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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.
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Gule et al. (2012) studied this question.
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