i need the answer quickly Q.3In the microcomputer-controlled class-A IGBT transistor d.c. choppershown in Fig.2. , the input voltage Va= 260 V, the load is a separately-excited d.c. motor with Raspeed controlled over a range 0 – 2500 rpm , provided that the load torque iskept constant and requires an armature current of 30 A .= 0.28 2 and La= 30 mH. The motor is to be(a) Calculate the range of the duty cycle y required if the motor designconstant K.P has a value of 0.10 V/rpm.(b) Find the speed of the motor n (rpm) when the chopper is switchedfully ON such that the duty cycle y = 1.0.RaQ1DC voltageVaVdSLaI = Kr laFWDdriver11 PI-4uControllerFigure 2. IGBT d.c. chopper drive.

Given Ra =0.28Ω La =30 mH Full speed n= 2500 rpm Ia =30 A

In the microcomputer-controlled class-A IGBT transistor d.c. chopper shown in Fig.2., the input voltage Va= 260 V, the load is a separately- excited d.c. motor with Ra = 0.28 2 and La = 30 mH. The motor is to be speed controlled over a range 0 – 2500 rpm , provided that the load torque is kept constant and requires an armature current of 30 A. (a) Calculate the range of the duty cycle y required if the motor design constant K.P has a value of 0.10 V/rpm. (b) Find the speed of the motor n (rpm) when the chopper is switched fully ON such that the duty cycle y = 1.0.

In the microcomputer-controlled class-A IGBT transistor d.c. chopper shown in Fig.2., the input voltage Va= 260 V, the load is a separately- excited d.c. motor with Ra = 0.28 2 and La = 30 mH. The motor is to be speed controlled over a range 0 – 2500 rpm , provided that the load torque is kept constant and requires an armature current of 30 A. (a) Calculate the range of the duty cycle y required if the motor design constant K.P has a value of 0.10 V/rpm. (b) Find the speed of the motor n (rpm) when the chopper is switched fully ON such that the duty cycle y = 1.0.

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

1.determine the EMF @ torque equation of the the 4 diff.machines dc,ac,stepper,servo.to solve problems based on its application. Select suitable machine (select 1)and working principle for a given situation (give the situation) and application.
15.1 Consider a wind machine designed to deliver its rated power at the average velocity for a given wind spectrum. It will be marketed for sites having wind velocity spectra that have the same annual average velocity but with Weibull statistics ranging from k = 3/2 to 5/2. a. Calculate the ratio of maximum to minimum annual average on-site wind power available for exploitation for this range of wind fields. b. What additional assumptions are necessary if the power actually produced is to be in the same ratio as in (a) above?
For the given electromechanical system with all parameters in SI units, the motor used develops 50 Nm of torque at 3000/pi in rpm when 15 volts applied. It is stalled at this DC voltage with 150 Nm of torque. The armature inertia is 5 kg.m2 and damping is 2 N.m.s/rad. What is the equivalent load damping DL at the N3 port
The values obtained in the empty and short circuit tests of a 50 kW, 510 V, 60 Hz, 6 pole, 75 A, cosφ=0.86, Y-connected 1140 rpm, Class B ASM, whose connection form is given below, are given in the table. ThisFind the values of the approximate equivalent circuit elements of the ASM according to
An electric motor moves an object of a weight; the system is show in Figure 1. Given that Jm = 0.2 kgm2, Jd = 2000 kgm2, r = 0.5 m, the gear ratio ai = wm/wd = 40 and mass of the object, m is 20kg. (assume a loss-less system and g = 9.8m/s2) Obtain the equivalent moment of inertia, Jeq seen at the motor side. Obtain the equivalent load torque, seen at the shaft of the motor
A series DC machine with the armature winding resistance Ra=2Ω and the field windingresistance Rf=5Ω is mechanically coupled to the load with linear torque-speedcharacteristics that can be approximated by the following equation: Tl(ω)=k·ω+T0 where k=-2Nm/(rad/s) and T0=200 Nm. The motor constant Kf is equal to 0.22[Nm/A^2] also[Vs/(A·rad)]). The motor is supplied from a 250VDC source. a) Calculate all possible operating points and determine the stability of each operatingpoint
Consider a wind machine designed to deliver its rated power at the average velocity fora given wind spectrum. It will be marketed for sites having wind velocity spectra thathave the same annual average velocity but with Weibull statistics ranging from k = 3/2to 5/2.a. Calculate the ratio of maximum to minimum annual average on-site wind poweravailable for exploitation for this range of wind fields.b. What additional assumptions are necessary if the power actually produced is tobe in the same ratio as in (a) above?
An electric motor, developing a starting torque of 15 Nm, starts with a load torque of 7 Nm on its shaft. If the acceleration at start is 2 rad/sec2 , the moment of inertia of the systems must be (neglecting viscous and coulomb friction) A) 0.25 kg m2 B) 0.25 Nm2 C) 4 kg m2 D) 4 Nm2
To which of the following questions does an engineering economy analysis provide useful input? (a) Has the mechanical or electrical engineer chosen the most economical motor size given functional requirements? (b) Has the civil or mechanical engineer chosen the best thickness for insulating a building?(c) Has the biomedical engineer chosen the best materials for the company’s artificial knee product?(d) All of the above
A dc motor develops 55 N-m of torque at a speed of 600 rad/s when 12 V are applied. It stalls out at this voltage with 100 N-m of torque. If the inertia and damping of the armature are 7 ?? − ?2 and 3 ???/???, respectively, find the transfer function ?(?) = ?? (?)⁄??(?) and space-state representation of this motor if it drives an inertia load of 105 ?? − ?2 through a gear train, as shown in figure 3 a. Use Simulink to represent the space-state of the system and get the response of the motor.
The car of Light Railway Transit (LRT) is propelled by 660-volt DC motor connected to the DC teeder lines of rectifier station. This car is required to exert a tractive effort of 4,500 kg at a velocity of 50 km/hr. How much current will be drawn from the feeder lines if the overall efficiency of motor and the flywheel drive is 65%?
A PM DC motor with torque constant kPM is usedto power a hydraulic pump; the pump is a positivedisplacement type and generates a flow proportional tothe pump velocity: qp = kpω. The fluid travels througha conduit of negligible resistance; an accumulator isincluded to smooth out the pulsations of the pump.A hydraulic load (modeled by a fluid resistance R) isconnected between the pipe and a reservoir (assumedat zero pressure). Sketch the motor-pump circuit.Derive the dynamic equations for the system, anddetermine the transfer function between motor voltageand the pressure across the load.