Research On The Control System Of Linear Induction Motor

Linear motor is a kind of equipment for converting electrical energy into linear movement use. In most occasions where need converting rotary movement into linear movement, linear motor shows its superiority. It makes many in-between transferring machines unnecessary. Therefore, the whole system runs more steadily. In addition, thanks to the reducing of the in-between machine, the friction wastage of the whole system is reduced and the efficiency of the whole system is improved. Hence, the usage of the linear motor has a good foreground in the areas of traffic, industry, national defence and so on.In the first part, looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor,In the second part, the dynamic vertical end effect of linear motor is analyzed, which causes eddy current loss and air gap flux decrease. An equivalent circuit model in the rotor flux oriented frame is developed for the vector control of LIM by adding the end erect function. The simulation results show the improvements achieved by the proposed scheme. An intelligent control strategy, incremental PI speed controller based on single neuron, is presented, which can be regarded as the adaptive nonlinear controller and can achieve more satisfactory performance than traditional PID controllers.In the third part, as a new control theory for motor control, DTC has many merits. This paper constructed the mathematic model of linear induction motor for DTC control.The results demonstrated that the DTC for LIM is feasible and simple.In the last part, the vector control experiment hardware system based on DSP is constructed.And with program language C, every module in the system and the controlling arithmetic are constructed.