Title :
A novel variable-frequency three-phase induction motor drive system using only three controlled switches
Author :
Welchko, Brian A. ; Lipo, Thomas A.
Author_Institution :
Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA
Abstract :
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
Keywords :
DC-AC power convertors; bipolar transistor switches; induction motor drives; insulated gate bipolar transistors; invertors; magnetic flux; power bipolar transistors; power semiconductor switches; stators; switching circuits; freewheeling diodes; insulated-gate-bipolar-transistor-type switches; power IGBT switches; residential service; rotating air-gap flux; single-phase input; unidirectional stator currents; variable-frequency motor drive system; voltage-doubler diode rectifier; Air gaps; Control system synthesis; Diodes; Induction machines; Induction motor drives; Insulation; Inverters; Motor drives; Stators; Switches;
Journal_Title :
Industry Applications, IEEE Transactions on
