| 摘要 |
PROBLEM TO BE SOLVED: To reduce hysteresis loss caused by the compression stress at mounting of a stator to a frame, in a motor stator. SOLUTION: In a stator 1 of a rotating electric machine, stator pieces 2 is made into an annular shape, by molding with plural sheets of substantially T-shaped magnetic pole pieces, each having a yoke 3 and a tooth 4 projected from the yoke 3 in the thickness direction. Stator winding 6 in the stator 1 is wound on each tooth 4 of the stator piece 2, and the stator 1 is installed and fixed into the frame 10, by making use of the difference between the outside diameter of the stator 1 and the inside diameter of the frame 10. The magnetic pole piece is formed, by punching a non-oriented electromagnetic steel plate so that the direction vertical to the symmetry axis 12 of teeth in the main magnetic flux region 9 in the yoke 3 becomes the direction of rolling; and the average of the compression stress becomes 50 MPa or lower in the three-round direction of the yoke 3 by the installation of the frame 10, in the main magnetic flux region 9 on the internal perimetric side of the yoke 3. COPYRIGHT: (C)2008,JPO&INPIT
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