hello friends,
In dc motor if there is spark problem we are using capacitor across the motor
How to calculate the value of this capacitor with respect to motor parameters..?

 

What kind of spark problem?

 

capacitor is used to suppress the high frequency electrical noise in DC motor but how actually it works (mathematical module..?). to calculate value of capacitor value???..thanks

 

It presents a low impedance to the high frequency noise. It is common to place one capacitor from each conductor to ground, or better yet to the case of the motor. The capacitors can be combined with various kinds of inductors to improve performance. There is no one-size-fits-all design equation, but maybe this document will give you the information you seek
www.x2y.com/publications/dcmotors/feb14-05.pdf