DC Machines: Laminated Rotor Core Benefits

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avro1on1
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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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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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