Electric motor maintenance. To lubricate or not to lubricate?

kaazmaze wrote:

...that's the word I missed, pan similarly, I understand it's the part that holds the longer rotor shaft in the bracket attached to the winding block. And only there lubrication.

I don't think you understand very well though . The engine has not one, but two pan, they are barrel-shaped and are the bearing of the rotor shaft of this engine. To clean and lubricate them you should remove them from their housings. How? By releasing the spring-loaded plates holding them in the housings. When you remove the plates in addition to the pan, there should be a felt ring there, but it doesn't have to be. You will clean everything thoroughly by spraying, for example, WD40 or a similar preparation. You will put the pan in a pot and boil it in oil. You won't buy special; boil in gear or engine oil. How long and at what temperature? As long as possible, although half an hour will suffice. The temperature depends on the oil, it would be good to keep it high, but try not to make smoke appear over the oil. When boiling, be careful not to burn yourself, and it's better to do it outside the living area, because boiling oil does not smell very nice. After boiling and cooling, wipe everything dry and assemble. If there were felt rings, soak them decently in oil before reinserting - and squeeze them firmly between your fingers to squeeze out the excess. To soak these felts are suitable rare machine oils, the silicone one advised to you earlier is very good, but one for lubricating the sewing machine can also be.

supchem wrote:

A question I have is why boil the plain bearing in oil and how will it help? ...

For many years, plain bearings (here pan bearings), are made by powder metallurgy. Not all, but 99.99% in low-power machines. The cheapening of this technology due to its virtually monopolization by a global supplier like the PRC has made them ubiquitous for a decade. Sinter, which usually consists of iron, bronze, graphite and patented additives, is cheap to produce because it requires virtually no machining. The essential feature, however, is its porosity; capillary holes are saturated with oil to ensure self-lubrication. Rotation of the shaft in the pan causes its temperature to rise, which causes oil to flow out - of this magnitude to give it an optimal lubricating film. Stopping the rotation and dropping the temperature, in turn, sucks the lubricant back into the pores of the pan.
Well, what about that cooking? It never hurts with usually helps. After a long period of use, the pan collects microcontaminants from the shaft, which, figuratively speaking, effectively seal the mouths of its micropores. The low price of the pan should make you want to replace it, but Lebanese practitioners have found a way both to clean its inner surface and to "re-inflate" it with oil. Boiling in oil is not patented and deviates from their manufacturer's technology, but life has proven the validity of the application. Boiled pan, - if they have not been seized early they work like new. There is a lot of material on the net about self-lubricating bearings, I give a link to "pictorial": Link I'll just add that spherical bearings in motors of a design like the one in this thread - once commonly used in adapters and tape recorders, were the first to use their self-lubricating design.