Motors

[mattdall69]

Hello everyone...can you help me. I'm a teacher, so straight from the get-go, money is an issue for components.

I'm building a Line following 'bot with ldrs and transistors. Got everything worked out and built, but I need a small motor with torque to move it (I've built a prototype with solar motors, just to see if electronics work).

Any suggestions on cheap little powerful motors to do job? A link would be nice.

Many thanks.

 

[Arouse1973]

Hello Sir
How fast do they have to go, and are you going to use any gearing? What is the working voltage and supply current available. What space do you have?
Thanks
Adam

 

[mattdall69]

Hello there. Its about 200mm x100mm..very light- laser cut acrylic. I have a motor with gearbox, but was hoping to run the wheels straight from motor...I want a slow motor with a bit of strength. A worm gear wont do..or solar.

It'll run from 4.5 - 9 v.

I want to keep I small for costs.

Thank you.

 

[Arouse1973]

Hello there. Its about 200mm x100mm..very light- laser cut acrylic. I have a motor with gearbox, but was hoping to run the wheels straight from motor...I want a slow motor with a bit of strength. A worm gear wont do..or solar.

It'll run from 4.5 - 9 v.

I want to keep I small for costs.

Thank you.

An easy option would be to modify some small RC servos. They have fixings for the body and a screw hole for different types of horns, one being circular with holes in them, so you could connect this to a wheel.
Adam

 

[mattdall69]

Yeh..im not familiar with servos. Do you have a link for me? Much appreciated.

 

[Arouse1973]

Yeh..im not familiar with servos. Do you have a link for me? Much appreciated.

Here is some info about modifying them. It's quite easy. Also a link to a supplier. This will give you an idea of the specs and what they look like. You can then try and find some cheaper ones.
Thanks
Adam

http://www.servoshop.co.uk/

 

[Arouse1973]

Saying that....... These are £3.65 each
http://www.servoshop.co.uk/index.php?pid=EMAXES08AII&area=Servo

 

[Gryd3]

Saying that....... These are £3.65 each
http://www.servoshop.co.uk/index.php?pid=EMAXES08AII&area=Servo

Adam, can these be controlled easily enough without a microcontroller?

To the OP.
These line followers, do you have a BillOfMaterials or schematic we can see?

I've built one of these in school and it used an H-bridge IC and a comparator. Is this the same approach you are taking?

 

[mattdall]

Here is some info about modifying them. It's quite easy. Also a link to a supplier. This will give you an idea of the specs and what they look like. You can then try and find some cheaper ones.
Thanks
Adam

http://www.servoshop.co.uk/

Thanks for your help.

 

[Arouse1973]

Thanks for your help.

Your welcome Sir

 

[mattdall]

Adam, can these be controlled easily enough without a microcontroller?

To the OP.
These line followers, do you have a BillOfMaterials or schematic we can see?

I've built one of these in school and it used an H-bridge IC and a comparator. Is this the same approach you are taking?

Hi there. No i'm just building a prototype. Using darlington pair and solar motor (Two identical circuits, one for each motor.) I've actually got it working, but i could do with a slower motor with more torque?