Sunday, January 25, 2009

Applications

When applying an AC drive and motor to an application it is necessary to know the horsepower, torque, and speed characteristics of the load. The following chart shows typical characteristics of various loads.



Loads generally fall into one of three categories:


Constant Torque

The load is essentially the same throughout the speed range. Hoisting gear and belt conveyors are examples.


Variable Torque
The load increases as speed increases. Pumps and fans are examples.


Constant Horsepower

The load decreases as speed increases. Winders and rotary cutting machines are examples.

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