Control of micro- and mini-scale synchronous reluctance motors modeled using machine and arbitrary variables

Abstract

In this paper we address and solve a spectrum of problems in analysis, modeling, and control of micro- and mini-scale synchronous reluctance machines fabricated using CMOS micromachining technologies. All electromechanical motion devices must be thoroughly analyzed before attempting to control them because electromagnetic features in energy conversion significantly restrict the control algorithms to be applied. This is of particular significance to synchronous reluctance motors which are simple to fabricate, but difficult to control. This paper illustrates that depending upon the analysis of synchronous reluctance machines, totally different control laws must be designed because AC and DC voltages must be applied if one uses the machine and arbitrary reference frames. However, using the model conversions applying the Park transformation, the controller efficiency is proven. It is illustrated that electromagnetic features, saturation effect, and parameters variations do not allow one to use feedback linearization. Furthermore, synchronous machines are open-loop stable, and there does not exist a need to cancel the stabilizing nonlinearities. The fundamental, applied, and experimental results reported illustrate the validity and effectiveness of the reported results. Microscale synchronous reluctance motors are studied. The motor parameters are: 1000 rad/sec, 1.5/spl times/10/sup -9/ N-m, 1 V, 0.0001 A. This motor is controlled by high-switching-frequency power converters. The high-performance microdrives can be used in diesels.