چكيده به لاتين
Abstract:
An important part of the electric propulsion system in electric vehicles is permanent magnetic synchronous machines that are widely used due to high torque density, high power density and high efficiency. Permanent magnet synchronous motors with internal magnets are more attractive than surface magnet type due to the better use of magnets and the wider range of constant speed - power. The IPMSM performance is greatly influenced by the magnet configuration in the rotor and improved by improvement the rotor design. The proper design of the height, width, and location of the magnets on the rotor, as well as the shape and size of the flux barrier around them, can be considered as a design goal for better motor performance, especially at speeds beyond the rated speed that is required for electric vehicles.
The purpose of this thesis is to improve the structure of the internal permanent magnet synchrotron motor with three different magnets arrangement for using in electric vehicles. First, each structure was simulated separately, and then the dimensions and position of the magnets, as well as the shape and dimensions of the flux barrier at the end of the magnets were changed to obtain a structure with the lowest cogging torque and torque ripple. The performance of the motor was compared with the three mentioned magnets arrangement at two operating points, the rated conditions at 750 rpm speed and in the constant power region at 2250 rpm speed. Comparison of the results showed that the structure with segmented rectangular magnets had the least volume of magnets used in its structure and it produce the least cogging torque, in addition, the motor with a rectangular arrangement has the lowest torque ripple at both points of operation. Finally, the demagnetization effects of magnet for all three structures were investigated and it was found that structures with rectangular and V-shaped magnets are resistant to demagnetization.
Keywords: Internal permanent magnet synchronous motor, V-shaped magnets, rectangular magnets, segmented rectangular magnets, cogging torque, torque ripple, irreversible demagnetization
