US 7,321,178 B2
Spindle motor
Akihiko Wakitani, Ozu (Japan); Masahiro Jyono, Saijyo (Japan); Takao Yoshitsugu, Kita-gun (Japan); and Yoshihiro Ashizaki, Hirakata (Japan)
Assigned to Matsushita Electric Industrial Co., Ltd., Osaka (Japan)
Filed on Dec. 05, 2005, as Appl. No. 11/293,078.
Claims priority of application No. 2004-355935 (JP), filed on Dec. 08, 2004.
Prior Publication US 2007/0013255 A1, Jan. 18, 2007
Int. Cl. H02K 1/00 (2006.01)
U.S. Cl. 310—216 4 Claims
OG exemplary drawing
 
1. A spindle motor comprising:
a rotor magnet supported by a hydrodynamic bearing device so as to be rotatable;
a stator core formed by laminating a plurality of magnetic material plates which have salient pole teeth portions facing the rotor magnet with a predetermined gap interposed therebetween and salient pole arm portions which are connected to the salient pole teeth portions and around which windings are wound; and
windings wound at least around the salient pole arm portions of the stator core,
wherein: the plates of the magnetic material of the stator core have the salient pole teeth portions facing an opposing surface of the rotor magnet substantially perpendicularly; the plates are bent at bent portions between the salient pole teeth portions and the salient pole arm portions such that the salient pole teeth portions and the salient pole arm portions are substantially parallel; a thickness of the bent portions of the plates is made thinner than that of other portions; and the plurality of magnetic material plates are laminated such that gaps are generated above and below the bent portions.