Analysis of the Magnetic Flux Distribution in a New Shifted Non-Segmented Grain Oriented AC Motor Magnetic Circuit

A novel design of magnetorheological fluids (MRF) based surround device in a loudspeaker system was studied in this article. The main objective of this research is to design a new surround device of the loudspeaker that can be easily controlled its damping. Therefore, it was predicted that the audio pressure level on the loudspeaker could be easily manipulated at a different sound source by applying a certain magnetic field. This function could not be reached using one conventional speaker system. Firstly, a set of an electromagnetic device containing MRF was designed to replace the conventional rubber surround. The magnetic circuit was then evaluated using the finite element method magnetics to study the flux distribution in the MRF area. The current was varied from 0.25 to 0.75 A by an interval of 0.25 A. The magnetic flux resulted from the simulation was then logged and used as the based value for predicting the change of shear yield stress. The base properties of the shear yield stress of the MRF against the magnetic flux was obtained from previous experimental result. Therefore, it was hopefully the prediction could be closed to the real system. Based on the simulation result, the shear yield stress varied from 43 to 49 Mpa or about 15 % increment. A simple experimental work was carried out. By applying particular direct current into the coil, the sound quality generated by the loudspeaker shows different values. Based on the preliminary experiment, the level of decibel decreased about 3 dB as the application of magnetic fields. The idea has been proven in this preliminary experimental evaluation.

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Effects of contact gap on nondestructive evaluation using magnetic measurement for ferromagnetic steel

International Journal of Applied Electromagnetics and Mechanics ◽

10.3233/jae-209411 ◽

2020 ◽

Vol 64 (1-4) ◽

pp. 969-975

Author(s):

Hiroaki Kikuchi ◽

Yuki Sato

Keyword(s):

Magnetic Flux ◽

Nondestructive Evaluation ◽

Effective Permeability ◽

Magnetic Circuit ◽

Magnetic Measurement ◽

Air Gap ◽

Motive Force ◽

Hysteresis Curve ◽

Evaluation Technique ◽

Ferromagnetic Steel

We investigated effects of contact gap on magnetic nondestructive evaluation technique using a magnetic single-yoke probe. Firstly, we evaluated hysteresis curves and impedance related to permeability of the material measured by a single-yoke probe, when an air gap length between the probe and specimens changes. The hysteresis curve gradually inclines to the axis of the magneto-motive force and magneto-motive force at which the magnetic flux is 0 decreases with increasing the gap length. The effective permeability also decreases with increasing the gap thickness. The incremental of gap thickness increases the reluctance inside the magnetic circuit composed of the yoke, specimen and gap, which results in the reduction of flux applying to specimen.

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Comparison of core loss and magnetic flux distribution in amorphous and silicon steel core transformers

Electrical Engineering ◽

10.1007/s00202-017-0574-7 ◽

2017 ◽

Vol 100 (2) ◽

pp. 1125-1131 ◽

Cited By ~ 2

Author(s):

Atabak Najafi ◽

Ires Iskender

Keyword(s):

Magnetic Flux ◽

Flux Distribution ◽

Core Loss ◽

Silicon Steel ◽

Steel Core

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Computationally Efficient Analysis of Spatial and Temporal Harmonics Content of the Magnetic Flux Distribution in a PMSM for Efficiency Maps Computation

2020 International Conference on Electrical Machines (ICEM) ◽

10.1109/icem49940.2020.9270900 ◽

2020 ◽

Author(s):

Carlos Candelo-Zuluaga ◽

Antonio Garcia Espinosa ◽

Jordi-Roger Riba ◽

Pere Tubert Blanch

Keyword(s):

Magnetic Flux ◽

Flux Distribution ◽

Computationally Efficient

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Magnetic Flux Analysis of E-Core Hybrid Excited FSM with Various Rotor-Pole Topologies

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.695.774 ◽

2014 ◽

Vol 695 ◽

pp. 774-777

Author(s):

Siti Nur Umira Zakaria ◽

Erwan Sulaiman

Keyword(s):

Magnetic Flux ◽

High Speed ◽

Flux Distribution ◽

Flux Analysis ◽

Flux Linkage ◽

Cogging Torque ◽

Excitation Coil ◽

Rotor Pole ◽

Field Excitation ◽

Flux Path

This paper presents magnetic flux analysis of E-Core Hybrid Excited FSM with various rotor pole topologies. The stator consists of three active fluxes sources namely armature coil, field excitation coil and permanent magnet, while the rotor consists of only stack of iron which is greatly reliable for high speed operation. Initially, coil arrangement tests are examined to validate the operating principle of the motor and to identify the zero rotor position. Then, performances of 6S-4P, 6S-5P, 6S-7P and 6S-8P E-Core HEFSMs such as flux path, flux linkage, cogging torque and flux distribution are observed. As conclusion, 6S-5P and 6S-7P designs have purely sinusoidal flux waveform and less cogging torque suitable for high torque and power motor.

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