# Motor driver > Electronics that supply power to a robot's motors; it determines how fast and precisely each axis can move. Also known as: motor drivers. Category: Hardware. A motor driver is the power electronics between a control unit and a motor. It converts control signals into the currents that move the motor, so its power and precision determine the dynamics of each axis of a robot. ## How PhotoRobot uses it PhotoRobot designs its motor drivers in-house. Apart from mobile devices, its machines use a 48 V motor supply, the highest safe voltage level, with nominal currents of 5 to 15 A per phase depending on the generation, to deliver as much power as possible to each robotically controlled axis. ## See on photorobot.com - [PhotoRobot motor drivers](https://www.photorobot.com/driver) ## Related terms - [Control unit](https://www.photorobot.com/glossary/control-unit): The computer inside or beside every PhotoRobot that drives its motors, triggers cameras and connects it to the network. - [Rotary encoder](https://www.photorobot.com/glossary/rotary-encoder): A sensor that reports the exact angular position of a rotating part, such as a turntable plate. ## Where this term appears on photorobot.com Mentioned on 1 page. Most relevant: - [PhotoRobot Motor Drivers - Technical Documentation](https://www.photorobot.com/driver): The table in the upcoming section shows the basic specifications of the motor drivers used by PhotoRobot.