Performance comparison between concentrated and distributed wound IPM machines used for field weakening applications

Distributed windings have been the winding of choice in IPM machines over the past decades. However recent studies have shown the benefits of applying concentrated windings in terms of increasing the power density of the machine as well as the field weakening performance. This paper states and addresses issues with the application of concentrated windings and compares its field weakening performance to equally sized IPM machines distributed windings. In this paper the authors show the extent of torque density increase, field weakening range increase as well as a comparison of machine characteristics such as cogging torque and efficiency.