From a design standpoint, it is most desirable to operate all motors within a plant at full rated speed. Due to product considerations, however, there are many applications requiring variable speed operation. When a process requires the quality of speed variability, variable speed control is necessary.
The most common types of variable speed controls in the process industry today are: eddy current clutches, hydraulic couplings, variable pitch sheaves, DC solid state controls, AC variable frequency drives, and control valves. The type of variable speed control finally selected depends on the initial cost, application parameters, and environmental operating characteristics.
And Furthermore . . .
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