Abstract-In the coming years, the electrification and the deployment of the electric motors in the urban transports will become a reality more and more widespread. The optimization stage of the electric motors usually does not consider in detail the real driving conditions of the car in which the motor is installed. It follows that the actual motor performance in operating points, especially as regards the torque ripple and the efficiency, might be worsen than expected. A robust solution is a required target. This paper deals with the design and optimization of a high speed permanent magnet assisted synchronous reluctance motor for traction applications, taking into account of both city and highway driving cycles. A procedure is employed in order to evaluate the most representative operating points, which have to be considered for the global optimization. An analysis of the robustness of the solutions has been performed. Both results and advantages of the adopted methodology are highlighted.
I. INTRODUCTIONThe progressive electrification of the private transport systems is becoming a well-established reality in the international scenario since it is seen as the most promising solution to reduce air pollution, oil dependency and to improve energy efficiency. As for convention internal combustion engine (ICE) vehicles, the performance of an electric vehicle are strictly related to the driving conditions of the car in which the motor is installed. On the other hand, the optimization procedure of the electric motors does not often consider the actual working conditions. For this reason, when the machine works, it becomes mandatory to optimize the design in the most profitable areas in which the motor operates, in order to improve the overall performance. On this basis, some recent researches [1]-[4] have introduced new design and optimization techniques for traction motors, in order to enhance the efficiency against a defined driving cycle. On the other hand, previous researches have investigated neither the optimization of the torque ripple, nor the robustness of the solution, over the aforementioned driving cycle. This paper aims to present an optimization procedure of a Permanent Magnet Assisted Synchronous Reluctance (PMASR) motor for traction application, considering a city and a highway driving schedule. The motor is equipped with a 36-slot 4-pole and an integral-slot distributed winding. A high grade Ferrite PM is considered. The interest in Ferritebased PMASR motors [5]-[8] is spreading in the last years, as a consequence of the instability and the increase of the price of rare earth magnets. Moreover, it provides a high flux weakening operating range, which is usually an important requirement in traction applications. Conversely, the most
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