Operating region and maximum attainable speed of energy-efficient control methods of interior permanent-magnet synchronous motors

摘要

In this study, maximum attainable speed of different control methods of interior permanent-magnet synchronous motors (IPMSMs) is investigated. According to importance of loss reduction in constant power region, investigation of maximum attainable speed of energy-efficient control methods has a great importance. Inherent field weakening of these methods leads to increment of maximum attainable speed on the constant power curve in comparison with other methods such as id = 0. Therefore, inherent field-weakening property of energy-efficient control methods is utilised to extend efficient performance of these methods to above the base speed. In this study, maximum torque per ampere (MTPA) and loss-minimisation control methods are compared with method of id = 0 in terms of maximum attainable speed and operating region in constant power region. MTPA and loss-minimisation control methods are efficient in minimising the copper loss and total loss, respectively. Also, loss and efficiency of these methods are compared with each other in constant power region considering saturation and iron loss resistance variation. Also, operating regions of three control methods are obtained in constant power region by an experimental process. Furthermore, experimental results verify calculation and simulation results of maximum attainable speed and operating region of different methods.