Page 227 - 2024-Vol20-Issue2

223 | Salman & Mohammed & Mohammed

various rotational speeds is influenced by the interaction be- Fig. 5. Braking power disc with rotational speed for several
tween the magnetic field induced by the permanent magnets types of PM materials
and the conductive materials in the brake disc. The actual
values for brake disc power depend on the magnets’ character- connector by a variable magnetic field. The strength of the
istics, the braking system design, and operational conditions. braking force is directly related to the magnetic flux density.
Neodymium Iron Boron (NdFeB) is the strongest magnetic Higher eddy currents result in stronger magnetic flux densities
material, producing high power at any speed. Due to its high and, therefore stronger braking forces.
magnetic characteristics, it induces greater eddy currents in
the conductive brake disc. Samarium Cobalt generates less Fig. 9 examines the term ”mesh,” which describes the in-
power than Neodymium Iron Boron but more than Ferrite (Ce- terplay between the magnetic field and conductor components
ramic) due to its slightly lower magnetic strength. Ceramic in a PMECB setup. The mesh arrangement plays a crucial role
magnets have a weaker magnetic strength when compared in the braking force, efficiency, and overall performance of a
to Neodymium Iron Boron and Samarium Cobalt because system. An adequately designed mesh ensures that force is
the magnetic field of this magnet interacts weakly with con- distributed evenly and energy is converted effectively, making
ductive brake discs, which generates less power. The study it a vital component in the optimization and design of the
shows a direct relationship between the magnetic properties PMECB system. There are 177393 elements and 36105 nodes
of PM materials and their power output in eddy current brake in the arrangement.
systems.
V. CONCLUSIONS
Fig. 7 illustrates how the efficiency of braking varies at
different rotational speeds for the three magnet materials. The The exciting advancement in braking technology known as
braking efficiency decreases as power losses increase due to the PMECB system combines the principles of eddy currents
the dissipation of input power within the braking system. As
power losses increase, less input power generates braking
force. Neodymium magnets display lower power loss at low
speeds due to their high coercivity and remanence. However,
the increase in rotational speed may cause moderate power
dissipation due to eddy current losses.

Higher electrical resistivity materials like samarium cobalt
may result in higher eddy current losses in the conductor. En-
ergy may be wasted as heat instead of being converted ade-
quately to braking force, resulting in reduced efficiency. High
temperatures can cause demagnetization or reduce braking
efficiency in magnets with temperature sensitivity.

Fig. 8 illustrates how permanent magnets and magnetic
flux density affect the eddy currents induced in the brake

Fig. 4. 3D CAD diagram of the PMECB components Fig. 6. Braking power disc with rotational speed for several
types of PM materials