| 摘要 |
PURPOSE:To reduce the weight of rotary section by molding a rotary member integrally with a core member, made of ferrous material and having shape corresponding to a magnetic circuit, and an insert diecast section made of aluminum material. CONSTITUTION:A rotary hub 21 comprises a rotary hub press section 22 and a rotary hub diecast section 23 formed through die casting. The rotary hub press section 22 comprises a protruding section 22A and a disc section 22B having a skirt section, formed integrally of an iron board through press, contacting with bearings 9, 10. The rotary hub press section 22 is inserted into the rotary hub diecast section 23 cast of aluminum material. An annular magnet 15 is stuck onto the rotary hub press section 22 of the rotary hub 21 thus effectively constituting a magnetic circuit required for rotation of a motor 20. Consequently, a motor where the weight of the rotary section can be reduced through simple arrangement is realized. |
