| 摘要 |
PROBLEM TO BE SOLVED: To increase driving force without the need for size change and attain precise operation, because magnetic saturation can be prevented in a slender and rod-like inner yoke 3. SOLUTION: A pair of stator coils 2-1, 2-2 are brought into a close contact with the inside of a cylindrical outer yoke 1. The rod-like inner yoke 3 is coaxially disposed inside the outer yoke 1. A pair of annular field magnets 4-1, 4-2 are fixed on the outer periphery of the inner yoke and arranged side by side with a void formed in the traveling direction of the inner yoke. An auxiliary magnet 6 is disposed so as to be sandwiched inside the void. COPYRIGHT: (C)2003,JPO |
