Stepper motor appearance temperature allowed?

Stepper motor temperature will make the first motor demagnetization of magnetic materials, which can lead to torque decline and even out of step, so the motor appearance allows the highest temperature should depend on different points of demagnetization magnetic material; Stepper motor appearance temperature allowed? Demagnetization of magnetic materials, in general, some are above 130 degrees Celsius, some even as high as 200 degrees Celsius above, so the temperature in Celsius 80 - step motor appearance90 degree completely normal.
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