Q.4 (a) What are the functions of commutator and brushes in a DC motor?(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?(RẠ + Rp + KKpwm)?Taevwhere 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.(d) Define synchronous speed and slip.(e) Explain the principle of operation of a three phase induction motor.

They have asked about the functions of commutator and brushes in DC Machine.

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Engineering

Electrical Engineering

What are the functions of commutator and brushes in a DC motor?

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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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

Q.4 (a) What are the functions of commutator and brushes in a DC motor?
(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?
(RẠ + Rp + KKpwm)?
Taev
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.
(d) Define synchronous speed and slip.
(e) Explain the principle of operation of a three phase induction motor.

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