An extended dq model for concentrated-wound interior permanent magnet machines considering non-ideal machine parameters

Abstract

In the conventional dq model of permanent magnet machines, machine parameters are assumed sinusoidal, leading to a smooth calculated output torque. This is justifiable in distributed-wound stators. However, in permanent magnet machines with concentrated-wound stators, the assumption of sinusoidal machine parameters is no longer valid. Therefore, an extended dq model is proposed in this paper for machines with non-sinusoidal parameters. A detailed torque equation is also derived that explains different sources of torque ripple. Tests are introduced for determination of the parameters in the proposed model. Experimental results from a prototype concentrated-wound interior permanent magnet machine are used for validation of the proposed extended dq model.