581455Magnetostrictive torque sensor and electric power steering apparatus
A magnetostrictive torque sensor includes a rotating shaft rotatably supported; magnetostrictive materials provided on a surface of the rotating shaft, magnetic permeability of which changes according to the magnitude of rotary torque acting on the rotating shaft; a...
09/01/2009
7568400Torque detecting apparatus
A torque detecting apparatus is provided which is capable of easily positioning a magnetic sensor in relation to a corresponding pair of magnetism collecting projections and thus improving the detection accuracy of the magnetic sensor without increasing the number o...
08/04/2009
7555963Torque sensor
A torque sensor is provided in which a magnetic body can be easily positioned and fixed, and in which an excessive force is prevented from being exerted on a resin or the magnetic body when the magnetic body is press-fitted to a shaft, whereby no resin is damaged, a...
07/07/2009
7493831In-bearing torque sensor assembly
The present disclosure provides a device for sensing a torque applied through a shaft (18). The device includes a shaft (18) and a bearing (40) attached to the shaft (18). The bearing (40) includes an inner race (44), an out...
02/24/2009
7493832Fabrication of a magnetoelastic torque sensor
A method of fabricating a magnetoelastic torque sensor includes plating a magnetoelastic material to a magnetically inert substrate, and its endowment with uniaxial magnetic anisotropy through the creation within the transducer element of stress anisotropy. The plat...
02/24/2009
7478567Eddy current sensor assembly for shaft torque measurement
The present disclosure provides a device for sensing a torque applied through a shaft 18. The device comprises a magnetoelastic ring 24 press-fitted onto the shaft 18 and an excitation coil 2 placed in close proximity to the ring 24
01/20/2009
7478568Magnetostrictive torque sensor system and electric power steering apparatus employing the same
A magnetostrictive torque sensor system stabilizes and detects steering torque applied to a steering shaft. The sensor system comprises magnetic-characteristic variation parts that are provided to the steering shaft, wherein magnetic characteristics of the magnetic-...
01/20/2009
7426877Device for determining the actual reversal of the direction of rotation of a reversing rotational drive
A device for determining the actual reversal of the direction of rotation of a rotational drive continuing to operate after previous switching of the direction of rotation, in particular for window lifting systems or sliding roof drives in a motor vehicle, has a sen...
09/23/2008
7415899Torque detecting apparatus
The number n of N-poles and S-poles circumferentially aligned on the cylindrical magnet that integrally rotates with the first shaft is determined so as to be a greatest integer that satisfies the following formula that includes a maximum value Tmax (Nm) ...
08/26/2008
7412906Steering system torque sensor
A sensor apparatus for a power steering system on a vehicle, where the apparatus includes an input shaft for receiving a steering input and for rotating about a rotational axis. An output shaft is provided for transmitting the steering input from the input shaft to ...
08/19/2008
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