实心转子—电磁轴承系统的损耗分析

当径向电磁轴承中的转子旋转时,转子中将产生涡流。当转子为非叠片结构时,所产生的涡流较大,此涡流将改变电磁轴承气隙回路中的磁场。因此,作用在转子上的磁场力除磁浮力之外,还将作用有切向力,此切向力将产生磁阻尼,引起能量损耗。本文提出了一实心转子—电磁轴承系统的磁场分布模型,给出了相应磁浮力和切向力的计算公式,以实际系统为例,进行了相应计算和损耗分析,并在实际系统上进行了实验。结果表明计算与实验较吻合。 

Rotating Loss Analysis for Active Magnetic Bearing with Solid Rotating Rotor

Active magnetic bearing (AMB) is widely applied in many industrial fields.When the rotor becomes larger and larger,it is more difficult to manufacture a laminated rotor.Hence,solid rotor is utilized in the large rotor AMB system.Eddy currents are caused inside the rotor when a solid rotor rotates in a radial magnetic bearing.The eddy currents change the magnetic field of the radial magnetic bearing and,therefore,the forces on the rotor include not only the levitation force but also the tangential force.The tangential force causes magnetic damping and losses.This paper presents a magnetic field analytical model of magnetic bearing solid rotor system, and the forces and losses within a practical AMB system are calculated.It is shown that the calculation results are in good agreement with those of experimental study.