An AC induction machine has six poles and is designed for 60-Hz, 240-V (rms) operation. When the machine operates with 10 percent slip, it produces 60 N-m of torque.
a. The machine is now used in conjunction with a friction load that opposes a torque of 50 N-m. Determine the speed and slip of the machine when used with the above-mentioned load.
b. If the machine has an efficiency of 92 percent, what minimum rms current is required for operation with the load of part a?
(Hint: You may assume that the speed–torque curve is approximately linear in the region of interest.)
Analysis:
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