Design of a High-efficiency and High-power-density Servo Drive in More Electric Aircraft
High efficiency,high power density and high specific power are the development trends of servo drives of aircraft electric actuation systems.In this paper,three key factors affecting power density,i.e.,power devices,DC-link capacitors,and structural design,were analyzed.First the discrete SiC MOSFETs parallel connection was used and the number of parallel power devices was designed by weighing efficiency and power density.Second the mathematical relationship between capacitor current stress and ripple magnitude and capacitance value was established,and the capacitance scheme with minimum volume was given.Finally the compact mechanical structure was designed to improve power density by using discrete boards and double-side mounted heat dissipation.Based on the above techniques,a prototype with a power of 50 kW and a power density of 11 kW/L was designed.
SiC MOSFETservo drivesmore electric aircrafthigh power densityhigh specific power
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