| 摘要 |
PROBLEM TO BE SOLVED: To provide a motor which can freely provide a digital skew to a rotor magnet at a low cost. SOLUTION: Since the number of magnetic poles of a magnet is 8 and the number of teeth is 12, the least common multiple becomes 24, and cogging can be minimized by displacing the magnetic pole for the value, a half of 15 deg., which is obtained by dividing 360 deg. with the least common multiple 24, namely by 7.5 deg.. If a key groove 21 of the rotating shaft, a groove 31a of the first rotor unit 3a of the first stage and a groove 31c of the second rotor unit 3b of the second stage are aligned and are engaged to fix these with a key 22, by setting the displacing angleθ1 of the groove 31b to 5 deg., displacing an angleθ2 of the groove 31c by 7.5 deg. and a displacing angleθ3 of the groove 31d by 2.5 deg. with reference to the groove 31a, the magnet pole positions of the first rotor unit and second rotor unit are displayed by the angleθ2 of 7.5 deg. in the digital skew.
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