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Description
As we all know, the motor equipped with hybrid magnetic bearings (HMB) is easier to get higher speed and higher power because HMB not only has the advantages of no friction and wear, but also has the advantages of high suspension force density and low power consumption. Therefore, HMB has important application value, especially in the field of high-speed direct drive. Until now, domestic and foreign scholars have researched three kinds of mainstream HMBs, namely three-pole HMB and six-pole HMB driven by one AC converter, four-pole DC HMB electrified by two bipolar DC switching amplifiers. Of course, the above three HMBs can achieve stable suspension of the rotor. Therefore, from the perspective of industrial application, it is necessary to comprehensively evaluate the detailed electromagnetic performances of the three HMBs. Therefore, in this paper, starting from the analysis of structure, magnetic circuit and suspension mechanism, we compared the mathematical model of suspension force and the maximum bearing capacity. In the case of the same volume, air gap length, axial length, sum of pole areas, and air gap bias flux density, the three kinds of analysis models are established, respectively. Then, the suspension force characteristics, coupling characteristics, power consumption and maximum bearing capacity of the three HMBs are compared in detail. Furthermore, the other advantages and disadvantages of the three kinds of HMBs are further investigated, which provides an important reference for the correct selection and design of HMB.
