Patent ID: 6989615
Filing Date: 2006-01-24
Classification: H02K

Abstract:
1. A stepping motor comprising a housing, a rotor and a stator received in the housing, said stator comprising a yoke, said yoke comprising a frame portion surrounding the rotor and a plurality of projections projecting from said frame portion toward the rotor, cylindrical magnetizing coils inserted around said projections, respectively and each adapted to receive supply of a pulse current, wherein an inner wall of the housing is formed with a concaved portion to receive said magnetizing coils inserted around the respective projections, respectively while being kept spaced from said rotor, wherein a wall face rises from a bottom face of the concaved portion at a near side of the rotor and prevents contact between the magnetizing coils and the rotor through contacting the magnetizing coils, and an upper edge of the rising wall face is chamfered and forms an inclined face having a vertically descending angle toward a bottom of the concaved portion for facilitating arranging of the magnetizing coils into the concaved portion.