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The brushes wear out in brushed motors and their performance decreases until they stop working, but brushless motors have fewer parts in contact and thus don't wear out nearly as fast.
Does the performance of a brushless motor decrease over time or does its performance remain practically the same throughout its life?
Like most things, it depends on how you treat it.
As far as I know, you should never need to worry about a brushless motor wearing out, especially for our purposes where we will likely demolish them before they have a chance to wear out.
You do have to watch out for the bearings and magnets, however.
With the bearings, like any mechanical component, they will eventually wear down, however this will likely not be for a long time. It is still a consideration, though.
You also have to watch out for the magnets.
Under normal circumstances, the magnets are fine to last a long time, however excessive heat can eventually demagnetise them, leading to reduced performance and eventually the motor not producing enough power for us to use.
If anyone has any other ideas or wants to correct me, please do!
Not really. Since brushless DC motors have no brushes to get worn out, they represent a huge leap forward in technology. Brushless motors have significantly higher efficiency and performance, and a lower susceptibility to mechanical wear than their brushed counterparts. They can last 10,000s of hours if used correctly and not overheated etc.
