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VSD and Gearbox


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#1 Mick35

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Posted 14 March 2006 - 07:12 AM

Hi,

With the advent of forced cooled electric motors and sophisticated VSDs , will gearboxes still be required for speed reduction.
Thanks fora reply.

Mick

#2 chaterpilar

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Posted 14 March 2006 - 02:49 PM

Dear Mick,

Yes they will continue to exist.....as torque multipliers.

chaterpilar

#3 jraef

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Posted 14 March 2006 - 07:16 PM

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!"

#4 jOmega

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Posted 17 March 2006 - 08:23 AM

jraef:

Please list some applications whereby the load torque increases as speed is reduced.

Thanks,

jΩ

#5 jraef

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Posted 17 March 2006 - 10:57 PM

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!"

#6 jOmega

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Posted 18 March 2006 - 05:08 AM

jraef:

Amen !

jΩ

:)




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