Looks like the same motor from the ryobi vacuum I took apart. They are meant as throwaway parts. That back plate is crimped on. You can kinda “uncrimp it” (bend it, pry it) then pull it apart and awkwardly access the brushes. After you can re crimp it with a hammer and a punch. You can buy cheap replacement motors. Just got to hope you can find one with the matching shaft style. Not worth disassembling unless you cant find the same type.