| 摘要 |
PURPOSE:To avoid leakage of magnetic flux, by forming a magnetic gap with high dimensional accuracy through a simple working. CONSTITUTION:A permanent magnet 3 is located at the circumference between two magnetic subtance plate 1, 2, and the center of the plates 1, 2 is made continuous and fixed via the permanent magnet 3 of the plates 1, 2, and a part between the continuous part of the permanent magnet 3 of one plate 1 and that of another plate 2 is cut off to form a gap 4. |
