Design And Optimize Of Fractional-Slot Concentrated-Windings Permanent Magnet Synchronous Motor And Temperature Compensation For Torque

As the oil and other resources to reduce, automobile manufactures around the world are turning to develop the new energy vehicles, it makes the direction of the vehicles to the electric power. The drive motor is the main component of the car, the performance of the drive motor is directly related with the stand or fall of new energy vehicles running. The end of Fractional-slot concentrated windings motor has the characteristics of small size, small axial length, copper consumption, high efficiency, high power density. It can be made into a block structure. The heat will generate during motor running process, the temperature of motor will rise. The rising temperature causes demagnetization of the permanent magnet and the incerase of resistance of the stator. At the same time, the air gap flux density, no-load EMF and the external characteristics of motor will be influenced.The main work of paper is as follows:(1) In this paper, a 20kW interior permanent magnet synchronous machine (IPMSM) with 24slots and 16poles is as the research object. This paper analyzes the influence to EMF, cogging torque, tripple torque and the motor electric external characteristics of different magnetic structure. And the different magnetic structures are optimized according to the above results. In this paper, the shape and size of permanent magnet are optimized according to compare the performance of the motor. The slit width adjustment, changing Arc coefficent and the matching of the slot size are taken to optimize the cogging torque. Finally, the optimal dimensions of the slot is defined which can make the cogging torque down. In order to improve the performance of motor and decrease the ripple torque, the space position of permanent magnet is optimized.(2) The temperature of stator windings and magnet are both rising during the motor running. The performance of the motor:no-load EMF, flux permanent magnet motor, radial magnetic density, the output torque of the motor are influenced by the rising temperature. So a new kind of controller is designed to compensate torque loss. Based on the basic mathematical model of motor, the compensation control strategy is realized. According to track speed, the expression of the voltages of d and q axes can be deduced. In the Matlab/Simulink the simulation model of temperature compensation is established, the simulation results show that the new controller can compensate the torque loss which caused by temperature.