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VSD and Gearbox


Mick35

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That's right Mick35. Your point about using them strictly as speed changers would be valid, but in a lot of cases, the reduction of speed is accompanied by an increase in shaft torque, which you do NOT get with a VFD. For those applications a gear box is still necessary. What will likely fall by the wayside however will be mechanical varidrives, variable pitch pulley / belt drives that changed speed and torque. A VFD plus a gear box are the most efficient way of doing the same thing.
"He's not dead, he's just pinin' for the fjords!"
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I didn't say that, but I can see how that may have looked that way. I meant that in some applications, gear boxes are used by the design engineer not only to lower the speed but also to increase the torque. So you can't automatically use a VFD to eliminate a gearbox without knowing the design criterea for which the gearbox was used.
"He's not dead, he's just pinin' for the fjords!"
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