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Multiple pallet are conveyed on a roller conveyor. The conveyor motor is "across the line" started and friction is the only stopping force when the motor is turned off. The stopping distance for the maximum load is about 30-40 inches. Is there a simple and low cost solution to stop the conveyor faster? A distance of 18 inches or less would be great. A brake motor (integral brake mounted to the motor) is too abrupt and cause high stress in the drive system. VFD drives and other DC injection controllers will do the job but add significant cost - (there are about 150 drive motors).
Total load weight varies is about 12,000 # maximum and the conveyor drive is a 2 HP 1750 RPM motor driving though a gear reducer. The inertia of the weight of the pallets is about 85% of the total system inertia. An average motor braking torque of about 1.5 FT-# is all that is needed to stop the load in this distance.
Total load weight varies is about 12,000 # maximum and the conveyor drive is a 2 HP 1750 RPM motor driving though a gear reducer. The inertia of the weight of the pallets is about 85% of the total system inertia. An average motor braking torque of about 1.5 FT-# is all that is needed to stop the load in this distance.