Design, Analysis And Control Of An Interior Permanent Magnet Synchronous Motor With Fractional-Slot Concentrated Windings

With the increasing energy shortage and worsening environment conditions of the world, traditional automobiles using internal combustion engines are facing the more and more serious challenge, hence, new energy vehicles have become the inexorable trend of social development. Hybrid electric vehicles(HEVs), which are the most reasonable and feasible option at present, have caught extensive attention for their distinct advantages such as high fuel economy, long travelled distance and low exhaust emission, and developed rapidly. In this thesis, a type of interior permanent magnet synchronous motor used in HEVs was studied primarily. Its design scheme was systematically elaborated and then the electromagnetic property and heating condition of the motor were analyzed with the help of FEA calculation software. In the end, the optimal control strategy of the motor was put forward based on simulation research. The main work and research achievements of this thesis are listed specifically as follows:1. Detailed designing scheme was given about this machine, which mainly including essential size design, rotor magnetic structure design, selection of pole and slot combination, armature winding distribution and size calculation of the permanent magnets etc..2. By means of the finite element analysis software(ANSYS), the 2-D finite element model was constructed, and based on the model, air-gap field, flux linkage, back emf, winding inductance, steady torque and location torque were calculated and analyzed. On this basis, a 10 KW prototype was designed and built for experimentation study, the experimental results shows that the simulation calculation and analysis are correct.3. Calculation and analysis of the 2-D thermal field model over whole motor was made, and on that basis, key factors influence the motor’s temperature rising were discussed considering both heat production and dissipation, providing theoretical foundation for the motor’s design optimization and security application.4. In the whole speed range, simulation model of the speed control system for this motor was established using Matlab/Simulink based on its mathematical model and electromagnetic property data get from the finite element calculation. Below the base speed, Id=0 control and MTPA control were studied comparatively by simulation; above the base speed, MTPA control was successfully switched to flux-weakening control, and then the flux-weakening control was analyzed primarily later.