![]() ![]() In, the magnetic forces and the coupling between the different axes of CRAMB was analyzed and verified by means of finite element method (FEM). However, in the literature, fewer researchers discussed the specific design method of CRAMB.įor a MB with one DoF, the bias flux density is often designed as half of the saturation magnetic flux density of core material. However, those structures were not suitable for producing the large axial force application. The three DOFs MBs without a large disk rotor were proposed. That structure was configured with secondary air-gap in the axial bearing to separate the bias flux and control flux. In, a novel structure for three DOFs hybrid MB was designed. For decreasing flux leakage, key design parameters were optimised. In, an equivalent magnetic circuit model including a magnetic flux leakage of a CRAMB was built. The performance of the CRAMB was verified by experimental results. The effect of eddy currents has been considered. In, dynamic modelling of the CRAMB based on the equivalent magnetic circuit method was presented. The author used additional coils to produce the opposite direction flux for compensation. In, the decoupling method for CRAMB was proposed. In, the coupling effects on stiffness were analysed based on the dynamic stiffness models for a CRAMB. The force coupling of a CRAMB was designed and analysed with a coupling factor. ![]() In, further studies on the coupling problem of the CRAMB have been conducted. Based on the comparison with that of separated MBs, it was found that the coupling problem of the CRAMB is more serious than that of separated MBs. Since the CRAMB with a conical rotor was proposed in the 1990s, more and more literature focus on the research of the CRAMB, mainly including coupling properties, dynamic modelling, magnetic field analysis, and novel structures. For reducing the cost, size, and saving energy and increasing power density, combined radial–axial MB (CRAMB) becomes a good choice for a high speed motor. Usually, one axial bearing and two radial bearings are used to realise five degrees of freedom (DOFs) suspension. It has been widely applied in many areas. Therefore, it has a lot of many advantages, such as no contact, no friction, no lubrication, low noise, active control and so on. Magnetic bearing (MB) is used to realise rotor's non-contact suspension by magnetic force. ![]()
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