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roopakjada
12-26-2011, 10:19 PM
I need a motor kit ( motors + encoders + wheels + mounts(not compulsory) ) the main application is a fast line follower
Rough Specifications
capable of minimum 2m/s with the stock wheel supplied
small size- the total length of the 2 motors+ wheels < 20 Cm
Torque > 8 Kg/cm
Voltage ~ 9V-12V
ready to buy internationally
budget - 4,000
any suggestions ?

allbits
12-27-2011, 10:24 AM
you cant get a good encoder - dcmotor - gear head for that price.
FOrget international shipping at that price.

Also, the rpm depends on the load, in this case, is also about the weight of the vehicle. If there is a strict budjet, go for the encoders at nex-robotics. But the motors that suit it are heavy, and works at 12V, which will not be a good idea for a 'fast' line follower. Definitely not good for 2 m/s

At 2m/s, you will need a good combination of electronics and mechanical design, CG considerations and fast sensing. 50K is what i am looking at.

roopakjada
12-27-2011, 10:34 AM
Hmm well i meant 4000 excluding shipping per motor, is that less? i thought it was good enough :( nevertheless let me know about the best possible option i'd get at this price :)

vikas
12-27-2011, 02:15 PM
Like allbits said , budget is too just too low. You can check my article on line follower , it is pretty fast but it almost cost around Rs 8 to 10 k after import and shipping.

I did manage 1 m/s + over a weekend , using the round design but for going faster you need diffrent setup configuration and faster motors.

Anyhow here is a complete off the shelf build of a 2.1ms follower

http://webdelcire.com/wordpress/archives/619

Should cost around 10k after everything is done.

roopakjada
12-28-2011, 08:54 AM
my total budget is 10000 only for the motors i meant 4000 per motor without shipping charges.I've seen ur article nice one :) i just wanted motors with more power Nice link will look into

allbits
12-31-2011, 10:28 AM
good link Vikas !

@roopak : The motors depends a lot on the lines, and the size of the vehicle. If this is for a competition, you will have to check the rules to see if they specify any max-min angles of the line. The length of the machine depends very much on the angles.

Also, you need not have an encoder if you are not tracing back the line for a speed run. You can cut that part.

here (http://in.element14.com/jsp/search/browse.jsp?N=203033+110197586+110130301+110151830+ 110166195&No=0&getResults=true&appliedparametrics=true&locale=en_IN&divisionLocale=en_IN&catalogId=&skipManufacturer=false&skipParametricAttributeId=&prevNValues=203033&filtersHidden=false&appliedHidden=false&autoApply=false&mm=1001922||,1002737||,&originalQueryURL=%2Fjsp%2Fsearch%2Fbrowse.jsp%3FN% 3D203033%26No%3D0%26getResults%3Dtrue%26appliedpar ametrics%3Dtrue%26locale%3Den_IN%26divisionLocale% 3Den_IN%26catalogId%3D%26skipManufacturer%3Dfalse% 26skipParametricAttributeId%3D%26prevNValues%3D203 033) are some of the good motors you can look at.

Also, here (http://in.element14.com/jsp/search/browse.jsp?N=204234&No=0&getResults=true&appliedparametrics=true&locale=en_IN&divisionLocale=en_IN&catalogId=&skipManufacturer=false&skipParametricAttributeId=&prevNValues=204234&filtersHidden=false&appliedHidden=false&autoApply=false&originalQueryURL=%2Fjsp%2Fsearch%2Fbrowse.jsp%3FN% 3D204234%26No%3D0%26getResults%3Dtrue%26appliedpar ametrics%3Dtrue%26locale%3Den_IN%26divisionLocale% 3Den_IN%26catalogId%3D%26skipManufacturer%3Dfalse% 26skipParametricAttributeId%3D%26prevNValues%3D204 234) is a list of gear heads you can fit into. These are expensive, comes to approx 20k for a couple of motors with gear head.

You can alternatively look at faulhaber or portescap motors, but the cost will more or less be around this figure. These are the motors normally used in competitions, and performs really well. The best things about these motors are the datasheets. You get the correct data you require for the design, while the ones you pick up at shops may not have the correct spec.

Also, the speed of the machine depends a lot on the speed it takes the curve, you might have to use an inertial measurement system to take care of the drifts. all these, are relevant in high speed machines. Also, the wheels and tyres are equally important,and people dont normally give importance to them, especially Indian hobbyists. Handle more error in the hardware, and you will have to handle MUCH LESS error in software.
good luck.

roopakjada
01-01-2012, 01:32 PM
Wow thanks for the links way more than my budget but will try i'm simply amazed with the variety available i shall try to go for them also some competitions do not allow ready made sensors so im looking to build one myself but the normal pairs available are no good i've tried TCRT5000 any other options would like some pointers in that direction by the way happy new year :)