| 摘要 |
PURPOSE:To reduce the difference of magnetic flux density in a magnetic gap by securing a permanent magnet oriented in a radial magnetic field to an outside yoke, and securing a permanent magnet oriented in a parallel magnetic field to an inside yoke. CONSTITUTION:A permanent magnet 5 oriented in a radial magnetic field is secured to an outside yoke 2. A permanent magnet 5' oriented in a parallel magnetic field is secured to an inside yoke 2'. Thus, the magnetic flux densities of the magnetic gaps of the inside and outside of the center yoke 3 are equalized to high value, thereby performing high performance of an electromagnetic drive device.
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