October 27, 2020 February 24, 2012 by Electrical4U. Often we want to control the speed of a DC motor on demand. This intentional change of drive speed is known as speed control of a DC motor. Speed control of a DC motor is either done manually by the operator or by means of an automatic control device.
What is meant by speed control?
: equipment designed to operate automatically under certain conditions to keep the speed of a railroad train within a predetermined rate.
Why is it necessary to control the speed of a DC motor?
DC Motors plays an important role in energy conversion process. It is a machine which converts electrical energy into mechanical energy. In mechanical system, speed varies with number of task so speed control is necessary to do mechanical work in a proper way. It makes motor to operate easily.
What are the 3 types of DC motors?
Types of DC Motors. There are 3 main types of DC motor that are available:- Series, Shunt and Compound. These terms relate to the type of connection of the field windings with respect to the armature circuit.
What are the applications of DC motor?
DC machines are also used in applications where high starting torque and accurate speed control over a wide range are important. Major applications for DC motors are: elevators, steel mills, rolling mills, locomotives, and excavators. Like other rotating machines, DC motors result from the interaction of two magnets.
What is motor speed?
The speed of a motor, measured in revolutions per minute (rpm), defines a motor’s ability to spin at a rate per unit time. The torque of a motor, measured in foot-pounds (ft-lb), is a rotational characteristic of the motor that is the algebraic product of force multiplied by distance.
How do you calculate the speed of a DC motor?
conductors in armature. Hence, speed of a DC motor is directly proportional to emf of rotation (E) and inversely proportional to flux per pole (φ). N=120f/P.
What are the advantages of DC motors?
Good speed control
DC motors offer highly controllable speed. By changing the armature or field voltage it’s possible to achieve wide speed variation and with this level of controllability, DC motors offer the precision required by a wide range of industry applications.