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Capacitor for a PWM controlled DC motor

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atferrari

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I am currently completing the assembly of a small coil winding machine driven by a 12V/45 mA PWM-controlled motor.

At two different robotic oriented sites I have found the recommendation of adding a capacitor to its terminals allegedly to protect the motor.

If true, what is the actual reason to use it? How to calculate / check the value of C?
 
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