Does the application demand a constant or variable torque loads?
Matching the drive to the load characteristics of an application is a primary consideration in selecting adjustable speed drives. Constant torque loads are very common. The drive can provide constant torque operation because motor output horsepower is directly proportional to speed and rated torque is available at any speed. Using power rated motors with adjustable speed drives ensures the correct match between the drive, the motor and the application. Constant torque loads are essentially friction loads. Constant torque is required to overcome friction. Typical constant torque applications include conveyors, extruders, and surface winders and other applications involving shock, overloads, and high inertia loads. Variable torque is often applied to help save energy. Common variable torque application includes centrifugal pumps, fans, and blowers. By applying adjustable speed drives, the air or liquid flow can be control directly by controlling the speed of the motor. Since losses due t
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