Question
Neglecting the rotational losses find the no-load speed, line current, and power factor for the motor of Problem $\mathrm{P} 17.22$.
Step 1
The no-load speed is given by the formula $N_0 = \frac{120f}{P}$, where $f$ is the frequency and $P$ is the number of poles. Substituting the given values, we get \[N_0 = \frac{120 \times 60}{4} = 1800 \, \text{rpm}\] Show more…
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Neglecting the rotational losses, find the no-load speed, line current, and power factor for the motor of Problem P17.25.
A separately excited de motor (see the equivalent circuit shown in Figure 16.21 on page 788 ) has $R_{A}=1.3 \Omega$ and $V_{T}=220 \mathrm{V}$ For an output power of 3 hp $, n_{m}=950 \mathrm{rpm}$ and $I_{A}=12.2 \mathrm{A}$. The field current remains constant for all parts of this problem. a. Find the developed power, developed torque, power lost in $R_{A}$, and the rotational losses b. Assuming that the rotational power loss is proportional to speed, find the no-load speed of the motor
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