A 3 phase induction motor is said to be running at its rated

A 3 phase induction motor is said to be running at its rated value. If the mechanical torque on the rotor is decreased, how would the following quantities change?

a) nr

b) no

c) slip

d) rotor currents (magnitude)

e) frequency of rotor currents

f) Pcu2

Solution

a)nr decreases

b)increases upto max torque and then decresed

c)slip decreases

d)rotor current increases

e)frequencys increses upto max torque reached after that frequency decreases

f) Pcu2 increases