Correction coefficient is important to electric charge refund, but its powerfactorAngle is unknown.
更正系数是补退电费的重要依据,但更正系数中的功率因数角也是未知数。
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As for the problem the high current and the vibration of the torque, the double closed loops which include the current and powerfactorAngle are worked out.
Elements that affect the output powerfactorAngle are analyzed, the basic principle of constant powerfactorAngle control is studied and its realization scheme is presented.