School of Mechanical Engineering and Automation, Beihang University, Beijing, 10019, China.
Beijing Institute of Aerospace Control Devices, Beijing, 100853, China.
Sci Rep. 2023 Apr 11;13(1):5860. doi: 10.1038/s41598-023-33189-w.
The hemispherical dynamic pressure motor (HDPM) has the advantages of high speed, wear resistance and stability, which is widely used in inertial instruments to produce the gyroscopic effect. The ultra-thin gas film between the stator and rotor of the motor provides dynamic pressure lubrication and bearing capacity, whose dynamic characteristics determine the motor performance. However, the influence mechanism of some key factors such as ball center distance on the film characteristics is not clear, which has become the bottleneck restricting the performance improvement of HDPMs. Therefore, in this paper, a series of gas film similarity models were solved under different geometric and working parameters, and the influence law of the ball center distance, rotor displacement and stopping process on the aerodynamic characteristics was obtained, the results show that these primary parameters have significant effects on the pressure distribution, resistance moment and frictional heat of the ultra-thin gas film. This work can not only provide a theoretical basis for the aerodynamic performance optimization of HDPMs, but also serve as a reference for the design of other aerodynamic instruments.
半球形动态压力电机（HDPM）具有高速、耐磨和稳定的优点，广泛应用于惯性仪器中以产生陀螺效应。电机定子和转子之间的超薄气膜提供动压润滑和承载能力，其动力特性决定了电机的性能。然而，一些关键因素（如球心距）对膜特性的影响机制尚不清楚，这已成为限制 HDPM 性能提高的瓶颈。因此，本文在不同的几何和工作参数下求解了一系列气膜相似模型，得到了球心距、转子位移和停止过程对空气动力特性的影响规律，结果表明这些主要参数对超薄气膜的压力分布、阻力矩和摩擦热有显著影响。这项工作不仅可为 HDPM 气动性能优化提供理论依据，也可为其他气动仪器的设计提供参考。
