The impeller (1) is rotated from the crankshaft and it converts the mechanical Power from the crankshaft into kinetic Power by putting the fluid in motion. The stator sends the fluid returning from the turbine for the pump. This improves the performance in the torque converter. Take note the spline, https://torqueconverterclutch17384.bloggin-ads.com/57468378/the-fact-about-torque-converter-clutch-that-no-one-is-suggesting