Research On MTPA Control Of Interior Permanent Magnet Synchronous Motor Based On FOC

The fast-growing automobile industry consumes a large amount of fossil fuels,causing serious environmental pollution.China had paid more and more attention to the development of new energy vehicles in recent years.New energy vehicles do not use fossil fuels and are clean and free of pollution.There is still much room for improvement in the development of new energy vehicles,mainly in the areas of electric drive systems,batteries,and intelligence.New energy vehicles mainly refer to electric vehicles.Electric vehicles generally use permanent magnet synchronous motors as traction motors.Aiming at the characteristics of the interior permanent magnet syschronous motor,this paper studies the MTPA control strategy of the interior permanent magnet synchronous motor based on FOC.This can improve the efficiency of the motor drive system of electric vehicles.The principle and design process of the current regulator were analyzed.The advantages and disadvantages of different current decoupling methods were compared.Finally,the current controller with a combination of an internal mode controller and a sliding mode controller with better adjustment effect was selected.Several implementation methods of MTPA control were studied.The search method was selected finally after comparing the advantages and disadvantages of various methods.The search method was improved.The particle swarm optimization algorithm was used to optimize the search method.The second-order polynomial fitting method was used to calculate the approximate value of the optimal torque angle.Approximate torque angle was used as particles.The position change range and the flying speed of the particles are set according to the variable range of the torque angle and the magnitude of the torque pulsation.Wait for the stator current to stabilize before iterating until the number of iterations or error requirements were met.Particle swarm optimization improves the speed and accuracy of the search.And this method has low torque ripple.The traditional MTPA control strategy does not involve the field weakening area.This topic studies the use of MTPA control in a part of the field weakening area.The output torque was met when the output voltage of the inverter reaches the limit value.The stator current was minimized.The feasibility of the MTPA control strategy was proved using MATLAB for simulation.The hardware circuit of the motor controller was designed and debugged.Testing on the dynamometer verified the feasibility of the proposed MTPA control strategy.