This paper describes the principle of field orientation-a new closed-loop control method for rotating-field machines.

In an induction motor field orientation vector control system,the rotor time constant may be deviated due to motor temperature variation and flux saturation.

In this paper, the asynchronous motor rotator field-orientation system which used forward-feed de-couple control method is studied, based on discussing implementation scheme which aims at high power AC motor drive control.

This paper passes on the current control concept in the field-orientation control of induction motor drives presents recently current control techniques, reviews emphatically PWM current controllers.

There is a new point of view in rotor field-orientation.

In order to attenuating the effect of rotor resistance variety and torque disturbance caused by ocean current and surf on the speed-regulation system of the electric propulsion motor in a deep submergence vehicle (DSV), a method is studied that employs state feedback robust control to deal with the vector control of propulsive induction motor problem under the magnetic field oriented condition.

Simulation of field-oriented induction motor control system based on Matlab;

Rotor field-oriented decouples not only flux linkage and torque but also TEMF and MEMF in rotor.

In the triple loops of control system,two PI controllers are adopted in the speed and position loop,a stator field-oriented vector controller is adopted in the current loop in order to control the torque instantaneous.

By studying multi variable,strong coupling,nonlinear and time varying parameter system of induction motor and based on the transformation of coordinate and flux orientation, the mathematic model of induction motor is derived.

Based on the transformation of coordinate and flux orientation, the mathematical model of induction motor is derived.

The veracity of rotor flux orientation is also improved though the speed estimation.