Phase Compensation Factor-Based Low Frequency Crossing for Sensorless Induction Motor Drives With Changing Loads

This article deals with speed observation methods for sensorless induction motor drives (SIMD). The speed observability of SIMD near zero stator frequency is a well-known concern. Using adaptive magnetizing current, existing methods are capable of crossing the zero-stator-frequency line, but still l...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2023-09, Vol.38 (9), p.1-11
Main Authors: Li, Ruhan, Yang, Kai, Luo, Cheng, Wang, Yi, Qiu, Lingfeng
Format: Article
Language:English
Subjects:
Compensation
Induction motor
Induction motors
Load fluctuation
Low frequencies
low frequency crossing method
Magnetic flux
Observability
Observers
Overcurrent
Parameter robustness
phase compensation factor
Rotors
sensorless control
Speed limits
Stability criteria
Stators
Torque
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Summary:This article deals with speed observation methods for sensorless induction motor drives (SIMD). The speed observability of SIMD near zero stator frequency is a well-known concern. Using adaptive magnetizing current, existing methods are capable of crossing the zero-stator-frequency line, but still limited to constant load conditions. To solve these problems, this paper presents a phase compensation factor-based low frequency crossing method with changing loads (PCF-LFCCL) to realize low frequency crossing process with decreased overcurrent and speed spikes. Firstly, the influence of load variations is studied finely, the LFCCL method is proposed with adaptive magnetizing current. Secondly, the torque output capacity analysis is given and illustrated. On this basis, the synchronous speed limit can be adopted properly. Thirdly, a generalized current model is developed for SIMD. The model reveals the phase delay phenomenon between magnetizing current reference and actual torque current, which can lead to speed spikes and overcurrent. To address this issue, a phase compensation factor (PCF) based method is developed by reconstructing compensation values to correct the torque current. Finally, comparative experiments are presented to validate the PCF-LFCCL method, including stator resistance error test for parameter robustness.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2023.3280486