Multiphase Cage-Rotor Induction-Machine Drive With Direct Implementation of Brush DC Operation

In this paper, a multiphase induction-machine drive utilizing the brush-dc-machine operation principle is presented and implemented on a cage-rotor multiphase induction machine. The results from measurements prove that the proposed brush dc control method for multiphase induction-machine drives produces remarkable results in the subbase and flux-weakening-speed regions of the drive. Also, results show that the drive system´s efficiency compares well with that of a standard three-phase drive system. The method can be used for any high-phase-number cage or wound-rotor induction machine.