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Definition: Thermal Considerations


Thermal considerations are involved in a large percentage of motor application decisions. The main adverse effect of overheated motors is the breakdown of insulation caused by excessive temperatures. Eventually, poor insulation leads to electrical shorts in the windings, necessitating a rewind of the motor. Under rare conditions, overheated motors can also cause fires. Many motors today, particularly the more expensive motors, are built with temperature sensors which allow monitoring of winding temperatures and allow for automatic shutdown if desired.

Thermal considerations during application of the motors depend largely on the enclosures involved.

Specialty motors, particularly servo motors and stepper motors, have additional thermal considerations involved. These motors have dual ratings: