SPINDLE MOTOR

摘要

PURPOSE:To provide a bonding/fixing structure in which the bonding strength between a shaft and a stator core is improved and which exhibits a stable performance under the temperature variation in an operation environment. CONSTITUTION:A rotor yoke 2 is inserted into a first hub 1 and bonded and fixed to the inner circumference surface of the first hub 1 with anaerobic adhesive. A rotor magnet 3 is inserted into the rotor yoke 2 and bonded and fixed to the inner circumference surface of the rotor yoke 2. First bearings 4 are inserted into the first hub 1 and bonded and fixed to the inner circumference surface of the first hub 1. A spiral groove 13 is formed in the surface of a shaft 5 by a lathe. A stator core 6 is put onto the shaft 5 and bonded and fixed to it. The first bearings 4 which are bonded and fixed to the first hub 1 are attached to the outer circumference surface of the shaft 5 and bonded and fixed to it. Second bearings 7 are attached to the outer circumference surface of the shaft 5 and bonded and fixed to it. The first hub 1 and the second bearings 7 are bonded and fixed to the inner circumference surface and the outer circumference surface of a second hub 8 respectively. A base board 9 is attached to the outer circumference surface of the shaft 5 and bonded and fixed to it. A magnetic fluid seal 10 and a magnetic fluid seal cover 11 are bonded and fixed to the inner circumference surface of the first hub 1.