Traditionally, V-belt drives offered limited capabilities that addressed certain requirements within the industry. V-belts were most commonly used for reducing motor input speeds on specific reducer types, to keep them within their optimum operating range. In addition, they offered the flexibility to change or fine-tune speeds in the field after installation. By adjusting the belt drives, the number of gear ratios used throughout the mill could be reduced. And V-belts were sometimes considered an inexpensive method of protecting gear units in overload conditions.
There are some good reasons for eliminating V-belt drives on The Input Side Of Reducers. Apart from the loss of horsepower and efficiency through belt slippage, V-belts impose overhung loads which can limit the longevity of motor/reducer bearings. Their limited flexibility cannot accommodate today's high stop/start cycling applications. And there are safety issues - not only must V-belts be replaced as they wear out, but when belt guards are removed, exposed V-belts are dangerous to maintenance personnel. Moreover, the relatively large dimensional envelope of the complete drive takes up considerable shop space.
By comparison, AC gearmotors offer numerous practical advantages. First and foremost, with modern helical gearing, gearmotors deliver dramatically better operating efficiency. Because overhung loads on the motor and reducer-shaft bearings are eliminated, service life is longer. The maintenance required to align belts and couplings is also eliminated, as are the safety concerns.
|Energy Savings ($)||57,000||36,000||$21,000|