Journal
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
Volume 56, Issue 4, Pages 3846-3854Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIA.2020.2993525
Keywords
Saturation magnetization; Torque; Magnetic flux; Magnetic cores; Stator windings; Inductance; Maximum torque per ampere (MTPA); rotor-oriented control; synchronous reluctance motor (SynRM)
Funding
- Tecnologie ad alta efficienza per la sostenibilita energetica ed ambientale On-board (High efficiency technologies for on-board energy and environmental sustainability) [TESEO-CUP: B61C12000850005, PON02_00153_2939517]
- University of the South Pacific within the research project Advanced Control of Synchronous Reluctance Motors for Electrical Vehicles (ACOSREV)
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This article proposes an analytical formulation of a maximum torque per ampere (MTPA) technique, accounting for the magnetic saturation of the iron core, specifically developed for synchronous reluctance motors (SynRMs). The proposed MTPA is based on a magnetic saturation model of the SynRM, which has been obtained after simplifying a more complete magnetic model, including also cross-saturation effects. This simplified magnetic model, and consequently the proposed MTPA, can be easily parameterized directly starting from a unique set of tests for the off-line identification of the motor, without the need for any complex, time-consuming, and cumbersome finite-element analysis of the machine under test. The proposed MTPA has been tested experimentally on a suitably developed test set-up. Results obtained with the proposed MTPA have been compared experimentally with both the classic MTPA and the real MTPA. Results clearly show that the proposed technique permits a significant increase of the torque per ampere (TPA) with respect to the case of the classic MTPA, which does not consider magnetic saturation. TPA increase varies from 5% at 3 Nm load to 18% at 12 Nm load. Moreover, the loss of maximum torque, with respect to the real MTPA, obtained at the maximum speed and load torque with the proposed MTPA is about 15%, whereas the loss of maximum torque obtained with the classic MTPA is about 38.5%.
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