誘導電動機の予備励磁式Y-Δ始動時における突入電流の理論的解析

概要

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Inrush current may sometimes be produced in the three phase induction motor at the time of Y-Δ starting. Authors have already proposed the new Y-Δ starting method which has been called three phase pre-excitation system. In this method, a control-resistance is interposed between the power supply and the stator winding of the induction motor. In this paper, the inrush current of the motor has been analyzed by instantaneous symmetrical coordinate method in order to-discuss the optimal control-resistance of the new Y-Δ starting unit. At the beginning of the analysis, saturation and other nonlinear effects are neglected, and an idealised induction motor is considered. A flow chart of the calculation method by computer is given for the numerical evaluation of the transient current and torque after the reconnection to the power supply. Comparison of measured and analyzed results shows that the idealizing assumption is certainly justified by the 5.5 kW induction motor tested.
明治大学の論文