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How are the radial loads caused?

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in Design of Electrical Machines by (687k points)
How are the radial loads caused?

(a) dynamic unbalance of rotor

(b) unbalanced magnetic pull of rotor

(c) dynamic unbalance of rotor or unbalanced magnetic pull of rotor

(d) dynamic unbalance of rotor and unbalanced magnetic pull of rotor

The question was asked in my homework.

This intriguing question originated from Bearings in division Aspects of Design of Mechanical Parts of Design of Electrical Machines

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Right choice is (c) dynamic unbalance of rotor or unbalanced magnetic pull of rotor

To elaborate: The radial loads are caused by the dynamic unbalance of rotor. It can also be caused by the unbalanced magnetic pull of rotor.

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