With an external motor-diameter of only 12 mm and a length of 24 mm, the power to volume ratio of the Series 1224…SR is impressive. This is achieved through a combination of the “System Faulhaber” ironless rotor and Neodymium rare earth magnets to achieve a stall torque of 5.43 mNm and speeds of up to 13,800 rpm. The precious metal commutation allows operation at low starting voltages due to inherent low contact resistance. The 1.5-mm diameter motor shaft ensures high rotational stability. The housing of the motor is black to facilitate optimum heat dissipation.