Motor / gearbox Design for 100 lb AGV

Posted by mark on April 20, 2008, 7:12 pm

Mechanically inclined, not electrically engineer inclined needing to
power a 100 lb t shirt shooting vehicle (AGV). Team already has 2 12
volt (small car battery) power sources and 8 in wheels. Notion is to
have 4 motors, one for each wheel. Design top speed about 6 mph (want
to be able to keep up with it with a slow jog).

Issue is how to decide among the many motors? Want beefy enough motor
to accelerate and but also want to keep it light and cost effective.
Suggestions welcomed. Most robot parts dont seem adequate to power a
100lb vehicle.

Posted by Curt Welch on April 21, 2008, 1:34 am

> Mechanically inclined, not electrically engineer inclined needing to
> power a 100 lb t shirt shooting vehicle (AGV). Team already has 2 12
> volt (small car battery) power sources and 8 in wheels. Notion is to
> have 4 motors, one for each wheel. Design top speed about 6 mph (want
> to be able to keep up with it with a slow jog).
> Issue is how to decide among the many motors? Want beefy enough motor
> to accelerate and but also want to keep it light and cost effective.
> Suggestions welcomed. Most robot parts dont seem adequate to power a
> 100lb vehicle.

Look at the parts sold for the combat bots. They are around the size and
power you are looking at. Here's a store that sells to that market with an
example high power motor:

http://www.robotmarketplace.com/products/NPC-T64.html

I don't know how to estimate how much power you need to push your machine.
Is it going to be running on grass or a hard surface? It will need more
power to run and turn on grass. Motors and power controllers for these
size motors will not be cheap if you want real control over the machine
(like R/C control with variable speed and steering). The above store might
be able to help you pick parts to meet your needs.

You will probably save money by using 2 motors and 2 speed controllers
instead of 4 smaller motors.

--
Curt Welch http://CurtWelch.Com/
curt@kcwc.com http://NewsReader.Com/

Posted by John Nagle on April 21, 2008, 12:24 pm

Curt Welch wrote:

>> Mechanically inclined, not electrically engineer inclined needing to
>> power a 100 lb t shirt shooting vehicle (AGV). Team already has 2 12
>> volt (small car battery) power sources and 8 in wheels. Notion is to
>> have 4 motors, one for each wheel. Design top speed about 6 mph (want
>> to be able to keep up with it with a slow jog).
>> Issue is how to decide among the many motors? Want beefy enough motor
>> to accelerate and but also want to keep it light and cost effective.
>> Suggestions welcomed. Most robot parts dont seem adequate to power a
>> 100lb vehicle.

>
> Look at the parts sold for the combat bots. They are around the size and
> power you are looking at. Here's a store that sells to that market with an
> example high power motor:
>
> http://www.robotmarketplace.com/products/NPC-T64.html

1.    What's a "shirt shooting vehicle"?

2.    How does this thing steer? With four wheels, differential
    drive won't work very well.

3.    See "http://www.roboteq.com" for motor controllers in the
    indicated range.

                    John Nagle
                    Animats

Posted by mark on April 21, 2008, 2:08 pm

> Curt Welch wrote:

> >> Mechanically inclined, not electrically engineer inclined needing to
> >> power a 100 lb t shirt shooting vehicle (AGV). Team already has 2 12
> >> volt (small car battery) power sources and 8 in wheels. Notion is to
> >> have 4 motors, one for each wheel. Design top speed about 6 mph (want
> >> to be able to keep up with it with a slow jog).
> >> Issue is how to decide among the many motors? Want beefy enough motor
> >> to accelerate and but also want to keep it light and cost effective.
> >> Suggestions welcomed. Most robot parts dont seem adequate to power a
> >> 100lb vehicle.

> > Look at the parts sold for the combat bots. They are around the size and
> > power you are looking at. Here's a store that sells to that market with an
> > example high power motor:
> >http://www.robotmarketplace.com/products/NPC-T64.html

> 1. What's a "shirt shooting vehicle"?
> 2. How does this thing steer? With four wheels, differential
> drive won't work very well.
> 3. See "http://www.roboteq.com" for motor controllers in the
> indicated range.
> John Nagle
> Animats

It is a vehicle with an air powered cannon to shoot T-shirts into the
crowd of a sports game (basketball) for example. Application is smooth
floor. You are correct, manuverability will be important to help aim
the shirt. The cannon mount is fixed, and does not spin, the vehicle
will need to turn to aim the shirt. Thank you.

Posted by John Nagle on April 21, 2008, 4:12 pm

mark wrote:

>> Curt Welch wrote:

>>>> Mechanically inclined, not electrically engineer inclined needing to
>>>> power a 100 lb t shirt shooting vehicle (AGV). Team already has 2 12
>>>> volt (small car battery) power sources and 8 in wheels. Notion is to
>>>> have 4 motors, one for each wheel. Design top speed about 6 mph (want
>>>> to be able to keep up with it with a slow jog).
>>>> Issue is how to decide among the many motors? Want beefy enough motor
>>>> to accelerate and but also want to keep it light and cost effective.
>>>> Suggestions welcomed. Most robot parts dont seem adequate to power a
>>>> 100lb vehicle.
>>> Look at the parts sold for the combat bots. They are around the size and
>>> power you are looking at. Here's a store that sells to that market with an
>>> example high power motor:
>>> http://www.robotmarketplace.com/products/NPC-T64.html

>> 1. What's a "shirt shooting vehicle"?
>> 2. How does this thing steer? With four wheels, differential
>> drive won't work very well.
>> 3. See "http://www.roboteq.com" for motor controllers in the
>> indicated range.
>> John Nagle
>> Animats

>
> It is a vehicle with an air powered cannon to shoot T-shirts into the
> crowd of a sports game (basketball) for example. Application is smooth
> floor. You are correct, manuverability will be important to help aim
> the shirt. The cannon mount is fixed, and does not spin, the vehicle
> will need to turn to aim the shirt. Thank you.

OK. Go with two powered wheels, two casters, an
AX2550 Roboteq controller, an R/C receiver, and some surplus DC
gearmotors like these: "http://www.73.com/a/0184.shtml" .

John Nagle

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