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George Price
Guest
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 Posted:
Sat Feb 19, 2005 3:51 am Post subject:
acceleration circuit? |
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I own an RC tank that has a simple on / off motor control. When you move
the joystick forward or reverse it jumps forward at full speed. Is there a
way to have motors gradually accelerate to it's top end and then decelerate
when the joystick is zeroed?
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Rene Tschaggelar
Guest
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| Posted:
Sat Feb 19, 2005 3:57 am Post subject:
Re: acceleration circuit? |
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George Price wrote:
| Quote: | I own an RC tank that has a simple on / off motor control. When you move
the joystick forward or reverse it jumps forward at full speed. Is there a
way to have motors gradually accelerate to it's top end and then decelerate
when the joystick is zeroed?
|
Sure. With a switchmode power controller. That should be
available as optional item at your preferred shop.
Rene
--
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net |
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John Woodgate
Guest
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| Posted:
Sat Feb 19, 2005 4:09 am Post subject:
Re: acceleration circuit? |
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I read in sci.electronics.design that George Price
<gprice7418@wowway.com> wrote (in <kdOdnRzgbcrb_ovfRVn-
pg@wideopenwest.com>) about 'acceleration circuit?', on Fri, 18 Feb
2005:
| Quote: | I own an RC tank that has a simple on / off motor control. When you move
the joystick forward or reverse it jumps forward at full speed. Is there a
way to have motors gradually accelerate to it's top end and then decelerate
when the joystick is zeroed?
Yes, but it's not all that easy. You need pulse-width modulation motor |
speed control, with automatic pulse-width variation. The problem is to
make the control circuit losses very low, otherwise the top speed will
emulate a WW One tank.
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
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Don Lancaster
Guest
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| Posted:
Sat Feb 19, 2005 5:12 am Post subject:
Re: acceleration circuit? |
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John Woodgate wrote:
| Quote: | I read in sci.electronics.design that George Price
gprice7418@wowway.com> wrote (in <kdOdnRzgbcrb_ovfRVn-
pg@wideopenwest.com>) about 'acceleration circuit?', on Fri, 18 Feb
2005:
I own an RC tank that has a simple on / off motor control. When you move
the joystick forward or reverse it jumps forward at full speed. Is there a
way to have motors gradually accelerate to it's top end and then decelerate
when the joystick is zeroed?
Yes, but it's not all that easy. You need pulse-width modulation motor
speed control, with automatic pulse-width variation. The problem is to
make the control circuit losses very low, otherwise the top speed will
emulate a WW One tank.
|
This is ----> a lot <--- messier than it sounds.
The model rr folks solved it decades ago.
You need a pulse on a ramp or its PWM equivalent to overcome stiction.
You want it to lurch at a carefully controlled rate.
BASIC STAMP should do it.
--
Many thanks,
Don Lancaster
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
voice: (928)428-4073 email: don@tinaja.com
Please visit my GURU's LAIR web site at http://www.tinaja.com |
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Rich Grise
Guest
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| Posted:
Sat Feb 19, 2005 6:10 am Post subject:
Re: acceleration circuit? |
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On Fri, 18 Feb 2005 16:51:03 -0500, George Price wrote:
| Quote: | I own an RC tank that has a simple on / off motor control. When you move
the joystick forward or reverse it jumps forward at full speed. Is there a
way to have motors gradually accelerate to it's top end and then decelerate
when the joystick is zeroed?
|
Check in rec.models.rc.* (there's a bunch of models.rc. groups.) Radio
Control sets have been doing this for years. You get a thing that plugs
in where a servo plugs in, called a "motor controller". It does exactly
what you describe.
You can buy it cheaper than you can build it.
Good Luck!
Rich |
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