Abstract
Electric compressor systems for air conditioning operations are an essential part in battery electric vehicle systems, which are not applicable to conventional belt-driven compressors due to no combustion engines. Three-phase voltage source inverters (VSI) and interior permanent magnet (IPM) motors are generally used for electric compressor systems in battery electric vehicles. Direct current (DC)-link capacitors are a critical component in the power converter systems, which affect the cost, size, performances and scale. Metallized polypropylene film capacitors are considered more reliable than conventional electrolytic capacitors for high temperature environments such as electric vehicle applications. This paper presents comprehensive comparisons and evaluations of electric compressors with two types of DC-link capacitors. Based on a 5 kW IPM motor drives and a VSI with a nominal DC voltage of 360 V for electric compressors, performances with electrolytic and film capacitors have been evaluated by experimental tests.
Highlights
In recent years, the necessity of environmental issues caused by global warming and pollution concerns have been getting accelerated research on battery electric vehicles [1,2,3]
Electric compressors have been employed in battery based electric vehicles due to their structures without engines, whereas compressors have been driven by powers of engines in internal combustion engine (ICE)-based vehicles
Direct current (DC) Capacitors used in voltage source inverters (VSI) of the Electric Compressor System in an Electric Vehicle
Summary
The necessity of environmental issues caused by global warming and pollution concerns have been getting accelerated research on battery electric vehicles [1,2,3]. The electric compressors with the electrolytic capacitor and the film capacitor are evaluated in terms of capacitor characteristics, Root Mean Square (RMS) values of DC-link currents, ripple characteristics of capacitor voltage/current, power losses, and junction temperatures in this paper. For the purpose, based on a 5 kW IPM motor drives and a VSI with a nominal DC voltage of 360 V for electric compressors, performances with electrolytic and film capacitors have been evaluated by experimental tests. The electric compressor system with the film capacitor based VSI showed lower power losses and lower peak-to-peak voltage fluctuation, and lower RMS values of DC-link voltage, than that with the electrolytic capacitor based VSI. The electric compressor system with the film capacitor exhibited higher percent RMS current value in the DC-link, in comparison with the electrolytic capacitor. FATC consists of an electric compressor and an inverter to drive
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