Research On Mathematical Models And Control Strategies Of Novel Dual-Stator Flux-Modulated Motor

Electric vehicles(EVs),especially public transport,have gradually entered into people's life through long-term in-depth theoretical explorations and mature experimental studies.While,there are still many problems during the transformation from public to personal transport for EVs.For example,volume of current transaction motors was too big and power density was low,which caused high cost and low efficiency.Therefore,a novel dual-stator flux-modulated motor(DSFMM)with higher power density,higher reliability,and lower cost with no permanent magnet is investigated and its control strategies for the application of EVs are proposed and presented in this paper,the main tasks are as follows:Firstly,this paper introduces structure of DSFMM,analyzes its operating principle,derives its inverse air gap function and winding function,and establishes its mathematical models under natural and rotating frames.During the derivation,contents about formulas of the two windings are explained and specific relationships among electric angles of primary winding current,secondary winding current,and rotor are verified by the following experiment.Secondly,stator-current-oriented vector control(SCOVC)is investigated and presented based on complete mathematical model of DSFMM.In order to control the two winding currents independently,the control strategy suggests that equations of the two stator windings should be oriented to two rotating frames with different rotating angular velocities.Moreover,two control systems with different excitations,direct current(DC)and alternating current(AC),are fully analyzed and developed to meet the requirements of various operating conditions.Finally,simulation studies of the proposed DC and AC excitation control system are implemented including responses of the motor for speed variation,load torque variation and so on.Corresponding experiment studies are carried out on a custom-made DSFMM prototype under diverse operating modes.The proposed SCOVC of DSFMM,which are strongly validated by complete simulation and experimental studies,serve a basis on theory and experiment research for more applications of flux-modulated motors to EVs,and have a certain popularization value.