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<p>For high-performance vehicles with a&#xa0;single-speed gearbox, maximizing the gravimetric peak power and peak torque density combined with a&#xa0;high maximum speed is the decisive design goal of the electric machine. A&#xa0;low vehicle mass leads to a&#xa0;high vehicle acceleration, while a&#xa0;high maximum rotational speed leads to a&#xa0;high top speed. Therefore, this work presents the design and optimization of a&#xa0;high-speed, oil-cooled permanent magnet synchronous machine with a&#xa0;novel circular sector-like permanent magnet shape and a&#xa0;carbon fiber sleeved rotor in combination with cobalt iron laminations. The result is a&#xa0;gravimetric peak power density of 50.9 kW/kg, a&#xa0;gravimetric peak torque density of 30.8 Nm/kg, and a&#xa0;maximum rotational speed of 30000 rpm. The use of two of these electric machines on one drive axle leads to a&#xa0;gravimetric peak axle power density of 12.1 kW/kg and a&#xa0;gravimetric peak axle torque density of 72.1 Nm/kg at system level, including electric machines, gearboxes and inverters.</p>

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High-speed oil-cooled PMSM with novel permanent magnet shape and carbon fiber sleeved rotor for high-performance powertrain

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月13日

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  • Maximilian Clauer,
  • David Bauer,
  • Nejila Parspour

摘要

For high-performance vehicles with a single-speed gearbox, maximizing the gravimetric peak power and peak torque density combined with a high maximum speed is the decisive design goal of the electric machine. A low vehicle mass leads to a high vehicle acceleration, while a high maximum rotational speed leads to a high top speed. Therefore, this work presents the design and optimization of a high-speed, oil-cooled permanent magnet synchronous machine with a novel circular sector-like permanent magnet shape and a carbon fiber sleeved rotor in combination with cobalt iron laminations. The result is a gravimetric peak power density of 50.9 kW/kg, a gravimetric peak torque density of 30.8 Nm/kg, and a maximum rotational speed of 30000 rpm. The use of two of these electric machines on one drive axle leads to a gravimetric peak axle power density of 12.1 kW/kg and a gravimetric peak axle torque density of 72.1 Nm/kg at system level, including electric machines, gearboxes and inverters.