Vector Control of an Induction Motor for Speed Regulation

Abstract

In electric motor drives, speed regulation plays an essential part in describing the overall performance of the system drive. To control the motor speed of an Induction motor (IM), an indirect vector control method is implemented in this paper. Scalar control is a simple and effective technique, but it responds slowly to transients and is unsatisfactory for regulating motors with dynamic behavior. The currents are controlled via the field-oriented control (FOC) approach, allowing for quick reactions. This approach meets the demands of dynamic drives, wherein quick response is required. The flux location is calculated indirectly in indirect control methods by rotor speed and slip calculation. The indirect control technique has grown in popularity due to the lack of rotor flux position sensors and the capacity to work at low speeds. A PI controller is utilized in the speed controller to control the motor torque by producing quadrature-axis current reference iq*. The motor's flux is controlled by direct axis current reference id*. The IM is operated by a current-controlled PWM inverter. The designed model is simulated using MATLAB and the results show an accurate speed response of the IM motor.