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Study On Permanent Magnet Synchronous Motor Drive System In Electric Vehicle Application

Posted on:2004-10-11Degree:DoctorType:Dissertation
Country:ChinaCandidate:J Q XuFull Text:PDF
GTID:1102360122965000Subject:Motor and electrical appliances
Abstract/Summary:PDF Full Text Request
This dissertation is devoted to the study on permanent magnet synchronous motor (PMSM) drive system in electric vehicle (EV) application aided by the State "863 Plan" and the Science and Technology Items of Liaoning province. Four parts are included as follows:First of all, an efficiency-optimization control strategy for PMSM system used in EV is presented in order to extend road haul per charge. In view of the operation characters of PMSM for EV application, a novel efficiency-optimization control strategy is presented to meet the demand of rapidity after analyzing the defect of efficiency- optimization control strategy of PMSM system with minimum input power in ordinary application. On the basis of ordinary efficiency-optimization control strategy with minimum input power, the new strategy adopts fuzzy logic control method and torque compensation strategy to accelerate convergence in process of optimizing controlled parameter. Results of experiment indicate the validity of the efficiency-optimization strategy.The design methods of PMSM used in EV are studied in the second part. Parameters design rules of PMSM in EV application are presented. The influence of PMSM parameters on EV operation is analyzed and selection rules of PMSM rotor structure are determined. The field-circuit coupled design method of PMSM is studied considering the EV drive demands. In order to enhance performance in low-speed, strategy of shunts switch is analyzed in detail. Then, a 7.5kW PMSM prototype for a lightweight electric vehicle is designed and manufactured.The third part developed a lightweight electric vehicle prototype. A DSP-based full-digital vector control inverter for PMSM used in EV is developed, and the design method of hardware and software is presented. Experiments of the whole system including PMSM and inverter are done. Then a lightweight electric vehicle prototype driven by the PMSM system is developed.Finally, direct torque control (DTC) strategy for PMSM in EV application is studied and DTC system is also developed. On the detailed analysis of PMSM DTC principle, the function of zero voltage vector and the choice method of voltage vector in EV driving are proposed. Restricted condition about stator flux linkage under DTC is analyzed. Afterwards, control rules on stator flux linkage reference are given, then an efficiency-optimization method for PMSM system under DTC is presented. Afuzzy-DTC method is applied to improve the dynamic performance of EV. Simulation results of EV system show that PMSM system under DTC is able to meet the needs of EV driving. Furthermore, a DTC PMSM system for EV is developed.
Keywords/Search Tags:electric vehicle (EV), permanent magnet synchronous motor (PMSM), vector control, Efficiency-optimization, field-circuit coupled design, simulation, direct torque control (DTC)
PDF Full Text Request
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