An evaluation of concentrated and distributed windings in interior PM and claw pole motors

This paper describes a method to compare the relative merits of a concentrated and a distributed winding motor. Before the comparison, recent developments of coil manufacturing process for the both winding topologies are reviewed in order to assume appropriate copper fill factor in the comparison. A same frame size and a same rotor model are used in the comparison and only the coil winding topologies are different. The results show the advantages of distributed winding and concentrated winding change with not only motor core length but also output torque density. Another comparison between concentrated winding and distributed winding with a new type claw pole motor is also presented which is expected to be a rare-earth free motor topology.