A NEW COMMUTATING METHOD FOR CHANGE POLE TO ELECTRIC MACHINE –2△/3△-CHANGE-POLE

In this paper ,the limit use of 3Y/3Y change-pol is analyzed, then a new commutating method for change pole t variable-pole machine-2?/3? -change-pole is presented, an its commutating principle is discuussed. The presented metho is used for some-wide-ratio change-pole machine superior t 3Y/3Y-change-pole. The distributions over 2?/3? -network o the inductive electromotive foce, load current, phase voltag and the excitation merging are anelyzed in the paper. Then tak the blast change-pole machine as example, the plan of 2?/3? change-pole and the plan of 3Y/3Y-change-pole are compare in the paper.