Why is the stator core of the DC motor made of a whole piece of steel, while the rotor core is stacked with silicon steel sheets?
The magnetic field (main magnetic field) in the stator core is a DC magnetic field with constant size and direction. The flux in the iron core is constant, and the induced electromotive force and eddy current are not produced. The whole steel is made from the aspects of process convenience and magnetic conductivity.
Although the main magnetic field size and direction are constant, but the rotor is rotating, the local iron core of the rotor is rotating at different positions of the magnetic field, its flux is alternating, will produce induction electromotive force and eddy current, in order to reduce the eddy current, the rotor core must be laminated with silicon steel sheet.
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