Abstract
The power density of electrical machines for transport applications has become a critical aspect and target of optimization. This paper looks at the development of an intelligent, rapid, flexible, and multidomain tool to aid for system-level optimization of electrical machines within next-generation high power density applications. The electromagnetic, thermal, and mechanical aspects are wholly integrated, thus enabling the optimization including the nonactive mass. The implementation and overall architecture of the tool are described, and using a case study drawn from the aerospace industry, the tool is used to compare the power density of various surface permanent magnet topologies including single airgap and dual airgap machines, highlighting the particular suitability of the dual rotor topology in achieving the best power to mass ratio. Finally, the accuracy of the tool is highlighted by practical realization and experimental validation.
Highlights
ITH the globally increasingly stringent emissions legislations and fuel economy requirements, companies in the transportation sector are actively and intensely researching new technologies, which often involve electrification and the use of electrical machines for either motoring or generation.The performance targets in this type of work are various and depend a lot on the specific industry and application
This paper describes the development of such a tool
[4] are possible through the described highly intensive cooling strategies together with the integrated optimization of the inactive mass components and 2) the dual rotor (DR) topology achieves the highest power density compared to the other radial Surface permanent magnet (SPM) topologies
Summary
ITH the globally increasingly stringent emissions legislations and fuel economy requirements, companies in the transportation sector are actively and intensely researching new technologies, which often involve electrification and the use of electrical machines for either motoring or generation. In the land transportation industry, for road transportation, where volume is often highly constrained, the key power density metric is the power to volume ratio or kW/L, with numbers such as 4.8 and 4.2 kW/L achieved by Toyota and Nissan [1], respectively. For the aerospace industry, mass minimization, rather than volume, is critical and the key power density metric is the power to mass ratio or kW/kg, with various numbers published to show achievements of particular developments, such as a recent 5.2 kW/kg by Siemens for a light electric aircraft [4]. The tool is adopted and used for an aerospace application where it is required to compare the achievable kW/kg for various permanent magnet (PM) machine configurations under an intense cooling regime, with the intent. Of establishing, which PM machine topology yields the best power to mass characteristic
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