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http://dx.doi.org/10.5762/KAIS.2018.19.3.104

Sensorless Speed Control of PMSM for Driving Air Compressor with Position Error Compensator  

Kim, Youn-Hyun (Department of Electrical Engineering, Hanbat University)
Kim, Sol (Department of Electrical Engineering, Yuhan University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.19, no.3, 2018 , pp. 104-111 More about this Journal
Abstract
The sensorless control of high efficiency air compressors using a permanent magnet type synchronous motor as an oil-free air compressor is quite common. However, due to the nature of the air compressor, it is difficult to install a position sensor. In order to control the permanent magnet type synchronous motor at variable speed, the inclusion of a position sensor to grasp the position of the rotor is essential. Therefore, in order to achieve sensorless control, it is essential to use a permanent magnet type synchronous motor in the compressor. The position estimation method based on the back electromotive force, which is widely used as the sensorless control method, has a limitation in that position errors occur due either to the phase delay caused by the use of a stationary coordinate system or to the estimated back electromotive force in the transient state caused by the use of a synchronous coordinate system. Therefore, in this paper, we propose a method of estimating the position and velocity using a rotation angle tracking observer and reducing the speed ripple through a disturbance observer. An experimental apparatus was constructed using Freescale's MPU and the feasibility of the proposed algorithm was examined. It was confirmed that even if a position error occurs at a certain point in time, the position correction value converges to the actual vector position when the position error value is found.
Keywords
Back-EMF; Observer; Oil-free Air Compressor; PMSM; Sensorless control;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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