Along with the technical and quick development of the big power electric power electronics switch machine piece and micro-computers.Communicate an electric motor of difference changes the Frequency to adjust soon the technique has already acquired the extensive pplication.However, in industry produce actually, return a great deal of exist and don't need to adjust deeply soon of in, the big power capacity exchanges difference treads the electric motor, urgently need the problem for resolve is starts the big electric current within process impact and safeties to produce need of various protection.
Aim at to exist currently of start to equip to consume the ability big, the equipments is bulky and regulates difficulty, the price expensive etc. problem, research to manufacture a kind of have soft start compare with various sex price with protective and high movement medium, big power exchanges that the difference treads the multi-function controller of electric motor.
The article analyzed the exchanges first the difference treads the electric motor to start the function and in common use start the method, the big electric current pounds at the output reason and banes while discussing to start directly, and to in common use started the merit and shortcoming of method to carry on more analytical, then got the electrical engineering starts the process in a few problem that should consider.
Discussed a few main electric motors immediately after soft start the method and principles.
For the analytical exchanges the difference treads the electric motor to start the process and soft start the choice that the machine starts the way, the exchanges a the mathematics model of the electric motor of establishment, and really go forward to go the calculator to imitate in this foundation, carried on the exchanges that the difference treads all of the electric motor to press to get empty to carry and all press the load, the electric voltage slope to get empty to carry respectively after start the Suddenly really add load to load to start the process to imitate with the electric voltage slope.
Then start the electric voltage control method to the electrical engineering, put forward the method of the applied misty control.
Finally to soft started the concrete hardware and the software designs of the machine to carry on the elucidation of the synopsis.
Keywords: Soft starter DSP Thyristor Motor Fuzzy control Mathematics model
Matlab simulink