Motor

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Re: Motor

Postby shrewdPanther46 » Wed Jan 10, 2018 6:00 pm

MadCow2357 wrote:Hi Everyone,
I am relatively new to Battery Buggy, but I did help with Scrambler last year. I am a bit overwhelmed by the number of options I have to choose from online (I want to look at some motors before I decide. What is a good rpm for the motor, and what is a reasonable price? Also,, are there are good brands that I should look out for?

Thanks, MadCow2357


retired1 wrote:
Pololu 25D is 6 volts and available in several rpm's. It is a bit more expensive than generic Chinese motors.


Don't look at just RPM, just a warning...
salty

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Re: Motor

Postby retired1 » Wed Jan 10, 2018 10:42 pm

Most any motor rpm will work, but then you need to pay very close attention to the # of teeth on both the driven and the driver gear.
I selected the 460 output rpm of the Polou 25D. It would have been a lot easier if I had used the next higher rpm which was about 1,000 . That would have allowed the 2 gears to have been close to the same size. Do not forget the diameter of the motor when choosing gears. Mine gets very close to the axle.

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Re: Motor

Postby MadCow2357 » Fri Jan 12, 2018 2:10 pm

retired1 wrote:Most any motor rpm will work, but then you need to pay very close attention to the # of teeth on both the driven and the driver gear.
I selected the 460 output rpm of the Polou 25D. It would have been a lot easier if I had used the next higher rpm which was about 1,000 . That would have allowed the 2 gears to have been close to the same size. Do not forget the diameter of the motor when choosing gears. Mine gets very close to the axle.

The website says with encoder and without encoder for this motor. Do I need an encoder?
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Re: Motor

Postby shrewdPanther46 » Fri Jan 12, 2018 2:29 pm

an encoder is not on the allowed list of electrical components, so you don't need it and it would be against the rules. Plus, you have nothing to read data from it like a micro controller.
salty

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Re: Motor

Postby MadCow2357 » Mon Jan 15, 2018 4:17 pm

shrewdPanther46 wrote:an encoder is not on the allowed list of electrical components, so you don't need it and it would be against the rules. Plus, you have nothing to read data from it like a micro controller.

Thanks.
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Re: Motor

Postby MadCow2357 » Mon Jan 15, 2018 4:20 pm

retired1 wrote:Most any motor rpm will work, but then you need to pay very close attention to the # of teeth on both the driven and the driver gear.
I selected the 460 output rpm of the Polou 25D. It would have been a lot easier if I had used the next higher rpm which was about 1,000 . That would have allowed the 2 gears to have been close to the same size. Do not forget the diameter of the motor when choosing gears. Mine gets very close to the axle.

Is $21 a reasonable price for a motor? Is 460 rpm good enough?
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Re: Motor

Postby MadCow2357 » Mon Jan 15, 2018 4:21 pm

MadCow2357 wrote:
retired1 wrote:Most any motor rpm will work, but then you need to pay very close attention to the # of teeth on both the driven and the driver gear.
I selected the 460 output rpm of the Polou 25D. It would have been a lot easier if I had used the next higher rpm which was about 1,000 . That would have allowed the 2 gears to have been close to the same size. Do not forget the diameter of the motor when choosing gears. Mine gets very close to the axle.

Is $21 a reasonable price for a motor? Is 460 rpm good enough?

I meant the Polulu 25D 460 rpm without an encoder:
https://www.pololu.com/product/1572
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Re: Motor

Postby MadCow2357 » Tue Jan 16, 2018 12:36 am

If I were to use a 6v motor, could I use a battery holder for 8 AAs (12 volts)? Or would I need a battery holder for 4 AAs instead

Thanks, MadCow2357
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Re: Motor

Postby builder83 » Tue Jan 16, 2018 12:50 am

MadCow2357 wrote:If I were to use a 6v motor, could I use a battery holder for 8 AAs (12 volts)? Or would I need a battery holder for 4 AAs instead

Thanks, MadCow2357


I tries 8 and 7 and 6 batteries and it melted stuff. 4 maybe 5 will work.

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Re: Motor

Postby shrewdPanther46 » Tue Jan 16, 2018 1:24 am

^
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Re: Motor

Postby MadCow2357 » Tue Jan 16, 2018 2:20 pm

MadCow2357 wrote:
retired1 wrote:Most any motor rpm will work, but then you need to pay very close attention to the # of teeth on both the driven and the driver gear.
I selected the 460 output rpm of the Polou 25D. It would have been a lot easier if I had used the next higher rpm which was about 1,000 . That would have allowed the 2 gears to have been close to the same size. Do not forget the diameter of the motor when choosing gears. Mine gets very close to the axle.

Is $21 a reasonable price for a motor? Is 460 rpm good enough?
2017-2018 Events: Battery Buggy, Mystery Architecture, and Towers
2018-2019 Events: Battery Buggy, Boomilever, Thermodynamics, maybe ELG

"“Son, if you really want something in this life, you have to work for it. Now quiet! They're about to announce the lottery numbers.” - Homer Simpson

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Re: Motor

Postby MadCow2357 » Sun Jan 21, 2018 3:01 am

I will be using the Polulu 25D (6V), which retired1 recommended, but I am still deciding which rpm version I should get. 460 rpm was recommended by retired1, but I think it would be safer to go with the 2150 rpm, which is the highest rpm without an encoder. I can always use gears to slow down the Buggy. Or, all are of the motors the same thing, except they are geared differently, having greater or less torque depending on the rpm chosen. I'm open to suggestions of other motors as well, since I have very limited experience in this.
2017-2018 Events: Battery Buggy, Mystery Architecture, and Towers
2018-2019 Events: Battery Buggy, Boomilever, Thermodynamics, maybe ELG

"“Son, if you really want something in this life, you have to work for it. Now quiet! They're about to announce the lottery numbers.” - Homer Simpson

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Re: Motor

Postby builder83 » Mon Jan 22, 2018 2:59 am

I see a lot of 6v motor auggestions. Any 12v motors working well?

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Re: Motor

Postby shrewdPanther46 » Mon Jan 22, 2018 3:32 am

builder83 wrote:I see a lot of 6v motor auggestions. Any 12v motors working well?

I'd assume they are suitable...
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