To drive a dc motor, we need to add a capacitor in parallel with the motor. How do we decide the capacitance of the capacitor?
In case of a stepper motor, there are two coils. Do we need to use two capacitors? If we use a single capacitor for both coils, how do we decide the capacitance of the capacitor?
Please take this stepper motor Nema 17 Stepper Motor 2A as an example.
By the way, in the article http://electronics.stackexchange.com/questions/95140/purpose-of-the-diode-and-capacitor-in-this-motor-circuit , the author said we need also a diode to drive a dc motor. Is it necessary?
Please forgive me if these are too obvious questions to you ^^.