The invention relates to an optimal control method for polygonal flux linkage locus production, including the steps: a conventional regular hexagonal flux linkage locus is subdivided and each side of the regular hexagon extends in six possible directions to develop into five sides, thus forming a flux linkage locus with thirty sides. The optimal control method adopts a DSP event manager to realize optimal control to the flux linkage locus, including the steps: the period value of the timer of the event manager is fixed on, and the values of the comparand registers of a comparison unit are determined according to the switching sequence required by the flux linkage locus with thirty sides and the period value of the timer; each sector applies two comparison outputs, only one comparison output is used during one period of the timer and each time the compassion output required is fixed on by a different sector. The optimal control method reduces torque ripples during the rotation of the motor and the working frequency can reach 300Hz; the method is applicable in high-speed frequency conversion and is simple to control and is of strong universality.