High Quality Torque for Five-Phase Open-End Winding Non-sinusoidal PMSM Drives

This paper presents a novel control scheme using the well-known field-oriented control (FOC) technique and a simple adaptive linear neuron (Adaline) to obtain smooth torque with a five-phase open-end winding non-sinusoidal permanent magnet synchronous machine (PMSM). For a given supply voltage value, the open-end winding structure results in higher allowable phase voltages, leading to a higher maximum rotating speed. Compared to a sinusoidal back electromotive force (back-EMF), a non-sinusoidal back-EMF leads to lower manufacturing costs and higher torque density. Nevertheless, unexpected current harmonics and torque ripples are consequently generated by the harmonics in back-EMFs, reducing control quality of the electric drive. In this study, the Adaline-FOC-based control scheme is proposed to eliminate the unwanted current harmonics and especially the torque ripples for a high-quality torque machine drive. Numerical results are presented to prove the effectiveness of the proposed scheme.