What is the maximum admissible temperature?
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The standard Nanotec motors of the ST series have insulation class B = 130 °C. This temperature must not be exceeded in the windings and in the ball bearings. (In the SP series the temperature relates to insulation class E = 120°C and to plain bearings).
If you suspect the temperature is too high, it is recommended to measure the surface of the stepper motors with a suitable temperature sensor, possibly at different points depending on the cooling surface, in order to localize the exposed location. The surface of the stepper motor should never exceed 100 °C as otherwise irreversible damage can occur. How this temperature is reached, e.g. high ambient temperature and medium current or high current with low power-up time, is then irrelevant.
The temperature increase in nominal current operation in stepper motors is 80 °C, i.e. the max. admissible motor temperature of 130 °C is reached in the winding, in the bearing and in continuous running at an ambient temperature of 50 °C.
Better air convection is achieved (or even forced air circulation with a fan) with the aid of an additional larger flange area, preferably from aluminum (has a cooling ability 4 times better than steel), and hence motor cooling which enables a higher performance yield from the available size of motor
The lower the temperature of the motor, the longer the expected service life of the bearing.
