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This paper introduces two torque ripple suppression control methods for permanent magnet synchronous motor. With a system identification technique, the system model from compensating current input to torque detection output can be expressed as the speed-adjustable 1-dimension complex vector in the coordinate system synchronizing with the torque ripple frequency. The first method introduces a periodic...
We have developed a circuit for determining an optimal supply voltage, VOPT, for which energy consumption will be minimized in devices suffering from high-leakage. This VOPT is determined on the basis of a trade-off between power consumption and operation time. Experimental results with a 90-nm CMOS device indicate that the proposed circuit successfully determines VOPT with high accuracy. VOPT operations...
A 125 MHz 1 GIPS at 1.3 V 1 W microprocessor with single-chip tightly-coupled multiprocessor architecture and low-voltage circuits is targeted to high-performance and low-power embedded systems, especially smart information terminals. This paper shows an entire chip diagram integrating four tightly-coupled processors. Each processing element (PE) is in-order two-way issue superscalar with two ALU...
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