Question
If the motor in problem 15.13 operates at 1423 $\mathrm{rpm}$, find the values of $K_a \phi$ and $\tau_{d e v}$.
Step 1
We know that the motor operates at 1423 rpm. We need to find the values of \( K_a \phi \) and \( \tau_{dev} \). Show more…
Show all steps
Your feedback will help us improve your experience
Narayan Hari and 89 other educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
A shunt-connected de motor has $K \phi=$ 1 $\mathrm{V} /(\operatorname{rad} / \mathrm{s}), R_{A}=1.2 \Omega,$ and $V_{T}=200 \mathrm{V}$ Find the two speeds for which the developed power is 5 hp. Neglect field loss and rotational loss. Find the value of $l_{A}$ and efficiency for each speed. Which answer is most likely to be in the normal operating range of the machine?
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
A DC machine (6 kW, 120 V, 1200 rpm) has the following magnetization characteristics at 1200 rpm: IF (A) Ea (V) 0.1 5 0.2 20 0.3 40 0.4 60 0.5 79 0.6 93 0.8 102 1.0 114 1.2 120 1.4 125 The machine parameters are Ra = 0.2 Ω, Rfw = 100 Ω. The machine is driven at 1200 rpm and is separately excited. The field current is adjusted at If = 0.8 A. A load resistance RL = 2 Ω is connected to the armature terminals. Neglect armature reaction effect. Determine the quantity KaΦ for the machine. Determine Ea and Ia. (c) Determine torque T and load power PL.
Transcript
Watch the video solution with this free unlock.
EMAIL
PASSWORD