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为解决大功率立式高速储能飞轮下支承高负荷高损耗问题,采用在飞轮上端轴向永磁轴承卸载的技术方案。以尺寸最小、卸载力达到飞轮重力(1kN)的80%为目标,磁路估算与有限元精算相结合,设计了一种磁路漏磁微小的内外双永磁静环与合金钢导磁转环组合的新型轴向卸载磁轴承。磁轴承的转动部件使用合金钢导磁材料,可适应500r/s、200℃工况需要。建立了永磁轴承卸载力测试装置,测量结果与有限元计算结果相吻合,在工作间隙1.5mm时,磁轴承卸载力达860N,轴承径向刚度为3.07kN/m。该卸载方案在旋转试验中收效良好,280r/s升降速过程中下支承温升始终处于正常范围。
In order to solve the problem of high load and high loss under the high-power vertical high-speed energy storage flywheel, the technical scheme of unloading the axial permanent magnet bearing at the upper end of the flywheel is adopted. With the smallest size and unloading force reaching 80% of the flywheel gravity (1kN), the magnetic circuit estimation and finite element actuarial are combined to design a magnetic flux leakage magnetic ring Ring combination of new axial unloading magnetic bearings. Rotating components of magnetic bearings using alloy steel magnetic material can be adapted to 500r / s, 200 ℃ conditions needed. The test device of unloading force of permanent magnet bearing was established. The measured result is consistent with the finite element calculation. The unloading force of magnetic bearing is 860N and the radial stiffness of bearing is 3.07kN / m when working gap is 1.5mm. The unloading scheme works well in the rotation test, and the lower support temperature rise during the 280r / s up and down process is always within the normal range.