For stepper motor specification, the normal working temperature range is -20-50℃, and the humidity is 20%-90%RH.

Temperature requirements:
Generally, stepper motors are equipped with Class B insulation, which means the internal temperature should not exceed 130 degrees Celsius. Considering that the normal room temperature is within 40℃，the surface temperature is kept below 90 degrees.  
If the motor's working temperature is too high, it is necessary to reduce the temperature rise by reducing the motor's working current, or strengthening heat dissipation.

Humidity requirements:
The stepper motor should meet the humidity requirements, which is mainly to avoid condensation inside the motor. If the humidity is too high, it may cause rotor rust and motor jamming.

Dustproof requirements:
Dustproof is mainly used in places such as conductive and bearing parts to prevent them from being invaded by dust. Most of them use rubber or resin to protect the coil part, lead wire part, bearing part, etc.

If you have more requirements for the stepper motors' temperature, humidity, and dustproof performance, please contact us for customization.