With an external motor-diameter of only 20 mm and a length of 57 mm, the power to volume ratio of the Series 2057…B is excellent. The motor uses the “System Faulhaber” skewed winding in combination with a rotor made of neodymium rare-earth magnets to provide cog-free motion. Due to their electronic commutation, the service life of these motors is only limited by the bearings. The brushless DC motor can achieve a continuous output torque up to 18 mNm at speeds up to 58,000 rpm. The brushless DC motor comes in a sterilizable version capable of withstanding an autoclave environment.