A 120 V, 5.6 kW, 1900 rpm d shunt motor requires only 16 volts to send armature-full-load current through the armature when the armature is held stationary. Neglect the rotational losses. (a) Determine the armature current if full line voltage is impressed across the armature at starting. (b) Determine the value of the external resistance needed in series with the armature to limit the starting current to 1.5 times the full-load current. (c) The motor is coupled to a mechanical load by a belt and is delivering full load (V, =120 V, n=1900 rpm, I, = I, ratea). If the belt breaks, determine the speed of the motor. Assume that, due to armat reaction, the flux at full load is 9 % less than the flux when the motor is idling. (a) Armature current = A (b) Start-up resistance = (c) Idling speed = rpm

A 120 V, 5.6 kW, 1900 rpm d shunt motor requires only 16 volts to send armature-full-load current through the armature when the armature is held stationary. Neglect the rotational losses. (a) Determine the armature current if full line voltage is impressed across the armature at starting. (b) Determine the value of the external resistance needed in series with the armature to limit the starting current to 1.5 times the full-load current. (c) The motor is coupled to a mechanical load by a belt and is delivering full load (V, =120 V, n=1900 rpm, I, = I, ratea). If the belt breaks, determine the speed of the motor. Assume that, due to armat reaction, the flux at full load is 9 % less than the flux when the motor is idling. (a) Armature current = A (b) Start-up resistance = (c) Idling speed = rpm

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

A 10 kW, 250 V Shunt motor has an armature resistance of 0.5 ohm and a field resistance of 200 ohm. At no load and rated voltage, the speed is 1200 rpm and the armature current is 3 A. At full load and rated voltage, the line current is 47 A and because of armature reaction, the flux is 4 % less than it no load value. a.) What is the full load speed? b.) What is the developed torque at full load?
250 V d.c. Shunt motor has an armature current of 20A when running at 1000 r.p.m at full load. The armature resistanc is 0.5 ohm. What resistance must be inserted in series with the armature to reduce the speed to 500 r.p.m. Assume load torque constant and magnetization curve to be linear
A 250 V DC shunt motor runs at 950 rpm and takes a line current of 55A.Find the resistance to be added to the field circuit to increase the speed 1200 rpm at an armature current of 75A.Take magnetic flux proportional to field current. Armature resistance is 0.1 ohm and field winding resistance is 125 ohms.
A shunt motor is rotating at 1500 rpm and is powered by a 120V voltage source. The current line resistance is 51-A and the shunt field resistance is 120ohm. If the armature resistance is 0.12ohm, Determine: a) the armature current, b) the back emf (E), c) the total power that is supplied to the motor, d) the power absorbed by the armature, e) power dissipated in the armature. Please answer all subpart either dislike please I will like it please
A dc shunt motor runs at 900 rpm from a 400V supply when taking an armature current of 25A. Calculate the speed at which it will run from a 230V supply when taking an armature current of 15A. The resistance of the armature circuit is 0.75ohm. Assume the flux per pole at 240V to have decreased to 75% of its value at 400V
A 4 pole10V, DC shunt motor operates on a load current 10A, having wave connected armature with 200 conductors. The flux per Pole is 25 m Wb. Resistance of shunt field winding is 1 ohm and resistance of the armature is 0.15 ohm. a) what would be the back emf?
Problem 3 A dc shunt motor runs at 900 rpm from a 400V supply when taking an armature current of 25A. Calculate the speed at which it will run from a 230V supply when taking an armature current of 15A. The resistance of the armature circuit is 0.8ohm. Assume flux per pole at 230V to have decreased to 75% of its value at 400V.
A shunt motor is rotating at 1500 rpm and is powered by a 120V voltage source. The current line resistance is 51-A and the shunt field resistance is 120ohm. If the armature resistance is 0.12ohm, Determine: a) the armature current, b) the back emf (E), c) the total power that is supplied to the motor, d) the power absorbed by the armature, e) power dissipated in the armature. You have to answer all subpart not only first three subpart Either dislike is ready
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:
the BLDC motors have the advantage of High Efficiency Compactness Low Maintenance All of the answers When the speed of the DC motor is Increases its Armature current Remain Constant Decreases Increases Any of the answers A variable reluctance stepper motor is constructed of .. . material with salient poles. ferromagnetic paramagnetic non-magnetic diamagnetic
A 4 pole 10V, DC shunt motor operates on a load current 10A, having wave connected armature with 200 conductors. The flux per Pole is 25 m Wb. Resistance of shunt field winding is 1 ohm and resistance of the armature is 0.15 ohm. a)What will be the factors to minimize the back emf?
Does a DC motor have to be turning in order for it to develop torque? a) yes b) no Most DC motor consist of many turns per armature loop as well as many evenly distributed loops per al mature. a) true b) false Brushes a DC motor. a) are part of the electrical circuit in b) provide a sliding electrical contact to the commutator of c) are made of a material which is softer than the commutator segments of d) all of the above