Hi guys
I am finishing a E-Bike motor drive design. In my design, the DC-Link capacitor is composed by three electrolytic capacitors in order to compensate the maximum current ripple in the DC-Bus. The advantage is the usage of cheap capacitors sacrificing PCB area. In my system, the voltage source is a battery pack (40-58V) and maximum motor current is 30Arms.
Where do you recommend to place the DC-link capacitors, close as possible of each inverter leg (one capacitor per leg) or make capacitor bank between three-phase inverter and DCLink voltage source?