allscott
Member
- Join Date
- Jul 2004
- Posts
- 1,332
Is allscott a tach, encoder, resolver salesman, by any chance? Am mystified otherwise by the comment of always using an encoder. Sure is a lot easier and cheaper to use sensorless vector with a commodity motor rather than an encoder, VFD encoder module, pipe and wire, and a motor built with a backside mounting face.
Of course, there certainly are applications that must use an encoder but, in my world that is less than 1% of the total.
Honestly no I am not but I haven't had the greatest of luck with SVC and my plant is standardized on one brand of drive. I don't have the option of putting in an ABB with DTC, we simply buy one brand of drive and spec all of our OEM machines to come with that brand. Basically if anything we need requires more than V/HZ control we use an encoder.
It would be a different story for sure if we were an OEM and the cost of hardware was a major concern, with us it isn't. Most of the drives we are installing with encoders are replacing older DC units. We are already pulling wire and there is already a pipe from the tach or an existing encoder so running a line for an encoder is never a big deal.
If I could turn back the clock about 15 years and standardized on something like an ABB ACS series drive I'm sure our plant would have a lot of equipment with a lot more sensorless vector control.
I should have qualified my comments a bit before commenting on sensoreless vector.
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