Electrical Engineering ⇒ Topic : Speed Control of DC Motors
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Maninder
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The speed of a dc motor can be altered by varying either the armature back emf or flux or both as given by Equation
Practically, these variations are accomplished simply by inserting a field resistor in series with the field winding or by inserting a variable resistor in series with the armature. | |
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Gaurav
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SPEED CONTROL OF D.C. MOTORS Factors Controlling the Speed D.C. machines are generally much more adaptable to adjustable speed service. The ready availability of D.C. motors to adjustment of their operating speed over wide ranges and by a variety of methods is one of the important reasons for the strong competitive position of D. C. machinery in modern industrial applications.The speed of a D.C. motor can be expressed by the following relationship Therefore, the speed of D.C. motor can be regulated by changing Φ, R or V, in other words,by 1. Field control 2. Rheostatic control 3. Voltage control | |
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