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/

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

Design a DC motor circuit to drive A fan-type load with a torque equation equal to: TL=1.34×10−7ω2TL=1.34×10−7ω2 N.m The fan speed range is from 500 to 1200 rpm. To achieve the required operation, the armature voltage of the motor is adjusted by a single-phase, full-wave, ac/dc converter. The input voltage and frequency to the converter are 480 V (rms) and 50 Hz. choose the motor type, show the motor rating, αα range, Supply voltage, and frequency, and any required other information Modify the design to automatically adjust the voltage drive the load within the specified speed range. show the control variable, controller type, connection, and controller weights. design the single-phase, full-wave, ac/ dc converter. show design specifications, the reason for DC motor selection. correct manual circuit, and correct automatic closed-loop control circuit
Design a DC motor circuit to drive A fan-type load with a torque equation equal to: TL=1.34×10−7ω2TL=1.34×10−7ω2 N.m The fan speed range is from 500 to 1200 rpm. To achieve the required operation, the armature voltage of the motor is adjusted by a single-phase, full-wave, ac/dc converter. The input voltage and frequency to the converter are 480 V (rms) and 50 Hz. choose the motor type, show the motor rating, αα range, Supply voltage, and frequency, and any required other information Modify the design to automatically adjust the voltage drive the load within the specified speed range. show the control variable, controller type, connection, and controller weights.
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.
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.
A separately, excited Dc motor fed from3-phase semi-controlled rectifier develops a fullload torque at 1500 rpm. When firing angle Zerothe armature taking 50A and havinghaving an armatureresistance of 0.5ohm. when the motor back emfConstant is 0.25 V/rpm. Calculate the supplyVoltage per phase, find also the range ofangle required to give speed between 1500rpmand 750 rpm at full load torque.
A DC chopper is used in regenerative breaking mode of a dc series motor. The dc supply is 600 V, the duty cycle is 70%. The average value of armature current is 100 A. It is continous and ripple free. What is the value of power feedback to the supply ?
A DC chopper is used in regenerative braking mode of a dc series motor. The dc supply is 600 V, the duty cycle is 70%. The average value of armature current is 100 A. It is continuous and ripple free. What is the value of power feedback to the supply ?
A series dc motor 20-hp, 500-V, is having armature, series field and shunt field winding resistances of 0.08 Ω, 0.3 Ω and 125 Ω, respectively. If the back – emf is 478 V, determine the motor current when the connection is a) long – shunt. b) short – shunt c) series d) shunt
A 200V, 875rpm, 150 A separately excited dc motor has an armature resistance of 0.06Ω. It is fed from a single phase fully controlled rectifier with an ac source voltage of 220V, 50Hz. Assuming continuous conduction. Determine motor speed for α = 160o and half rated torque.
The speed of a 150 hp, 650V, 1750 rpm, separatley excited DC motor is controlled by 3-phase, 460v, 50Hz supply full - converter. The rated armature current of the motor is 170A. The motor parameters are: R, = 0.0992, L = 0.73 mH, and K, O = 0.33 V / rpm. Neglect the losses in converter system, determine: A) No - load speed at firing angle a = 0 ° and a = 30 °. Assume that the no - load armature current is 10% of the rated current? B) The firing angle to obtain rated speed and rated current?
The armature resistance of a compound direct current motor with a long shunt is given as 0.25 Ω, the series winding resistance is 0.35 Ω and the shunt windingresistance is 600 Ω. Ifthe armature of the direct current motor rotates at 1200 rpm, and it draws 25 amps from the armature windings to create a torque of 140 Nm, find the efficiency of the 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.