what about a spring coupler and 2 encoders? and do current measurements
while exerting known levels of torque, make a chart so you know how much
current = how much torque, use current monitoring... isolated ADC across
shunt resistors for each phase of each motor be it AC or DC. It'd jsut be
quite a few inputs to watch, and might end up being not the fastest of all.
i know from watching the load meter on the mills at work that you can easily
see a change in the trend when the tool's wearing. so if you could script
it to alarm when it's increased by X% from an average of the first number of
runs on that tool. I know the new fadal's my work has does have spindle
load limits for you can set for each tool...
Sorry if this has been a long ramble, i guess i'm getting all i can out of
'computer time' before i have to go do the dishes.... hehe...
On Feb 11, 2008 2:36 PM, Geoff <[EMAIL PROTECTED]> wrote:
> On Tuesday 12 February 2008 04:55, W. Jacobs wrote:
> > aram,
> > It would be easier to measure current to the motor as this would be what
> > creates the torque. Current measurement is easy.
> > If you want to truly measure the torque, it is done either with a strain
> > gauge on the shaft or with a spring coupled drive and measure the
> > deflection of the spring. Either way, you need a pair of slip rings to
> > get the information to the outside world. These are noisy and will be
> > hard to use.
> >
> > bill
> >
> > [EMAIL PROTECTED] wrote:
> > > Hi
> > > Can you measure torque on AC servo motor?
> >
> >
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> Hi Guys,
> another way of measuring torque involves 2 toothed rings and hall
> effect
> pick-ups. Ensure that the rings are rigidly fixed to the shaft and you
> will
> find that you will get a varying phase difference between the output of
> your
> two pick-ups as the shaft twists under torque loading. No noisy slip
> rings :-) .
>
> Cheers, Geoff.
>
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