The improvement of induction motor efficiency using a TRIAC control system (Thai)

Abstract

Nowadays, energy saving is an effective method for cost reduction in industrial plants. Induction motors are commonly found in these plants and they work as torque generators for machines. The induction motor has become popular because it is easily operated and maintained. When the motor works normally at normal line voltage, losses in the motor are mainly caused by excess line voltage. The excess line voltage makes the motors consume more current than usual and results in losses. The experimental results show that energy saving can be achieved when the motors work at a line voltage level lower than the rated value. This paper proposes an energy saving device called Power Save (PS) for induction motors. Induction motors should be operated at the nominal voltage level of 340 volts to consume minimum energy. The induction motorís voltage is controlled using TRIACs at 50 Hz. The experimental results show that the efficiency of the induction motors is improved and there is at least 10 % saving of energy.