2. Converting electrical energy into mechanical energy
Among the electrical devices that convert electrical energy into mechanical energy, motors and loudspeakers consume the world's highest annual tonnages of permanent magnets. Among the most widespread electric motors, DC motors and synchronous motors use permanent magnets.
2.1 DC motors
These motors are powered by DC voltages. They have the advantage of being very easy to control at variable speeds, and are found in most servomotors used for low-power operation (less than 5 kW).
DC motors comprise an armature and a field. While the armature is generally made up of copper windings, the inductor can be made either with copper windings (Figure 5 ), or with permanent...
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Converting electrical energy into mechanical energy
Converting mechanical energy into electrical energy
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"Conversion of electrical energy"
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Economic data
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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