| 摘要 |
PROBLEM TO BE SOLVED: To improve the stability of a stepping motor in non-conduction state at any step position, at the same time facilitate assembling operation, and improve assembling accuracy. SOLUTION: A motor is constituted of a rotary shaft, rotors 3 where each i×S poles and i×N poles are alternately arranged so that the entire outer periphery forms a circle with the rotary axis as a center, a pair of stators 1 and 2 with two magnetic poles where angles for the rotary center of the rotors 3 form approximately 90 degrees, a coil that is wound around the stators 1 and 2. A groove 3a in the same shape is formed at the center part of the inner-periphery surface of each magnetic pole for constituting the rotors 3, thus distributing magnetic flux also to the peripheral part of the magnetic pole and hence forming a force peak on non-conduction at any step stop position, and improving non-conduction stop point accuracy. Also, a protruding piece 4 that is fitted into a groove 3a is formed at the rotary shaft, thus facilitating position matching and improving assembling accuracy. |
