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>i dont know what some of the parts you talk of are.
>>It looks like the brushes,
We know the "brushes" are gone because looking at your photo (nice one by the way, we can see almost everything we need to), we can see all of the "commutator" at the right hand end of the motor. The "commutator" is the copper coloured thing with three slots in it. Each of the three slots has tiny wire connections to the three "windings" on the "armature". These are to the left of the commutator. The function of the commutator is to provide an electrical connection for the 12vDC. The commutator is a moving part, so the electrical connection to it from the chassis is made through contact pressure from the "brushes". If you look at the top of the motor above the commutator you will see two slots. These are where the top end of the brushes fit.

As it stands at present, no brushes means no electrical contact to the windings. No electricity in the windings means no magnetic field to react against the permanent magnet at the left end of the motor. No reaction means no turning of the armature and no motion transmitted to the worm wheel.

I hope this helps.

David
 

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Can you see where the smoke is coming from?

David
 

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>but it stopped smoking now
That's good, and it still works?

David
 
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