A DC, separately excited motor is used to drive a constant-torque load. The field circuit is excited by a full-wave, AC/DC SCR converter. The armature circuit of the motor is connected to a constant dc voltage source of 160 V. The inductance of the field circuit is large, and the field current is continuous. The field AC voltage (input to the converter) is 147 V (rms), and the field resistance is 100 N. The armature resistance is 1.2 N. When the triggering angle of the SCRS is adjusted to zero, the motor speed is 1000 rpm, and the armature current is 10 A. • Calculate the average current and dc power of the field A1 circuit when the triggering angle is equal to 15°. If = La Ra Va A R P; = W M F2 • If the motor speed is to be increased to 1400 rpm, what is the triggering angle? (a) Circuit

A DC, separately excited motor is used to drive a constant-torque load. The field circuit is excited by a full-wave, AC/DC SCR converter. The armature circuit of the motor is connected to a constant dc voltage source of 160 V. The inductance of the field circuit is large, and the field current is continuous. The field AC voltage (input to the converter) is 147 V (rms), and the field resistance is 100 N. The armature resistance is 1.2 N. When the triggering angle of the SCRS is adjusted to zero, the motor speed is 1000 rpm, and the armature current is 10 A. • Calculate the average current and dc power of the field A1 circuit when the triggering angle is equal to 15°. If = La Ra Va A R P; = W M F2 • If the motor speed is to be increased to 1400 rpm, what is the triggering angle? (a) Circuit

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter12: Power System Controls

Section: Chapter Questions

Problem 12.4P

See similar textbooks

Similar questions

A four-pole induction motor drives a load at 2500 rpm. This is to be accomplished by using an electronic converter to convert a 400-V dc source into a set of three-phase ac voltages. Find the frequency required for the ac voltages assuming that the slip is 4 percent. The load requires 2 hp. If the dc-to-ac converter has a power efficiency of 88 percent and the motor has a power efficiency of 80 percent, estimate the current taken from the dc source.
A 3-phase, 4-pole induction motor drives a conveyor which needs a constant torque over its entire operating speed range. The per-phase rotor resistance referred to the stator side is 0.74 2. The motor is fed from a 3-phase inverter-based adjustable speed drive, with a volt per hertz control scheme. When the fundamental component of the inverter line output voltage is 400 V (rms), 50 Hz, the motor operates at its rated speed of 1470 rpm. The electromagnetic torque produced by the motor can be approximated as: (a) Estimate the rated mechanical power output and air-gap flux of the motor. (b) It is proposed to reduce the power consumption of the drive by operating at half of the rated speed. Estimate the required fundamental line voltage and frequency of the inverter (c) Assess the effect of the stator winding parameters on the air-gap flux found in Part(a)
base on below mentioned Comparison of the performance indexes discuss and advice best induction motor.
Describe the basic circuit of DC Generators including its yoke, fid windings, interpoles, fieldpoles, difference of shunt coils and series coils, commutator and brushes ?
a. Qualitatively describe the magnetic field set up in the air gap of a four-pole three-phase induction motor by the currents in the stator windings. b. Give an equation for the field intensity as a function of angular position around the gap and time, defining the terms in your equation.
Discuss how the Torque is developed in an Induction Motor.
Q5:- Adjust a fire angle for a three-phase fullwave semi-controlled converter to feed the separately exciter DC motor to get a load torque that can be reached to 730 rpm. When the supply voltage of converter is 160 volts per-phase and the absorbed current through the armature 40A with resistance 0.2 and a constant back emf 0.4v/rpm. Then find the maximum speed for motor assume the previous parameters values are a constant.
Make a sketch to show the speed torque characteristics of a series, and PMDC motor.
A 4-pole induction motor drives a load at 2500 rpm. This is to be accomplished by using an electronic converter to convert 400 Volts DC into a set of 3-phase AC voltages. Find the frequency required for the AC voltages assuming that the slip is 4 percent. The load requires 2 hp. If the DC-to-AC converter has a power efficiency of 88 percent and the motor has a power efficiency of 80 percent, estimate the current taken from the DC source.
A separately excited motor runs at 1045rpm, with a constant field current, while taking an armature current of 50A at 120V. The armature resistance is 0.1 Ω if the load on the motor changes such that it now takes 95A at 120V, determine the motor speed at this load.
Type your question here Prove that the power developed by a three-phase induction motor is maximum when the equivalent load resistance RL is equal to the magnitude of the standstill impedance of the motor Zol. Then find the maximum power and slip at which occurs.
Find the Torque equation for the Dc motor seperately excited ؟