Heavy Duty Motors.

Question

I am interested in building an Omnibot 2000 or Omnibot 3000 from the scrap... Using fiberglass... But I would like to know which motors shall I use to bear the weight (about 12-15 Kgs) and drive them... I would even prefer some suggestions on which motor driver compatible to EZ-B to be used... Guys, please guide me in the same...

pranav · Answer

I still couldn't figure out a way guys... I need some help... stress stress stress

CardboardHacker · Answer

your looking for motors? well, wheel chair motors can take a whole lot of weight. but you want something much less so search for 15kgs dc motors. figure out the amperage and find a motor controller that works with those motors amperage. Sabertooths are compatible with the ez-b. there are many people such as myself who know how to wire up a sabertooth to the ez-b. just ask. Almost all motor controllers can be controlled by the ez-b one way or another, so just ask and we can probably figure it out.

rgordon · Answer

@pranav Here is the link to the place that I got my motors. My robot weighs about 100 lbs now and the motors have no problem pulling him around. I used the 12V motors. You will need to get a "Right Hand (RH)" and a "Left Hand (LH)" www.robotmarketplace.com  I am using the sabertooth2x12 dual 12A motor driver. It works great with the EZ-B. If you want something a little smaller you could use the tank style drive section from a R.A.D. robot. Others have used these but I am unsure exactly how much weight they will carry. Search the EZ Forum for ideas. www.ebay.com

pranav · Answer

@rgordon, Thanks a lot...That's really useful...

jstarne1 · Answer

@Gordon is that what your using? I really like your because they are quiet. Something I really want for Jarvis.

rgordon · Answer

@Josh- Yeah. I am using the AME 218 Series 212 in-lb. (RH) Right Hand and (LH) Left Hand. They are a little pricey but I wanted pulling power. I will double check the part number when I get home to be sure.

pranav · Answer

Here is the link of a motor driver I would like to use for my robot, Is it compatible to EZ-B? https://robokits.co.in/shop/index.php?main_page=product_info&cPath=73&products_id=342

jstarne1 · Answer

I took a look at that controller , it uses TTL interface so you can use it but it does not look like it could handle the current rating it claims and does not have a heat sink of any kind. That being said get a sabertooth 2 x 12 or model of your preference because the sabertooth has a great reputation , there are tutorials and they include heat sinks for continuous use.

pranav · Answer

@jstarne1... Thank you.. But the problem is Sabertooth is not available in India and I can't afford to import it.. So I am looking for some inexpensive dual motor driver... But I was wondering if I can add any external heat sink to the driver... Is it possible? If so, how? I am using the following motors... https://robokits.co.in/shop/index.php?main_page=product_info&cPath=2&products_id=186 So any other inexpensive motor driver replacement for it?

pranav · Answer

The motors have an amperage of 7.5 Amps max and the motor driver can deliver up to 20 Amps... But it doesn't have a heat sink.. Can the motor driver be used without heat sink as we have an the motors amperage is only 7.5 Amps?

jstarne1 · Answer

@pranav there's not a practical way to attach a heat sink to the regulators because they soldered them face down to the PCB . that being said you could just use a small fan like a 80mm PC cooling fan over it should work. Since the motors are only rated at 7 amp stall this controller should he fine if there is any truth to the specifications posted.

robohobo · Answer

Im not sure if you can get these in India either, but have you looked into Robo Claw or SyRen? both of these motor drivers are similar to the sabertooth and are available in different amp ratings.

pranav · Answer

Thank a lot for your valuable suggestions guys... But unfortunately both the above mentioned motor drivers are unavailable in India...

Dave Schulpius · Answer

Personally I would use this motor driver if I were you. I use a few Pololu Motor Drivers in my robot and am very happy with them: Dual VNH3SP30 Motor Driver Carrier MD03A www.pololu.com/catalog/product/707 It's a little compact and powerful driver that's capable of continuous 9 amp and max 30 amp. Highly protected. Supply voltage can be between 5.5 and 16 vdc. It's pricy at about $50 USD but will worth it. It has no heat sink but you may not need one and can always add one. Here's a statement taken from the description of this Motor Driver:
 The motor drivers have maximum current ratings of 30 A continuous. However, the chips by themselves will overheat at lower currents (see table above for typical values). The actual current you can deliver will depend on how well you can keep the motor drivers cool. The carrier printed circuit board is designed to draw heat out of the motor driver chips, but performance can be improved by adding a heat sink. In our tests, we were able to deliver short durations (on the order of milliseconds) of 30 A and several seconds of 20 A without overheating. At 6 A, the chip gets just barely noticeably warm to the touch. For high-current installations, the motor and power supply wires should also be soldered directly instead of going through the supplied terminal blocks, which are rated for up to 15 A

Good luck and have fun, Dave Schulpius

pranav · Answer

@dschulpius.. Thanks.. that's a good option for me.. I'll try to get one...

Dave Schulpius · Answer

Outstanding! Let us know if you get one and if it works for you.

MovieMaker · Answer

I once had motors that looked just like that. I went to the junk yard and got two windshield wiper motors used. They worked good on my robot. But, it was 12V and it was in 1978.

Antron007 · Answer

Sorry to waste the post but I want to watch this thread and I don't know of any other way to subscribe to it for the update email.

pranav · Answer

I made my robot with normal foam board... So it's not that heavy... I used an L298n motor driver and now it works perfectly fine.. But all the replies to the forum are very useful for anyone looking for heavyduty motors and controllers...

pranav

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