Novel switched reluctance propulsion motor drives for electric and hybrid electric powertrains

在交通运输领域，有一个不断发展的范式转变，即向更环保的电动和混合动力汽车转变。事实上，动力总成电气化可以带来更高效、更高性能、更清洁和更安全的车辆。然而，电动、混合动力和插电式混合动力电动车辆（EV、HEV和PHEV）的大规模商业化的主要技术挑战包括开发低成本、可靠、坚固、容错和可扩展的电推进马达驱动器。拟议的研究计划是集中在一个新的家庭开关磁阻电机（SRM）驱动器，以克服这些重大挑战。 建议的研究目标是开发SRM驱动器具有优良的牵引性能和较低的成本相比，目前使用的永磁无刷和感应电机。转子上没有绕组或永磁体以及简单的机器构造使得SRM成本较低，并且它们的高峰转矩惯性比和宽速度范围使得它们非常适合于推进应用。然而，高转矩涟漪、噪声和振动阻碍了SRM的广泛使用。此外，与永磁无刷电机相比，常规SRM具有较低的功率密度。因此，期望减少转矩涟漪和声噪声并改善SRM的转矩产生。所提出的新SR电机的转子极数比定子极数更多。这种新颖的定子和转子极组合为SRM设计提供了更高的转矩、更低的转矩涟漪和更好的性能，同时对于大批量生产来说也是固有地更便宜的。 所提出的SRM技术与常规已知SRM相比具有若干优点。这些优势包括更高的功率密度、更低的转矩涟漪、更高的效率和更低的铜损，以及更好的热性能。预计这些显著的改进将导致开发用于EV、HEV和PHEV的推进应用的先进低成本、可靠和容错的SRM。

There is an evolving paradigm shift in transportation toward more environmentally friendly vehicles with electric and hybrid powertrains. In fact, powertrain electrification results in more efficient, higher performance, cleaner, and safer vehicles. However, major technical challenges for the mass commercialization of electric, hybrid, and plug-in hybrid electric vehicles (EVs, HEVs, and PHEVs) include the development of electric propulsion motor drives that are low cost, reliable, rugged, fault tolerant, and scalable. The proposed research program is focused on a novel family of switched reluctance motor (SRM) drives to overcome these major challenges. The proposed research objectives are aimed at developing SRM drives with excellent traction performance and lower cost compared to the currently used permanent magnet brushless and induction motors. The absence of windings or permanent magnets on the rotor and simple machine construction make SRMs lower cost and their high peak torque-to-inertia ratio and wide speed range make them well suited for propulsion applications. However, high torque ripple, acoustic noise, and vibration have prevented the widespread use of SRMs. Furthermore, conventional SRMs have lower power density compared to the permanent magnet brushless machines. Therefore, there is a desire to reduce torque ripple and acoustic noise and improve torque production of SRMs. The proposed new SRMs have a higher number of rotor poles than stator poles. Such novel stator and rotor pole combinations provide SRM designs with higher torque, lower torque ripple, and better performance while also being inherently less expensive for high volume production. The proposed SRM technology has several advantages compared to the conventional known SRMs. These benefits include higher power density, lower torque ripple, higher efficiency with lower copper loss, and improved thermal performance. It is expected that these significant improvements will lead to the development of advanced low cost, reliable, and fault tolerant SRMs for propulsion applications of EVs, HEVs, and PHEVs.