21. A six-pulse SCR bridge for a three-phase source draws power from a 500 V, 50 Hz line (the volt-age is specified as the RMS line-to-line potential, as is standard in three-phase practice). The rec-tifier supplies a large dc motor. The motor has series inductance La = 0.4 mH and series resis-tance R₁ = 5 ms. The internal voltage Vg = kw, where k is a field flux constant equal to 3 V. s/rad,and w is the shaft speed in rad/s. The shaft torque is Tekia, where ia is the motor current. It isdesired to operate this motor with a 250 A current limit to provide a controlled acceleration atstart-up. Determine the SCR phase delay angle as a function of motor speed to enforce a 250 Acurrent.

Answered: Image /qna-images/answer/86e81c52-18af-4a9c-81e3-4f2979d344bf.jpg

A six-pulse SCR bridge for a three-phase source draws power from a 500 V, 50 Hz line (the volt- age is specified as the RMS line-to-line potential, as is standard in three-phase practice). The rec- tifier supplies a large dc motor. The motor has series inductance La = 0.4 mH and series resis- tance R = 5 mn. The internal voltage V₂ = kw, where k is a field flux constant equal to 3 V s/rad, and w is the shaft speed in rad/s. The shaft torque is T₂ = kia, where ia is the motor current. It is desired to operate this motor with a 250 A current limit to provide a controlled acceleration at start-up. Determine the SCR phase delay angle as a function of motor speed to enforce a 250 A current.

A six-pulse SCR bridge for a three-phase source draws power from a 500 V, 50 Hz line (the volt- age is specified as the RMS line-to-line potential, as is standard in three-phase practice). The rec- tifier supplies a large dc motor. The motor has series inductance La = 0.4 mH and series resis- tance R = 5 mn. The internal voltage V₂ = kw, where k is a field flux constant equal to 3 V s/rad, and w is the shaft speed in rad/s. The shaft torque is T₂ = kia, where ia is the motor current. It is desired to operate this motor with a 250 A current limit to provide a controlled acceleration at start-up. Determine the SCR phase delay angle as a function of motor speed to enforce a 250 A current.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter21: Resistive-capacitive Series Circuits

Section: Chapter Questions

Problem 7RQ: An RC series circuit is connected to a 120-V, 60-Hz power source. The resistor is 25 and has a...

See similar textbooks

Similar questions

Calculate the rms value of the output voltage of an AC-AC converter with the following specifications. Vs—110*sqrt(2)*sin(wt), Alpha Pi/6
Write the general voltage equation for a 250-Hz source whose peak voltage is 300 V.
For the following parts, identify the name of each circuit, plot the output waveform, and find the DC output average voltage. Part (a) V 1 cycle V₁ = V sin cor Part (b) PE Part (c) Vm Vi ele eeeeeeeeeeeeee D D₂ D₁ D₂ R Va + D₂ D₁
In the given circuit, a step down transformer with an RMS voltage as 110V /11-0-11 V is used with RL = 1 KO. Assume diode as Germanium and the input frequency is F= 50HZ. D, CT Vin RL D2 1- Name the given circuit. 2- Find The PIV. 3- Find Current trough load resistance. 4- Draw the Input and Output wave forms. all
Determine the rms current in the figure for Vrms = 16 V and C = 74µF V f=10 kHz
The sinusoidal voltage trace displayed by the CRO, the time/cm switch is on 50 µs/cm and the volt/cm switch is on 20 V/cm. The width of one complete cycle is 3.6 cm and the peak to peak height is 5.8 cm. Determine the following: The frequency is = The peak to peak voltage is = The amplitude is = The R.M.S voltage is =
A pure sinusoidal current is being rectified. For the given maximum value of half wave rectified current is 50 A, then the rms value of full wave rectification will be 50 (a) A (b) 100 - A TC (c) 100 A (d)70.7 A
The peak to peak distance of a sinusoidal waveform displayed on a C.R.O. screen is 7 cm and the 'volts/cm' switch is on 27 V/cm. The peak voltage is given by 3.86 V O 189.00 V O 94.50 V O 133.62 V
The peak distance of a sinusoidal waveform displayed on a C.R.O. screen is 6 cm and the 'volts/cm' switch is on 33 V/cm. The peak to peak voltage is given by O 396.00 V O 5.50 V O 139.99 V O 99.00 V
Shown in the figure below is an "RL" circuit drive by an AC power source. The AC power source has an RMS voltage of Vps (RMS) = 9.84 Volts and is running at a frequency of f = 8.585e+04 Hz. The resistor has a resistance of R = 2170 and the inductor has an inductance of L = 3.54e-03 Henries. Vps R ww Write the FORMULA for the total impedance of the circuit Ztot = Determine the numerical value of Ztot = 2890.5 Determine the numerical value of $z= = 41 Determine the current through the circuit: • I(PEAK) = 4.81E-3 • I(RMS) = 3.404E-3 Determine the voltage across the resistor: • VR(PEAK) = 7.387 • VR(RMS) = 5.22 ✔✔ Amps ✔Amps Write the FORMULA for the phase of the total impedance of the circuit z... = | tan-1 2701 R x Volts X Volts Determine the voltage across the inductor: • VL(PEAK) = 9.184 • VL(RMS) = 6.49 ✔ Volts Volts L R²+ WL- ✔ degrees 2 If a second circuit were connected in parallel with the inductor, this circuit would be considered as: O a low-pass filter O a capacitive switcher…
3. Two circuit elements in series consume 60 VAR when connected to a 120 – V, 60 – Hz source. If the reactive factor is 0.6, what are the two components and what are their values?
In an experiment, the function generator is adjusted to generate a square voltage at a certain frequency. This voltage is displayed on an oscilloscope and the reading is 16 V peak-to-peak. The rms value of this voltage is .What will be the rms value of this voltage if the frequency is doubled? Select one: O 16 Vrms 32 Vrms O 8 Vrms . 8 Vrms ..... O 5.657 Vrms 5.657 Vrms ....... O 8 Vrms . 16 Vrms O 16 Vrms 8 Vrms ......