A DC separately excited motor drives a centrifugal pump at a speed of 1100 rpm when the terminal voltage and line currents are 215 V and 56 A, respectively. The armature and field resistances are 0.2 N and 145, respectively. 1- Calculate the resistance that should Quality Control in Construction: Centrifugal Pump be added Radd N to the armature circuit to reduce the speed to 770 rpm. Radd 2- Design a starting resistance for a maximum starting current of 112 A in the armature circuit. Radd Ω

A DC separately excited motor drives a centrifugal pump at a speed of 1100 rpm when the terminal voltage and line currents are 215 V and 56 A, respectively. The armature and field resistances are 0.2 N and 145, respectively. 1- Calculate the resistance that should Quality Control in Construction: Centrifugal Pump be added Radd N to the armature circuit to reduce the speed to 770 rpm. Radd 2- Design a starting resistance for a maximum starting current of 112 A in the armature circuit. Radd Ω

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...

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The armature circuit of a free excited direct current motor with a nominal voltage of 600 V is fed from an adjusted direct voltage source. The excitation circuit is also powered from a regulated voltage source. It is used in an application that requires motor speed adjustment. The speed of the motor at the nominal armature voltage was measured as 1600 rpm. All losses of the motor and voltage source and the effect of armature reaction are neglected. It is accepted that the engine is not saturated.Answer the questions below.a) Draw the armature and excitation circuit of the motor and write the formulas for the equivalent circuit.b) If the load moment of the motor at the nominal armature voltage is 420 Nm, then calculate the armature current and the input power of the motor.c) If the armature voltage of the motor is kept constant at 600 V and the excitation current is decreased until the speed reaches 4000 rpm, then calculate the shaft moment. Show this working area on the M = f (W) axis.
Q1 Describe the Characteristics, characteristics, efficiency calculations, their applications Of DC Motors in detail
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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
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Subject: Electrical Machines
Reducing the supply voltage so that Vnew = Vold / V3 reduces the maximum torque of the motor so that Tmaxnew= ...Tmaxold . * .... ...
A 500 V DC shunt motor takes 4 A at no-load. The shunt field winding resistance and the armature winding resistance are 250 and 0.2 respectively. Find the efficiency when the motor draws a current of 10 A at full load.