Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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Chapter 21, Problem 10SQ
In place of the push buttons in Figure 21–4, draw a heavy-duty selector switch for forward-reverse-stop control. Show the target table for this selector switch.
FIG. 21–4
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Use PSpice to model the differential amplifier circuit shown in Fig. 4 in DIBO mode (double input balanced output). Use 2N3904 BJTs and use appropriate values for resistors (you can choose the values that will not lead to excessive gain and saturation) to demonstrate that the circuit provides differential amplification. Use Vcc = 5 and Vee = 5. Use a pair of sinusoids with opposing polarity (180 degree phase shift) as the inputs to the differential amplifier. Recall from the theory ic is needed to compute re. Make sure that the conditions set in the analysis of DIBO circuit are satisfied. Assume Rs1 = Rs2 50 Ω. Does your simulation match the theoretical gain? Explain any differences.
Derive the expression for the voltage gain of DIBO differential amplifier using AC analysis.
Consider the following circuit.
+
- 1.2 ΚΩ
ig (1) vo
ΣΕ ΚΩ
€ 50 nF
200 mH
a) [6 pts] The frequency of the source current in the circuit is adjusted until vo is in phase with ig. What is
the value of o in radians per second? (Hint: if vo is in phase with ig, the phase of total impedance must be
zero (Ztot = vol ig), which means the phase of total admittance is zero. It will be easy to work with
admittance in this question because the components are in parallel.)
b) [2 pts] What is the total impedance at the frequency found in (a)?
c) [2 pts] Ifig=2.5 cosoot mA (where o is the frequency found in [a]), what is the steady-state expression
for vo?
Chapter 21 Solutions
Electric Motor Control
Ch. 21 - How is a change in the direction of rotation of a...Ch. 21 - Prob. 2SQCh. 21 - If a reversing control circuit contains...Ch. 21 - How is auxiliary contact interlocking achieved on...Ch. 21 - After the forward coil has been energized, is the...Ch. 21 - If a mechanical interlock is the only means of...Ch. 21 - If pilot lights are to indicate which coil is...Ch. 21 - What is the sequence of the operations if the...Ch. 21 - In place of the push buttons in Figure 214, draw a...Ch. 21 - From the elementary drawing in Figure 2110,...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Consider the following circuit with ig (t) = 200 cos(5000t) mA. 240 ΩΣ + 80 2: 2.5 µF 48 mH a) [3 pts] Obtain and draw the frequency-domain circuit. b) [3 pts] Use the current division to find the current flowing through the 240 2 resistor. c) [3 pts] Then calculate Vo in phasor form. d) [1 pts] Write the steady-state expression for vo(t).arrow_forwardQ-Draw a sample and hold electronic circuit using op-amp then explain its operation. I hope the solution is from a human being and not from intelligencearrow_forwardDesign an AC-coupled (input and output) amplifier with a gain of -8 which has identical 3 dB corner frequencies of 10 kHz for high pass coupling at the input and output. Assume a power supply of 5 volts.arrow_forward
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