卫星姿态控制飞轮轴承不同润滑状态下功耗分析

为了满足卫星姿态控制飞轮低功耗、小波纹力矩、长寿命的要求，对不同液体润滑剂润滑条件下飞轮轴承的功耗、温升变化，以及润滑脂润滑条件下不同脂用量对稳速时温升及挥发损失的影响进行了分析。实验结果表明：减少润滑剂的用量功耗和温升都小于润滑剂正常用量时；减少润滑脂的用量轴承润滑功耗更加稳定，但温升较大；高速下要考虑轴和轴承座的散热问题，以降低热平衡温度；润滑剂用量的减少导致挥发率变大，挥发寿命很短，但在真空、密闭环境中其挥发是相当小的，减少润滑剂用量是可行的。

Bearing Power Loss Analysis under Different Lubricating States for Satellite Attitude Control Flywheel

In order to meet the requirements of low power loss, smooth moment, long lile-span of bearing on satellite attitude control system, power loss and temperature rise of bearing under different lubricating condition were analyzed. Bearing temperature rise lubricated with different grease quantity when the speed of bearing is fixed, and grease volatilization loss while bearing is lubricated with reduced quantity grease were studied. Result show that the bearing performance lubricated with reduced quantity lubricant is better than lubricated with normal quantity, bearing power loss is most smooth when lubricated with reduced quantity grease, but temperature rise is high. The heat conduction should be considered in high bearing speed. The decrease of grease quantity results in high grease volatilization loss, but in vacuum, airproof environment volatilization loss can be ignored.