Source
Journal of Engineering Research, v. 21, no. 2, p. 163-172 .
English abstract
An interior Permanent magnet synchronous motor (IPMSM) drive employing sensorless control
strategies offers to simplify the design of servo systems, reduce costs, and improve reliability, thus attracting
significant research attention from both academic and industrial sectors for decades. The straightforward
configuration and decreased application prerequisites make model-based sensorless control approaches highly
popular. Notably, the conventional first-order integrator flux observer technique exhibits remarkable robustness
owing to its minimal reliance on motor parameters. However, the conventional first-order integrator experiences a
DC drift and harmonics in the estimated rotor flux as a result of non-ideal factors, such as detection errors, integral
initial value, converter nonlinearities, and parameter mismatches. In this paper, an improved ADRC-based integral
flux observer capable of eliminating drift is developed to achieve high-accuracy flux estimation. The efficiency of the
proposed technique in eliminating the drift from the estimated flux, as evidenced by theoretical analysis, has no
detrimental effect on the amplitude or phase angle of the fundamental waveform. The validity of the proposed
improved ADRC-based integral flux observer is verified by sensorless vector control of a 7.5 [kW] three-phase IPMSM
motor via extensive numerical simulation.
