Answer / marques, joão

The heating time constant is the time required for a
electric motor to attain 63.2% of it's final temperature
for a fixed power input.

Answer / shyams

It is the time required for the electric motor to attain 63.2% of the maximum temperature reached by that electric motor

Answer / adeel

It is the time required for the homogeneous thermal model of an electric motor to attain 63.2% of the steady state temperature for a fixed input and fixed load torque.

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if the supply frequency increases what happens to the motor load

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