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A fabrication-tolerant polarization beam splitter (PBS) based on grating-assisted contradirectional couplers is experimentally demonstrated. Over 30-dB extinction ratios are achieved for both polarizations. Large fabrication tolerance in coupling length is also verified.
The performance of direct torque control (DTC) based on space vector modulation (SVM) for permanent magnet synchronous motor (PMSM) of artillery speed servo system is researched in this paper. The PMSM of artillery speed servo system has small stator inductance and permanent magnet flux linkage, so high sampling interval is needed to reduce torque ripples when using classical DTC scheme. A SVM-based...
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