An estimation method of starting performance of squirrel-cage induction motor on DC decay testing method

In this paper, the authors propose a new method to calculate the starting performance of a squirrel cage induction motor by standstill tests using a small-capacity DC power supply. In this method, DC current is first made to flow through the armature winding (two terminals with the third one open). Then the current decay caused by short-circuiting the two phases is recorded. The operational impedance of the induction motor per phase is determined by Fourier transformation of the current decay. The starting performance is obtained by the two reaction theory. Experimental results clearly show that this method is useful for estimating starting performance.