Abstract
For sensorless control of surface-mounted permanent magnet synchronous machines (SPMSMs), the major issue is in zero- and low-speed ranges. Since back-electromotive force (EMF) is proportional to speed, back-EMF based methods fail at zero and low speed. A solution considering the starting process and low speed sensorless control is presented. A simplified fundamental model-based method is proposed. Based on the simplified model, the measured stator currents in the stationary reference frame can be directly utilised for position estimation so that the sensorless control performance at low speed and starting is improved. Moreover, with the knowledge of rotor initial position sector information, a stable and reliable starting performance is achieved with the proposed method. The effectiveness of the proposed method is verified through experimental results.
Highlights
In recent years, permanent magnet synchronous machines (PMSMs) are increasingly used in various applications due to their high torque density, power density and efficiency
The magnitude of back‐electromotive force (EMF) is proportional to the rotor speed, these methods present poor performance and cannot be employed in the zero‐ and low‐speed range, whereas saliency tracking‐based methods are more suitable in the zero‐ and low‐speed range
For the proposed method, zero‐speed rotor position estimation is unfeasible, it is still possible to start the machine as long as the observer can quickly converge to the actual position after an initial rotation movement is seen without the knowledge of rotor initial position information, the starting performance may not be satisfactory and become even worse, for example reverse rotation issue [11,25], which is not allowed by some applications
Summary
Permanent magnet synchronous machines (PMSMs) are increasingly used in various applications due to their high torque density, power density and efficiency. Fundamental model‐based methods utilising back‐electromotive force (EMF) or flux‐ linkage have a good performance at middle and high speeds. The magnitude of back‐EMF is proportional to the rotor speed, these methods present poor performance and cannot be employed in the zero‐ and low‐speed range, whereas saliency tracking‐based methods are more suitable in the zero‐ and low‐speed range. Saliency tracking‐based methods may not be employed for the SPMSM It is still a challenge for sensorless control of SPMSM at zero and low speed
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