Frequency Control System, Dsp-based Vector Control

It is the real time-processing properties of silicon, such as the TMS320F240 DSP controller, the accurate asynchronous motor model and all kinds of advanced theories that have resulted in the development of a highly reliable drive with highly accurate and variable speed controls.Field Oriented Control (FOC) is one of the advanced theories, which is based on motor unification principle, energy conversion and vector coordinate transformation theory. It has many advantages such as novelty, practicability and advancement. By transforming the model of AC motor to DC motor, the stator current is decomposed into two DC parts which are orientated towards the rotator magnetic field and controlled respectively. Thus the magnetic flux and torque are decoupled. In which way, It controls the asynchronous motor in a synchronous way.Using digital signal processor (DSP), TMS320F240, which is special for motor control, we develop a suit of speed adjustable, reliable and highly effective induction drive based on FOC principle. Realization of the whole hardware and the whole software is described. At the same time, a new Pulse Width Modulation (PWM) named Space Vector Pulse Width Modulation (SVPWM) method is introduced which is more effective.