The windings has two functions:
a. Generation of a magnetic field.
b. Generation of a force or torque in a magnetic field.
Windings are placed on both the stator and the rotor. Mostly the windings are made of copper; in some exceptional cases the are made of aluminum or silver.
The field windings are thin and have a relatively low current value. The force generating windings are
thick and have a high current value. The magnet field windings can be replaced by permanent
magnets.
Permanent magnets have a strong magnetic field in relation with its volume, that is why small motors
have most of the time a permanent magnet. The current in the windings caused conducting losses.
These losses heats the actuator, with is very disadvantageous. The windings are positioned in such a
way that they get rid of their heat very easy.
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