Abstract
To reduce the volume, axial length and cost, a radial three-pole five-degree-of-freedom (5-DOF) integrated hybrid magnetic bearing (HMB) is studied, which the rotor can be levitated stably in one unit. Firstly, the configuration and suspension principle are introduced. The mathematical models of suspension forces are deduced by the magnetic circuit analysis. Then, according to radial and axial bearing capacity, the design method of main parameters is given. Finally, the magnetic circuit, suspension mechanism, air gap flux density, force-current relationships are calculated and analyzed by three-dimensional finite element method. The research results have shown that the structure of the 5-DOF integrated HMB is reasonable, and the suspension mechanism, mathematical model and design method are correct.
Highlights
According to the producing mechanism of the levitation force, Magnetic bearing (MB) can be divided into active magnetic bearings (AMBs), passive magnetic bearings (PMBs) and hybrid magnetic bearings (HMBs)
Compared with AMBs and PMBs, only when the rotor deviates from the balance position, the HMB generate suspension force to pull the rotor back to the balance position
In order to achieve rotor 5-DOF stable suspension, several independent axial 1-DOF HMBs units, radial 2-DOF HMBs units, radial-axial 3-DPF HMBs units and one high-speed motor unit are necessary to constitute 5-DOF complete magnetic levitated high speed motor system. This magnetic levitated high-speed motor has long axial length, low critical speed, low levitation force density and power density and the difficulty of coordinated control among multiple units, which limits the technical advantages of magnetic levitation motor
Summary
Magnetic bearing (MB) is a new type of electromagnetic device with the advantages of no friction, no wear, no lubrication, low loss, high precision, and long service life. According to the producing mechanism of the levitation force, MBs can be divided into active magnetic bearings (AMBs), passive magnetic bearings (PMBs) and hybrid magnetic bearings (HMBs). In order to achieve rotor 5-DOF stable suspension, several independent axial 1-DOF HMBs units, radial 2-DOF HMBs units, radial-axial 3-DPF HMBs units and one high-speed motor unit are necessary to constitute 5-DOF complete magnetic levitated high speed motor system. This magnetic levitated high-speed motor has long axial length, low critical speed, low levitation force density and power density and the difficulty of coordinated control among multiple units, which limits the technical advantages of magnetic levitation motor.. A novel 5-DOF integrated 3-pole AC-DC HMB is proposed to reduce the cost, axial length, volume and increase the critical speed, suspension force density of the 5-DOF magnetic suspension support system.
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