Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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Chapter 48, Problem 5SQ
To determine
Explain the effect if the contacts of zero-speed switch are adjusted to open very late.
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1) The parameters for circuit in Figure 1 are ẞ₁ = 120, B2=80, VBE1 (On) = VBE2 (on) =
0.7 V and VA1 = VA2 = ∞0.
a) Find the collector current in each transistor.
b) Find the small signal voltage gain Av = Vo/Vs.
c) Find the I/O resistance.
Rib
5V.
Figure 1
Q₁
0.5 k
Vcc=9V
Q2
R
ww
50 Ω
3) In the circuit in Figure 3, the Transistor parameters are VTN = 0.8 V and Kn
= 0.5 mA/V2. Calculate ID, VGS, and VDS.
VDD = 10 V
Κ = 32 ΚΩ
Κρ=4ΚΩ
R2 = 18 ΚΩ
Rs = 2k
Figure 3
2) Consider the circuit in Figure 2, The transistor parameters are VTP = -0.8 V and Kp
= 0.5 mA/V2. Determine ID, VSG and VSD.
Chapter 48 Solutions
Electric Motor Control
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- For the circuit shown, let V₁ = 12 V, Is1 = 2A, Is2 = 4A, R₁ = 2, R2 = 4, and R3 = 6. Determine the current Io using Mesh method as follows: 1. Choose all meshes that must be included, if any, to construct the supermesh. 11, 13 O 11, 12 O 12, 13, 11 12, 13 O none of the above 2. Consider mesh (loop) iz, write the corresponding expression in terms of mesh currents i₁, 12, 13 as of the form (R11 · i₁ + R₁2 · 2 + R₁3-13 = V₁), then enter the corresponding values: R11 R12 R13 Ω Ω Ω V V₁₂ 3. Solve the above equation to determine then lo : 10 = Ist A R₁ ww ww R₂ + V₁ 1, R3 The relative tolerance for this problem is 7%. ww IS2arrow_forwardEnter the matrix values (numerical) to solve for mesh-currents i₁, iz and 13, for the circuit shown, using Mesh method. In the matrix, row 1, row 2, and row 3 correspond to i₁, 12 and 13, current expressions, respectively. Let Vs=15, R₁ =50, R₂-32, R3-8, R4-17, R5-29, and R=41. [R11 R12 R13 The matrix values are shown here: R21 R22 R23 = V₂ R31 R32 R33 [V3] The relative tolerance for this problem is 5%. R1 Loop i₁ R11 + Vs Ω R12 Ω R13 Ω V V₁= Loop 12 R21 Ω R22 Ω R23 Ω V V₂ Loop 13 Ω R31 R32 Ω R33 Ω V3= V R2 R4 R3 R5 R6arrow_forwardFor circuit shown, use Mesh method to find the voltage Vo as follows. Enter, in the matrix format, as below, the loop currents, where row 1, and row 2, correspond to i₁, and i2 loop current expressions, respectively. Let Vs1-5, Vs2-15, R₁=5, R₂=2, and R3=8. The matrix values are shown here: [R11 R12 21 R21 R22 Rx - M - M iz = The relative tolerance for this problem is 5%. Vst (+- R1 ww Loop i₁ R115 G12 V₁ = Loop 12 R21 R22 V₂= Ω C C Ω V Ω 02 C V R₂ ww VS2 + Ry ww + Vo Use Cramer's rule (matrix), substitution, or any other method to calculate the voltages:arrow_forward
- = = For the circuit shown, let V, 15 V, I, 4A, R₁ =5, R₂ 10, R3 10, and R4 5. Determine the output voltage Vo as follows All resistor values are in ohms. 1. Identify the supermesh and write its corresponding Mesh equation. Provide your expression in terms of the shown mesh current i₁, and 12 of the form (R11 · 11+ R12 · 12 = V₁), then enter the corresponding values: R11 Ω R12 V₁= V Ω 2. Use the above equation, and supermesh inner expression to calculate i₂: i₂- Find Vo V₁ = A V R₁ www M R3 ww V R4 V₁ 0 IS R₁ The relative tolerance for this problem is 7 %. 0arrow_forward11.18 In the circuit of Fig. P11.18, what should the value of thecoupling coefficient k be so that Vout/Vin = 0.49?arrow_forward11.26 Determine the complex power supplied by the source inthe circuit of Fig. P11.26.arrow_forward
- 11.23 Determine Vout in the circuit of Fig. P11.23arrow_forwardReversing 1⏀ Motors-all the wires are not used. Use the data sheet b on page 383 to draw the wiring diagram. Note: interchange the red and black leads to reverse the motor rotation. Use only the number of contacts required. Insulate any motor wire not used with a wire nut. Wire the motor to operate in forward and reverse at 115 VACarrow_forwardSee both images to answerarrow_forward
- See both images to answerarrow_forwardAn inner-city electric bus with 7,200kg weight and average speed of 72 km/hour operates using a hybrid power source of lithium-ion battery pack and a bank of super capacitor. equipped with a lithium battery pack and a bank of supercapacitor. The energy content of the supercapacitor bank is twice the regenerative breaking energy of the electric bus at average speed. The electric bus commutes 490 km per charged battery and consumes 400 Wh/km. Design the supercapacitor bank to provide 100V output, based on supercapacitor cells with 3600F capacitance and 2V. Calculate the energy density of the supercapacitor at the cell level, assume cells with 10cm diameter and 15 cm height. 3. Design the battery pack for the electric bus by assuming that the energy of regenerative breaking will not be used for commuting but used to run the vehicle’s accessories. The unit cell of the battery pack is a lithium-ion…arrow_forwardA rod coincident with the z-axis extends from 0 to -L. If the rod carries a uniform charge density of pL (a) calculate the electric field intensity at a point h on the z-axis. (b) Use your answer to show that when h>>L the rod behaves as a point charge of value plL . (c) How much larger than the length of the rod must h be in order that the answer to part b) is a reasonably accurate estimate.arrow_forward
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