Slip Frequency Controlled Type of Vector Control of Induction Motor Using Flux Observer

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Vector control has made it possible to control the instantaneous torque of an induction motor and is widely used in various industrial areas. The vector control will be classified into two types according to a selection of the co-ordinate system for the model of the induction motor. A synchronously rotating co-ordinate system is used for the well-known slip frequency controlled type of vector control. A stationary co-ordinate system is used for the flux observer based vector control. In this research, new flux observers based vector control systems are proposed and discussed by using both co-ordinate systems.Principal results obtained by this work are as follows;1.System analysis : The steady-state performance is analyzed and discussed. In order to analyze the robust stability, a linear model is proposed taking into account the machine parameter change. By using this model, the trajectories of poles and zeros of the torque transfer function are computed and discussed.2.Experimental system : The digital signal processor (TMS320C30) is used for the implementation of the control system. Two kinds of softwares are developed. One is an observer based vector control program written in the DSP assembly language and the other is a monitoring program written in C language.3.Computed and experiment result : The experimental results show good agreement with the conputed ones. It is confirmed that the proposed method improves the robustness comparing with the conventional one.4.Sensorless vector control : By using a full order observer, new vector control system in which the estimation of speed and resistances are possible is developed.