Research on Torque Distribution Function Method for DSEM Based on H-Bridge Converter

The traditional control strategies for doubly salient electro-magnetic motor (DSEM) have problems such as large torque ripple, low current utilization, and difficulty in commutation during operation. To address these problems, a torque distribution function (TDF) control method based on H-bridge converter is proposed by this paper, which reduces the commutation area by three-phase independent chopping and increases the motor output by using the TDF combined with torque closed loop to suppress torque ripple. Firstly, the advantages of the proposed method in improving torque performance are analyzed according to the basic theory of DSEM, the principle of torque distribution is proposed, and the TDF is derived by combining the actual nonlinear back electromotive force (EMF) curve. Then, the existence of a better torque distribution ratio is demonstrated and the calculation formula is derived with the aim of improving the torque-ampere ratio. Finally, the TDF method was verified to be effective in suppressing torque ripple and increasing motor output by an 18/12-pole DSEM experimental platform.