Electronics > Beginners
Cleaning a DC motor without disassembling
mike_mike:
Hello,
I have a question regarding the cleaning of a DC motor.
I have a mini drill (Proxxon Micromot 50) and I want to know how can I clean up the motor of this mini drill without disassembling the motor.
I already opened the case of the mini drill, I cleaned up the interior of the case and I used WD-40 to lubricate the axis that is outside of the motor.
What can I do to clean up the interior of the motor, without disassembling the rotor and the stator ?
I am not sure if there is dirt in the interior of the motor, but I just want to do a cleaning operation.
Rick Law:
Compress air blast?
Since you said mini-drill, I assume it is small. So, may be those hair-spray size compress air dust cleaner cans could do the job. You can get those from stationary stores or walmart - sometimes around PC supplies since it is often associated with cleaning keyboard.
Jwillis:
Those types don't usually require a lot lubrication ,if any, because of the bronze bearings. Get some Non lubricating Deoxit electronics cleaner and spray in around the brushes and armature.That will clear any contaminates around the brush contacts and commutator bar.Excessive oil will burn around that area and reduce he efficiency of the motor.If you wish to use a lubricant use sparingly and only a very small drop on each bearing.
innkeeper:
there are purpose make clears for motors
crc lecta-motive is one easy to get at many auto supply places.
there's is also lectra clean by crc which some people use.
I use something i also use for brushed RC cars - T.A. Emerald Performance Plus 4
these cleaners do not attack to enamel wire coatings!
Do lube the bearings though after using it.
link to a video on how to..
Ian.M:
WD40 is *TOTALLY* unsuitable for lubricating high speed precision motor bearings (oilite bush or ball bearings). The non-volatile oil component of WD40 + ozone from the sparking at the brushes will sooner or later form a varnish-like gum, and if you carry on running it the heat from friction will carbonise the gum, destroying the bearings.
After cleaning the motor with anything other than dry air, place it in a warm place for 24H to drive off any solvent residue then relubricate oilite bushings or non-sealed ball bearings with a drop or two of light machine oil (ideally spindle oil). Turn it over by hand to distribute the oil then with the bearing end of the shaft downwards, carry on turning it over and wipe off *all* excess oil with a lint-free wipe, applied where the shaft enters the bearing. Carry on wiping with a clean fold of the wipe till no more oil transfers to it.
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