Induction motor control system based on FOC algorithm

In today's increasingly severe energy crisis, new energy vehicles have zero emissions, high efficiency, environmentally friendly features are sought after by people, influenced by policies and future market trends, the development of a highly efficient, versatile motor control It is particularly important. In this paper, the mathematical model of the high-power asynchronous motor of new energy vehicles is constructed. Analysis of its control principle, By analyzing the mathematical model of the three-wire AC asynchronous motor under the three-phase static coordinates, the three-phase coordinate system of the motor is decoupled into a two-phase rotating coordinate system similar to the DC motor by using the Clark transform Park variation mathematical formula. By detecting the phase current, the torque component and the excitation component of the motor are used in the above method, and the magnetic flux observer of the motor is designed by the method of magnetic field orientation. Based on the FOC field oriented control algorithm, TI's TMS320F28035 high-performance digital signal processor has developed an efficient and versatile induction motor control system with a speed loop and a current loop double closed loop. Controls the A/D to sample the voltage and current of the controller and build its current model. The real-time speed of the motor is detected using the incremental photoelectric encoder M/T method. The DSP-enhanced PWM (EPWM) module is used to generate high-precision flexible space vector pulse width modulation (SVPWM) signals, which greatly improves the control efficiency and speed range of the motor. By downloading the prepared control software to the controller hardware platform, the signal output test and the motor load test show that the controlled motor runs smoothly, the speed is stable, the corresponding speed is fast, and the parameters can be easily modified to adapt different motors, which saves the cost and development cycle for the enterprise.