Generalized High-Frequency Injection Framework for Sensorless Control of Synchronous Reluctance Machines

Dmytro Prystupa, Xiaoyan Huang, He Zhang, Vasyl Varvolik, Giampaolo Buticchi, Shuo Wang, Xiaochen Zhang, Jing Li, Chris Gerada

Research output: Journal PublicationArticlepeer-review


The high-frequency injection (HFI) method is commonly used for sensorless control of synchronous reluctance motors (SynRMs) at low speeds. Injecting a high-frequency (HF) signal in a predefined direction, referred to as the d-axis, and further demodulating the excited signal in the q-axis are a popular sequence for SynRM position tracking. Injection in the q-axis is not usually considered due to its potential to increase torque ripple. This article proposes a generalized HF pulsating voltage injection approach for sensorless control of SynRM. This approach allows for the arbitrary selection of injection strategy and covers the injection and demodulation procedures in d- and q-axes in detail. Special attention is given to determining the amplitude of the injection voltage, which can extend the usage range of HFI and support sensorless control at high speeds. The effectiveness of the proposed structures is experimentally verified using 15 kW SynRM. During system validation, extra care is taken to investigate the overall system efficiency and vibration levels, including torque ripple issues. This solution contributes to the advancement of sensorless control for SynRM drives.

Original languageEnglish
Pages (from-to)304-315
Number of pages12
JournalIEEE Open Journal of the Industrial Electronics Society
Publication statusPublished - 2023


  • High-frequency injection (HFI)
  • motor efficiency
  • sensorless control
  • synchronous reluctance motor (SynRM)
  • torque control
  • variable frequency drives

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering


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