* 4 poles => 2 pairs
Speed of rotor Nr = 1400 rpm
Synchronous speed Ns = (50 Hz / 2 pairs) = 25 = 1500 rpm
slip = (Ns - Nr)/Ns = (1500 - 1400)/1500 = 0.067
Rotor Current Frequency = Per unit slip × Supply frequency When the rotor is stationary
Rotor Current Frequency = 0.067 x 1500 = 3.33...
Problem:
The propulsion system of a train consists of inverter-fed three-phase induction traction motor. At base speed, the train has the speed 100 km/h. The maximum torque is (1.5Tn) where Tn is the rated torque and the breakdown torque is (1.875 Tn).
The maximum speed of the train is...
Hey all!
Problem:
an induction motor is fed from a three-phase voltage source inverter connected to a DC voltage of 1500 V. Determine the RMS value (not the fundamental) of the motor voltage at 1.5 times base speed (base speed = 100 km/h)?
any ideas on how to approach this problem!
