which motors to buy linobot

[alex kelly]

Hello, 

I'm looking to buy some motors for the Linobot with the aim to building the O'nine.  I have Linobot working on a pair of very cheap motors but I want to extend the robot to use Mecanum wheels (one motor for each wheel) and the extra weight of the kinect and a bigger frame.   Can anyone provide me with any links to decent motors?  I've been going through ali express and motor guides and I'm lost with which ones to choose.  Any help is appreciated.  

Thanks 

[Juan Miguel Jimeno]

Hey Alex,

I'm using these motors for O'nine: https://item.taobao.com/item.htm?spm=a230r.1.14.207.46de6a84oXTc7k&id=568894311585&ns=1&abbucket=6#detail

[alex kelly]

I dont read chinese , google translate wont convert the last page before order though. but it helps me out with specs.   Price looks good though :-) 

Thanks 

[Juan Miguel Jimeno]

Sorry missed that. There’s something similar in aliexpress: https://m.aliexpress.com/item/32814907261.html?pid=808_0000_0131&spm=a2g0n.search-amp.list.32814907261&

Please take note I’m using a 100mm wheel on this. Performance may vary based on your wheel size

[alex kelly]

Thanks so much.  Selecting the motors seams the most difficult thing to do in the project so far, so many variables to weigh up. After completing this linorobot, I'm sure my knowledge of motors will be much improved :-)   We're going to be using 50mm wheels.  Too expensive with uk delivery but I've found these that seem to similar spec. Any thoughts appreciated?  

https://www.aliexpress.com/item/Japan-Namiki-Coreless-Servo-Gear-Motor-DC-12V-120RPM-Gearmotor-With-Encoder/32813911637.html?spm=2114.10010108.1000013.1.21414bb6LXxxGF&scm=1007.13339.90158.0&scm_id=1007.13339.90158.0&scm-url=1007.13339.90158.0&pvid=0542e4c7-d5e3-4250-80b7-268170852464&_t=pvid:0542e4c7-d5e3-4250-80b7-268170852464,scm-url:1007.13339.90158.0

Here's the non mobile link to the wheels Juan recommended for anyone else reading this: https://www.aliexpress.com/item/Belt-Faulhaber-Encoder-Hollow-Cup-Gear-Motor-With-Encoder-2342l012-2342L012CR/32814907261.html

Thanks 

[Dominic Schmidt]

Guess I can give some advice as well. Unless you have very specific needs or spacial restrains it's always smart to go with a motor-gearbox-encoder combo like the one Juan recommended. There are probably thousands available that would suit your robot so here are some things to look out for. When it comes to to the output rpm go for something that has about twice the speed than you would need because you never want to run your motor at 100% for longer periods of time and its nice to have some headroom. 12V seems to be what most people are using so it should be good as long as you have a matching battery pack. There are big variations in current consumption depending on the size of the motor and especially if you use a smaller motor driver like the L298N that can lead to overheating so don't go overkill. I had to actually buy thicker cables for my own robot and a new bms because my motors would draw 40A combined when going uphill. As for the encoder you can gladly go with whatever comes attached since you wont need a high resolution with reduction ratio of 80:1. I hope that could answer some of your questions. Lastly here is a motor that would do the job. Its compact, cheap, offset wheel shaft for more mounting options and small size reliable encoder:

12V 320rpm Electric Gear Box Motor

[Dominic Schmidt]

@Alex,

The rpm numbers on the spec sheet are for the gearbox output, not the motor. Juan said he uses 120rpm for 10cm wheels so I went with a higher rpm for your 5cm wheels.

[alex kelly]

Hey Juan, thanks so much for posting the link.  We received the motors you suggested :-)  I don't suppose you know the encoder wiring (picture below)?  I cant see anything concrete online and don't want to blow it.  

Thanks 

[Juan Miguel Jimeno]

Hi Alex,

I can’t remember how I wired these motors as I replaced the encoders after getting busted from a faulty power supply. Found a reference image from thairoboshop.com, hope this helps.

[Juan Miguel Jimeno]

Hi Alex,

Just wondering how did it go?

[alex kelly]

Hey,

Thanks for asking.  We have the motors, unfortunately we've broken one of the encoders so will need to replace them/it from somewhere.  We've tested the motors and they all seam to be working fine :-)  Which encoders did you buy and where from? 

Here's our gear all ready to assemble, well nearly, just have the wheels currently printing. 

Thanks 

[Juan Miguel Jimeno]

Hi Alex,

Here's where I got my encoder replacement. https://item.taobao.com/item.htm?id=19395287039

I had to remove the plastic case and use glue gun to mount these replacements.