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.
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 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
A A permanent magnet DC motor has an armature resistance supplied by a 75-V DC Source, 1.4 S2. When it n svy t no-load speed d 2200 pm and draws 1.7 A. a) what 6.) What is the rotational'loss ? TS the output power (in hp) when it is operated at from 1800 rpm a 70-V DC source 7
1. In CNC machine tools, the motors used to control feed rate are: A. Servo motors B. Induction motors C. Stepper motors D. Hydraulic motors 2. The purpose of a feedback device in a CNC machine tool is to provide information of: A. Speed B. Displacement C. Force D. Both speed and displacement 3. Federate on a machining center can be specified in: A. Only feed per revolution B. Either feed per minute or feed per revolution C. Only feed per minute D. Feed per tooth per revolution 4. The correct syntax of an NC block for inclined line milling operation is: A. N-G01 X-F B. N-G01 Z-F C. N-G01 X-Y F D. N-G01 M XY F 5. When the contour or continuous path system is used, A. Tool movement from one point to the next does not have to follow a specific path. 8. Tool travel is controlled along one axis at a time. C. Machine and tool movements are precisely controlled at all times and in all planes. D. None of the above. 6. Which of the following NC blocks is correct? A. N10 G01 M03 X90 Y-15 R22 B.…
Please solve all subdivisions please
A brushed DC motor is spinning at a maximum no-load speed of 6206 rpm. The nominal brush voltage drop is 0.67 V and the rated terminal voltage of the machine is 13 V. Determine the voltage constant, Ke, of the machine in Vs/rad.