Fan-cooled magnetic particle brakes from Placid Industries (Lake Placid, NY) incorporate an electrically powered fan fastened directly to the brake. The fan cools the brake by blowing ambient air over the outside and into the vent holes. The moving air lowers the temperature of the brake and increases heat dissipation ratings. A threaded port accepts compressed air to increase heat dissipation up to 1,900 Watts. Rated brake torque is from 4 to 300 lb-feet. Wide tension ranges are possible since output torque can be varied from 3 to 100% of rated torque. Controlling input DC current varies load torque, and torque is independent of slip RPM. The brakes can be used to produce adjustable soft stops.
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