The zero-bias current controlled way is proposed to cut down the power consumption of the active magnetic bearing in a power magnetically levitated spindle system. The zero-bias current controlled way is easier to realize than the zero-bias flux controlled way, since current can be detected directly, while flux is hard to be measured in practice. Besides, the active magnetic bearing suffers from lumped uncertainty including parameter uncertainty and external load, and the displacement of rotor caused by lumped uncertainty is undesirable. In practice, the upper bound of the lumped uncertainty especially the external load is hard to obtain, making it hard to choose parameters for a traditional sliding mode control. The adaptive backstepping sliding mode control method combining both the advantages of sliding mode procedure and backstepping procedure is proposed to solve this problem. Furthermore, the upper bound of lumped uncertainty is estimated in real time by an adaptive law. In this paper, first a new zero-bias current active magnetic bearing system model with lumped uncertainty is built; then two controllers based on the sliding mode control and adaptive backstepping sliding mode control methods are designed, respectively, and the stability analyses are given for the two controllers via Lyapunov function; finally, the effectiveness of the proposed adaptive backstepping sliding mode control approach for a zero-bias current active magnetic bearing system is verified by the simulation and experiment results.
Vernier permanent magnet (VPM) machines are obtaining more and more attentions due to their high torque density and low torque ripple in recent years. However, they suffer from low power factor compared with conventional PM machines. In this paper, a triple-rotor axial-flux spoke-array vernier permanent magnet (TR-AFSAVPM) machine is proposed to improve the power factor of conventional VPM machines to a reasonable level as well as maintaining high torque density and adequate speed range. Both Quasi-3D finite element Analysis (FEA) and 3D-FEA are employed to investigate the performances, such as power factor, torque density and torque ripple of the proposed machine.
Keywords-high power factor; torque density; quasi-3D FEA; vernier machineI.
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