Abstract
This paper evaluates the electromagnetic and thermal performance of several traction motors for electric vehicles (EVs). Two different driving cycles are employed for the evaluation of the motors, one for urban and the other for highway driving. The electromagnetic performance to be assessed includes maximum motor torque output for vehicle acceleration and the flux weakening capability for wide operating range under current and voltage limits. Thermal analysis is performed to evaluate the health status of the magnets and windings for the prescribed driving cycles. Two types of traction motors are investigated: two interior permanent magnet motors and one permanent magnet-assisted synchronous reluctance motor. The analysis results demonstrate the benefits and disadvantages of these motors for EV traction and provide suggestions for traction motor design. Finally, experiments are conducted to validate the analysis.
Highlights
Electric vehicles (EVs) have become more and more attractive in recent years, as they are considered as the most viable solution to help protect the environment and to achieve high energy efficiency for transportation [1]
This paper has investigated the characteristics of Interior permanent magnet synchronous machines (IPMSMs) and PMa-SynRM in terms of
This paper has investigated the characteristics of IPMSMs and PMa-SynRM in terms of electromagnetic and thermal performance via driving cycles for EV applications
Summary
Electric vehicles (EVs) have become more and more attractive in recent years, as they are considered as the most viable solution to help protect the environment and to achieve high energy efficiency for transportation [1]. Yang [12] determined the target torque and the speed curve based on a driving scenario and the design for an axial-flux permanent magnet (AFPM) was optimized to minimize energy consumption Most of these studies focused on evaluating and minimizing the losses and energy consumption of traction motors. This paper compares two IPMSMs and one PMa-SynRM (all using rare-earth magnet) that are based on two standard driving cycles: the Urban Dynamometer Driving Schedule (UDDS) and Highway Fuel Economy Driving Schedule (HWFET) [16] These driving cycles are employed to comprehensively test the traction motor performance in terms of torque, efficiency, and thermal condition.
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