Electric Vehicle PMSM Without Speed Sensor Vector Drive System

Permanent magnet synchronous motor with high power factor, excellent efficiency, size,lightweight, stable and reliable operation and high torque inertia ratio, etc., are particularlysuitable as an electric vehicle drive motor. High-performance permanent magnet synchronousmotor position and speed requirements obtain the rotor speed changes. The traditionalapproach requires speed detection rotor shaft of the motor with a speed sensor, which not onlyadds system size and cost, but also susceptible to the environment. Therefore, through thecurrent and voltage measurements to calculate the motor stator side to determine the locationand speed of the rotor, and effectively improve the speed sensor inconvenience of electricvehicles PMSM speed sensorless vector drive system.First, a detailed study of the structure and composition with the electric vehicle electricdrive system, analyzing the performance requirements of the electric drive system, based onthis parameter determines the electric vehicle drive motor parameters, gear ratio parametersand cell parameters. Meanwhile, the study of the mathematical model of PMSM and typicalequation.Secondly, a detailed study of the model reference adaptive speed identification system,and according to Popov (popov) ultra-stable design adaptive rate theory. Join in on rotor fieldoriented vector control study on the basis of the simulation model reference adaptive speedidentification module and load, load, sudden and draw speed contrast, current, torquereduction sudden load change under different conditions curve. Experimental results showthat the model reference adaptive speed identification have a fast dynamic response, goodspeed, and good stability followed.Then, DSP TMS320F2812chip as the control of electric vehicles PMSM drive systemhardware and software design. The design of hardware includes a drive circuit, current,voltage sampling circuit protection circuit, reset circuit, level conversion circuit, serialcommunication circuit, JTAG interface circuit, and man-machine interface circuitry. Softwaredesign, including DSP, SVPWM initialization procedure, the motor speed estimation routines,ideas and the corresponding speed regulation system subroutine interface design, A/Dsampling procedures and the upper and lower machine communication.Finally, the full text of the study are summarized accordingly, based on the modelreference adaptive speed identification of electric vehicle drive system of permanent magnetsynchronous motor speed fast response, high control accuracy, strong anti-interference abilityto achieve a high-performance motor drive system.