As Mike points out, if it is at all possible to operate on a tension-torque feedback loop instead, that would almost certainly be preferable. VFDs have PID logic embedded that will cause the motor speed to adjust to supply the desired torque and hence achieve the desired tension. How are you...
Interesting idea!
I couldn't find any off the shelf ultrasonic solutions for this sort of thing, but I was reminded of an old school experiment involving wave propagation speed's relation to tension in strings. Obviously a length of copper pipe is fairly far removed from a guitar string, but...
I'd like to implement some closed loop control for a machine winding a feed of copper pipe around some changing geometry. The tension in the copper pipe feed needs to be controlled to allow for suitably tight bends without damaging either the feed or the apparatus, but at the moment there is no...
I have a TTL incremental rotary encoder mounted to a motor and connected to a controlling computer through a serial interface.
In an effort to improve the motor's low speed/torque response I'd like to investigate the possibility of splitting the encoder output and additionally using it as a...
Uncanny! I see what you're getting at.
So yes, my project is fundamentally a winding application where the tension in the feed must be kept as constant as possible while speed accuracy is fairly inconsequential. However, the pattern that is to be wound is geometrically complicated, and these...
jraef:
Yeah, it's rebranded. I've given it its autotune. During primary operation it needs to be in torque vector, since the operation demands a variable torque. I recognize that this is perhaps not the ideal VFD for the job - but this is what the project owns and I'll have to make the best...
That's a good point - looking through the parameters, while "IM Motor Vector Torque Control with Speed Limit" is certainly a discreet control platform, it doesn't look like I can adjust the gains of the torque control loop - only the speed controller. Would this imply that there isn't a true...
I have a similar problem.
My motor is highly rated for my application, so there are times at which I need to be able to run both at relatively low speed and low torque. However, this is a torque controlled application, controlled at the moment with sensorless vector control from a VFD. What...
