| Electrical drive is an electromechanical system that converts electrical energy into mechanical energy or converts mechanical energy into electrical energy.The electric motor is a key part of the electric drive.In recent years,the most important control strategies for electric drives are direct torque control and vector control,and both methods have their own advantages and disadvantages.Both electric drive technology and motor technology have been developed,but there are still deficiencies.This paper first introduces the development status and development trend of electric drive systems,and the composition of electric drive systems.An axial laminated anisotropy(ALA)rotor synchronous reluctance motor was selected as the system control object.The reason for choosing an ALA rotor synchronous reluctance motor is explained.In order to simplify the analysis process,some assumptions were made and the mathematical model of the synchronous reluctance motor was established and simulated by Matlab/Simulink.Secondly,for the synchronous reluctance motor running in extreme environment,the mechanical sensor can not accurately obtain the rotor position problem.A method for detecting the rotor position angle of synchronous reluctance motor based on PWM current differential is designed.The inverter adopts a three-phase triangular carrier PWM modulation method to estimate the rotor position by deriving the carrier frequency current differential expression.Simulation was performed using Matlab/Simulink.Finally,aiming at the shortcomings of flux linkage and torque ripple in the direct torque control system of synchronous reluctance motor,a direct torque and flux control(DTFC)method based on expected voltage vector is designed to control the synchronous reluctance.The motor,and a space vector modulation(SVM)PWM inverter is used to power the synchronous reluctance motor to form a complete sensorless transmission system.The control system was simulated using Matlab/Simulink. |
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