Dwubiegowy silnik indukcyjny o stosunku prędkości obrotowych 1:3

This paper describes a new concept of using conventional induction motor as a two speed induction motor. By switching supply from three phase to single phase with all windings connected in series it is possible to triple magnetic pole number. There are shown basic properties of such a solution. Results of FEM calculation including flux pattern and normal component of flux density along an airgap are presented. Torque-speed and current-speed characteristic of studied motor are also presented. Some transients including torque, speed and current versus time during start up and switching to single phase supply are shown.