Abstract
Influence and compensation of the stator flux on the direct flux control sensorless technique for PMSMs
Highlights
Synchronous machines (SMs) have found wide application in several fields, such as industrial, automotive, domestic
direct flux control (DFC) is an injection technique, its conditions of applicability are strongly different from the ones of high frequency injection (HFI) methods since the zero-sequence voltage is modulated differently with respect to the electrical rotor position than the stator reference currents that are exploited by HFI techniques
The influence of stator currents on the estimated rotor position obtained with the DFC technique has been analysed
Summary
Synchronous machines (SMs) have found wide application in several fields, such as industrial, automotive, domestic. A different approach still based on the machine neutral voltage was published in [19] that allowed the development of a technique named direct flux control (DFC) This method obtains the anisotropy signals by evaluating the inductance variations of a star-connected PMSM by measuring the transients of the neutral-point voltage when the machine is excited by a particular PWM-pattern. The DFC technique has been successfully used in several practical applications such as the identification of electrical and mechanical parameters of PMSMs [31] and the observation of the external load torque using state observation techniques in [32] Besides this technique, another interesting approach was proposed by [33] that goes under the name of IVMS (induced voltage caused by magnetic saturation), that is capable of estimating the electrical rotor position by exciting two machine phases at a time and measuring the neutral point voltage. In order to validate the proposed model, experimental investigations have been carried out on a test PMSM and the obtained results are presented and discussed
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