| 摘要 |
PURPOSE:To change the characteristics of the motor easily by setting up a cylindrical magnetic material yoke to the inner wall of the cylindrical case of a nonmagnetic material while being opposed to a magnet. CONSTITUTION:The cylindrical magnet 4 is disposed at the center in the cylindrical case 1, and a cylindrical coil 9 is arranged rotatably between the magnet 4 and the case 1. The cylindrical case 1 is formed by the nonmagnetic material while the cylindrical magnetic material yoke 6 is set up onto the inner wall of the cylindrical case 1 as being opposed to the magnet 4. Accordingly, the characteristics of the motor can be changed simply because an arbitrary gap between the magnetic material yoke 6 and the magnet 4 can be set by replacing the yoke 6 with one of different thickness. |
