IPMSM FieldWeakening region control strategyto improve DC voltage utilization
                                                                            DING GuoMing1, LI SuFang2
(1.College of Information Engineering, Henan Vocational College of Agriculture, Zhengzhou 451450, China;2.Mechanical Engineering Institute, Luoyang Institute of Science and Technology, Luoyang 471023, China)

Abstract: In order to solve the problem of improving the DC voltage utilization rate of the interior permanent magnet synchronous motor (IPMSM) driving system in fieldweakening region, an IPMSM fieldweakening region control strategy was designed to maximize the DC voltage utilization. The intersection between the voltage hexagonal boundary of the IPMSM driving system and the IPMSM torque curve were calculated, and the equation of the voltage hexagon of the IPMSM driving system was derived. The IPMSM driving system voltage hexagonal boundary is a function of rotor position, so the voltage vector angle was calculated from the intersection for controller design. Feedback from the daxis current to the voltage angle was also designed to reduce torque ripple. The new control strategy was tested using the IPMSM driving test platform. The research results show that the new control scheme can effectively improve the system output voltage and reduce the current, increase the DC voltage utilization rate, and improve the efficiency of the IPMSM driving system.

Key words: interior permanent magnet synchronous machine(IPMSM); torque control; field weakening control; direct current voltage utilization