Find the values of ?m at which the machine can develop

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Reference no: EM131115264

A two-pole rotating machine with a singly excited magnetic field system as its stator and a rotor (that carries no coil) has a stator-coil inductance that can be approximated by L(θ ) = (0.02 - 0.04 cos 2θ - 0.03 cos 4θ ) H, where θ is the angle between the stator-pole axis and the rotor axis. A current of 5 A (rms) at 60 Hz is passed through the coil, and the rotor is driven at a speed, which can be controlled, ofωm rad/s. See Figure P12.4.8 for the machine configuration.

(a) Find the values of ω_m at which the machine can develop average torque.

(b) At each of the speeds obtained in part (a), determine the maximum value of the average torque an d the maximum mechanical power output.

Reference no: EM131115264

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