| 摘要 |
PURPOSE:To improve the durability of a moor and prevent transferred liquid from pollution by disposing respectively a spiral groove, dynamic pressure thrust and radial bearings between a rotor and an impeller of the motor and a spiral groove and a dynamic pressure radial bearing at the side of rotor opposite to the impeller. CONSTITUTION:While a motor is provided with a rotor 1 and a stator 2, an impeller 4 is secured fixedly to an end of a spindle 3. While a thrust bearing 11 and a radial bearing 12 are disposed between the rotor 1 and impeller 4, a radial bearing 13 is disposed at the extreme end of rotor 1 on the side opposite to the impeller 4 side. The respective radial bearings 12, 13 are inserted into ceramic shaft sleeves 16, 17 formed on the surface with spiral groove. Also, the thrust bearing 11 formed of ceramic sintered body as the fixed side thrust support plate is disposed between a pair of rotary disks 21, 23 made of ceramic sintered body as the rotary side thrust support plate.
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