Use of CAPACITORS for DC generator/Motor

[MEERA]

What is capacitor ratings value ?
Why it is necessary t o use it in parallel with DC Motor/Generator ?

 

[duke37]

If the generator produces true DC then capacitors do not do anything and are not necessary.
In the real world the generator produces ripple and noise superimosed on the DC and this may cause trouble in other parts of the system.

A capacitor will have an inductance and will only work as a capacitor below its resonant frequency. Thus the capacitance and construction will depend on the frequency to be smoothed. The capacitor voltage rating must be above any voltage that it will see.

 

[MEERA]

Thanks Duke !
can u tell me the Capacitor Ratings to be used for a 12v DC generator !!

 

[duke37]

It all depends on the trouble which the noise causes. You may need a 1000µf for lower frequencies and 0.1µF disc ceramic for radio frequencies. Unfortunately it is a matter of suck it and see.

 

[MEERA]

Thanks Dude (Duke) !