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A novel variable-frequency three-phase induction motor drive system using only three controlled switches

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2 Author(s)
Welchko, B.A. ; Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA ; Lipo, T.A.

This paper presents a novel variable-frequency motor drive system for a three-phase induction machine. In this drive system, the machine is excited by unidirectional stator currents shaped and sequenced such that a rotating air-gap flux is induced so that the machine can operate. Due to the unidirectional nature of the currents, an "inverter" that incorporates only three active, insulated-gate-bipolar-transistor-type switches, and three freewheeling diodes can synthesize them. The drive system requires an asymmetric induction machine that can easily be obtained by externally rewiring a motor with a dual-wound stator. The inverter is supplied by a single-phase input via a voltage-doubler diode rectifier; hence, it can be operated with residential service. In this paper, theoretical control methods are presented and both simulation and experimental results are provided proving the validity of the proposed drive system

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Industry Applications, IEEE Transactions on  (Volume:37 ,  Issue: 6 )