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An Improved Speed Sensing Method for Drive Control.

Manuel R Arahal1, Manuel G Satué1, Juana M Martínez-Heredia2

  • 1Departamento de Ingeniería de Sistemas y Automática, Universidad de Sevilla, 41092 Seville, Spain.

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|January 25, 2025
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Summary
This summary is machine-generated.

This study introduces a novel speed sensing method for electrical drives, reducing feedback loop time lag and measurement fluctuations. The new approach uses a transient detector for improved variable-speed drive control performance.

Keywords:
induction motormulti-phase IMpredictive controlspeed sensing

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Area of Science:

  • Electrical Engineering
  • Control Systems
  • Motor Drives

Background:

  • Variable-speed electrical drive control commonly uses a two-loop system for torque/speed and stator current.
  • Accurate mechanical speed feedback is crucial for modern drive control loops.
  • Conventional speed sensing via incremental rotary encoders introduces time delays and measurement fluctuations.

Purpose of the Study:

  • To propose a new speed sensing method for electrical drives.
  • To reduce time lag and fluctuations in speed feedback without compromising accuracy.
  • To enhance the performance of variable-speed electrical drive control systems.

Main Methods:

  • A novel transient detector is employed to identify drive operational regimes (transient or stationary).
  • The detection mechanism directly analyzes incoming encoder pulse trains, not measured speeds.
  • The method is designed for compatibility with existing digital signal processor routines.

Main Results:

  • Experimental validation on a five-phase induction motor demonstrates reduced time lag in speed feedback.
  • The proposed method effectively minimizes speed measurement fluctuations.
  • Improved overall drive performance is observed due to enhanced speed feedback accuracy.

Conclusions:

  • The novel speed sensing method offers a significant improvement over traditional pulse counting techniques.
  • Reduced time lag and fluctuations lead to better phase margin and drive control.
  • This method provides a practical solution for enhancing electrical drive performance in real-world applications.