All-digital hardware flux linkage sliding mode observer

By using a dual-clock domain heterogeneous processing architecture and hardware logic circuits, the problem of capturing the nonlinear characteristics of inverters in existing technologies has been solved, enabling high-frequency observation and accurate calculation of rotor position of permanent magnet synchronous motors, thereby improving the steady-state accuracy and dynamic response of the control system.

CN122203884APending Publication Date: 2026-06-12TANGSHAN HENGDING TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TANGSHAN HENGDING TECH CO LTD
Filing Date
2026-03-23
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

Existing sensorless control technology for permanent magnet synchronous motors relies on software algorithms, which makes it difficult to capture the nonlinear characteristics of the inverter on a nanosecond time scale. This leads to model mismatch errors and insufficient dynamic response, affecting the steady-state accuracy and dynamic tracking capability of the control system.

⚗Method used

A dual-clock domain heterogeneous processing architecture is adopted, which combines nanosecond-level voltage vector reconstruction logic, a switching density monitor, and an integral-reset algebraic reconstruction unit. The parallel processing of high-frequency observation and low-frequency control is realized through hardware logic circuits. The rotor position is calculated using a vector cross-product type hardware phase-locked loop, avoiding the phase delay and complex calculations of traditional filters.

🎯Benefits of technology

It achieves accurate reproduction of the inverter output voltage waveform and accurate observation of the stator flux linkage, improves the observation frequency, reduces the chattering amplitude, and ensures stable output and dynamic response of rotor position and speed information across the entire speed range.

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Abstract

The application discloses a full-digital hardware flux linkage sliding mode observer, and relates to the technical field of motor control. The observer adopts a dual-clock domain heterogeneous architecture, including a fast observation domain processing module based on a high-frequency observation clock and a slow control domain processing module based on a low-frequency control clock. The fast observation domain processes the inverter dead-time effect by using a nanosecond-level voltage reconstruction logic, realizes adaptive adjustment of the sliding mode gain through a switching density monitor, and performs linear mean value extraction across the clock domain by using an integral reset type algebraic reconstruction unit. The slow control domain integrates a vector cross-multiplication type hardware phase-locked loop, and solves the rotor position by using amplitude normalization logic and register overflow characteristics. The application significantly improves the observation bandwidth by using pure hardware logic circuits, eliminates the phase lag of the traditional filter, and realizes high-dynamic and high-precision sensorless control in the full-speed domain working condition.
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