The impeller (1) is rotated from the crankshaft and it converts the mechanical Strength on the crankshaft into kinetic Strength by Placing the fluid in motion. In the torque converter you will discover a minimum of three rotating aspects: the impeller, which can be mechanically pushed through the prime mover; https://torque-converter-clutch20740.thelateblog.com/34482998/details-fiction-and-torque-converter-clutch