Reduction of torque undulation and extension of the Park’s transformation applied to non-sinusoidal saturated synchronous motors

This paper present the principle of an extended field oriented control. This control strategy follows from an extension of the Park’s transformation, suitable for non-sine synchronous motors with salient poles. In particular, we highlight that the structure of the classical field oriented control is kept in the case of non-sine motors provided minor modifications. The presented method allows to regulate constant values in steady state while applying non-sine currents to the motor. The shape of these non-sine currents is predetermined so as to minimise the steady state torque undulation.