Influence of Inoculation and Texture on Enhancing Electrical Conductivity in Commercially Pure Aluminum for Squirrel-Cage Asynchronous Electrical Motors

Abstract: This research focuses on manufacturing and applying highly conductive and non-magnetic aluminum-based materials in rotor construction to reduce conductor losses and increase motor efficiency. The process involves using an electric melting furnace to melt aluminum-boron (Al-B) master alloys at various rates along with 99.7% pure Al and impurities. During melting, the boron reacts with impurity elements in the Al, forming borides that are removed as slag. This interaction removes impurities, eliminating the magnetic properties of the Al and increasing its conductivity. The melted metal is then cast and subjected to heat treatment to achieve desired textures in their structure, further enhancing conductivity in specific directions. The outcome of this study is the production of extra-high-conductivity and non-magnetic materials through an innovative approach that does not require system changes or increase costs compared to current methods. The Al-3B master alloy and heat treatments significantly improve electrical conductivity in aluminum by enhancing metal orientation to (110) and eliminating structural defects. Heat treatments at 400 °C for 2 and 4 hours are most effective. These processes also reduce magnetic characteristics, resulting in improved rotor efficiencies in motor performance.