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Topic: Motor for small conveyor belts (Read 395 times) previous topic - next topic

vrederick

Hi i want to build some small conveyor belts that i will program to drop/launch stuff. Now do i have the problem that i don't know shit about motors ( I know you have steppers, DC and Servo, but thats about it ). There are so much motors on the market and they all do something specific. Wish there was a general motor that could do all  :smiley-roll-sweat:.

But my question, what motor would you guys recommend for a project like this. The conveyor belts will not carry a heavy load, lets say two apples (the one from the trees, not the computers).

cheers
Willem

Robin2

How fast do you want the conveyor belt to move?

How many revolutions per minute will that be for the wheel that drives the belt?

How long (time) will the conveyor be expected to work - longer times will need a better quality motor.

I reckon a simple DC motor with a gearbox will be sufficient.

A stepper motor is only needed where very precise positioning is required.

A continuous rotation servo is a neat package of motor, gearbox and motor driver electronics, but I would be a bit concerned that it would not be suitable for a project that requires long running hours.

...R
Two or three hours spent thinking and reading documentation solves most programming problems.

MarkT

Replace adjectives with values.  "heavy load" is not precise, "upto 1kg" is.
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

vrederick

I totally understand,
 
Let's say up to 2KG max
And the speed would be nice if i could control that. I would prefer a good acceleration.

Robin2

And the speed would be nice if i could control that. I would prefer a good acceleration.
Numbers, please.

And also please answer my other questions.

...R
Two or three hours spent thinking and reading documentation solves most programming problems.

vinceherman

to drop/launch stuff.
Please describe what you mean by 'launch'

vrederick

With launch i mean, if the apple on the conveyor belt and is coming off the conveyor belt it will also have some momentum forwards (I don't want to shoot it) but lets say it will fly a meter forwards as it drops.

The speed question is a hard one, i just don't know. But i have to start somewhere and not looking for something extreme, if i build my first one than i can check speeds with results. I would love to control the speed, from slow to normal (i know slow and normal what is that... i don't know)

The conveyor belts will only work for a minute and that 30 times on a day that i would use it. I build a lot of stuff with air-pressure but motors are new for me and really hard to find that first one to test and play with.

I would love to do very precise positioning in the future but i thought that a stepper do's not really know where it's at, so you could better have a servo with a position reading setup.

vffgaston

Hi,
Is the belt totally flat?
How long is it?
Can you make a sketch (hand made will do) with the relative position -and dimensions- of apples, bell, basket, humans, ...?
Regards.

vrederick


vffgaston

here a quick sketch
OK. I'll make some assumptions:

1) You put the apple on the belt because it has been selected/accepted/rejected and want to collect them in a basket together with all the others selected/accepted/rejected.
2) You need to change speed to modify the place the apple will fall down.
3) The belt, once connected, is running continuosly.
4) You don't need to change the speed from one apple to the next.
Are them correct?

Regards.

groundFungus

#10
Jun 20, 2018, 12:26 pm Last Edit: Jun 20, 2018, 12:29 pm by groundFungus
Quote
so you could better have a servo with a position reading setup.
For a conveyor you would need a "continuous servo".    A continuous servo loses the ability to know its position as the positional feedback element (potentiometer) is disabled.

From the Pololu page on such servos.
Quote
Continuous-rotation servos are basically mutilated normal servos that technically do not deserve to be called servos because they lack the feedback control that is the hallmark of any servo system.

Robin2

but lets say it will fly a meter forwards as it drops.

The speed question is a hard one, i just don't know.
Actually the speed question is very straightforward. If you want the apple to fly forwards one metre before it hits the floor it is easy to calculate the speed it requires when it is launched. And the required speed will depend on how far the apple can fall.  Google v=u+at

...R
Two or three hours spent thinking and reading documentation solves most programming problems.

vrederick

OK. I'll make some assumptions:

1) You put the apple on the belt because it has been selected/accepted/rejected and want to collect them in a basket together with all the others selected/accepted/rejected.
2) You need to change speed to modify the place the apple will fall down.
3) The belt, once connected, is running continuosly.
4) You don't need to change the speed from one apple to the next.
Are them correct?

Regards.
correct

vffgaston

Hi,
I guess the motor you need is not bigger than 1/2 HP (It depends on the conveyor length and how many apples are on it).
The safest -and more accurate- is to use a conventional AC motor plus a frequency converter; there are many on the market. You dont need an arduino at all.
Regards

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