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Maximum Torque per Voltage Flux-Weakening Strategy With Speed Limiter for PMSM Drives.

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Title: Maximum Torque per Voltage Flux-Weakening Strategy With Speed Limiter for PMSM Drives.
Authors: Miguel-Espinar, Carlos1 carlos.miguel@upc.edu, Heredero-Peris, Daniel1 daniel.heredero@citcea.upc.edu, Gross, Gabriel1 gross@citcea.upc.edu, Llonch-Masachs, Marc1 marc.llonch@citcea.upc.edu, Montesinos-Miracle, Daniel1 montesinos@citcea.upc.edu
Source: IEEE Transactions on Industrial Electronics. Oct2021, Vol. 68 Issue 10, p9254-9264. 11p.
Subjects: Permanent magnet motors, Electromotive force, Voltage, Speed limits, Algorithms, Electric bicycles
Abstract: This article presents an enhanced flux weakening (FW) control scheme for permanent magnet synchronous motors, focused on electric vehicle applications. The novelty of the proposed algorithm is the integration in a unified scheme of both the accelerator pedal as torque reference and the cruise speed limiter as speed limit, without interfering between them until this limit is achieved. The dq-axis current references are calculated from the proposed algorithm by using a polar coordinate system and a per-unit system. The latter is based on the characteristic machine parameters, which aim to ease and simplify the algorithm implementation. Moreover, it takes advantage of the smooth transition between the low back electromotive force zone and the FW zone thanks to a voltage loop, which changes the current-vector angle. Another fundamental merit of the proposed scheme is its capacity to work in all the dq plane throughout the maximum torque per ampere, constant torque, current and voltage limit, maximum torque per voltage, and constant speed strategies without switching the algorithm. Simulations and experimental results from a real exterior-rotor interior permanent magnet synchronous motor direct-drive e-motorbike verify the effectiveness of the proposed method. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:This article presents an enhanced flux weakening (FW) control scheme for permanent magnet synchronous motors, focused on electric vehicle applications. The novelty of the proposed algorithm is the integration in a unified scheme of both the accelerator pedal as torque reference and the cruise speed limiter as speed limit, without interfering between them until this limit is achieved. The dq-axis current references are calculated from the proposed algorithm by using a polar coordinate system and a per-unit system. The latter is based on the characteristic machine parameters, which aim to ease and simplify the algorithm implementation. Moreover, it takes advantage of the smooth transition between the low back electromotive force zone and the FW zone thanks to a voltage loop, which changes the current-vector angle. Another fundamental merit of the proposed scheme is its capacity to work in all the dq plane throughout the maximum torque per ampere, constant torque, current and voltage limit, maximum torque per voltage, and constant speed strategies without switching the algorithm. Simulations and experimental results from a real exterior-rotor interior permanent magnet synchronous motor direct-drive e-motorbike verify the effectiveness of the proposed method. [ABSTRACT FROM AUTHOR]
ISSN:02780046
DOI:10.1109/TIE.2020.3020029