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This paper focuses on the low speed performance of extended electromotive force (EMF) based position-sensorless speed control of surface permanent magnet synchronous motors (SPMSMs) in real-time. It is the first time Morimoto's extended EMF approach is applied to SPMSM and its low speed performance is evaluated by real-time experiments. The results obtained from the designed position-sensorless drive...
This paper proposes a new rotor position and speed estimation method for sensorless control of PMSM in high speed range. In order to improve the dynamic performance of conventional back-EMF methods, the proposed method eliminates the Phase-Lock Loop (PLL) while at the same time, avoids the potential local loop that might cause system unstable in closed-loop sensorless control. Instead of directly...
This paper presents a novel position and velocity estimation technique in four-phase switched reluctance drives based on high frequency signal injection methods. To estimate rotor position and velocity, an identical high frequency carrier voltage signal is superimposed on the main phase voltages and injected into the machine. As a result, the phase currents are composed of both main excitation currents...
This paper introduces a novel sensorless method for speed and position estimation of permanent magnet synchronous motor (PMSM). The mathematical model of PMSM is expressed in an arbitrary rotating reference frame and no knowledge of initial rotor position is needed. The developed algorithm is based on sliding mode observer (SMO) theory and consists of two discrete steps: flux/current and speed/position...
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