Key Takeaways:
Hydrodynamic bearings generate their oil film from relative motion; hydrostatic bearings are pumped up by an external supply. The difference decides stiffness, low-speed behavior, and where each belongs.
两 Ways以Make 油膜
Both 静压与hydrodynamic 轴承 use lubricating 油膜以separate surfaces, but they create it differently. A 动压轴承 relies on relative 运动的 surfaces以wedge oil into load-carrying film—no external pump为needed.

为何 静压 Differs
A 静压轴承为fed by external high-pressure pump through restrictors, so film exists even at zero speed. 该 gives it high, load-adaptive 刚度, no low-speed 爬行,与sub-micron 径向跳动 from first 回转. A 动压轴承为stiff only once it为spinning fast enough以build its wedge.
When Each Is Right
Hydrodynamic 轴承 suit high-speed, continuous-duty shafts 其中 simplicity 至关重要. 静压 轴承 suit 精度, low-speed, or frequently-started 轴 其中 刚度, 精度,与zero wear matter most—exactly domain的丸作精工 主轴与回转 tables.