7.For a shunt excited motor, the maximum allowable current is twice of the full-loadcurrent. The full-load current is 10 A. The equivalent circuit of this motor is also shown below.The rheostat can change the resistance by moving the slider (contact). The counter electromotiveforce (CEMF) for this motor is 100 V at 1000 rpm. The power supply E, is 200 V. In this case:(1) Calculate the minimum resistor value R at 0 rpm ensuing the motor is running within the saferange, and calculate the power consumed by the rheostat R.(2) Calculate the minimum effective resistor value R at 100 rpm ensuing the motor is runningwithin the safe range, and calculate the power consumed by the rheostat R and the deliveredmechanical power.(3) Calculate the minimum resistor value R at 500 rpm ensuing the motor is running within thesafe range, and calculate the power consumed by the rheostat R the delivered mechanical power.shuntfieldRarmaturerheostatEs+Eo

Answered: Image /qna-images/answer/2b017874-7fc3-4e1b-9262-62cb5e3f04de.jpg

Answered: 7. For a shunt excited motor, the…

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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Similar questions

A 48kW, 600V, 1500 rpm separately excited dc motor is controlled by single phase semi-controlled converter. The resistance of the armature is 192 and of the field is 1450. The field circuit is controlled by a single phase fully controlled converter and its firing angle is set to 20. The AC supply voltage to the armature and field converters is a single phase 220V, 60 Hz. The voltage constant is 0.946 V/A rad/s. If the armature converter firing angle is 45 and the speed is 1200 rpm; calculate the armature current and the developed torque.
I:01)
A PWM signal is sent to a permanent magnet DC motor through an H-bridge circuit. The PWM frequency is 100 kHz, the DC voltage source is 16 volts, and the specification of the motor is given as: voltage = 16 volts, no load speed = 1500 RPM, holding torque = 2 Nm. a. Draw the voltage signal delivered to the motor when the duty cycle is 20% and 80% (at least draw for 5 periods). Calculate the speed of DC motor when the duty cycle is 20% and 80%. b. C. Estimate the output power when the duty cycle is 20% and 80%. Assume that the motor efficiency is 100%.
A four-pole induction motor drives a load at 2500 rpm. This is to be accomplished by using an electronic converter to convert a 400-V dc source into a set of three-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.
Consider a separately-excited DC motor with an armature resistance RA = 0.2 ohm and terminal voltage VT = 130 V. The motor rated speed is 1200 RPM. The field winding supply VF= 36 V and the field resistance is adjustable. The motor has compensating windings and interpoles.
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.
Q4/B/ What are the principal characteristics of a series DC motor? What are its uses? Core Mc
Needs Complete solution with 100 % accuracy.
A 240-volt series motor has an armature resistance of 0.42 ohm and a series-field resistance of 0.18 ohm. If the speed is 500 rpm when the current is 36 A, what will be the motor speed when the load reduces the line current to 21 A? (Assume a 3-volt brush drop and that of the flux is proportional to the current.). Ans.: 1435 rpm show diagram and step by step process
A 250 V series motor has an armature resistance of 0.2 ohm and a series-fieldresistance of 0.18 ohm. If the speed is 6oo RPM when the current is 32 amps.What will be the motor speed when the load is reduced so that the current is18 amps, under which condition the percent flux change is 50 % of the percentcurrent change.
Q3 Draw the equivalent circuit of a DC Motor, Separated Excited DC Motor and Compounded DC Motor. Label each component properly (a)
QA.2 a) b) c) d) 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. The machine operates at 25% of the rated speed with 75% of the rated load. Determine rectifier output voltage and the thyristor firing angle. A three-phase rectifier can operate with different load types at the output. One possibility is placement of a capacitor across the output. Explain when this is done and why?

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