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You can sleep in a car, but you can't race a house
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Posts: 311
Join Date: Mar 2007
Location: Buffalo Grove, IL
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Is Torque Limiting independent of Input Voltage? -
05.10.2012, 12:16 PM
Example? I set my Torque limiting at a setting that allows me to run 3S happily. But if I drop it to 2S lipo I don't need any torque limiting really.
Is torque limiting tied to the input voltage as a percentage, or is it an independent setting that doesn't change based in a different input voltage?
- 1989 Pontiac TransAm GTA, 5.7L LT1/M6 400rwhp+
- Jammin X1 CRT Pro, MMM/1717, 6S
- Hyper One Seven 1/7th scale GT car, MMM/1717, 6S
- Hyper 10TT, MMP/1410, 3S
- TL Mini 8ight, stock, 2S
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RC-Monster Aluminum
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Posts: 522
Join Date: Jan 2007
Location: Sussex, England.
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05.10.2012, 01:16 PM
I would have thought that torque limiting is a different name and implementation for amp limiting that has been around for ages, with torque limiting holding the amp draw at a maximum level plateau, rather than shutting down when the maximum amp draw is hit.
Motors have a reasonably static KT (torque per amp) so when you drop from 3s to 2s with the same gearing your amp draw lowers and you wont be getting near the torque limit you set for 3s, gear back up to the same speed and the amps will try to increase and you will be riding the limit harder than you were on 3s.
Hot Bodies Lightning 2 Pro carbon, Mega 22/30/2, MMM, 4s3-5Ah.
Tamiya F201 carbon, Mamba 7700, MM, 2s A123 2.3ah.
Xray XT8, 1518, MMM, 4s5Ah.
Lots of boats.
fastelectrics.net
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You can sleep in a car, but you can't race a house
Offline
Posts: 311
Join Date: Mar 2007
Location: Buffalo Grove, IL
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05.10.2012, 04:15 PM
I really don't know how it works. But the calibration process is supposedly independent of the input voltage. I don't know if the software simply limits the delta/rpm for motor acceleration, or if it does it via amp limits.
I was kinda hoping that Castle could step in here and explain how it works.
Mainly because my main 1/8th Truggy basher runs on 3S or 4S at the track, and 4S and 6S when bashing. I don't want to have to change the torque limiting value every time i switch out to a different voltage for something.
I don't think I have to change it if Torque Limiting works the way I think it does, but was just looking for an official explanation from Castle as to how it works.
I know that punch control smooths out throttle inputs so they aren't as spiky, but I don't think Torque Limiting works the same way.
- 1989 Pontiac TransAm GTA, 5.7L LT1/M6 400rwhp+
- Jammin X1 CRT Pro, MMM/1717, 6S
- Hyper One Seven 1/7th scale GT car, MMM/1717, 6S
- Hyper 10TT, MMP/1410, 3S
- TL Mini 8ight, stock, 2S
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