3-dimensional electromagnetic analysis and design of an eddy-current rail brake system

Analytical model and finite element computation of braking torque in electromagnetic retarder

“…However, the accuracy of the 2-D analysis is not good, which cannot account for the end effects and circumferential eddy currents directly. 3-D transient analysis is better suited for electromagnetic retarders in particular and eddy current problems generally [14][15][16][17][18][19]. However, it requires a powerful processor and a large memory, and takes much longer time than 2-D analysis to reach a solution.…”

Analysis for Ring Arranged Axial Field Halbach Permanent Magnets

“…In a glued Halbach magnetized magnet, the remanent intrinsic magnetization varies discontinuously between two adjacent blocks, where is the remanence of the magnet. Here, is given in an ideal form to yield the analytical solution (4) where (5) The magnetic field produced by a Halbach magnetic in the experimental system can be described by the scalar potential in the vacuum (6) in the PM (7) where and , are related to H by…”

“…Nowadays the Halbach PMs have been adopted in many electromagnetic engineering domains such as electrical motors, Maglev, and eddy current brakes [4]- [6]. Conventionally, the segments of Halbach PMs are arranged on a straight line or in a ring, and the flux of ring type Halbach is magnetized in radial direction.…”

Analysis and Case Study of Permanent Magnet Arrays for Eddy Current Brake Systems with a New Performance Index

“…The eddy current due to motion is given by, (4) where σ is the conductivity of moving secondary side. Using (3) and (4), (1) can be written as, (5) where and A is the magnetic vector potential. Assuming the motion is only in the x-direction and the eddy current only has z-component, the v × term in (5) becomes, .…”

“…However, there are disadvantages, such as the strong heat and thermal metamorphism due to the generation of the induced currents, and very weak braking force at low speeds. Nevertheless, because of the advantages of noncontact brake that are effective at high speeds with short response times, it is widely used in many controlled braking applications [1][2][3].…”