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This paper proposes a novel smooth transition method, which can be applied to back electromotive force (BEMF)-based permanent magnet synchronous motors (PMSM) sensorless vector control drive. The problem with BEMF-based sensorless control of PMSM control is the inherent BEMF estimation precision before reaching a certain rotation velocity. A position open loop constant current (I-F) method, which...
A sensorless method named Direct Flux Control (DFC), which only requires the different voltages between a neutral point of permanent magnet synchronous machine (PMSM) and an artificial neutral point during switching states of pulse width modulation (PWM) signals, is implemented on a real time system with a PMSM. The DFC method is a continuous excitation method and can attain the estimated rotor position...
In this paper, a robust sensorless speed observer-controller scheme for a permanent magnet synchronous motor (PMSM) is proposed. To estimate both position and speed, without any mechanical sensors and only from the electrical measurements, a back-EMF-based sliding mode is designed. The convergence of this observer is proved. Then a high order sliding mode controller is developed. By using this technique,...
Sliding mode observer (SMO) for permanent magnet synchronous motor (PMSM) speed and rotor position is used to realize sensorless control. Most of the current researches studying the PMSM SMO are based on non-saliency PMSM model and ignore the difference between d- and q-axes inductances. This paper studies a novel SMO based on PMSM's extended EMF (EEMF) model, considering the saliency of PMSM. It...
In this paper, we propose an injection axis switching (IAS) sensorless control scheme using a pulsating high-frequency (HF) signal to minimize the position detection error and the velocity estimation ripple due to the zero current clamping (ZCC) effect for permanent magnet synchronous motors (PMSMs). When a pulsating carrier-signal voltage is injected in an estimated synchronous frame, the envelope...
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