Development of a Single-Phase Fully Controlled Rectifier for 2 HP DC Motor Applications

Abstract

Speed control of DC motors is among the simplest compared to other motor types. However, traditional control methods, such as using an autotransformer, are still widely employed today. As is well known, autotransformer configurations have significant drawbacks. Chief among these are economic issues: damaged autotransformers are costly, difficult to repair, and expensive to replace. To address this challenge, a controlled rectifier utilizing the TCA 785 IC is employed to regulate the firing angle of thyristors driving the DC motor. The TCA 785 IC offers ease of control and simplified repair processes if the device malfunctions. This system is designed to regulate the voltage on the armature winding using a fully controlled rectifier with a maximum output voltage of 190 VDC. The device employs the TCA 785 IC to set the thyristor firing angle and deliver the resulting voltage to the motor’s armature winding. As a result, the DC motor operates without current surges during voltage increments. Furthermore, the motor is coupled to a three-phase synchronous generator, which achieves the desired rotation speed (1000 rpm). By connecting incandescent lamps to the three-phase generator output, a load simulation is performed for the DC motor. This project aligns with community empowerment goals, particularly in advancing technical education and practical skills development. By offering an innovative yet cost-effective alternative to traditional motor control systems, the device contributes to increasing accessibility for small industries and vocational training centers. These benefits relevant for community service programs aimed at fostering local technical expertise and economic resilience.