Counting Rotations

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MadCow2357
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Re: Counting Rotations

Postby MadCow2357 » March 9th, 2019, 8:51 pm

If the motor is restisting rotation because of the electromagnets, it is probably being short circuited. This could be caused by the braking system you were referring to (an eddy current brake). If you are using an eddy brake again, disengaging the brake should be all you have to do to get it to rotate pretty freely.
If the motor isn’t being shorted, the problem is more likely high inertia and/or high friction in the motor or other parts of the buggy. You could try and fix this in a few ways, including:
1. Replacing the problem part(s). If the part you replace is the motor, your buggy might be able to accelerate faster, since the motor won’t have to overcome as much inertia before moving.
2. Disconnect the motor from the axle. If you are using a coupler with set screws, you could loosen the set screws and make you distance setting with the motor disconnected. Then retighten the set screws before the run. This might not work, depending on your configuration.
I hope this helped. Good luck with your buggy!
I don't think it's an issue of short circuiting or problematic parts - I believe my motor was made that way. According to the website, it has a stall torque of 44 ounces per inch. I'm guessing that it is the reason why I cannot rotate my motor freely. I'll look into motors that have less stall torque, which should function you as described - rotating easily and freely.

The latter of your suggestions won't work in my current configruation, lol.
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Re: Counting Rotations

Postby MadCow2357 » March 9th, 2019, 8:53 pm

(double post - mods please delete)
Last edited by MadCow2357 on March 13th, 2019, 2:00 pm, edited 1 time in total.
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Re: Counting Rotations

Postby invisiblebanana » March 13th, 2019, 12:42 pm

Has anyone calculated the distance that the vehicle would travel for each of the possible target distances?
Or do you just roll the vehicle over the arc during testing and count the rotations then?
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Re: Counting Rotations

Postby MadCow2357 » March 13th, 2019, 1:58 pm

Has anyone calculated the distance that the vehicle would travel for each of the possible target distances?
Or do you just roll the vehicle over the arc during testing and count the rotations then?
I would advise against trying to use those distances to calculate your brake setting, since the other factors that can affect your run are numerous and sometimes impossible to predict without extensive testing. It would be easier to test a lot, and base your wheel setting on previous data than use an equation to find the optimal brake setting for every distance.
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Re: Counting Rotations

Postby LittleMissNyan » March 13th, 2019, 2:55 pm

Has anyone calculated the distance that the vehicle would travel for each of the possible target distances?
Or do you just roll the vehicle over the arc during testing and count the rotations then?
I would advise against trying to use those distances to calculate your brake setting, since the other factors that can affect your run are numerous and sometimes impossible to predict without extensive testing. It would be easier to test a lot, and base your wheel setting on previous data than use an equation to find the optimal brake setting for every distance.
So I don't know if your Battery Buggies will work like this, but what we do is we set the Battery Buggy at where we want to finish, put a piece of tape on the wheel, and roll the Battery Buggy backwards to the starting line we have, counting the rotations of tape. It makes for a pretty good estimate.
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Re: Counting Rotations

Postby MoMoney$$$;)0) » March 13th, 2019, 7:14 pm

Isn't that illegal?

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Re: Counting Rotations

Postby MadCow2357 » March 13th, 2019, 7:41 pm

Has anyone calculated the distance that the vehicle would travel for each of the possible target distances?
Or do you just roll the vehicle over the arc during testing and count the rotations then?
I would advise against trying to use those distances to calculate your brake setting, since the other factors that can affect your run are numerous and sometimes impossible to predict without extensive testing. It would be easier to test a lot, and base your wheel setting on previous data than use an equation to find the optimal brake setting for every distance.
So I don't know if your Battery Buggies will work like this, but what we do is we set the Battery Buggy at where we want to finish, put a piece of tape on the wheel, and roll the Battery Buggy backwards to the starting line we have, counting the rotations of tape. It makes for a pretty good estimate.
Isn't that illegal?
Yeah LMN you aren't supposed to do that. You may not roll the buggy on the "track" during competition day, that's a rule.
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Re: Counting Rotations

Postby LittleMissNyan » March 14th, 2019, 6:41 am

I would advise against trying to use those distances to calculate your brake setting, since the other factors that can affect your run are numerous and sometimes impossible to predict without extensive testing. It would be easier to test a lot, and base your wheel setting on previous data than use an equation to find the optimal brake setting for every distance.
So I don't know if your Battery Buggies will work like this, but what we do is we set the Battery Buggy at where we want to finish, put a piece of tape on the wheel, and roll the Battery Buggy backwards to the starting line we have, counting the rotations of tape. It makes for a pretty good estimate.
Isn't that illegal?
Yeah LMN you aren't supposed to do that. You may not roll the buggy on the "track" during competition day, that's a rule.
I mean not during the competition...... we do that beforehand and just use the number we got at the competition
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Re: Counting Rotations

Postby invisiblebanana » March 14th, 2019, 12:43 pm

Has anyone calculated the distance that the vehicle would travel for each of the possible target distances?
Or do you just roll the vehicle over the arc during testing and count the rotations then?
I would advise against trying to use those distances to calculate your brake setting, since the other factors that can affect your run are numerous and sometimes impossible to predict without extensive testing. It would be easier to test a lot, and base your wheel setting on previous data than use an equation to find the optimal brake setting for every distance.
I've already calculated how many times I would need to turn the wheel to rewind the brake for each possible distance interval. What are some of the factors that I need to account for?
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Re: Counting Rotations

Postby MadCow2357 » March 14th, 2019, 1:34 pm

I've already calculated how many times I would need to turn the wheel to rewind the brake for each possible distance interval. What are some of the factors that I need to account for?
Just to name a few: skidding (big), wheel slippage, oversteer, understeer, drifting
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