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Nowadays, many efforts are made to realize the position/speed sensorless control strategy of permanent magnet synchronous motors (PMSM) to simplify the control structure and cut down the cost. A sensorless control scheme based on a model reference adaptive system (MRAS) with the theory of parameter optimization for the PMSM servo system is described in this paper. The scheme can promptly work out...
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, the proposed observer gets rid of the low pass...
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