非叠片转子-电磁轴承系统磁场计算

Analysis of Fields and Forces for Active Magnetic Bearing with Unlaminated Rotating Rotor

分析了非叠片转子 -电磁轴承系统的磁场力 ,给出了磁场分布模型及磁浮力和切向力的计算公式 ,并以实际电磁轴承为例 ,进行了相应计算 .结果表明 ,实例计算结果与理论分析一致 .

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, the unlaminated rotor is utilized in a large rotor AMB system. Eddy currents are caused inside the rotor when an unlaminated rotor rotates in a radial magnetic bearing. They 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 unlaminated 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 the theoretical analysis.