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An investigation of electromagnetic performance on fractional-slot PM Brushless Machines which slot-number and pole-number differs by one using 2-D finite-element analysis is presented. The investigation is motivated by the rise of Unbalanced Magnetic Force (UMF) resulted by asymmetric disposition of phase windings. It can be seen that a significant reduction of UMF is possibly achieved by employing...
This paper presents investigation of electromagnetic performances such as open-circuit flux-density, back-EMF and output torque on two fractional-slot PM brushless machines. Their ratios of slot-number to pole number are similar respectively, i.e. one with slot-number to pole number is differ by one and the other differs by two. Theirs main parameters such as split-ratio, axial length as well as rated...
This paper looks in detail at a fault tolerant machine for direct drive application. The machine considered is a high pole number, concentrated wound machine developed for a safety critical aerospace application. The machine is designed to have a high p.u. inductance to limit short circuit current and negligible mutual inductance to have decoupled phase windings. Single and double layer winding configurations...
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