Hi, I am trying to build a remote control lawnmower using 2 x MY6812 24v 150w motors (https://www.motiondynamics.com.au/united-my6812-24v-dc-150w-2750-rpm-ele...) in a skid steer configuration. I need an esc that will control both motors forward, back, left and right like the guy in the following link but with bigger motors, and work off an R/C receiver.
https://www.instructables.com/id/Control-a-Robot-with-a-RC-Transmitter-R...
I have found a few like this but none that can handle the above mentioned motors. I could get the 12v 100w version but I think the 24v 150w version would go better on the lawnmower.
Any help would be appreciated as the guy at our local hobby store in Canberra, Australia says it can't be done and isn't much help at all.
Thanx.
Hi VESC1
I'm not sure if I understand your goal, but if you want to control the mower like a tank with two tracked drive there are quite a lot of possibilities. But this is always done with one RC control but two channels (back/reverse + left/right). RC controls with a Delta mixer (channel 1 is influencing channel 2 and vice versa) could do such things or ext. controllers.
One 24V capable (24A) could be this one
http://www.cti-modellbau.de/CTI-Fahrregler/-74-130-131-164-353.html
.A mixer could be (esp. build for tracked tanks/cars/boats):
https://www.modellbau-regler.de/shop/product_info.php?products_id=124
Cheers
Sam
Pedelec usage in combination with a GoldenMotor MagicPie3 BLDC
I want to control 2 motors from 1 electronic speed controller (esc) that can handle a minimum of 10A per motor that runs of 2 channels of a 4 channel remote control receiver using 1 stick only. It will be in a skid steer configuration meaning that when I push the stick forward it goes forward, when I push the stick to the left the right motor goes faster turning the mower left, when I push the stick to the right the left motor goes faster turning the mower right and pushing back on the stick makes both wheels go backwards. There will be a free spinning front wheel for stability. I've heard that it's better to have the esc to do the mixing of the channels, like the one in the link I posted but with a higher amp rating (and hopefully reasonably priced).
Sorry I could not understand you links or why you posted them in a different language. Thanx for the effort though :)
Thanx,
VESC1
Hi
then my thought solution is oneway to your goal. If your remote offers such a Delta mixing function you only need two normal ESCs (the motor you are using is much lower in it's spec than the current ones (Bühler with about 800W each) in my Mono Boat. I wonder why your local dealer tells you there's no way as the motors are quite common in it's specification. Most switched to BLDCs nowadays, but good Brushed ones are just heavier and bulkier, but offers great lowload, low RPM control compared to BLDCs. Problematic will be the go straight forward as most motors tends to have a small difference in speed which affects the straightness.
The links are the because I own both of this controllers (the Thor is the one I'm using in a Tamiya tank. I see no difference in using the "cheap" function of the remote or in the RC, but as I have a few modells and a very old RC (no Profiles, just one) I prefer to have special functions build into hardware instead of software.
Cheers
Sam
Pedelec usage in combination with a GoldenMotor MagicPie3 BLDC
I have read that mixing with the remote can cause dead spots on the diagonals meaning that your vehicle will stop if you move the stick to certain positions, which is why I would prefer 1 esc to do the mixing.
As for the local hobby dealer, apparently he does that alot :(
I did appreciate the links, I just would have preferred them in English so I could read them and since that's the language I asked the question in.
Thankyou for you replies, I originally planned on using 2 esc's however being a lawnmower I'm controlling, I don't really want any dead spots or controller malfunctions. That being said, I have not tested that theory and if I can't find my esc or it's way over priced then I might have to go back to the 2 esc idea.
Thanx,
VESC1
Hi VESC1
Language: as I do only know that controller (doing the mixing+ESC for you) it's the only working and approved solution I'd offer.
As I have most of my boats without a rudder, but doing the steering by the motors. It's not common, but done right it works and let you rotate on the spot, which is sometimes worth a lot.
I don't see why there should/could be a dead spot, but I've a) the Thor doing all the work, b) the Kettenmixer doing the mixing + 2 normal ESCs doing the hard work and in one situation a delta mixing (meant for V-shaped tailwing planes like my F18 Hornet) in the (dedicated) RC control. All work, but have the disadvantage of never going pure straight, which is caused by asynchron motor drives. BLDCs are much more reliable for such a work as the ESC could control the eRPM, while a normal brushed could not do such a thing (without feedback encoders anyway). Most RC Controls nowadays have very good mixers build into, which allows you to change the mixing to your liking. One of such an RC control is my (dedicated) FlySky_FS6_T6_RB.
As mentioned: all three works as intended. While the a) solution is integrated, but expansive, b) offers to use the ESC you like c) is the cheapest, as this simple mixing is done by the uC in the RC control.
A real life working version is the typ. Roomba VC. It has two drive motors and never go straight, but could move on the spot and very small areas around obstacles.
Cheers
Sam
Pedelec usage in combination with a GoldenMotor MagicPie3 BLDC