Original scientific paper
https://doi.org/10.30765/er.2103
Hybrid sensorless control of PMSM in full speed range using HFI and back-EMF
Slimane Medjmadj
; ETA Laboratory, Faculty of Sciences and Technology, University of Bordj Bou Arreridj, Algeria.
Abstract
The permanent magnet synchronous motors (PMSM) are more and more used because of their high performance compared with other AC motors. The present paper proposes a hybrid controller which consists of a high frequency injection estimator and a back-electromotive-force observer in full speed range for the sensorless control of PMSM. The aim objective of the study to prevent speed overshot in startup time of the motor and provides a better dynamic response in transient and permanent states using this structure. A hybrid algorithm is applied to realize a smooth transition from low to high speed. At standstill and very low speed region, HF injection technique is used to detect the rotor initial position. In this first step study, the position estimation is derived from a HF current injection by using only one filter. When the rotor speed goes up to a certain value where back-EMF can provide adequate information, a back-EMF observer will dominate. Thanks to this structure, the mechanical sensor can be engaged using the best estimates and the developed control method is fast, simple, and flexible. The effectiveness, superiority, and performance of the proposed control method and extensive simulation results are provided on a 1 kW permanent magnet synchronous motor drive, demonstrating the expected performances.
Keywords
back-EMF; PMSM; high frequency injection; hybrid controller
Hrčak ID:
301738
URI
Publication date:
14.3.2023.
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