Abstract
Low-speed sensorless control of Permanent Magnet Synchronous Machine (PMSM) faces an intrinsic problem of increased position estimation error with increased load. This phenomenon is due to changed magnetic saliency caused by the load current on the machine side. Therefore, such position estimation error, which deteriorates the drive performance, cannot be corrected by the sensorless algorithm itself; it has to be detected/compensated by other methods. In this article, an on-line identification method is proposed to detect reliably this load current dependent position estimation error. The unique features of the proposed method are its easy implementation and plug-and-play capability, without the needs of machine detailed flux map or extra devices such as a rotor locker; the detection process is very fast, so even with the q-axis current present, it will not cause noticeable rotor position change. Various experimental results are presented to validate the effectiveness of the proposed method.
Highlights
Permanent Magnet Synchronous Machine (PMSM) has been widely used in modern adjustable speed drives due to its well-known advantages of high efficiency, compact size and high torque density [1]
Position observers are normally divided into two categories for operations at medium-high speed range and at zero-low speed range respectively [2]
For medium-high speed range operation, position observers often utilize the fundamental model of the PMSM
Summary
PMSM has been widely used in modern adjustable speed drives due to its well-known advantages of high efficiency, compact size and high torque density [1]. In order to achieve satisfactory sensorless control performance, identification and compensation of the load current dependent position estimation error are needed [28].
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