2. Conversion of Electrical Energy into Mechanical Energy
Among electrical devices that convert electrical energy into mechanical energy, motors, actuators, and speakers account for the largest annual global consumption of permanent magnets. Among the most common types of electric motors, DC motors and synchronous motors use permanent magnets.
These motors are powered by direct current. They offer the advantage of being very easy to control at variable speeds and are found in most servomotors used for low-power applications (less than 5 kW). DC motors consist of an armature and a stator. While the armature is generally made of copper windings, the stator can be constructed either with copper windings (Figure
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Conversion of Electrical Energy into Mechanical Energy