See post No2, & 4 they work effectively on the DC TM motors.
https://forum.allaboutcircuits.com/threads/dc-motor-choke-filter.192963/

 

Choke-Input Rectifier-Filter

The Choke-Core size/weight can not be "too-big", but it can easily be "too-small".

When the Core size/weight is too small, the Core will become "Over-Saturated",
and not be able to store any additional Energy past a certain level.

More Copper, or more Winding-Turns, can not make up for an inadequate Inductor-Core-Mass.

But, the Inductors don't have to be perfect to be of "some" advantage in improving the Filtering process.

Generally, if the Capacitors are big enough, and can handle enough Current for the application,
by themselves,
then the Inductors can be considered to be "Icing on the Cake", when not applied haphazardly.

This is why the Inductors, no matter where they came from, must be measured.
Their "Series-Resistance", and their "Inductance in Milli-Henries" must be known.
( Their "Parallel-Capacitance" measurement is largely irrelevant at ~50/60hz operation )

Then You can enter these important numbers into a Software-Simulation-Program and actually get
a pretty reasonable idea of what type of performance You will get, in a real Circuit, in the real-World.
Potential problems will usually also show-up,
lessening the likelihood of future random projectiles flying across the room, hair-pulling, and profane-rants.

Re: the below Videos ..........
This guy is not "technically-correct" on a few points,
but the information that he delivers is solid and valuable.
Also Note,
that he is referring to an "SCR" Light-Dimmer-Control adapted for use in controlling the speed of a DC-Motor,
this is very different from the "PWM" Motor-Control-Scheme that I have recommended,
but many of the principles and functions are very similar between the 2 topologies.
The PWM-control-method is far more sophisticated than an SCR-Dimmer-Control,
and is much quieter, and easier on all of the Components, including the Motor it's self.

His application is more concerned with simply "toning-down" the huge amount
of Electrical-Noise generated by an SCR-Controller,
the PWM-Controller benefits from removing as much "DC-Ripple" as is practical.
The PWM-topology will still work with heavy DC-Ripple-Voltage,
but many of the advantages of a well done PWM-topology will be lost,
namely smoothness and quiet operation,
which an SCR-topology has a very difficult time in delivering without lots of extra Filtering.
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Information on Chokes ..........

More info on DIY MOT Chokes .........
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