Research on Sensorless Heavy-Load Startup Method for Subsea Long-Cable-Fed PMSM

ZHAO Xinyu; DONG Hang; YANG Rui; LI Ming

doi:10.11993/j.issn.2096-3920.2026-0046

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ZHAO Xinyu, DONG Hang, YANG Rui, LI Ming. Research on Sensorless Heavy-Load Startup Method for Subsea Long-Cable-Fed PMSM[J]. Journal of Unmanned Undersea Systems. doi: 10.11993/j.issn.2096-3920.2026-0046

Citation:

ZHAO Xinyu, DONG Hang, YANG Rui, LI Ming. Research on Sensorless Heavy-Load Startup Method for Subsea Long-Cable-Fed PMSM[J]. Journal of Unmanned Undersea Systems. doi: 10.11993/j.issn.2096-3920.2026-0046

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Research on Sensorless Heavy-Load Startup Method for Subsea Long-Cable-Fed PMSM

doi: 10.11993/j.issn.2096-3920.2026-0046

College of Engineer, Ocean University of China, Qingdao 266500, China

Received Date: 2026-03-05
Accepted Date: 2026-04-24
Rev Recd Date: 2026-04-21

Available Online: 2026-09-22

Abstract

Abstract

To address the challenges of heavy-load startup and smooth transition in subsea permanent magnet synchronous motors driven by surface vessels via long umbilical cables, this paper proposes a novel sensorless control scheme based on motor-side rotor position estimation and a three-stage smooth transition strategy. First, a distributed architecture comprising "subsea observation and surface control" is constructed. This architecture effectively mitigates the distortion in current and voltage sampling, thereby enhancing the accuracy of rotor position estimation. Second, a three-stage startup method is designed, encompassing I-f open-loop acceleration, given reference frame pre-synchronization, and online compensation of closed-loop errors. Simulation results indicate that the proposed strategy significantly outperforms the conventional two-stage switching method during the handover from open-loop I-f control to closed-loop speed control. Specifically, under heavy load conditions, the peak speed oscillation and the q-axis current ripple amplitude are mitigated by approximately 83.7% and 88.5%, respectively. Consequently, the starting stability under long-cable and heavy-load conditions is markedly improved, further bolstering system reliability and robustness.
- sensorless control,
- I-f startup,
- long-cable-fed,
- smooth transition

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References(18)

References

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