Study And Design On Control Strategy Of Permanent Magnet Synchronous Motor In Hybrid Electric Vehicle

The Hybrid Electric Vehicle (HEV), which is considered a new Energy-saving product of automotive industry to solve the problem of energy and environment, becomes international and national focus. The drive motor being a main component of HEV plays an important part. The Permanent Magnet Synchronous Motor (PMSM), which has high efficiency, high power density and good timing performance, becomes the first choice for the HEV drive motor. So, the research on the computer control system of PMSM has a high theoretical and practical significance.This subject originates from the preliminary study of Hybrid Electric Vehicle Project of China First Automotive Works (FAW) R&D Center, assisting FAW R&D Center to research, develop and improve the Hybrid Electric Vehicle motor controller, as well as control strategies proposed by the software.First of all, the subject elaborates energy crisis and environmental pollution, which are the problems the current conventional vehicles are facing, and introduces types of new energy-saving HEV, then analyzes the advantages of PMSM according to demand for HEV working conditions. Secondly, the basic mathematical model and electromagnetic relationship of PMSM in different coordinate systems is derived, which provides a theoretical basis for the discussion and analysis of different control strategies. The subject emphatically analyzes and compares Current Control Strategy of four control methods including id=0, MTPA, cosφ=1 and Constant Magnetic Flux. Besides, the subject gave a detailed explanation on the field-weakening control when the PMSM working above the base speed, including common field-weakening control, maximum input power field-weakening control and MTPV field-weakening control. According to HEV in different working conditions, it is concluded that we take MTPA control below the base speed, oppositely field-weakening control above the base speed.Topic, at last, introduces hardware and software implementation, mainly hardware module diagram and software algorithm diagram, also a simple test for the experiment platform of PMSM. At the end of the paper, we have the whole of this topic summarized and also make prospects for the next phase of the project.