SELECTION OF MOTORS FOR DIFFERENT DUTY CYCLES : 1. Continuous duty cycle : It denotes the motor operation at a constant load torque to reach steady state temperature. The load time and. temperature time graph are shown in fig 1.1 EXAMPLES : Paper mill drives compressors, conveyers, centrifugal pumps and fans fig. 1.1 2. Short time duty : It denotes the operation of motor at constant load for short period followed by rest to cool down to the original starting temperature. Short time duty timings are generally 10, 30, 60 and 90 minutes. The load time and the temperature time graph are shown in fig 1.2 EXAMPLES : Crane drivers, drives for household appliances, sluice gate drives, valve drives and machine tool drives fig 1.2 4. Intermittent period duty with starting :
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