Absolutely, Alex. In my previous position, the MBTF was actually more important than linear accuracy. It was so true that "others" demanded a spare as part of the standard BOM, rather than on the list of suggestions for our customers. (It was useful too, when the mechanical system fail and destoyed the position sensor - which actually was working quite well).
My experience with resolvers was with ABB industrial robots. The first absolute positioning system I saw used 3 resolvers (IRB 90), followed by 2 (IRB 2000) and finally 1 resolver and a revolution counter (IRB 6400). The feature I thought was most useful was it 'failed-safe'. An axis with an encoder has to fail to show movement feed-back when commanded to move to detect a failure. How far does tha axis move before the lack of position change feed-back causes a fault ? With a resolver, a broken wire causes a failure during initialization.
Environmental protection is frequently a deciding factor in industrial environments. Can it take being hosed down with high pressure, caustic solutions such as is found in food processing? Can it resist coolant or oil?
Positional accuracy seems like the key spec when choosing a rotary encoder, but what about MTBF? Does that come into play at all, especially considering that it's a part which gets a heavy and constant workout?
We are using a RVDT to track the opening percentage of large Ball type valves used in Pipelines to monitor closing sequence and speed. Here, resolution was not necessary, but reliability is of utmost importance; the RVDT is rugged and very reliable. Amclaussen.
A middle school team from Rochester, Mich., has again nabbed the grand prize in the annual international Future City Competition, which drew students from 37 regions of the United States, as well as from England and China.
The word “smart” is becoming the dumbest word around. It has been applied to almost every device and system in our homes. In addition to smartphones and smart meters, we now hear about smart clothing and smart shoes, smart lights, smart homes, smart buildings, and every trendy city today has its smart city project. Just because it has a computer inside and is connected to the Web, does not mean it is smart.
Are you being paid enough? Do you want a better job? According to a recent survey Manpower released just before Engineers Week, employers and engineers don't see eye-to-eye about the state of US engineers' skills and experience.
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