On the Starting of Three Phase Induetion Motor with Cage Rotor

Abstract

In the three phase induction motor with squirrel cage rotor, the problem to increase the starting torque, or to suppress the heavy starting current, have been considered and intended to solve from years in many different ways. Here, the classifications and the tabulations of these different intensions are given with brief discussions of each of them, and also with the explanations of their specialities for the commercial uses. Especially, on the double cage rotor, a sort of theoretical treatments, test results, and the analysis of its characteristics are geven, calling attensions upon its utirizations on some of the ranges of induction motor drives. Finally, the future developments of these types of motors are suggested with also a discussion of character influenced by the material of end ring.