Can someone help me understand what the function of the coil is on the input leads to this small DC motor. The coil is formed from magnet wire wrapped around plastic. There is no conductor running through the plastic therefore all the current to the motor needs to run through this coil. My only thought is that it smooths the PWM signals from the speed controller but I don't understand how. Thanks in advance.
(note the coil is cut in this pic as I was confirming if there was a conductor running through the plastic).
**broken link removed**
(note the coil is cut in this pic as I was confirming if there was a conductor running through the plastic).
**broken link removed**