Motor Controller
Electronics that convert a digital command signal into power currents/voltages that drive a motor. Robot motor controllers implement: commutation (BLDC), current control (torque), velocity control, and position control loops. EtherCAT servo drives (Elmo, Kollmorgen) and integrated smart servos (Dynamixel, HEBI) are common in research robots.
See this in practice: the hardware store →
HardwareElectronicsControl