Full-speed domain position sensorless control strategy for PMSM based on improved super-twisting sliding-mode observer and smooth transition optimization
Xia Zhang, Pengwei Li, Bo Wang, Minghao Lv, Liangtong Shi
TL;DR
This paper introduces a sensorless control strategy for PMSMs that enables smooth operation across all speed ranges using improved observers and signal injection techniques.
Contribution
A full-speed control algorithm combining improved super-twisting sliding-mode observers and high-frequency signal injection for smooth motor transitions.
Findings
The improved STSMO method achieves rotor position estimation errors of approximately 0.2 rad.
The Sine-weighted switching function enables smooth transitions from low to medium–high speeds.
Simulation results validate the effectiveness and superiority of the proposed control strategy.
Abstract
In the sensorless control of permanent magnet synchronous motors (PMSMs), achieving smooth transitions from low to medium–high speeds remains a significant challenge. Aiming at the problem that PMSMs cannot be smoothly transitioned to medium–high speed range, this paper proposes a full-speed range control algorithm based on the fusion of pulsating high-frequency injection (HFI) with square waves and an improved super-twisting sliding-mode observer (STSMO). The proposed method enables smooth and stable operation over the full speed range, with notable improvements observed during transitional phases. In the low-speed range, high-frequency current signal is obtained by injecting a high-frequency (HF) square-wave signal, and the signal is processed to obtain rotor position and speed information. For medium–high speeds, a variable-gain linear STSMO (VGLSTSMO) combined with an adaptive back…
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Taxonomy
TopicsSensorless Control of Electric Motors · Electric Motor Design and Analysis · Magnetic Bearings and Levitation Dynamics