| 摘要 |
A dynamic pressure air bearing type electric motor includes a motor casing comprising a base having a bearing cylinder and a cover which is attached to the base to cover the bearing cylinder. A rotor assembly is enclosed in the motor casing and has a rotational shaft inserted and held in the bearing cylinder for rotation. The rotational shaft has at least one pair of herringbone grooves formed in the outer circumferential face. A bearing gap is defined between the rotational shaft and the inner circumferential face. A bearing gap is defined between the rotational shaft and the inner circumference of the bearing cylinder. The base has an air flow path formed therein. Upon rotation of the rotor assembly, air is caused to flow through the bearing gap axially along the rotational shaft. An air circulating path is formed in the motor casing so that the air is circulated through the bearing gap, the air flow path in the motor casing, and a gap between a mounting member and the outer circumference of the bearing cylinder.
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