Patent ID: 6316850
Filing Date: 2001-11-13
Classification: H02K

Abstract:
A small-sized motor, comprising: a casing having a closed-bottomed cylindrical shape and including a magnet attached to an inner surface thereof; a casing cover fitted to said casing so as to close an opening portion of said casing and including a brush attached thereto; and a rotor including a shaft, a laminated core forming salient magnetic poles of an odd number and mounted on the shaft, windings, each being wound around a plurality of salient magnetic poles, and a commutator mounted on the shaft,wherein each salient magnetic pole includes an arm portion and wing portions, which are integrated with ends of the arm portion and circumferentially extends symmetrically with respect to the arm portion; andwhen the laminated core blanked from a silicon steel sheet having a thickness u through press-working has a diameter D, and the wing portions have a thickness t as measured at its root in a radial direction, the thickness t falls within a range the upper limit of which is 5.5% the core diameter D and the lower limit of which is the sheet thickness u.