API 40 Air-cooled Eddy Current Brake for Dynamometer Torque(at 50r/min) 50000N·M Drilling Depth(With 4‑1/2" Drill Pipe) 4000m Working Principle Induction Eddy‑Current Braking Coil Quantity 4 Rated Resistance per Coil(20℃) 7.6Ω±10%Ω Coil Insulation Class Class H Excitation Current 37A DC Excitation Power 10KW Required Cooling Air Volume 6000m³/h Max. Air Outlet Temperature(Inlet Air Temp. 42℃) 72℃ Weight 6100kg