| 摘要 |
PROBLEM TO BE SOLVED: To enable magnification of a linear region of thrust of a single pole linear DC motor, increase of thrust without causing increase of thrust fluctuation, and realization of long stroke without causing increase in thrust fluctuation, by winging a plurality of stator windings which are constituted by the same winding specification of odd number of layer, around a part of a stator corresponding to the moving region of a needle. SOLUTION: The stator 1 is constituted of a first yoke 4, a second yoke 5, first permanent magnets 7a, 7b and a plurality of first stator windings 8(1)-8(n). The needle 11 is constituted of a stator winding 12, wound around the periphery of the first yoke 4 at a prescribed interval.
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