| Aiming at the aging situation of the tank gear box testing system in a tank manufacturing enterprise,by which the quality of assembled tank gear boxes could be tested. After the designs of gear box testing system at home and abroad were consulted,the control technology of AC motor and DC motor and how to coordinate them was considered,a new gearbox testing system which is able to adapt the production processes better is designed.In the testing system,one induction motor for simulating the tank engineer and two separately excited DC motors for simulating the tank travelling load are used. Because of the tank gearbox is a typical gear driving structure,the vector control technology is adopted. The mathematical model of induction motor is considered to be a higher-order,non-linear and strong-coupling multi-variables system,the disadvantage of vector control of incomplete decoupling is inevitable,and when the gearbox working at different stall, the model of control system will be changed, so the fuzzy control technology is increased into the control strategy to improve the steady-state performance.Different quantification factors and scale factors of the fuzzy controller are provided, according the requested speed to improve the dynamic performance of control system. Finally,a controller about how to coordinate induction motor and DC motor is made,in this controller, the vector control technology and the parameters self-adjusting fuzzy algorithm is combined. Based on this control algorithm,the gearbox testing system is designedIn this design,the vector controller function of Siemens 6SE70 frequency convertor for controlling the induction motor is adopted,the 315-2DP PLC is used to achieve the parameters self-adjusting function of fuzzy control,the data exchange among PROFIBUS-DP stations is realized via PROFIBUS industry bus,as well as,a gear controller for automatically gears adjusting is designed.The feasibility and correctness is confirmed by the excellent performance of the gearbox testing system,and the testing system satisfies the production requirement very well. |
