A Space Vector Classification Technique for MEMS Electrostatic Six-Phase Induction Micro-motors

Micro-motors have found several applications in miniaturized pumps, compressors, fans, coolers, and turbo-generators. A six-phase inverter capable of generating precise waveforms at hundreds of kilohertz to a few megahertz frequencies and hundreds of volts is needed for such micro-motors, which requires a simple and fast modulation technique. This paper presents a novel approach to the implementation of the space vector modulation (SVM) of six-phase voltage source inverters. The proposed technique takes advantage of a modified Kohonen´s competitive layer to calculate the on duration of the adjacent switching state vectors. By using this technique: a) the hardware and software complexity of the system is reduced, b) the maximum attainable switching frequency and thus the bandwidth of the control system is increased, and c) the waveform degradation and parasitic harmonics resulting from inaccurate calculations are avoided. The proposed method is compared to the conventional implementations of SVM techniques in terms of hardware/software requirements, switching frequency, computation time, and harmonic spectra. Simulation results verify the validity of the proposed scheme