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I'm repairing (hopefully) a 12V DC motor (Johnson Electric HC971(2)LG-101).

The motor has a coil in the motor cap between each terminal and the corresponding brush - two coils (inductors) one on each side of the armature electrically speaking. It also has what I think is a resister on one side and what I think is a (broken) capacitor between the two terminals.

What is the function of the two inductors in series between the terminals and brushes?

I'm sure this info it's out there somewhere but I haven't found it online after several days of searching. Thanks.

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Likely the series induction prevent higher frequencies from making it back from the motor to the power supply. The inductors looks like an open circuit to higher frequencies.

A parallel capacitor can also help as it shorts the higher frequencies preventing them from getting back to the power supply.

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    $\begingroup$ Sounds like your motor has field windings and an armature winding, and no permanent magnets. Do you have a wiring diagram? $\endgroup$ – user241585 Jul 21 '17 at 21:06

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