MOTOR

• Main Author: TANIMURA SATOSHI
• Format: Patent
• Language: English
• Published: 15.12.2011
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; GENERATION

PROBLEM TO BE SOLVED: To provide a motor that can suppress occurence of vibration and noise without reducing verticality of a motor shaft.SOLUTION: A motor 1 is provided with a first magnet 4 and a second magnet 5 that are positioned so as to face each other across a rotor core 9 fixed to a motor shaft 8. Remanent magnetic flux density Br1 of the first magnet 4 is higher than remanent magnetic flux density Br2 of the second magnet 5. A first gap G1 between the first magnet 4 and the rotor core 9 is narrower than a second gap G2 between the second magnet 5 and the rotor core 9. Dimension N1 of the first magnet 4 is larger than dimension N2 of the second magnet 5. Thus, a first magnetic attractive force F1 of the first magnet 4 is larger than a second magnetic attractive force F2 of the second magnet 5. The resultant of the first magnetic attractive force F1 and the second magnetic attractive force F2 moves a rotor 7 to a side of the first magnet 4, so that a motor shaft 8 is magnetically urged against respective inner circumferential portions 11a and 12a of a first slide bearing 11 and a second slide bearing 12, which are coaxially arranged in an axial direction of the motor shaft 8, on the side of the first magnet 4.