Question
For the machine in problem 16.25 , if the threephase real power output does not change, find the new rotor angle if the field current is adjusted to produce an $E_f=4000 \mathrm{~V}$ while the terminal voltage is held constant.
Step 1
We know that the field current is adjusted to produce an electromotive force (E_f) of 4000 V, and the terminal voltage (V_t) is held constant. We also need to recall the three-phase real power output, which remains unchanged. Show more…
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Suppose that a shunt-connected machine operates at 800 rpm on the linear portion of its magnetization characteristic. The motor drives a load that requires constant torque. Assume that $R_{A}=0 .$ The resistances in the field circuit are $R_{F}=50 \Omega$ and $R_{\mathrm{adj}}=$ $25 \Omega$. Find a new value for $R_{\text {adj }}$ so that the speed becomes 1200 rpm. What is the slow. cst speed that can be achicved by varying $R_{\text {ad }} ?$
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