Dia. 52mm Brushless DC Motor Both external controller and integrated electronics are optional ... 3 phase and 4P/3 phaseNo-loading speed: 4,600, 3,500 and 4,400rpmRated power: 108, 90 and 110WRated speed ... : 4,000, 2,800 and 3,900rpmRated current: 1.2A, (AC) 5.1A and 6.2ARated torque ... : 0.26, 0.31 and 0.27Nm 52mm Brushless DC Motor