An electric motor is soft to start
the research and the design of control the system
Abstract: This text introduced an electric motor of big and medium-sized difference soft the concept and the movement principles that start, elaborated the programmable preface controller( PLC) technique in an electric motor of big and medium-sized difference softly start automatic control of application and its superiority, and give concrete implement way.Adopt the PLC namely to turn in an electrical engineering of cage by establish the electric voltage in the sub- back track regulate type can the electric leakage, A/ D, the D/ A conversion mold piece, the electric power electronics equip, the PID regulates etc. to constitute together a set of to start the system to carry out the control to carry on soft start, thus attain the purpose of protect the electric motor.Mostly principle namely the electrical engineering start because of establishing the adjustable electricity, starting the electric current smaller.Start to regulate to equip to regulate the control electric voltage of the adjustable electricity anti- through a PLC in the process, the electricity anti- that make lets up to zeroth gradually, electrical engineering from start the appearance steady transfer the normal movement appearance to retreat the adjustable electricity bypass again a movement, the electrical engineering starts the process to complete.In addition, this text aim at currently existent circumstance in changing the frequency machine to output to cut over the problem, try from the technique and economies the practical angle set out, cutting over the problem to carry on the analysis and studies towards changing the frequency machine synchronously.
Keyword: The programmable preface controller(PLC) ; Motor; Soft-starting; Changing frequency machine ; Inverter Output switching