Question: A three - phase, Y - connected, 2 2 0 - V ( line - to - line ) , 7 . 5 - kW

A three-phase, Y-connected, 220-V (line-to-line),7.5-kW,60-Hz,6-pole induction motor has the following parameter values in /phase referred to the stator: R1=0.294, R2=0.144, Rc =415, X1=0.503, X2=0.209, Xm =13.25 Two loads are available and can be modelled by the below equations: 1=60+0.3752=80+0.4872(1) Which load can be started by this motor? Justify your answer mathematically. (2) For the chosen load pf Part (1) calculate: a. The rotor slip and rotor speed b. The output torque and power c. The stator current (3) Calculate the value of resistance that can be inserted in series with the rotor that will be just sufficient to start the other load.

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