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Single Current Regulator Flux-Weakening Control of PMSM Based on Current Cross-Coupling Effect
Pages: 140-147
Year: Issue:  2
Journal: Transactions of China Electrotechnical Society

Keyword:  PMSMflux-weakening controlcurrent cross-couplingsingle current regulatorq-axis voltage;
Abstract: Single current regulator flux-weakening control based on the d-q current crosscoupling effect is a novel strategy for PMSM(permanent magnet synchronous motor). This fluxweakening strategy can solve the problem that two current regulators of traditional algorithms conflict with each other in high speed operation region and lead to poor system performance. Q-axis voltage given scheme is a key issue of this method, which influences PMSM’s voltage utilization ratio,efficiency and load capability. Based on voltage equation of PMSM, this paper describes the basic principle of flux-weakening control based on the d-q current cross-coupling effect and presents a modified control method. The disadvantages of existing control methods and the expected results of the proposed control method are analyzed by using stator current trajectory in id-iq coordinate plane.Dynamic control process is analyzed in the range of small signal. The modified control method can adjust q-axis voltage to motor operating condition. It does not depend on motor parameters or look-up table, and is easy to achieve. This method is verified by the results of simulation and experiment.
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