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Flux Weakening Control Technique without Look-Up Tables for SynRMs Based on Flux Saturation Models

Title
Flux Weakening Control Technique without Look-Up Tables for SynRMs Based on Flux Saturation Models
Author
윤영두
Keywords
synchronous reluctance motor (SynRM); flux weakening control; flux saturation; flux weakening region; dynamic inductance; apparent inductance; cross-coupling
Issue Date
2020-02
Publisher
MDPI
Citation
ELECTRONICS, v. 9, no. 2, article no. 218
Abstract
This paper presents a flux weakening algorithm for synchronous reluctance motors (SynRMs) based on parameters estimated at standstill. Recently, flux saturated motors have been studied. Flux saturation models were identified and look-up tables were generated based on the saturation model for maximum torque per ampere (MTPA) and flux weakening operations. The operation with tables would degrade the accuracy of operating points when the table size is not enough. The proposed method implements a flux weakening operation without tables, and the operating points are determined with voltages and currents on operating points. Therefore, the accuracy can be maintained. In addition, the computation time to generate the tables is not needed, so the initial commissioning process can be reduced. The proposed method consists of two parts: the determination of a flux weakening region and the modification of current references. The flux weakening region is determined by the angle between direction vectors along the constant torque and voltage decreasing directions in the d-q axis current plane. After identifying the flux weakening region, the current references are modified for flux weakening according to the direction vector and appropriate magnitude. The direction and magnitude are determined by the operating point of the currents and magnitude of the output voltage, respectively. Using the flux saturation model for SynRMs, the flux weakening direction can be determined accurately. As a result, flux weakening can be performed precisely. The experimental results prove the validity of the proposed method.
URI
https://www.mdpi.com/2079-9292/9/2/218https://repository.hanyang.ac.kr/handle/20.500.11754/158885
ISSN
2079-9292
DOI
10.3390/electronics9020218
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > AUTOMOTIVE ENGINEERING(미래자동차공학과) > Articles
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