Application of concentrated windings in interior permanent magnet machine

The use of concentrated windings in the interior permanent magnet (IPM) machine reduces its axial length and increases high-speed performance by enhancing flux- weakening capability although at the expense of higher cogging torque, decrease in winding factor and saliency ratio. In order to take full advantage of the concentrated winding in the IPM machine, optimization is required to minimize cogging torque and to maximize winding factor and saliency ratio. This paper is part of a detail investigation in which authors will attempt to optimize the concentrated winding structure for a high performance IPM machine. The full review of the existing optimization technologies for the concentrated winding applied to the permanent magnet machine is the first step toward developing new methods for the IPM machine. The paper presents the study of the various optimization techniques of the concentrated winding and their suitability in context with the IPM machine.