A.2 a) b) A 480 V permanent-magnet excited DC motor has armature resistance of 1.5 . When driving a load of constant load torque at rated speed of 1200 rpm, the armature takes rated 20 A. Speed is controlled by armature voltage variation, and armature is supplied from a three-phase fully controllable bridge rectifier. Available AC voltage is three-phase 415 V, 50 Hz, interfacing transformer is not used, and armature current is continuous. The machine operates at rated speed with rated load. Determine rectifier output voltage and thyristor firing angle. Determine the rated motor torque and power. at 250 d with 750/

A.2 a) b) A 480 V permanent-magnet excited DC motor has armature resistance of 1.5 . When driving a load of constant load torque at rated speed of 1200 rpm, the armature takes rated 20 A. Speed is controlled by armature voltage variation, and armature is supplied from a three-phase fully controllable bridge rectifier. Available AC voltage is three-phase 415 V, 50 Hz, interfacing transformer is not used, and armature current is continuous. The machine operates at rated speed with rated load. Determine rectifier output voltage and thyristor firing angle. Determine the rated motor torque and power. at 250 d with 750/

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

See similar textbooks

Similar questions

Consider a shunt DC motor with an armature resistance RA=0.2 ohm and terminal voltage VT = 160 V. The motor rated speed is 1800 RPM. The total field resistance 240 ohm. Assume No armature reaction in this machine. The variation of the armature terminal voltage as a function of the field current is measured under no-load conditions and shown below:
Q5- Adjust a fire angle for a three-phase full-wave semi-controlled converter to feed the separately exciter DC motor to get a load torque can be reached to 750 rpm. When the supply voltage of converter is 150 volts per-phase and the absorbed current through the armature 40A with resistance 0.2 a and a constant back emf 0.4v/rpm. Then find the maximum speed for motor assume the previous parameters values are a constant.
A four-pole induction motor drives a load at 2405 rpm. This is to be accomplished by using an electronic converter to convert a 400V dc source into a set of three-phase ac voltages. a) Find the frequency required for the ac voltages assuming that the slip is 4 percent. The load requires 2hp. b) If the dc-to-ac converter has a power efficiency of 93 percent and the motor has a power efficiency of 80 percent, estimate the current taken from the dc source.
power electronics and drives
A 440 V, shunt motor has armature resistance of 0.8 ohm and field resistance of 200 ohm. Determine theback emf when giving an output of 7.46 kW at 85% efficiency.
4. A 120-V shunt DC motor has armature resistance R=0.22 and and field resistance Rp=602 . The rated full load current is 42 A. Calculate the following: ( Calculate the following 1. ting current if the motor is dira the current as a p 2. The valuee external resistaa he connected in series with armature circuit to t starting current to 150% of the full loauent. Pacross the 120V supply. Express of the full load value. (B) Design a starting circuit for the DC motor that will limit maximum starting current to 150% of rated armature current. 1. Find number of stage in the starting cicuit 2. Find Ea at the end of each stage 3. Find the resistance of each stage
"A 220 V, compensated shunt motor driving a 1084.8 N.m torque load is running at 1000rpm. The efficiency of the motor at this load is 92 percent. The combined armature, compensating winding and interpole resistance is 0.01 ohm, and the resistance of the shunt field is 65 ohm. Determine the following parameters of the motor: (i) Input power (in kW) (ii) Field current (in Amp) (iii) Armature current (in Amp) (iv) Induced voltage in armature (in volts) (v) Torque developed by motor (in N.m) and (vi) The resistance of a dynamic breaking resistor (in ohm) that will be capable of developing 678 N.m of braking torque at a speed of 750 rpm. Assume windage and friction at 750 rpm is the same as at 1000 rpm. [Hint: 1 lb-ft = 1.356 N.m]" T T T Arial v 3 (12pt) - T-
A 250 V shunt motor, having an armature resistance of 0.2 ohm draws fromthe mains a current of 50 A on half full load. The speed is to beincreased to twice half full load speed. If the torque of the motor is ofconstant magnitude, determine the percentage change in flux required.[Ans. 52.29] I WANT A DIFFRENT APPROACH (NOT COPY PASTE ON LIBRARY)
A 220 V shunt motor takes a current of 20A. Resistance of the shunt field is 200 ohm and of the armature 0.3 ohm. Find the armature current and back emf.
A 1200 rpm, 700V Series DC motor has an armature resistance of 20 and the field resistance of 90. If the rotational losses is 450W and the efficiency is 71% , the output power of the motor in Kwatt is
power electronics and drives
Q6/ Answer the following questions: 1. Define the DC motor drive 2. Classify the DC motor drive 3. How can be controlling on the speed of DC motor 4. Numerate the types of AC-DC converter 5. Draw the circuit of single -phase converter on separately excited DC motor 6. Write the equations the following: I. Speed(W)= II. Torque developed(Td): III. Vm=..