The Design On Driven System Of Permanent Magnet Synchronous Motor Applied On Electric Vehicles

With the rapid development of automobile industry, the consumption ofconventional energy is exacerbating, however, the energy on Earth is limited, all thepeople is facing a serious energy shortage. China’s energy problem has become astrategic issue of national economic development. From a national securityperspective, national security, economic development is closely linked to the oilresources and stable supply of energy is the focus of a country, but also the core ofChina’s energy security strategyt. Convenience to the people at the same time, the caralso pollutes the environment, with the improvement of living standards, humansbegin to pay attention to the living enviroment, and require to reduce the vehicleexhaust. Facing to the energy shortage and environmental pollution, development ofelectric vehicles has become a main trend in the development of the automotiveindustry.The main content of this paper is the research and implementtation to the drivensystem of permanent magnet synchronous motor applied on electric vehicles. For thespecial requirements of wide speed range of electric vehicle, this paper presents aflux-weakening control based on leading angle, and influence of motor parameters onthe performance of flux-weakening control is theoretically analyzed.Firstly,this paper presents a control of maximum torque per ampere(MTPAC)whenthe speed of the motor below the rated speed,and take full advantage of the reluctancetorque of the the interior permanent magnet synchronous motor(IPMSM).this programimproves the entire control algorithm, aslo the operating efficiency and stability ofthe entire driven control system; above the rated speed, the use of a flux-weakeningcontrol based on leading angle. Weakening control principle based on the currentadvance angle control, to recalculate the d, q-axis current of the maximum torque perampere to obtain higher speed by taking advantage of the bus voltage of the inverterDC side, the operating range of the whole control system is to broaden, and constanttorque mode transferre smoothly and stably to the constant power field weakeningmode.Finally, this paper designs a hardware platform of the weaking control of the theinterior permanent magnet motor(IPMSM)based on electric car project of Guizhouaerospace Electric Co., Ltd. In the hardware design,this paper briefly introduces thefunctions of TMS320F2812chip,the selection of the IGBT module, the sampling of voltage and current, and the design of IGBT driven module. This paper designs asoftware program based on this platform,and gives the flow chart of the softwareprogram.