| 摘要 |
PROBLEM TO BE SOLVED: To make uniform scattering of the magnetic flux density between poles and to reduce torque irregularity by making specific the number of gears of a stator that is combined with a cylindrical magnet when the number of magnetization in a peripheral direction in the cylindrical magnet is set to an even number that is equal to or more than four. SOLUTION: When the number of magnetization in a peripheral direction in a cylindrical magnet 23 that is orientated in one direction being vertical to a cylindrical shaft is set to k (k is a positive even number that is equal to or more than four), the number of stator gears 21 being combined with the cylindrical magnet 23 is set to 3k.n/2 (n is a positive integer that is equal to or more than one). Also, the skew angle of the cylindrical magnet 23 ranges from 1/10 to 2/3 of the angle (360/k) for one pole and is made of k multiple-pole skew magnetization. Further, the skew angle of the stator gears 21 ranges from 1/10 to 2/3 of an angle (360/k) for one pole similarly and is provided with 3k.n/2 skew gears. For example, by setting the number k of magnet poles to 6 and the number 3k.n/2 of gears to 9 (n=1) in the combination of the pole of the magnet and the stator gears 21, the magnetic flux scattering can be relaxed also in a cylindrical magnet being orientated in a diameter direction with scattering in the magnetic flux density and suppressing rotation irregularity.
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