A New Position-Estimated Algorithm of PMLSM Sensorless Driving System in Full Scope of Speed

Abstract:

Considering the issue that it is difficult to precisely extract the rotor information within the full scope of speed for PMLSM sensorless driving system,this paper proposes a convenient position estimation algorithm based on a new type of closed-loop observer to adapt the characteristics of wide range of linear motor speed variation.To accurately estimate the rotor position information for PMLSM system with speed varying from launching to full speed,the new algorithm is like following: based on the three-phase stationary coordinate system of PMLSM voltage model, deduce quadrature-axis current differential equations from its rotating coordinate system(d-q axis)voltage model through by Parker transformed. moreover,get the actual alternating axis current by current measuring circuit. By driving a closed-loop observer through difference between the two current differential to input and process the difference of magnetic polo position by PI algorithm, then estimate the position of the motor.Simulation results show that the convenient algorithm with position closed-loop observer can estimate the location of the motor relatively accurately in full range of speed.

• Periodical: Applied Mechanics and Materials (Volumes 635-637)
• Pages: 1412-1417
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.635-637.1412
• Online since: September 2014
• Authors: Gui Rong Wang, Zhi Hong Zhao*
• Keywords: PMLSM, Position-Observer, Sensorless

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