I am designing a motor driver for a three phase brushless motor and have been looking for a capacitor value for the DC bus of this circuit (C1). Most of what I have found when researching deals with smoothing capacitors during rectification of an AC to DC circuit.
What I am looking for is to calculate the capacitor size 1 - to allow the power supply or battery to catch up due to the high current draw. 2 - to suppress the high voltage coming back into the circuit due to induction. From what I know so far is appears that the capacitor size isn't super critical to meet requirement 1, something between 100~1000 uF. Also the inductance values for L1, L2, and L3 is not representative of the actual motor.
This circuit drives a 24 V motor with a peak current of 30 A, lets say with a 20 kHz PWM signal.