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Vedam Subrahmanyam Electric Drives Pdf Free 14
there are various types of d.c. drives. the most common type of d. drive is the semi-conductor drive. in this type of drive, a thyristor-based electronic inverter creates a variable voltage for the motor. the electronic inverter comprises a bridge of thyristors, with each thyristor connected to the power line through a series of diodes. the thyristors are usually turned on and off in a fixed time pattern to create a variable voltage. this voltage is applied to the motor armature through brushes or slip rings, and varies the motor speed. in the semi-conductor drive, the armature current is the direct current. the armature current is controlled by the thyristor firing angle, which varies the speed of the motor. the firing angle is controlled by the thyristor gate current, which varies the time delay between thyristor firing. 28 in some drives, the armature current is not direct current and the armature current is controlled by the converter firing angle. 29
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