(b) List three methods that can be used to control the speed of DC motors. Explainwhy one of the methods may not be suitable for series-connected DC motor.(c) Show that the torque-speed characteristic of a series-connected DC motor is givenby:KK,V;(Ra + Rp + KK-wm)?Taev%3Dwhere Tdev is the torque developed in the machine, RA is the resistance in armaturecircuit, RF is the resistance in the field circuit, K is the machine constant thatdepends on the design parameters of the machine, om is the angular velocity of therotor, KF is a constant that depends on the number of field windings, the geometryof the magnetic circuit, and the B-H characteristics of the iron and VT is thevoltage applied to the armature.

NOTE: “Since you have asked multiple question, we will solve the first question for you. If you want…

Answered: (b) List three methods that can be used…

(b) List three methods that can be used to control the speed of DC motors. Explain why one of the methods may not be suitable for series-connected DC 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

Related questions

Q: A 220 V dc shunt motor draws a current of 50 A from the supply and runs at 900 rpm. Its armature and…

Q: Does a DC motor have to be turning in order for it to develop torque? a) yes b) no Most DC motor…

A: The Dc motor is electrical machinery that converts electrical and mechanical energy

Q: 3. A 4-pole, 250-V, d.c. shunt motor has a lap-connected armature with 960 conductors. The flux per…

A: Here DC shunt motor is given and we have to find developed torque and useful torque

Q: Explain the construction , working principle and derivation of the torque induced in a DC Motor .…

Q: A 240 V shunt motor has an armature current of 15 A when running at 800 rpm against full-load…

A: In this question we need to find a What resistance must be inserted in series with the armature to…

Q: A dc shunt motor runs at 600 rpm on a 240V supply while drawing a line current of 30 A. Its armature…

A: initial speed, N1=600 RPM terminal voltage, V=240V line current, IL=30 A final speed,N2=400 RPM…

Q: R1. An inside-out motor is a brushless DC motor that produces a large amount of inertia because of…

A: Brushless DC motors or permanent DC motors are similar

Q: A DC generator has terminal voltage of 250 V and an induced voltage of 262 V when the generator is…

Q: The armature of a 8 pole DC motor carries 314 conductors which are lap connected . For an armature…

Q: Besides low cost, what are five desirable characteristics for an induction motor?

A: Characteristics of an induction motor besides slow cost are as follows 1) It has high pull out…

Q: Name and briefly discuss the types of power loss in a shunt-connected dc motor.

A: The various losses that are present in shunt-connected dc motor are as follows; 1) Copper and…

Q: what

A: For the above given question we need to list advantages of gear motors.

Q: Explain any 3 industrial applications of dc motors

A: Applications of Dc motors in industry: Dc motors are 1) Dc series motor: high starting torque…

Q: List down 3 main parts of DC motor

A: A DC Motor is a machine that converts DC electrical current into mechanical energy. In a DC motor,…

Q: What is the effect of load on the efficiency of an induction motor? II. Explain the term air-gap…

A: As per the guidelines we supposed to answer one question at a time, so please ask other questions…

Q: The permanent magnet machines (PMM) known as "Brushless Permanent Magnet Motors", "Brushless DC…

A: The brushless dc motors and brushless permanent magnet motor are the same things. There is a…

Q: We need to derive an oil burner with single phase induction motor. Suggest the best type of single…

A: Compared to Two Value Capacitance Induction Motor, the key benefit of capacitor start induction…

Q: (b) (i) Discuss THREE advantages of a brushless DC motor over a conventional DC motor, Gi) (ii)…

A: b) i)We need to discuss three advantages of a brassless DC motor over a conventional DC motor.…

Q: Explain theory of a separately excited DC motor.

Q: DEGREE: ELECTRICAL ENGINEERING SUBJECT/COURSE: AC MACHINES Answer the following questions (A,…

A: INDUCTION MOTOR Induction motors are most popular around 90% of motor used generally are…

Q: (c) Briefly explain the operation of an alternator. A 440 V, shunt motor has armature resistance of…

Q: 5. A 220-volt shunt motor draws 64-Amp and runs at 500 rpm. Armature resistance, 0.25- ohm, field…

A: In this question, We need to determine the speed of the motor when external resistance is added to…

Q: Name the major parts of a DC motor

A: DC motor is a device which converts electrical energy into the mechanical energy. The major parts of…

Q: Explain the different losses involved with DC shunt motors

Q: 2. Explain the principle operation of DC Motor.

A: It is given that: DC motor

Q: In examining a single-phase ac motor, what features could we look for to identify it as a universal…

A: First of all, to examine the universal motor, examine the motor's construction means to examine the…

Q: A 4-pole, 250-V, d.c. shunt motor has a lap-connected armature with 960 conductors. The flux per…

A: Given:

Q: Sketch armature current (y-axis) - torque (x-axis) characteristics of compound DC motor for three…

A: A compound DC motor connects the armature and fields windings in a shunt and a series combination to…

Q: Describe the construction and operation of a DC Motor. How is speed controlled and can the motor be…

A: Asked to explain the construction of DC motor?Operation of DC motor?Speed control and motor reversal…

Q: Follow the instructions given in the question and then sketch the speed current characteristic for a…

A: We have to sketch the speed current characteristic for a common DC motor and describe the motor…

Q: 3- What is the function of a commutator in the DC motor?

A: DC motor converts electrical energy into mechanical energy.

Q: (a) Describe a single wire DC motor with the help of a diagram.

Q: Sketch the torque versus speed characteristic for a series-connected dc motor.

A: The circuit diagram of the DC series motor can be drawn as Thus for constant power motor : Ns α 1Γ…

Q: With the aid of a diagram as shown, explain how does AC generator work and describe the operating…

A: AC generator working: As per Faraday's law of electromagnetic induction, an EMF is induced in the…

Q: S5. b) By defining the motor, write down the types of DC motors?

A: Given To define Motor and write types of DC motors.

Q: Write an abstract with these topics for DC MOTORS: Types of DC Motors and its Speed Regulation…

A: as per policy I can answer only 3 subparts. Kindly resubmit remaining 2 in new post. 1. Types of DC…

Concept explainers

DC Series Motors

A DC motor is a type of electric motor which converts electric energy into mechanical energy. The forces that are produced by the magnetic field are what those common types of motors rely upon. Either electro-mechanical or electronic, all types of DC motors have some internal mechanism to change the current direction in part of the DC motors. As the DC motors could be powered from existing DC lighting power distribution systems, these motors were the first form of motors widely used. By changing the strength of the current in its field winding or by using a variable supply voltage, the speed of the DC motors can be controlled over a wide range.

Question

100%

(b) List three methods that can be used to control the speed of DC motors. Explain
why one of the methods may not be suitable for series-connected DC motor.
(c) Show that the torque-speed characteristic of a series-connected DC motor is given
by:
KK,V;
(Ra + Rp + KK-wm)?
Taev
%3D
where Tdev is the torque developed in the machine, RA is the resistance in armature
circuit, RF is the resistance in the field circuit, K is the machine constant that
depends on the design parameters of the machine, om is the angular velocity of the
rotor, KF is a constant that depends on the number of field windings, the geometry
of the magnetic circuit, and the B-H characteristics of the iron and VT is the
voltage applied to the armature.

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

VIEW

Step 1

VIEW

Step 2

VIEW

Step by step

Solved in 3 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.

Similar questions

. A Short Shunt Compound DC Generator supplies 100-amp at 110-volt. Series field resistance of 0.04-ohm, armature resistance is 0.05-ohm, shunt field resistance of 57- ohm. Iron and friction losses mount to 852-watts. Find the power input and the over all efficiency.
Stator Voltage Control of an Induction Motor using PWM The objective: The objective of this experiment is to present the voltage control of induction motor Discussion: 1. Briefly, discuss the starter voltage of induction motor speed control? 2. What are the disadvantages of this method?
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?
Q2- A 6 pole lap connected DC generator has 480 turns ,the resistance of each turn is 0.03 Q, the flux per pole is 0.042 Wb and the machine is driven at 1200 rpm. Find E, and terminal voltage at full load armature current of 45 A
Explain the types of dc generator and motors on the basis of excitation.
Write down the specification of motor and stator for (a) DC motor (b) AC motor
c) Discuss how armature resistance could be used to control the speed of a DC motor.
- 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.
5) Flux control, voltage control, and armature control are three methods for ...... of dc motor.
The armature resistance of a shunt motor fed from a 220 Volt DC source is 5 ohms and the resistance of the excitation winding is R ohm and it rotates stably. Then, a resistance of R ohm is added to the excitation circuit (a resistor with the same value as the winding resistance) to control the speed. How many RPM is the motor in the last state in steady state.Mechanical losses will be neglected, motor magnetically linear, no saturation, temperature change will be neglected.Armature current = Ia = 4 ALoad torque=Tload= 7 Nm
List down 3 main parts of DC motor