An electric motor thermal management system for hybrid vehicles: modelling and control
by Xinran (William) Tao; Kan Zhou; John R. Wagner; Heath Hofmann
International Journal of Vehicle Performance (IJVP), Vol. 2, No. 3, 2016

Abstract: The HEV e-motor's internal temperature significantly influences its torque/power capabilities. The dominant heat sources are located within the e-motor stator windings and create 'hot spots'. To keep the motor functioning properly without exceeding the established temperature limits, a new cooling concept for PM e-motors featuring advanced controllers is proposed. Firstly, a reduced-order finite element model describes the e-motor's thermal behaviour. Next, an optimal regulator calculates the ideal (target) heat removal rate at its cooling surface. Lastly, a nonlinear tracking controller governs the cooling system operation. Numerical simulation has been conducted to validate the cooling concept. In the urban assault cycle, the stator hot-spot temperature is stabilized with an average error of 0.13°C and a 68% power consumption reduction achieved when compared to classical control. Similarly, the cooling system power consumption is reduced by 28.9% with the proposed controllers for the convoy escort driving cycle.

Online publication date: Tue, 23-Aug-2016

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