On the T. D. Squirrel Cage Induction Motor

Abstract

In Electrical World page 732. No. 15. Vol. 78. 1921., Mr. J. W. Murry has publ shed very interesting paper on "Starting an induction motor without compensator" that is to connect a stator winding in extended delta at starting and reconnect the winding in delta when the motor reach is its full speed. I have invented myself the same starting device for the squirrel cage induction motor, three yeas ago, in 1918 and patented in Japan, and already hundreds of the patent motors are in market under the commercial name "T. D. Motor". The auther explains here the details of his invension and general theory of this starting device, and finally few experimental results and construction of the "T. D." Motor.