Improving Thermal withstanding Capacity of Single Phase Induction Motor using NWCC Method

Single phase induction motors are extensively used for smaller loads in industries and domestic purposes due to their various technical as well as economical advantages. Temperature rise due to heat dissipation caused by various losses inside the motor is a critical factor which degrades the dielectric properties of insulation and shortening the lifespan of motor. This paper presents the capillary based water cooling method of single phase squirrel cage induction motor. In this method, a jacket of capillaries made of jute and cotton is used as an outer cover for the motor casing. A small air gap passage is provided in between motor casing and inner surface of jacket. Natural Water Cooling Capillaries (NWCC) method is used to lower down the surrounding temperature of motor which reduces thermal limitations of motor. For this purpose we select a 0.37 kW single phase, 50Hz squirrel cage induction motor. Heat run test is performed to determine the total loss of energy dissipated as heat on single phase squirrel cage induction motor with and without adopting capillary based water cooling method. Comparison is done on the basis of experimental result which shows that the temperature withstanding capacity of induction motor will increase by 10.67 % after adopting capillary based water cooling method. This is an economical method and no external energy is required for cooling purpose.