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Research on Full-Speed-Range Sensorless Control of Permanent Magnet Synchronous Motors
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Journal Article
Research on Full-Speed-Range Sensorless Control of Permanent Magnet Synchronous Motors
2026
Overview
To achieve high-precision sensorless control of PMSMs over the full speed band, a novel hybrid strategy is presented in this work that combines HFI with an improved rotor-flux-based SMO. At zero/low speeds, a pulsating high-frequency square-wave signal is injected. The high-frequency current response is separated from the fundamental component through algebraic operations, avoiding the phase delay of conventional filters and improving the accuracy and dynamics of position estimation. In medium and high speed range, an improved SMO on the basis of the rotor flux model is adopted to suppress chattering. A weighted function ensures smooth switching between the two methods, enabling seamless full-speed-range sensorless control. Simulations under typical conditions—loaded start-up, full-speed operation, and restart with residual speed—verify that the proposed algorithm provides stable and robust motor operation with excellent dynamic capabilities.
Publisher
IOP Publishing
Subject
