| With the gradually worsening issues of air contamination, global warming and oilresources crisis, the future development mainstream of auto industry will undoubtedly defineas low-carbon, emission reduction, energy-efficient and environmental conservation. Inaddition to furthering technical renovation to heighten the energy-efficient effect ofconventional vehicles, the development of green new energy vehicles has become the onlyeffective approach in automotive industry. Pure Electric Vehicle (PEV) has been widespreadconcern worldwide, by reason of its outstanding energy-efficient potential and advantages oftechnology, cost, industrialization and other aspects. It is of great importance to enhancetechnology level and performance of PEV, which not only puts forward more technicalissues and requirements for governments and auto companies to be addressed and overcome,but also proposes the market demand for PEV technology R&D and industrialization goals.Traction motor of PEV is used as vehicle power source, which is one of the corecomponents of PEV, as well as an important component of PEV technology R&D. Withadvantages of relatively high power factor and efficiency, Permanent Magnet SynchronousMotor (PMSM) has been used to any appreciable extent, while PMSM complies with thedevelopment trend of efficient motor drive technology requirements. Traction motorparameters matching not only has a major impact on dynamic performance and economicperformance of PEV, but also serves as technical interface for drive control strategies.Parameters matching is a critical technique for OEMs and motor component suppliers,because the study of motor body performance and structure design is not comprehensive, theOEMs can not completely put forward technical specifications of traction motor based onvehicle capability. Relying on the requirements of the863Program “The Design andTechnical Development of FAW New Structure Small Pure Electric Vehicle”(No. 2011AA11A219), and by combining efforts with FAW Technology Group Corporation R&DCenter, this paper conducts research work on PEV traction motor parameters matching,including proposing explicit technical specifications. The textual and primary researchcoverage of this paper is as follows:1. By reading related literature and technical investigation, the research actuality ofPEV traction motor applications, parameters matching and the characteristics of tractionmotor both here and abroad is presented and studied, motor parameters matching of thispaper is defined as technical interfaces for vehicle performance requirements and vehiclecontrol, simultaneously the current problem of motor product performance "demand"inconsistent with "supply" of OEMs is proposed, the specific significance of parametersmatching is also explained.2. According to actual driving need of PEV, static and dynamic properties requirementsof traction motor are proposed. The static properties of PMSM includes externalcharacteristics, efficiency characteristics, part-load characteristics and temperature risecharacteristics, and dynamic properties consist of speed dynamic response characteristicsand torque dynamic response characteristics. Systematically study the characteristics andlaws of motor combining theoretical analysis and experimental research, illustrate motorparametrical requirements of static and dynamic properties, as well as analyze experimentalvalidation of motor performance. The peak parameters scopes are defined by calculatingdynamic indicators. The ranges of rated motor parameters are determined with analysis ofPEV driving cycle conditions. Based upon studies above, motor parameters are matchedthrough the application of genetic algorithm, which was best to fulfill the requirements ofvehicle performance.3. According to matched motor parameters, the design implementation issue of motorshould be studied. Parameters of motor stator and winding, rotor and permanent magnet arethe main structural parameters, apply OPPeD ePMSM software to conduct parametricanalysis of related factors of motor static and dynamic properties, conclude the influence ofmain body structural parameters on motor performance, consequently establish the relationship between PEV performance requirements and main body structural parameters oftraction motor.Meanwhile, with the guidance of theoretical analysis of motor structural parameters,complete preliminary design and optimization design. The external characteristics and basespeed of the motor are ensured in preliminary design, but it is required to optimize the designbecause of the larger torque ripple. By ensuring the existing characteristics, optimum designis on the basis of original design, it means to reduce losses and motor torque ripple andobtain the external characteristics parameters, rating parameters and higher efficiency, whichcan satisfy requirements of parameters matching, verify that the matched motor can bedesigned to achieve matching parameters.4. In order to verify the enhancement of economic performance level of vehiclematched motor parameters, build a forward PEV model in Matlab/Simulink simulationenvironment, including vehicle drive control strategy model. Input electric motor modulewith parameters and characteristics of the motor which have been obtained in optimizationdesign, and control strategy of the accelerator pedal characteristics is modified according tothe parameters and performance of traction motor. Offline simulation of vehicle energyconsumption under several driving cycle conditions is completed, compared with the initialmotor used in vehicle model, simulation results show that this matched motor parameters canbetter ensure vehicle economic performance and improve economy performance to someextent, the average energy consumption of one hundred kilometers under several cycleconditions has been reduced, and distribution of electric motor operating point falls into therange of the ratio of high-efficiency increases. |
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