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While reading a book on electrical machines, I found a point that says that for power generation, a stationary armature is the preferred type. If in any generator, there must be moving parts, why is the choice of stationary armature preferred.

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    \$\begingroup\$ Avoids brushes, slip-rings, or similar sliding contacts carrying current. \$\endgroup\$ – user_1818839 Jun 21 '20 at 21:42
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Because large currents need sizable conductors and brushes wear.

So fixed connections are easier and only a permanent magnet or a small excitation current needs to be rotated.

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