Hybrid magnetic bearing

Increase of energy efficiency and decrease of weight-size parameters is an important problem for improvement of magnetic bearings. Using of permanent magnets on base of rare earth metals is promising direction for improvement of consumer properties of magnetic bearings. In a paper some questions of integrate of permanent magnets in a radial magnetic bearing for rotor weight offsetting was considered. Simple mathematical model that link carrying capacity with pole dimensions was consider. The dimensions poles of a hybrid magnetic bearing in identical external size was calculation by using proposed policy. Hereafter magnetic field was researched by means of numerical simulation for traditional and hybrid magnetic bearings and traction performance depending on control current was founded for various location of rotor. Analytical calculation and numerical simulation demonstrate that traction force creating by permanent magnets offset of rotor weight in full but traction force creating by electromagnets full provide operating traction force. Installations of permanent magnets render possible decrease of magneto motive force of control poles, size of a coil and finally, increase of energy efficiency of a magnetic bearing. Using of permanent magnets essentially action on traction performance of a magnetic bearing. Operating point was displaced in mean region of traction performance curve. In results all coil of electromagnets happened in equal terms on temperature. Considered properties of a hybrid magnetic bearing may have to influence on a dynamic performance of a control system positive.