STEM与日常科技·英语30篇（5）

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电动航空推进器功率密度瓶颈

Electric aircraft need motors that deliver high power while staying extremely light and compact.
Current electric motors achieve about 5–7 kW/kg, far below gas turbines’ 10–15 kW/kg.
Battery energy density limits flight duration, but motor power density restricts takeoff thrust.
Heat buildup in small, high-RPM motors forces heavier cooling systems that add weight.
Superconducting wires could raise power density, but they require costly cryogenic support.
Materials like silicon carbide semiconductors improve efficiency but remain expensive to scale.
Researchers test new magnet geometries and direct-drive architectures to cut losses.
Ground testing shows promising torque-to-weight ratios, yet certification lags behind lab data.
Urban air mobility vehicles prioritize short hops where power density matters most.
Solving this bottleneck will unlock regional electric flights within the next decade.