DC Machines: Laminated Rotor Core Benefits

Thread starter avro1on1
Start date Nov 13, 2009
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Dc Machines

AI Thread Summary

Laminated rotor cores are used in DC machines primarily to reduce eddy current losses, even though the rotor carries direct current. When a commutator is present, the currents in the rotor windings are not purely DC, necessitating the use of laminated cores to minimize losses. In contrast, rotors with slip rings experience currents that are nearly DC, which reduces the need for lamination. The discussion highlights the importance of rotor design in optimizing efficiency and performance in DC machines. Understanding these factors is crucial for effective machine design and operation.

Nov 13, 2009

avro1on1

why are laminated rotor cores used in dc machines (with dc current in the rotor) when there is no possibility of eddy current (or is there?).

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Nov 13, 2009

Bob S

If the rotor has a commutator, the currents in the rotor windings are not dc, and the core must be laminated. If the rotor has slip rings, the currents are almost dc.
Bob S

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