Speed Control of DC Motor
Speed control means intentional change of the drive speed to a value required for performing the specific work process. Speed control is a different concept from speed regulation where there is natural change in speed due change in load on the shaft. Speed control is either done manually by the operator or by means of some automatic control device.
One of the important features of dc motor is that its speed can be controlled with relative ease. We know that the expression of speed control dc motor is given as,
Therefore speed (N ) of 3 types of dc motor – SERIES, SHUNT AND COMPOUND can be controlled by changing the quantities on RHS of the expression. So speed can be varied by changing
(i) terminal voltage of the armature V ,
(ii) external resistance in armature circuit R and
(iii) flux per pole φ .
The first two cases involve change that affects armature circuit and the third one involves change in magnetic field. Therefore speed control of dc motor is classified as
1) armature control methods and
2) field control methods
.
Speed control means intentional change of the drive speed to a value required for performing the specific work process. Speed control is a different concept from speed regulation where there is natural change in speed due change in load on the shaft. Speed control is either done manually by the operator or by means of some automatic control device.
One of the important features of dc motor is that its speed can be controlled with relative ease. We know that the expression of speed control dc motor is given as,
Therefore speed (N ) of 3 types of dc motor – SERIES, SHUNT AND COMPOUND can be controlled by changing the quantities on RHS of the expression. So speed can be varied by changing
(i) terminal voltage of the armature V ,
(ii) external resistance in armature circuit R and
(iii) flux per pole φ .
The first two cases involve change that affects armature circuit and the third one involves change in magnetic field. Therefore speed control of dc motor is classified as
1) armature control methods and
2) field control methods
.
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