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8169213 |
Magnetic field analysis method, magnetization analysis device, and recording medium with computer program
It is possible to perform accurate magnetization analysis by considering the magnetic state of an incomplete magnetic region. A magnetization analysis device performs magnetization analysis by...
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8065050 |
Method and apparatus for detecting an insufficient phase current in a permanent magnet synchronous motor
A method is provided for detecting an insufficient or missing phase current in a permanent magnet synchronous motor, and includes determining a composite vector position of a combined three-phase...
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7952346 |
Method for estimating the magnetization level of one or more permanent magnets established in one or more permanent magnet rotors of a wind turbine generator and wind turbine
A method for estimating the magnetization level of one or more permanent magnets established in one or more permanent magnet rotors of a wind turbine generator includes the steps of: establishing...
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7441324 |
Method for preventing magnetic damage to a GMR head during back-end processing
A method is provided for preserving the transverse biasing of a GMR (or MR) read head during back-end processing. In a first preferred embodiment, the method comprises magnetizing the longitudinal...
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7023201 |
Magnetic position sensor apparatus and method
A magnetic position sensor has a stator (16′, 36, 52) formed of magnetic material and a pair of magnets (14a, 14b; 34a, 34b; 54a, 54b; 64a, 64b) rotatably mounted about the stator and movable b...
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6937007 |
Magnet field symmetry for hall sensor
A method for balancing the flux density of a permanent magnet includes sensing flux density in a permanent magnet and if unbalanced relative to a physical center, adjusting the cross-sectional area...
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6873151 |
Sensor assembly for sensing angular position
A sensor assembly for sensing angular position of an object is provided. The assembly may comprise at least one magneto-sensing magnet having a second axis of rotation. The assembly may further...
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6724184 |
Device and method for determining a magnetic field as to its intensity and direction
A device and a method for determining a magnetic field with respect to its intensity and direction at at least one detection location, and uses a first arrangement for superimposing an auxiliary...
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6611142 |
Apparatus and method of measuring the multi-dimensional magnetic field distribution of a magnetic sample in real-time
An apparatus for measuring the magnetic field distribution of a magnetic sample includes a magnetic field sensor arrangement having three, orthogonally-disposed, Hall sensors for sensing the...
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6591202 |
Magnetic field measuring device
An apparatus and method that tests an NMR system, including MRI scanners, by taking H-B measurements for the apparatus at any stage during the manufacture thereof, to thereby detect any defects of...
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6201386 |
Method for demagnetizing and measuring remanence and coercivity characteristics of a magnetic sample
A method and apparatus for determining remanence and coercivity of high strength rare earth magnets, without full determination of their hysteresis characteristics and subsequent computation,...
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5929630 |
Magnetic flux sensor apparatus
A flux sensitive device for creating electrical signals from magnetic flux produced by a magnetic piece has a first member defining a surface for sliding the magnetic piece. A conductive trace and...
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5155433 |
Method and apparatus for testing bipolar magnets having a circular curvature
A bipolar magnet as used in magnetic disk drives is characterized by measuring field strength of the magnet along a plurality of radii using a Hall effect sensor which is incrementally indexed...
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5126669 |
Precision measurement of magnetic characteristics of an article with nullification of external magnetic fields
Apparatus for characterizing the magnetic field of a device under test includes a device for nullifying the ambient magnetic field in a test environment area with a constant applied magnetic field,...
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4806858 |
Liquid crystal nondestructive inspection of magnetization and variations in magnetization of high energy magnets
A method for coupling liquid crystals and a magnetic field to monitor changes in local magnetic properties (e.g., direction of magnetization) is provided. A magneto-optical sensor is used to detect...
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4804914 |
Method for determining force characteristic of a device for magnetically holding workpieces
A method for determining force characteristic of a device for magnetically holding workpieces placed on a top plate (3) of the device, wherein a workpiece (1) cooperating with a source of magnetic...
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4782293 |
Process for adjusting the magnetic field strength of permanent magnets
A description is given of a pulse device for zeroing a permanent magnet to any desired operating point on its demagnetization curve, in which the strength of the demagnetizing pulse is...
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4604573 |
Drift resistant magnet strength signal evaluation circuit
To test magnetic elements, by integrating output signals derived from a sensing coil to which the magnetic elements are exposed, by being passed therethrough, the output signals are additionally...
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4563236 |
Method for making large area stable domains
A method for producing a large area of single domain magnetic bistability is shown including the steps of selecting the properties of films of magnetic materials such that the saturation field (Hs)...
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4465974 |
Apparatus for measuring magnetic field characteristics of magnetic materials
Bodies of a ferrimagnetic material are disposed within small cavities provided in a magnetometer. The magnetometer is initially calibrated utilizing an electromagnet to produce an applied magnetic...
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4465975 |
Scanning apparatus and method for measuring a magnetic field produced by a sample
There is disclosed a technique for measuring the magnetic field of a sample, such as sheet material having one or more magnetic poles, including effecting relative movement between a magnetically...
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4340861 |
Method of measuring magnetic field characteristics of magnetic materials
Bodies of a ferrimagnetic material are disposed within small cavities provided in a magnetometer. The magnetometer is initially calibrated utilizing an electromagnet to produce an applied magnetic...
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4311961 |
Testing of enclosed electromagnetic relays
An apparatus for testing enclosed electromagnetic relays includes a probe displaceable into the relay enclosure to engage the movable contact thereof. The probe is associated with a force...
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4270087 |
Apparatus for testing permanent magnets using electro-magnets and Hall sensors
Apparatus for testing permanent magnets such as in a generator or alternator embodied in a fly wheel. The apparatus includes a testing head on which the fly wheel is placed for the purpose. The fly...
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4186340 |
Apparatus for measuring the magnetic strength of magnetic work pieces
What is disclosed is an apparatus for measuring the relative magnetic field strength of magnetic workpieces such as miniature permanent magnet rotors which, for example, are included in miniature...
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4156191 |
Method and apparatus for adjusting the magnetic coupling between a Hall Effect switch and a permanent magnet
A method and apparatus for setting the relative magnetic relationship between a Hall Effect switch with a given operating field strength and a permanent magnet to operate the switch and having a...
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4104591 |
Method of adjusting a permanent magnet by using a hypothetical demagnetization curve lower than the actual value
An element together with a prospective shunt load is magnetized to become a permanent magnet whereafter the magnet is stepwise demagnetized, actually along the demagnetization curve but due to load...
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4074197 |
System for rotating small permanent magnets while adjusting and simultaneously sensing the magnetic moments thereof
The present disclosure describes apparatus for the production of small permanent bar magnets accurately adjusted to a stable, predetermined value of magnetic moment. In accordance with the...
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4058763 |
Apparatus for automatically magnetizing permanent magnet bodies, measuring their magnetic retentivity and sorting them
An elongated generally U-shaped ferromagnetic yoke has a series of coils embedded in its leg portions at spaced positions along its length so that a magnet body can be moved along the length of the...
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4056770 |
Dynamo electric machine permanent magnet flux test apparatus which simulates actual flux conditions of the motor
To test the flux of circular segmental permanent magnets for assembly in permanent magnet dynamo electric machines, typically electric motors, a gauge is made of soft iron having an inner...
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RE29166 |
Magnetic flaw detector system for reciprocating pairs of leakage field detectors with means for adjusting the spacing between each pair of detectors
A non-destructive testing system for detecting longitudinal and transverse defects, simultaneously, in metallic tubes or pipes in which a plurality of essentially punctiform magnetic sensing...
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3706027 |
MATERIALS COUNTING SYSTEM UTILIZING PERMANENT MAGNETS AND THEIR ASSOCIATED FIELDS
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3478876 |
MAGNETIC PARTS SORTER
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3416368 |
MAGNETIC DRAFTING SYSTEM TEST APPARATUS
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3242386 |
Magnet stabilizing method and apparatus
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3235776 |
Permanent magnet stabilizer system and method
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3140441 |
Magnet tester utilizing a motordriven balancing network to determine plural discrete levels of energy
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3058054 |
Method and apparatus for core orientation
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2887882 |
Pressure-voltage transducing element
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2876415 |
Magnetic indicating device
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2869075 |
Magnet calibrating stabilizer
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2781127 |
Apparatus for testing magnets
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