Induction motor vector control

Due to the limitations of DC speed and the superiority of AC speed control, as well as the continuous development of computer technology and power electronic devices, asynchronous motor frequency control technology is rapidly developing. After nearly 10 years of application development, AC asynchronous motor frequency control performance has been comparable with the DC speed control system.

At present, a wide range of research and application of asynchronous motor frequency control technology with constant voltage ratio control, vector control, direct torque control. In this paper, the use of asynchronous motor vector control speed control technology, with fast dynamic response, low speed performance and wide speed range and so on.

The vector control idea is to control the AC motor model equivalent to the DC motor model. Using the coordinate transformation theory, the nonlinear and strongly coupled AC motor model is decoupled and the AC motor stator current vector is decomposed into two components: the excitation current component , Torque current component. By controlling the two vectors separately, the control of the magnetic field and the torque is realized separately.

In this paper, a rotational speed and magnetic field closed-loop vector control system with torque inner loop is designed. The dynamic response capability of the system is fast and the anti-interference ability is strong. The torque inner loop helps to improve the decoupling performance of the speed and the closed-loop control system.

Simulation software is used to simulate the vector control system using MATLAB software SIMULINK. The simulation results show the rationality of the design.