B-7V & B-20V Dimensions & Specifications Model Rated Torque lb-ft N-m Heat Dissipation at 600 rpm of Outer Member (Watts) NonExcited Drag Torque Inertia (WR2) of Rotating Members lb-ft N-m lb-ft2 kg-m2 lb kg Rated Current Ω@ 20˚C Current Torque Coil Data (90 VDC) Weight Time Constants (Seconds) B-7V 7 9.5 79 .40 .54 .002 .000084 7 3 .36 162 .09 .10 B-20V 20 27.1 132 2.0 2.7 .013 .00057 19 9 .20 290 .25 .25 The time in seconds for current or torque to reach 63% of the final value after step function voltage is applied. "Rated current" is the current which will occur from a 90 VDC input to the clutch when the unit is operated at its rated temperature (maximum heat dissipation). Non excited drag torque and torque time constant measured at 500 rpm. Brake mounting should be 'floating' type, to prevent overloading bearings. Non excited drag torque values represent a typical unit after a few minutes of use. Drag torque in a new, unused unit may initially be higher. Coil Voltage B7V and B20V are 90VDC models B7VS1 and B20VS6 are 24VDC models, and are CE Magnetic Particle Clutches & Brakes 129 Magnetic Particle Clutches & Brakes Specifications