| Summary: | 碩士 === 清雲科技大學 === 電機工程研究所 === 96 === This paper presents an improved induction motor constant V/f control method capable of operation at low speeds. In order to maintain the air gap flux at its rated value to develop rated torque at any frequency, the stator resistance voltage drop compensation and slip frequency compensation are needed. In this paper, the direct and quadrature component of the stator current in the stator voltage oriented reference frame is calculated to implement the vector compensation for stator resistant drop. The slip frequency compensation is based on linear relationship between slip and torque. In order to reduce the speed steady-state error of the motor, a sliding-mode controller is included in the overall control system.
To verify the effectiveness of the proposed method, A simulation verification work is done by MATLAB/Simulink software. Then, a digital signal processor(eZdsp TMS320- LF2407A) based experimental system is developed testing the performances of the drive system. The experimental results, show that good steady and transient response, both in no-load and loading conditions, are obtained by the proposed method.
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