A novel Newton-Raphson-based searching method for the MTPA control of PMaSynRM considering magnetic and cross saturation

Wang, Shuo; Degano, Michele; Kang, Jinsong; Galassini, Alessandro; Gerada, Chris

Abstract

Maximum torque per ampere control (MTPA) takes full advantage of the reluctance torque aiming at the minimum copper loss, which can increase the torque output under the minimum current conditions. The traditional MTPA method makes use of equations with constant inductance values which are implemented as look-up tables. However, the inductances of the motor present both magnetic saturation and cross-saturation characteristics. Those parameters are changing depending on the operating point. This paper presents a novel MTP A control strategy of permanent-magnet assisted synchronous reluctance motor (PMaSynRM) implementing a Newton-Raphson-Based Searching Method for improving the control accuracy for optimal current reference. The proposed method eliminates the need of fitting operations due to the nonlinearity of the MTP A formulation and takes the inductance variation, due to magnetic saturation, into account. Finally, the effectiveness of the proposed method is verified by means of Matlab/Simulink simulations.

Citation

Wang, S., Degano, M., Kang, J., Galassini, A., & Gerada, C. (2018). A novel Newton-Raphson-based searching method for the MTPA control of PMaSynRM considering magnetic and cross saturation. In Proceedings 2018 XIII International Conference on Electrical Machines (ICEM)doi:10.1109/icelmach.2018.8506853

• Conference Name: 2018 XIII International Conference on Electrical Machines (ICEM)
• Start Date: Sep 3, 2018
• End Date: Sep 6, 2018
• Acceptance Date: Jun 3, 2018
• Online Publication Date: Oct 25, 2018
• Publication Date: Sep 3, 2018
• Deposit Date: Nov 30, 2018
• Publicly Available Date: Dec 3, 2018
• Publisher: Institute of Electrical and Electronics Engineers
• Book Title: Proceedings 2018 XIII International Conference on Electrical Machines (ICEM)
• ISBN: 9781538624777
• DOI: https://doi.org/10.1109/icelmach.2018.8506853
• Keywords: PM assisted reluctance motor; MTPA control, Newton-Raphson Algorithm; Magnetic Saturation; Cross- Saturation
• Public URL: https://nottingham-repository.worktribe.com/output/1351480
• Publisher URL: https://ieeexplore.ieee.org/document/8506853
• Additional Information: © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.