Only to folks that have never used a machine that has been converted to a VFD. Variable speed without changing gears or using a variable sheave system. Soft starts/stops and reversals. No parasitic power use like a rotary. No noise like a rotary. Cheaper unless you have lots of machines to run. The 4 VFDs in my shop machines cost me on average about $125 each.
The concern about insulation damage on a motor not rated for inverter use is way overblown. Sure, the possibility exists, but I have never seen it happen despite having been involved with several VFD installs.
I have 4 VFDs running motors in my shop. The oldest motor is from the 30s and has been used a couple times a week for 6+ years with no problems.
A friend has an older 40HP motor on his sawmill running off a 3 phase genset. Put an inverter on that and set up a soft start to not bog the genset down when starting the blade. That has been running for 10 years now with no trouble.
Factory I used to work at added VFDs to several of the exhaust fans used to keep the air clear in the fab shop. Did that so when things were slow or cold outside they could slow down the ventilation or speed it up in summer or things were real busy. Those were up to 15HP and again never had an insulation problem despite running 24 hours by 5-6 days per week. We did have one of those have a bearing go out after a couple years on the VFD. There was some speculation that it may have been related to VFD use, but was never proven. Replaced the bearings and it was still going when I retired.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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