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Oct24-03, 03:54 PM
P: 26
Hello, New to this forum, thanks for having me. I have been researching electromagnetics to better understand the workings of the tools of my trade (tattoo artist) and have come upon a number of questions and cannot seem to find the answers. I would appreciate any help to point me in the right direction. This will be my first question.
A tattoo machine is basically a dc circuit containing two magnetic coils in series with a capacitor in parallel which operate an armature on a spring contact. Think doorbell. The capacitor is basically there to suppress the spark generated by the rapid collapse of the magnetic field as it switches itself on and off. My question at this point (I will have more concerning magnetics later) is...why does changing the value of the capacitor cause the machine to run faster for smaller and slower for larger values of capatance. As I understand it the energy created by the collapse of the magnetic field (since dc will not go through a cap.) is kind of sloshed back and forth through the coils until it is reduced to zero by the resistance. Why would the speed of the armature be related to the speed at which the cap. discharges this energy back and forth. Thanks
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