碩士 國立交通大學 電機與控制工程系 88 This thesis deals with the problem of using sliding mode technique to control and observethe states of an induction motor.We hope to directly regulate the rotor torque and the square of the rotor flux magnitude to the desired value. Nonlinear sliding surfaces are chosen and stator voltages are derived such that the state trajectories have a sliding mode behavior for driving system to achieve the control objective. Since in practice the rotor fluxes are hard to measure, a sliding mode observer is used to estimate the rotor fluxes.Moreover, we use a MARC speed controller to control the rotor speed. Computer simulations in this thesis are performed using C language.Hardware implementation is based on a PC(Personal Computer) and relative circuits. Finally, experimental results are presented to show the superiority of the proposed theory and the accuracy of the software and hardware design for the experimental system.