A420 vll, 60 hz, 3-phase, y-connected, 4 pole induction motor is running at rated voltage and current. the rotor speed is 1720 rpm. the stator resistance and leakage reactance may be neglected. when the motor runs at no load, the speed is approximately 1800 rpm and the stator line current (magnitude) is 5 amps. the rotor resistance referred to the stator (rr) is 0.8 ohms. the rotor leakage reactance referred to the stator (xir) is 2.0 ohms.
(a) what is the frequency of the rotor current at this operating point (1720 rpm)?
(b) what is the rated line current magnitude?
(c) what is the starting line current magnitude if started at full rated voltage?
(d) what is the rated torque?
(e) what is the maximum possible torque this motor can deliver?
(f) what is the rotor speed (in rpm) at which this maximum torque occurs?

5submission this assignment is worth 20 points total. you are required to submit the following by next lab: 1. (3 points) determine the equation for the output angular velocity ω2 = θ˙ 2 as a function of θ1, ω1 = θ˙ 1 and α. you must show all your work to receive credit. 2. (2 points) use the result of problem#1 to plot ω2 over 0 ≤ θ1 ≤ 360deg with ω1 = 360deg/sec. do this for α = {10,30}deg. show the results on the same plot and properly label the axes, title, legend. for this you can use matlab or ms excel. 3. (3 points) determine the equation for the output angular acceleration ω˙ 2 and create a plot similar to the one in problem#2. 4. (10 points) submit plots of the results (ω2 and ω˙ 2) obtained from creo/mechanism and compare them to results of problem#2 and problem#3. note that you should do these comparisons for the two cases with α = {10,30}deg. 5. (2 points) provide a brief explanation of the results. did they match? what are the implications as misalignment angle increases?

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