Abstract
This paper proposes an optimized flux weakening (FW) control strategy for interior permanent-magnet synchronous electric motor to address the critical issues that could occur under torque setpoint transition in flux weakening region, due, for example, to an emergency braking. This situation is typical in electric vehicles where the electrical machines operate over a wide speed range to reach high power density and avoid gearboxes. Two modified traditional flux weakening strategies are proposed in this paper to improve torque control quality during high speed torque transition. The proposed modified control strategies were validated both by Matlab/Simulink simulations, modeling the power train of a light vehicle application, and extensive experimental tests on a dedicated test bench.
Highlights
In electric vehicle applications, interior permanent magnet synchronous machine is the most common motor topology for electric power train thanks to its inherently high torque density and high flux weakening capability [1]
From a general point of view it is possible to identify two operating regions for the power train: the constant torque region where the maximum torque per ampere (MTPA) strategy is adopted to minimize the Joule losses and the constant power region, where the motor operates under flux weakening (FW) control strategy to comply with voltage limit
This paper proposes different improved control strategies for flux weakening operation of IPM synchronous machines
Summary
Interior permanent magnet synchronous machine is the most common motor topology for electric power train thanks to its inherently high torque density and high flux weakening capability [1]. The flux weakening capability is a key issue when the vehicle power train layout does not include a gearbox. From a general point of view it is possible to identify two operating regions for the power train: the constant torque region where the maximum torque per ampere (MTPA) strategy is adopted to minimize the Joule losses and the constant power region, where the motor operates under flux weakening (FW) control strategy to comply with voltage limit.
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