Performance analysis of a new concentratedwinding interior permanent magnet synchronous machine under Field Oriented Control

This paper analyzes the performance of a new fractional-slot, concentrated-winding (FSCW) Interior Permanent Magnet Synchronous Machines (IPMSM) under Field Oriented Control (FOC). The FSCW IPMSM is being developed vigorously in recent years because of its high-power density, high efficiency, wide field-weakening capability, and high fault tolerance compared to the distributed-wound IPMSMs. The major disadvantage of concentrated winding is often cited to be its non-sinusoidal stator MMF. However, using appropriate combination of slots and poles, nearly sinusoidal EMF and very low cogging torque can be achieved. Although steady-state performance such as efficiency and constant power speed range of this type of PM machines have recently been published, dynamic performances have yet not been reported. The FOC scheme which rely on the machine model, were applied to a prototype a 14-pole/ 18-slot, double layer concentrated-wound IPM machine. The dq model for distributed wound IPMSM was used for the control. This paper investigates performances of the test machine in terms of torque and current ripple, transient responses for the step variations of speed and load under maximum torque per ampere and field weakening control regimes. The experimental results on the concentrated winding IPM machine indicate that the distributed windng dq model is not sufficiently accurate to harness the full capability of the new machine.