[preprint for TechRxiv] review_sensorless.pdf (3.89 MB)

Overview of AC Motor Sensorless Algorithms: a Unified Perspective

Download (3.89 MB)
posted on 2021-09-30, 17:32 authored by Jiahao ChenJiahao Chen, Jie Mei, Yuefei Zuo, Jingwei Zhu, Xin Yuan, Christopher H. T. Lee
This paper reviews sensorless algorithms for both induction motors and permanent magnet motors using the active flux model, such that any design applicable for non-salient pole ac motors can also be included in the review framework. The proposed review framework classifies all sensorless algorithms following a five-layer hierarchy abbreviated as O-I-M-A-I, resulting in four main categories as i) inherently sensorless position estimation, ii) non-inherently sensorless position estimation, iii) post-position-estimation speed estimation, and iv) speed estimation for indirect field orientation. Various ac motor models are derived by assuming a constant active flux amplitude, based on which seven generic sensorless algorithms are summarized in a tutorial. Recommendations are made for sensorless drive designers to begin with inherently sensorless method such that the two-way coupling between position estimation and speed estimation is avoided. Finally, classical induction motor model results from time-varying active flux amplitude and slip relation, for which a state transformation is recommended for achieving global stability.




Email Address of Submitting Author

ORCID of Submitting Author


Submitting Author's Institution

Nanyang Technological University

Submitting Author's Country

  • Singapore