I’m putting together a motorized “mobility walker” (think a very wide e-board with hand rails) - designed to run at very slow speeds. Busily accumulating parts to experiment with (e.g., hub motors with reasonable performance at low RPMs). Zeroed in on a couple of custom winds that Hummie is putting together, and the Maytechs.
I’ve just turned by attention to VESCs - I expect to be running FOC mode and relatively high amps. The new FOCBOX looks like a good unit, but it’s not clear they’re shipping (taking pre-orders). Can anybody suggest something that has the latest chips, can handle high amps, supports FOC, is reasonably reliable, has a solid vendor, and will actually ship if I place an order? (If it makes any difference, I’m going to use a pair of them, or 2 channels, and tank-mode differential steering - i.e., turn left by sending power to the right-hand motor. I also expect to use hard-wired controllers - don’t need wireless.)
I talked to Enertion chat a few days ago and if you order today, the shipment will “likely” go out in mid/late August. Sounded like they have one wave going out in the next week and it takes ~3-4 weeks to fill each consecutive shipment.
AFAIK DYEe’s Torque VESC is the base VESC - not upgraded with exception to Vedders recommendation (hence the lower price vs FOCBOX/Ollin). Not sure what that means in terms of your board, if it can handle the higher Amps is up to your usage.
I would recommend to go for VESC Six. Benjamin Vedder spent the last two years making the new Software VESC-Tool and the new firmware for VESC Six. Three shunt measuring will make nearly any motor run perfectly smooth in FOC. 80A continuous is no issue.
I strongly discourage the Maytech VESC, especially for high current and/or FOC. @torqueboards’s VESCs are good though. They do have slightly upgraded parts compared to the original Vedder BOM. If you can wait for it, a VESC 6 would be a very good option as well.
I’ve been looking at several different motors, with peak amperage up to about 30 amps.
I expect to be running at 3-5mph max speeds, which is at the really inefficient end of a DC motor’s power curve. That says high amps to me. I won’t really know for sure until I actually try things out. So… I’d rather over-specify all the electronics, than have stuff melting or blowing up.
Your Project sounds interesting. Try to use gearing and skip the hubs. Precise sensors are what you want. E.g. AS 5047 magnetic sensors. A very smooth startup is essential I guess. Benjamin implemented Hall, ABI and AS 5047 in the new software.
I know - gearing is a lot more efficient. But also requires more maintenance. I’m building this for a 97-year old guy who wants nothing to do with things like tightening belts, or cleaning road dirt out of gears. So I’m going to see if I can get the performance and battery life that I need (say, an hour of runtime on a charge) out of a hub motor, before resorting to gearing. (The other approach is to use something like a hoverboard motor, that’s designed for lower speed operation. But the weight gets rather high.)
Can you say more about the sensors? The motors I’m looking at have hall effect sensors built in.
Hall is not very precise. 97 years is probably in the category of AS5047. These are magnetic sensors. A diametral magnetized magnet spins above a chip that reads out the angle value very very precise. So you know exactly where the rotor is. This helps to spin up with precision and lots of torque.
I’ve had very good customer service and reliability from Dexter and his Torqueboards not-vescs and other products as well. They’re usually actually available to ship which is nice as well. I do also have 2 focboxes on the way from a group buy so we’ll see how those compare to the 5 Torqueboards notvescs.