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A Low-Inductance DC Bus Capacitor for High Power Traction Motor Drive Inverters

For a battery-powered traction motor drive, the

inverter dc bus presents high-frequency pulsating current due to

device switching. Conventional inverter design sizing dc-bus

capacitor based on voltage ripple is no-longer effective. In order

to handle high current in high temperature environment, a lowinductance

high-current film capacitor is proposed to replace

the conventional electrolytic bulk capacitors for a 75-kW

traction motor drive inverter. The proposed design results in

significant size reduction and performance improvement over

the existing one. Characteristics of the low-inductance highcurrent

film capacitor are presented to show its superiority to

the conventional electrolytic capacitors. Experimental results are shown to verify the need of the proposed capacitor.A_Low-Inductance_DC_Bus_Cap_for_High_Performance_Traction_Motor_Drive_Inverters 
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