X.PROBLEM: (Show your solution) 1. A 550-volt long shunt compound motor has an armature resistance of 0.815 ohm and a series field resistance of 0.15-ohm. The full load speed is 1900 rpm when the armature current is 22-Amp. a) At what speed will the motor operate at no load if the armature current drops to 3-amp with corresponding drop in flux to 88 % of the full load value. Assume a brush drop of 5-volts at full load and 2-volt at no load b) Calculate the percent speed regulation of the motor.

X.PROBLEM: (Show your solution) 1. A 550-volt long shunt compound motor has an armature resistance of 0.815 ohm and a series field resistance of 0.15-ohm. The full load speed is 1900 rpm when the armature current is 22-Amp. a) At what speed will the motor operate at no load if the armature current drops to 3-amp with corresponding drop in flux to 88 % of the full load value. Assume a brush drop of 5-volts at full load and 2-volt at no load b) Calculate the percent speed regulation of the motor.

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

I need the answer as soon as possible
A 4-pole series motor has 800 lap connected armature conductors. At a certain load, the flux per pole is60mWb and the total mechanical torque developed is 400 N-m. Calculate the line current taken by themotor and the speed at which it will run with a back emf of 400 V. Total motor resistance is 4 ohm.
Which of the following is the main purpose of commutating poles in DC machine ? To stabalise the speed To increase the starting torque To increase the counter emf To eliminate sparking at brushes
Q1 Describe the Characteristics, characteristics, efficiency calculations, their applications Of DC Motors in detail
(c) What are the principle characteristics of DC series motor and DC compound motor, and what are its uses?
A DC series motor is driving a load whose torque is constant and independent of the speed. The motor speed is increased from 1000 RPM to 1200 RPM by connecting a diverter resistance across its field. Find the Armature to the field winding current. Assume negligible drop across the field winding and a linear magnetic circuit
The relation between armature torque and armature current of a DC motor is Parabolic Linear Inverse Exponential
- The speed of dc shunt motor can be varied by: a) The voltage V applied to armature. b) The armature circuit resistance Ra. O c) The flux Ø. d) All the mentioned above.
In order to get higher speed of Dc motor the ..... ....... voltage supply most be low back emf (Eb) most be high O frequency most be constant
On full-load a 300 V series motor takes 90A and runs at 15 rev/s. The armature resistance is 0.1 ohm and the series winding resistance is 50 m.Determine the speed when developing full load torque but with a 0.2 ohm diverter in parallel with the field winding. (Assume that the flux is proportional to the field current.
Q2) Determine the back e.m.f at this load of series motor has a series field resistance of (0.301 2) and an armature resistance of (0.1892).It is connected to a (220 V) supply and at a particular load runs at (1500 r.p.m) when drawing (16.2 A) from the supply, if that this cases a three times of flux. Calculate the speed of motor when the load is changed such that the current is increased to (32.23 A).
Q15. A series-wound motor is connected to a d.c. supply and develops full-load torque when the current is 30 A and speed is 1000 rev/min. If the flux per pole is proportional to the current flowing, find the current and speed at half full- load torque, when connected to the same supply.