Patent ID: 7825556
Filing Date: 2010-11-02
Classification: H02K

Abstract:
1. A stepping motor comprising: a stator comprising a rotor rotatably disposed in a cylindrical hollow space enclosed by the first and second pluralities of pole teeth of the stator, the rotor comprising a pair of bearings disposed to sandwich the magnet of the rotor, each of the bearings attached to the first yoke of the stator, wherein the bearing comprises a hollow-cylindrical main body, and a flange structure comprising a plurality of protrusions to extend radially outwardly, to engage with the plurality of notches of the bottom plate of the first yoke, and to be disposed in contact with the bobbin, and wherein the circular opening is further defined by inner faces of the first plurality of pole teeth of the first yoke, and the hollow-cylindrical main body is fitted inside the further defined circular opening.