PURPOSE: To facilitate mounting of winding by coupling at least adjoining ones of pole shoe boards, to be secured to a plurality of tooth sections on the inner circumference of stator yoke section, through coupling sections and performing lamination while shifting the coupling section slot by slot.

CONSTITUTION: Windings 13 are mounted on a plurality of tooth sections 12 arranged on the inner circumference of stator yoke section 11. A pole shoe board 21 is provided with a section 22 for coupling at least one set of adjoining pole shoe boards 21 and the coupling sections 22 are shifted slot by slot, when the pole shoe boards 21 are laminated, thus forming a pole shoe assembly 20. A recess 24 (a protrusion when viewed from the underside) is formed in the top face of each pole shoe board in the central part in order to facilitate lamination. Notches 23a in the pole shoe assembly 20 are then engaged with the end parts 12a of the tooth section 12. By such arrangement, the winding can easily be mounted and the pole shoe assembly can easily and quickly be fitted.