HW6 EE 448 - Introduction to AC Circuits and Motors Problem 1: A 3-phase induction motor with 4 poles is connected to a

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Hw6 Ee 448 Introduction To Ac Circuits And Motors Problem 1 A 3 Phase Induction Motor With 4 Poles Is Connected To A 1 (42.98 KiB) Viewed 22 times

HW6 EE 448 - Introduction to AC Circuits and Motors Problem 1: A 3-phase induction motor with 4 poles is connected to a voltage source with v, (t) = 200 cos (120zt) V The motor has negligible rotational losses. The motor has R₁ = 6.25 92, R=0.5 2, X,10 2, X=1 2, and X=40 2. In addition, the motor is spinning at a speed of 1200 rpm. What is the output torque at the specified speed using the derived slip/torque equation for the motor? (10 points) Problem 2: A 3-phase induction motor with 10 poles is connected to a voltage source with v, (t) = 200 cos (250z) The motor has R, =4 , R=1.5 92, X, = 15 , X = 122, and X = 50 Ω. a) Sketch the speed torque curve for this motor. The curve only needs to be approximate, however, you should give the value on the curve for the starting torque, maximum torque, speed at maximum torque in rpm, and maximum speed of the motor in rpm. (20 points) b) What are all of the possible motor speeds in rpm and slips if the developed torque, Tdev, is 10 Nm? (15 points)