This protects SMD components including the controller from back EMF voltage damage.Ĭapacitors can be connected in parallel to add their capacitances.Īvoid capacitances higher than the rule of thumb 1A motor current ~ 1000 ♟ capacitance. The filter circuit permanently smoothes voltage peaks to a low voltage. If the motor generates large voltage peaks in the back EMF signal during rapid acceleration or braking ramps, this threatens the dielectric strength of the SMD components on the motor controller board. Thanks to line resistance, the capacitor in the DC link also acts as an RC element and low-pass filter. Similarly, in switching power supplies, they also smooth the pulsating DC current that occurs during rectification of AC voltage: "wavy" operating voltage becomes "smooth". At the same time, the power supply itself is subjected to less load.Ĭharging capacitors permanently smooth voltage peaks of the motor-induced back EMF signal. This results in more torque and higher power for the drive motors. They buffer the voltage and supply high peak currents during short-term loads. Capacitors are a useful addition to switching power supplies.
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