From a mechanical standpoint, wouldn't two separate drives (with the midstation between) necessitate complex synchronizing controls between the two drives, to prevent different line speeds?
Or... hmm. I have to think about this more. :) I guess it'd work fine if they were running at different speeds (you'd just have a different chair pitch on one line than the other), but during start up you'd want to ramp both lines up at the same rate, otherwise you'd cadencing drive would be going whacko trying to correct the difference...
-Iain
0
Peak 8 Superconnect at Breck
Started by highspeedquad, Jan 31 2005 03:49 PM
27 replies to this topic
#21
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#22
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Posted 18 February 2005 - 01:42 PM
Sorry for going 
but the peak 8 superconnect is not the picture there anymore.
but the peak 8 superconnect is not the picture there anymore.
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#24
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Posted 19 February 2005 - 04:45 AM
Duck, on Feb 18 2005, 12:52 PM, said:
From a mechanical standpoint, wouldn't two separate drives (with the midstation between) necessitate complex synchronizing controls between the two drives, to prevent different line speeds?
Or... hmm. I have to think about this more. :) I guess it'd work fine if they were running at different speeds (you'd just have a different chair pitch on one line than the other), but during start up you'd want to ramp both lines up at the same rate, otherwise you'd cadencing drive would be going whacko trying to correct the difference...
-Iain
<{POST_SNAPBACK}>
Or... hmm. I have to think about this more. :) I guess it'd work fine if they were running at different speeds (you'd just have a different chair pitch on one line than the other), but during start up you'd want to ramp both lines up at the same rate, otherwise you'd cadencing drive would be going whacko trying to correct the difference...
-Iain
<{POST_SNAPBACK}>
It wouldn't be as complex as you might think. Instead of having the cadencing take place at one end only, there would be an active system at both ends. Half of the midstation tyres would be driven by one system, and half by the other so that the grips are matched to the speed of the rope no matter if the ropes are going the same speed or not.
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#25
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Posted 19 February 2005 - 07:29 AM
I guess the problem I was imagining is, what happens if you start up one rope and the other one doesn't start up at the same time (in the situation where the drives aren't closely coordinated)? I'd imagine you'd get a whole whack of chairs with nowhere to go in the midstation.
-Iain
-Iain
#26
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Posted 20 February 2005 - 04:41 AM
If that happened I imagine the software engineer would have a lot to explain. The safeties wouldn't let one drive operate without the other. The Flyer and Super Bee both have two drives, although the two motors are coupled to the same gearbox. If they both don't start up, you get a drive fault annunciation and the e-brake sets automatically.
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#27
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Posted 20 February 2005 - 08:15 AM
Very nice. I imagined it'd be something like that. We did a project once (I work for a robotics and automation firm) where we had a series of 6 pairs of carefully spaced rollers, each one driven by a gearmotor and VFD (each subsequent roller pair was spaced closer together, to squeeze some material flat, and so each roller pair had to move at a slightly different speed). I think the programmers just had it set so that all 6 VFD's got a start signal at the same time.
-Iain
-Iain
#28
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Posted 20 February 2005 - 10:15 AM
Quicksilver (at breckenridge) has a total of 10 drives. One for the main motor (approx 1000 hp), seven for motors at the bottom (approx 5 hp each) to move the chairs through the bottom terminal, and two drives for the gates (which are large servos) that do the double loading thing.
If any of these drives doesn't work as expected, a fault is generated and the lift stops.
If any of these drives doesn't work as expected, a fault is generated and the lift stops.
This post has been edited by Mike: 20 February 2005 - 10:17 AM
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