1. Presentation
1.1 Permanent magnets
In an electric machine, there are two types of excitation source:
a winding supplied with alternating current (asynchronous machine) or direct current (synchronous or direct current machine);
permanent magnets.
It's worth noting that for the winding, the production of the magnetic field is conditioned by the existence of an additional power source, which implies losses in the copper, which also heats the active part...
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