A board that emulates a BLDC motor and battery, so motor-controller firmware (like an Electronic Speed Controller) can run in CI without hardware. The device under test drives its power stage into dummy inductors. A 200 kHz emulator bridge on the same bus injects modeled back-EMF. An iCE40 FPGA runs the motor model and outputs Hall and encoder signals. A programmable supply with a brake chopper emulates the battery, including sag and regen, from 2S to 13S. Isolated delta-sigma current sensing, hardware overcurrent latching. The boards are stackable, so you can stack up to four motors for a 4-in-1 ESC or a full quad.