Why is the DC motor armature recruited from thin steel plates isolated from each other, and not cast in the form

Why is the DC motor armature recruited from thin steel plates isolated from each other, and not cast in the form of a solid bar, which would be easier?

Induction currents arising in the armature core heat it up a lot. Therefore, it is made from platinum. In this case, the magnitude of the induction currents becomes smaller.

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