Realization of Maximum Torque per Ampere Control for IPMSM Based on Inductance Segmentation

Abstract

In order to solve problems associated with inductance parameter changes on traditional maximum torque per ampere (MTPA) control method for interior permanent magnet synchronous motor, such as large amount of computation, complicated control system, and low control precision, an MTPA control method based on inductance segmentation is proposed. Considering the effects of magnetic saturation, the inductance parameters are processed by segmentation analysis. The Newton iteration method is used to solve the correspondence between the electromagnetic torque and the optimum ${d}$ – ${q}$ axis current components, and the subsection curve is fitted to achieve MTPA control. By analyzing and processing inductance parameters, this control method improves the accuracy of control system. The ${d}$ – ${q}$ axis current reference is realized by piecewise curve fitting to improve the dynamic performance of the system. Finally, the dynamic performance of this method is compared with that of the traditional method through simulation and experiment. The simulations and experiments results show that this method has the advantages of fast dynamic response, high control accuracy, and simple implementation.

Keywords

• IPMSM
• MTPA
• magnetic saturation
• inductance segmentation