| 摘要 |
PROBLEM TO BE SOLVED: To reduce the cogging force and heat generation of a linear motor and improve the performance of the linear motor without increasing the cost. SOLUTION: A linear motor is composed of stators, which have respective permanent magnet rows facing each other and mover which runs between the stators. A mover 10 is constituted of main division cores 12, on which coils 11 are wound and auxiliary division cores 13 on which coils are not wound and the auxiliary division cores are formed of layered magnetic steel plates which have identical shapes or shapes similar to the layered magnetic steel plates of which the main division cores 12 are composed. The layering thicknesses of the auxiliary division cores 13 are successively reduced, the farther away they are from the main division cores 12. The shape of the magnetic steel plate is made into one of cross-shape, T-shape or I-shape. The sum of the lengths of the auxiliary division cores 13 satisfies the inequality: the sum <=(2×pole pitch). If a solid core 53 is used for the auxiliary division core 13, the shape of the side view of the solid core 53 is a chevron shape pentagon which is made to satisfy the inequality: chevron height $(2×pole pitch). The number of the main division cores 12 is made a multiple of 3.
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