Regression Analysis of the Correlation Between the Power Factor of the Motor and the Frequency of the Frequency convertor in an Oil Transportation System

Usurally, the speed of the motor used in an oil transportation system is adjustable, the frequency of frequency convertor is also variable, and the power factor of the motor varies with the frequency. So it is important to know the interrelationship between the power factor and the frequcncy.In this paper,the regressive curve of the interrelationship was obtained based on the data of the power factor from five motors working at five different frequencies separately. When the frequency is known, the power factor can be gained from the relationship. The power factor can be controlled under meeting the requirements of oil transportation system.