Dear Colleagues,

The growing interest in electric mobility and the new objectives set for the reduction in atmospheric pollutant emissions have pushed research in the field of electric machines for traction applications toward new horizons.

The need to reduce overall dimensions and simultaneously to increase the performance and efficiency of powertrains has paved the way for the use of new technologies that make it possible to fix critical issues related to machine design and performance validation.

The most interesting challenges to be considered include the following: the use of WBG devices to increase the PWM switching frequency and, thus, reduce the current ripple; research of materials and techniques for the lightening of powertrains; the replacement of rare earth permanent magnets with different materials; the study of control strategies to extend the speed range of the powertrain.

The strong block integration and the demands of increasingly challenging requirements have stimulated the development of electric drive systems for electric vehicles in multidisciplinary engineering. Therefore, over recent years, researchers and designers have witnessed the development of multidisciplinary design techniques that combine mechanical and thermal aspects in the electromagnetic design of the machines.

From the point of view of power electronics, the demand for high-powered, smaller dimensions, required the increase in the switching frequency, has led to critical issues with respect the stress on the insulation system. Research pursuing the best designs to balance current and voltage distortion with the dimension and performance requirements has included the exploration of different inverter topologies, such as multilevel inverters and current source inverters.

Electric vehicles represent a fundamental research sector of electrical and mechanical engineering, representing a sector in which the multidisciplinary nature of engineering finds its maximum expression.

Prof. Dr. Claudio Bianchini
Guest Editor

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• wide bandgap
• wide speed range
• flux weakening
• interior permanent magnet machines