Variable-Voltage Oil Well Drilling Equipment Comparison of Characteristics of Various Combinations of Motors and Generators

In the past, there have been many operating data taken and used in the comparison of the characteristics of various types of prime movers. However, there has never been a method established for the comparison of these equipments on a common basis. In this paper, such a method has been proposed. Although it deals only with internal combustion engine direct-current electric drives, with varying electrical characteristics, this method may be advantageously used for the comparison of other types of prime movers.