Engineering Capacitor in a switching circuit

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The 47μF capacitor in the switching circuit for a switched reluctance motor is primarily used to mitigate switching noise and voltage dips caused by sudden high-current changes. It helps reduce harmonics and ripple in the power supply, ensuring stable operation. Additionally, it's recommended to use a smaller non-electrolytic capacitor in parallel, as larger electrolytic capacitors perform better at lower frequencies while smaller capacitors handle high-frequency noise more effectively. This configuration enhances overall circuit performance and reliability. Proper capacitor selection is crucial for optimal function in switching applications.
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Homework Statement
This is a switching circuit for a switched reluctance motor. At the right hand side of the circuit attached below, there's a 47μF capacitor. What is the need for that?

The attempt at a solution
Is it to reduce harmonics or ripple, or something of the sort?
 

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nothing909 said:
Is it to reduce harmonics or ripple, or something of the sort?
Something like that. It's meant to keep switching noise and voltage dips due to sudden high-current changes in a load out of the power supply and other circuits. Usually there should be another smaller capacitor in parallel with it since the larger valued capacitors like 47 μF are usually electrolytics and have practical characteristics that are better at lower frequencies. A small non-electrolytic in parallel will deal better with high frequency noise. Look up "decoupling capacitor".
 

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