| 摘要 |
PROBLEM TO BE SOLVED: To facilitate assembly and to prevent axial loss from increasing regardless of the increase in a screw diameter by sealing a motor shaft to a fitting hole that is provided coaxially with a magnet rotor and making smaller the diameter of the magnet rotor shaft than the outer diameter of the motor shaft including a screw part. SOLUTION: In a cylindrical magnet rotor 6 where an outer-periphery surface is subjected to multiple-pole magnetization, a projecting part 6a for composing a bearing part is formed integrally at one end part, and a fitting hole 6b where the end of a motor shaft 1 is forced in is formed at the other end part. The magnet rotor 6 and the motor shaft 1 are integrated rotatably while being fitted. Since the projecting part 6a of the magnet rotor 6 is used as one bearing of the motor shaft 1 and a normal middle bearing needs not be used, the diameter (the axial diameter of the magnet rotor) of the projecting part 6a can be set without depending on the size of the diameter of the screw 1a of the motor shaft 1, so that it can be set smaller than the diameter of the screw 1a.
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