4.2 A motor operates on a periodic duty cycle consisting of a loaded period of 20...

 

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4.2 A motor operates on a periodic duty cycle consisting of a loaded period of 20 min and a no load period of 10 min. The maximum temperature rise is 60°C. Heating and cooling time constants are 50 and 70 min respectively. When operating continuously on no load the temperature rise is 10°C. Determine (a) Minimum temperature during the duty cycle. (b) Temperature when the motor is loaded continuously. 4.3 The temperature rise of a motor when operating for 25 min on full load is 25°C and becomes 40°C when the motor operates for another 25 min on the same load. Determine heating time constant and the steady state temperature rise. 4.2 A motor operates on a periodic duty cycle consisting of a loaded period of 20 min and a no load period of 10 min. The maximum temperature rise is 60°C. Heating and cooling time constants are 50 and 70 min respectively. When operating continuously on no load the temperature rise is 10°C. Determine (a) Minimum temperature during the duty cycle. (b) Temperature when the motor is loaded continuously. 4.3 The temperature rise of a motor when operating for 25 min on full load is 25°C and becomes 40°C when the motor operates for another 25 min on the same load. Determine heating time constant and the steady state temperature rise.

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