AC MACHINES-1 (66761) Theory
Completion requirements
11. Recognize the concept of development of rotating magnetic field and torque in rotor.
11.10. Explain the effect of changing the voltage on torque and speed.
Effect of Change in Supply Voltage on Torque and Speed
Obviously, torque at any speed is proportional to the square of the applied voltage. If stator voltage decreases by 10%, the torque decreases by 20%. Changes in supply voltage not only affect the starting torque Tst but torque under running conditionsEffect of Change in Supply Voltage on Torque and Speed
Obviously, torque at any speed is proportional to the square of the applied voltage. If stator voltage decreases by 10%, the torque decreases by 20%. Changes in supply voltage not only affect the starting torque Tst but torque under running conditions also. If V decreases, then T also decreases.
Hence, for maintaining the same torque, slip increases i.e. speed falls.
