Two brackets, made from 2″ aluminum angle profile, hold 50-size brushless outrunner motors rated at 100 A each. The brackets are bolted to a 0.5″ polycarbonate base, and the motor shafts are connected via a flexible coupler. Contact plates are mounted next to each motor—this makes it easy to swap out a motor if one burns out. High-current wires are soldered to the female contacts. I’m using double wires to increase current-carrying capacity and to allow monitoring half the current with my 50 A current probe.

I tested the load using my prototype BLDC controller and was very pleased with the results. The testing process is documented in this short video—check it out!