5. Converting mechanical energy into thermal energy
The conversion of mechanical energy into thermal energy using induced currents has become widespread with the introduction of induction ovens and hobs. However, many other applications, often less well known to the general public, use these same currents, which sometimes generate unwanted heating.
Consider the diagram in figure 24 , where the driven part no longer consists of a magnet as in figure 22 a, but of a non-magnetic circular disk D, a good electrical conductor (often made of copper), attached to...
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Converting mechanical energy into thermal energy
Devices generating a fixed or variable magnetic field
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1. Worldwide production
The permanent magnet market was estimated at US$4.4 billion in 1998, over US$5 billion in 2000 and US$8 billion in 2007. It should continue to grow, reaching US$11 billion in 2010.
With their modest magnetic performance but low cost, ferrites remain the magnet family that dominates the world market, both in terms of tonnage (90%) and sales (around half of the global...
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