Study on Faraday's Law for the Non-uniform Magnetic Field Produced by a Permanent Magnet

To provide appropriately high and uniform magnetic field for micro electroforming process, a permanent magnet generator was specially developed which based on the fundamental process requirements. On the basis of determining the number of permanent magnet combinations numerically. Mainly, the geometrical shape of the permanent magnet blocks and magnetic circuit structure were optimized, and then the working gap regulating mechanism for this generator was designed. Utilizations indicated that the developed generator met the requirements well.

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Electromagnetic induction noise in a towed electromagnetic streamer

Geophysics ◽

10.1190/geo2014-0597.1 ◽

2016 ◽

Vol 81 (3) ◽

pp. E187-E199 ◽

Cited By ~ 3

Author(s):

Axel Tcheheumeni Djanni ◽

Anton Ziolkowski ◽

David Wright

Keyword(s):

Magnetic Field ◽

Noise Level ◽

Electromagnetic Induction ◽

Uniform Magnetic Field ◽

Wave Motion ◽

Current Flow ◽

Constant Current ◽

Simple Analysis ◽

Faraday’S Law ◽

Neutrally Buoyant

We have examined the idea that a towed neutrally buoyant electromagnetic (EM) streamer suffers from noise induced according to Faraday’s law of induction. A simple analysis of a horizontal streamer in a constant uniform magnetic field determined that there was no induction noise. We have developed an experiment to measure the induced noise in a prototype EM streamer suspended in the Edinburgh FloWave tank, and we subjected it to water flow along its length and to waves propagating in the same direction, at 45° and 90° to the streamer direction. The noise level was found to increase with increasing flow velocity. The motion of the prototype EM streamer in response to parallel constant current flow and wave motion was found to generate significant noise. The main finding is that wave motion was the major source of noise and was much larger than the noise of a static cable. The noise level can probably be reduced by towing the cable deeper and increasing the cable tension.

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Non-uniform magnetic field impact on thermomagnetic convection of paramagnetic air in a permanent magnet-inserted horizontal annulus

The European Physical Journal Plus ◽

10.1140/epjp/s13360-021-01136-1 ◽

2021 ◽

Vol 136 (2) ◽

Author(s):

Er Shi ◽

KangKang Li ◽

Changwei Jiang ◽

Yecong He ◽

Mousa Mohammadpourfard

Keyword(s):

Magnetic Field ◽

Permanent Magnet ◽

Uniform Magnetic Field ◽

Thermomagnetic Convection

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Review for "Numerical study of ferro‐droplet breakup initiation induced by a slowly rotating uniform magnetic field"

10.1002/eng2.12316/v1/review2 ◽

2020 ◽

Keyword(s):

Magnetic Field ◽

Uniform Magnetic Field ◽

Numerical Study ◽

Droplet Breakup

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Decision letter for "Numerical study of ferro‐droplet breakup initiation induced by a slowly rotating uniform magnetic field"

10.1002/eng2.12316/v3/decision1 ◽

2020 ◽

Keyword(s):

Magnetic Field ◽

Uniform Magnetic Field ◽

Numerical Study ◽

Droplet Breakup

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A novel analytical calculation of magnetic field in the slotted air gap of spoke-type permanent-magnet machines using conformal mapping

International Journal of Applied Electromagnetics and Mechanics ◽

10.3233/jae-201505 ◽

2020 ◽

pp. 1-15

Author(s):

Jianqi Li ◽

Yu Zhou ◽

Jianying Li

Keyword(s):

Magnetic Field ◽

Conformal Mapping ◽

Permanent Magnet ◽

Flux Density ◽

Analytical Method ◽

Electromotive Force ◽

Analytical Calculation ◽

Air Gap ◽

Permanent Magnet Machines ◽

Peak Value

This paper presented a novel analytical method for calculating magnetic field in the slotted air gap of spoke-type permanent-magnet machines using conformal mapping. Firstly, flux density without slots and complex relative air-gap permeance of slotted air gap are derived from conformal transformation separately. Secondly, they are combined in order to obtain normalized flux density taking account into the slots effect. The finite element (FE) results confirmed the validity of the analytical method for predicting magnetic field and back electromotive force (BEMF) in the slotted air gap of spoke-type permanent-magnet machines. In comparison with FE result, the analytical solution yields higher peak value of cogging torque.

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