Patent ID: 6628025
Filing Date: 2003-09-30
Classification: H02K

Abstract:
A motor comprising:(a) a cylindrical frame made of ferromagnetic material; (b) a pipe fitted in and disposed within said frame concentrically at a fitted section of the frame, an outer diameter of the pipe being larger than an inner diameter of the frame at the fitted section, the difference between the inner diameter of the frame at the fitted section and an outer diameter of the pipe being between 0 &mgr;m and 20 &mgr;m; (c) a sintered bearing press-fitted into said pipe; (d) a cylindrical magnet fixed on an outer wall of said pipe at an inner wall of said magnet; and (e) a cylindrical coil facing said magnet via an annular space, wherein said frame and said pipe are welded at the fitted section.