Former EASA Technical Support Specialist
Most motors are run continuously with little variation in load. A continuous duty motor is energized and loaded for an extended period of time. When the motor is started, the temperature increases, and then the temperature stabilizes after some time.
If the motor was designed with a service factor, it is possible to run the motor at a higher-than-rated load for short periods of time without significant thermal damage to the windings, rotor or bearings. A motor to be used with a continuous load is sized based on that load rating.
There are, however, many applications where a motor is not loaded consistently throughout its duty cycle, or is energized intermittently.
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