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Synchronous machines with surface mounted permanent magnets (SMPMSMs) are very popular in industry due to their high efficiency and simple design and are therefore of special interest for position sensorless control. These types of machines typically have small inherent saliencies resulting in a low signal to noise ratio when measuring the rotor position using injected high frequency test signals...
In this paper, we investigate position sensorless control technique for the permanent magnet synchronous motor (PMSM). We observed that when the current flows along the magnetic axis, there is variation of the current response caused by the magnetic saturation of the stator core of the PMSM. Based on the variation, we proposed a method of inspecting the PMSM rotor position at the standstill and a...
The paper deals with the sensorless control of salient-pole Permanent Magnet (PM) synchronous motor drives, using a high frequency injected voltage for estimating the electrical angular position of the rotor. A high frequency speed-dependent ellipse rotating voltage vector is injected to the motor. It generates a high frequency current vector in the estimated synchronous reference frame, that contains...
In this paper, an accurate method for sensorless control of permanent magnet brushless motors is explained. The method doesn't include any modification to the classical construction of such motors and can be easily integrated within the drive electronics. It is applicable to both motor types, i.e. those with sinusoidal or trapezoidal back EMF.. The back EMF waveform is extracted on-line using simple...
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...
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