Electrical Engineering ⇒ Topic : Speed Control of D.C. Motor with Thyristor
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David
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Speed Control of D.C. Motor with Thyristor The speed of a D.C. motor is controlled with thyristor as follows :
With combined armature and field control, the speed can be controlled from zero to maximuni value with automatic change-over from armature control to field control and vice-versa.Speed from zero to rated value is obtained as usual from armature voltage control.Adjustable armature voltage can either be obtained from controlled rectifier circuits, often called the converters, or from chopper circuits, the latter are, normally employed when D.C.supply is easily available.
Instead ofcontrolled rectifier circuits, it is possible to use an uncontrolled rectifier, which provides a constant direct voltage, followed by a chopper to give a variable mean direct voltage output. | |
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