Model 57BL01 57BL02 57BL03 57BL04 57BL05 57BL06 Number of poles 4 Number of Phase 3 Rated Voltage VDC 24 Rated Speed RPM 2500 3000 3000 3000 3000 3000 Hording Torque N-m 0.057 0.11 0.165 0.22 0.33 0.44 Output Voltage Watts 15 34 52 69 103 138 Peak Torque N-m 0.18 0.38 0.58 0.8 1.2 1.6 Peak Current Amps 2.7 6.8 10.0 13.2 19.8 25.8 Line to Line Resistance Ohms 3.6 1.2 0.9 0.65 0.5 0.35 Line to Line Inductance mH 2.6 2.2 1.3 1.1 0.6 0.5 Torque Constant N-m/Amps 0.074 0.059 0.06 0.062 0.062 0.063 Bakc EMF V/kRPM 7.75 6.2 6.3 6.5 6.5 6.6 Rotor Ineria g•cm2 32 42 58 72 106 140 Body Length (L) mm 37 47 57 67 87 107 Weight kg 0.43 0．5 0.67 0.75 1.0 1.25