| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem wherein the strength of materials is weak and rotation causes vibration and noise in rotors comprising rotating magnets formed with resin where magnets made of plastic resins are mixed with elastomer.SOLUTION: When the rotating magnet is formed with the magnet made of an elastomer-mixed plastic resin, a rotor core is integrally embedded for formation. The rotor core has a shape where projections are equally formed in a direction crossing an axis, and the number of projections is set to a prime number not less than 5. |
