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VFDs versus VSDs (1 viewing) (1) Guest
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TOPIC: VFDs versus VSDs
#2
aferretti (Admin)
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VFDs versus VSDs 3 Months, 1 Week ago Karma: 0  
What is the difference between a variable frequency drive and a variable speed drive? Are they essentially the same things with different names?
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#5
Mivos (User)
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Re:VFDs versus VSDs 2 Months, 3 Weeks ago Karma: 0  
A VFD is an ac drive that controls the speed of a pump by changing the frequency of ac power which is normally 60 hz in the US. A VSD can be electric, mechanical or hydraulic. So, a VSD can be a VFD, but it can also be a dc drive that uses voltage change to control speed or it can be mechanical that uses gearing, variable pitch (belts & pulleys) or a traction drive. There are several types of hydraulic adjustable speed drives available also.
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