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A scheme of a model reference adaptive system (MRAS) based on the theory of parameter optimization for the PMSM servo system is described in this paper. The scheme can promptly work out the speed of the rotor without any other position/speed sensor. Different from the other MRAS-based speed observers which constructed according the theory of stability(More)
Nineteen new derivatives of the naturally occurring compound, goniothalamin, were prepared by chemical modification and semi-synthetic methods. The antitumor activities of these derivatives and goniothalamin were evaluated in vitro against human tumor cell lines, and most of them showed an inhibitory effect against HL-60 cancer cells. The derivatives(More)
The sliding model speed observer proposed in this paper can work out the rotor angular speed reliably and perform well both at high speed and low speed with less steady state error by using a distinct sliding hyper plane which actually contains a PI controller. Through broadening the condition of the Lyapunov's stability theory reasonably and skillfully,(More)
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