Variable Speed Drives (VSDs) are employed in the industrial applications where different speeds are require to operate certain process systems. VSDs consists of rectifying unit for converting ac to dc, intermediate circuits mainly consists of inductors and capacitors for smoothing of dc waveform, inverter circuit for converting dc to ac of variable voltage and frequency and control circuit whose function is to receive and send signals to rectifier, inverter and intermediate circuits to correctly operate the equipment.
In industries for fine speed control dc motors are employed. However modern ac variable speed drives are replacing the conventional dc drives because of the following advantages:
Advantages of Variable Speed Drives:
Disadvantages of Variable Speed Drives:
Applications of Variable Speed Drives includes Fans, Conveyors, Compressors, pumps and Crushers for energy savings and better control
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