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Multiphase machines are superior to three-phase machines with high reliability and large power capability. In the post-fault operation when one phase of an induction machine is open circuit, model predictive control has been proved to have rapid current, torque and speed response. However, the mathematical model in post-fault operations of multiphase permanent magnet (PM) machines is quite different...
This paper investigated and compared two types of modified model predictive control methods with finite set for six-phase PMSM MTPA control. The first one has conventional cascaded speed and current controller loops where the PI current loop is replaced with a MPC control loop. The second method uses one MPC controller in place of conventional cascaded loops for both speed and current control. The...
This paper introduces three indexes for the cogging torque waveform and analyzes the influence of machine parameters on these three indexes in the theory. The phase of cogging torque under different combinations of slot opening ratio and pole-arc ratio is analyzed. Based on this analysis, two techniques to minimize cogging torque of the axial-flux permanent-magnet (AFPM) machines are proposed and...
Variable flux machines utilizing low coercive-force magnet material Alnico have attracted many attentions due to its features of variable flux controllability which can obtain a wide speed range and high efficiency at the entire speed range. However, since the remnant magnetism of Alnico is always lower than rear-earth magnets, leading to a lower torque output. A hybrid permanent magnet variable-flux...
This paper mainly proposes a method to improve torque density and reduce magnetization current of a variable- flux flux-intensifying interior permanent magnet machine (VFI-IPM) which utilizes low coercive-force magnet material AlNiCo. Since the d-axis inductance is higher than q-axis inductance in the VFI-IPM and the saliency ratio is not that high as conventional IPM machine, the reluctance torque...
Stator DC winding Excited Vernier Reluctance Machines (DC-VRMs) are a kind of novel machines, which are investigated more and more owing to absence of expensive permanent magnet material. However, DC-VRMs are found to have large torque ripple if they are not carefully designed. There are a lot of existing methods to reduce the cogging torque in permanent magnet (PM) machines, but the design techniques...
Ni nanowires (NWs) are driven in water using a rotating magnetic field. The NWs show various locomotion performances under different boundary conditions. Pure rotation occurs when the two ends of the NWs are homogenously constrained. However, if the boundary conditions are different at the two ends of the NWs, tumbling motion, i.e., rotation plus translation, will be generated, which leads to the...
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