scholarly journals New Electromagnetic Force-Displacement Sensor

2016 ◽  
Vol 6 (2) ◽  
pp. 560
Author(s):  
Amine Benabdellah ◽  
Zakarya Abbassi ◽  
Abdelrhani Nakheli
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Force ◽  
Force Sensor ◽  
Sensor Response ◽  
Displacement Sensor ◽  
Measuring Instruments ◽  
Active Elements ◽  
Average Accuracy ◽  
Force Displacement ◽  
The Magnetic Field

A new electromagnetic force-displacement sensor is presented. Its operating principle is based on the fundamental laws of electromagnetism (Faraday-Lenz law) and the mechanical properties of a spring. The active elements are two coils made by a wire of 60 µm in diameter. Using different wire diameters or different number of wire turns in the coil modify the intensity of the magnetic field and the sensor response. The average accuracy of the sensor is about ∆d=1µm, and as a force sensor is about ∆F=1µN. This sensor could be successfully used for the manufacture of several measuring instruments.

New Electromagnetic Force-Displacement Sensor

2016 ◽  
Vol 6 (2) ◽  
pp. 560
Author(s):  
Amine Benabdellah ◽  
Zakarya Abbassi ◽  
Abdelrhani Nakheli
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Force ◽  
Force Sensor ◽  
Sensor Response ◽  
Displacement Sensor ◽  
Measuring Instruments ◽  
Active Elements ◽  
Average Accuracy ◽  
Force Displacement ◽  
The Magnetic Field

A new electromagnetic force-displacement sensor is presented. Its operating principle is based on the fundamental laws of electromagnetism (Faraday-Lenz law) and the mechanical properties of a spring. The active elements are two coils made by a wire of 60 µm in diameter. Using different wire diameters or different number of wire turns in the coil modify the intensity of the magnetic field and the sensor response. The average accuracy of the sensor is about ∆d=1µm, and as a force sensor is about ∆F=1µN. This sensor could be successfully used for the manufacture of several measuring instruments.

scholarly journals Precision Analysis and Design of Rotating Coil Magnetic Measurements System

2020 ◽  
Vol 10 (23) ◽  
pp. 8454
Author(s):  
Soontorn Odngam ◽  
Chaiyut Preecha ◽  
Prapaiwan Sanwong ◽  
Woramet Thongtan ◽  
Jiraphon Srisertpol
Keyword(s):  
Magnetic Field ◽  
Control System ◽  
Magnetic Measurements ◽  
Speed Control ◽  
Measuring Instruments ◽  
Dipole Magnet ◽  
Analysis And Design ◽  
Speed Control System ◽  
The Impact ◽  
The Magnetic Field

This research presents the design and construction of measuring instruments for a dipole magnetic field using a rotating coil technique. This technique is a closed-loop speed-control system where a Proportional-Integral (PI) controller works together with the intensity measurement of the magnetic field through the rotating coil. It was used to analyze the impact on the accuracy of the electromagnetic at speed ranges of 60, 90, and 120 rpm. The error estimation in the measurement of the normal dipole and skew dipole magnet caused by the steady-state error of the speed control system and the rotational search coil in whirling motion are demonstrated. Rotating unbalance, shaft coupling, and misalignment from its setup disturbed the performance of the speed control system as a nonlinear system.

Magnetohydrodynamic stability of a streaming gas jet

1993 ◽  
Vol 49 (1) ◽  
pp. 3-15
Author(s):  
Samia S. Elazab
Keyword(s):  
Magnetic Field ◽  
Capillary Force ◽  
Electromagnetic Force ◽  
Radial Distance ◽  
Gas Jet ◽  
Axisymmetric Perturbation ◽  
Mhd Stability ◽  
The Magnetic Field

The MHD stability of a gas jet surrounded by a streaming radially finite liquid cylinder (with solid cylindrical edge) is studied. The system is acted upon by capillary, electromagnetic and inertial liquid forces. The eigenvalue relation is established to all kinds of perturbations. The streaming has a strong destabilizing influence that is independent of all problem parameters. The capillary force is destabilizing only for small axisymmetric modes and stable for the rest. The electromagnetic force is strongly stabilizing whatever the intensities of the magnetic field. If the influence of the latter is sufficiently strong, the influence of the streaming can be completely suppressed. It is found that for an axisymmetric perturbation the domain of instability is the same whatever the value of the liquid radial distance.

A Novel Active Online Electromagnetic Balancing Method—Principle and Structure Analysis

2012 ◽  
Vol 134 (3) ◽  
Author(s):  
Shilei Ma ◽  
Shiyuan Pei ◽  
Lin Wang ◽  
Hua Xu
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Force ◽  
Magnetic Force ◽  
Cutting Tools ◽  
Field Analysis ◽  
Iron Core ◽  
Machining Processes ◽  
Magnetic Field Analysis ◽  
Precision Finishing ◽  
The Magnetic Field

Vibrations caused by the imbalance of a rotor are a frequently encountered problem in machining processes. Especially in high-precision finishing, the workpiece quality is strongly related to the vibration of the machine-tool spindle, which is mainly caused by mass imbalance and cannot be completely eliminated in cutting tools with nonaxisymmetrical structures. An imbalance in centrifugal force is generated by rotor rotation and increases rapidly with rotational speed. A novel active online electromagnetic balancing method based on static magnetic-field analysis is proposed, and an active online electromagnetic balancing device (AOEBD) based on this method was developed under these conditions. The magnetic-field distribution and electromagnetic force generated by the device were analyzed by finite-element modeling. The influence on the electromagnetic force of the misalignment between the rotor and the iron core was investigated. Factors influencing the magnetic force of the device were determined, and reasonable reference values were suggested. The critical eccentricity was also provided. Experiments had been done at last, and the experimental results presented a good performance of this kind of balancing device.

scholarly journals Dynamic characteristics of a bitable linear actuator with moving permanent magnet

2004 ◽  
Vol 1 (2) ◽  
pp. 207-214 ◽  
Author(s):  
Ivan Yatchev ◽  
Krastio Hinov ◽  
Vultchan Gueorgiev
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Dynamic Characteristics ◽  
Electromagnetic Force ◽  
Electrical Circuit ◽  
Field Analysis ◽  
Linear Actuator ◽  
Grid Data ◽  
Magnetic Field Analysis ◽  
The Magnetic Field

The dynamic characteristics of an ax symmetrical linear actuator with axially magnetized moving permanent magnet are obtained using combined field and circuit approach. The magnetic field of the actuator has been analyzed using the finite element method over a current-displacement sampling grid. Two field analyses are carried out for each point of the grid - one for the real system and one for the system where the permanent magnet is considered as a soft magnetic body. For each point of the grid, data for the total flux linkage, electromagnetic force and the coil inductance are extracted from the magnetic field analysis. These data are approximated by bicubic spline functions, which are employed in the solution of the system of ordinary differential equations of the electrical circuit and the mechanical motion. Results are obtained for the time variations of the coil current, mover displacement, mover velocity and electromagnetic force. The results for the current and displacement are verified experimentally.

scholarly journals New Electromagnetic Force-Displacement Sensor

10.11591/542 ◽  
2016 ◽  
Vol 5 (3) ◽  
Author(s):  
Amine Benabdellah ◽  
Zakarya Abbassi ◽  
Abdelrhani Nakheli
Keyword(s):  
Electromagnetic Force ◽  
Displacement Sensor ◽  
Force Displacement

Effect of the Processing Conditions on the Mechanical Properties of Urethane Magnetorheological Elastomers

2008 ◽  
Vol 587-588 ◽  
pp. 630-634 ◽  
Author(s):  
Anna Boczkowska ◽  
Stefan F. Awietjan
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Carbonyl Iron ◽  
Magnetic Field Effect ◽  
Displacement Sensor ◽  
Compression Tests ◽  
Iron Particles ◽  
Magnetorheological Elastomers ◽  
Chemical Company ◽  
The Magnetic Field

The aim of the study was to develop an innovative processing method of magnetorheological elastomers (MRE). This method comprises optimization of the MRE structure in the context of their performance in the magnetic field. The influence of the amount of ferromagnetic particles and their arrangement in relation to the external magnetic field was investigated. Urethane magnetorheological elastomers were manufactured using polyurethane gels, supplied by Dow Chemical Company. As the ferromagnetic carbonyl–iron powder with particles size from 6-9)m produced by Fluka was used. The amount of the carbonyl iron particles was varied from 1.5 to 33.0 vol. %. Magnetic field strengths used during the fabrication of MRE were 0.1 and 0.3 T. The samples with particle chains aligned or slopped at 45 degree to the long sample axis were produced. To evaluate the external magnetic field effect on the magnetorheological properties a deflection in the magnetic field was measured. Samples were placed parallel to the magnetic field lines and deflected prior to the application of a magnetic field. After the application of the magnetic field the sample tended to straighten which was measured by displacement sensor. Magnetic field in a range of 0-0.9 T has been applied. Also the compression tests were carried out without and within external magnetic field with the strength of 0.3 T. The experiment showed that application of the magnetic field increases stiffness of the material. The amount of iron particles and their arrangement have influence on the stress-strain curves course.

scholarly journals New Electromagnetic Force-Displacement Sensor

2016 ◽  
Vol 5 (3) ◽  
Author(s):  
Amine Benabdellah ◽  
Zakarya Abbassi ◽  
Abdelrhani Nakheli
Keyword(s):  
Electromagnetic Force ◽  
Displacement Sensor ◽  
Force Displacement

Observing the galactic magnetic field

1967 ◽  
Vol 31 ◽  
pp. 375-380
Author(s):  
H. C. van de Hulst
Keyword(s):  
Magnetic Field ◽  
Fair Agreement ◽  
Solar Neighbourhood ◽  
Galactic Magnetic Field ◽  
The Magnetic Field

Various methods of observing the galactic magnetic field are reviewed, and their results summarized. There is fair agreement about the direction of the magnetic field in the solar neighbourhood:l= 50° to 80°; the strength of the field in the disk is of the order of 10-5gauss.

Evolution of Large-Scale Coronal Structures

1994 ◽  
Vol 144 ◽  
pp. 29-33
Author(s):  
P. Ambrož
Keyword(s):  
Magnetic Field ◽  
Field Line ◽  
Large Scale ◽  
Coronal Magnetic Field ◽  
Source Surface ◽  
Solar Cycles ◽  
Characteristic Relationship ◽  
The Magnetic Field ◽  
Coronal Structures

AbstractThe large-scale coronal structures observed during the sporadically visible solar eclipses were compared with the numerically extrapolated field-line structures of coronal magnetic field. A characteristic relationship between the observed structures of coronal plasma and the magnetic field line configurations was determined. The long-term evolution of large scale coronal structures inferred from photospheric magnetic observations in the course of 11- and 22-year solar cycles is described.Some known parameters, such as the source surface radius, or coronal rotation rate are discussed and actually interpreted. A relation between the large-scale photospheric magnetic field evolution and the coronal structure rearrangement is demonstrated.

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