Sometimes redoing motor calibration if youâve adjusted any wires or connections can help to reduce the cogging but otherwise like Brian said sensors will eliminate it and can run âhybridâ mode where sensors are used below some erpm since the back EMF is good enough at speed and the hall sensors could be worse, but at low rpm the sensors can basically eliminate any cogging which is nice (particularly on the pneumatic build)
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You not only need TX and Rx, but also a common ground for the devices to communicate.
TX --------------- RX
RX --------------- TX
GROUND ------ GROUND
Also, try 9600 and 115200 bauds.
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What about a pair of lower kv motors - 130/150kv? Or is it just the gear ratio that will makes a difference.
cool. Iâll read up on it some more tonightâŚinteresting stuff.
Isnt the ground on the ppm enough?
This will help you understand what motor kv is specifically.
Motor gearing and kv work hand in hand to balance speed and torque⌠Changing one will affect both.
Generally speaking,
Low kv motors are better for torque
High kv motors are better for speed
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Tested today. The temp remained below 53c. I tested on full charge and cold run too but it just wonât climb the steepest hills like it used to. Funny thing is that I was able to zip up a hill that Iâve considered really steep (Hyde street at Fishermenâs Wharf) Oh well, itâs probably the battery showing its age.
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If itâs not temperature related, then you can also check the battery voltage under load - If it sags low enough to reach the low voltage cutoff, the vesc will reduce power as if the battery was dead.
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Does this regen seem ok, is there any risk that it would be able to overcharge the battery if Iâm going down hill and breaking alot?
I ask as I checked voltage after a ride and before the ride it was 38v and after itâs 41v surprised at how much it recharged
The regen current âsafe limitâ is dependent on the battery pack you have. With those 5Ah Turnigy packs youâre using, the maximum allowable charge rate is 5C, which is five times the capacity. 5 times 5Ah is 25A, so thatâs what Iâd set your max. regen to.
When going down a long hill with a mostly full battery, if the battery reaches âfullâ due to regen, the vesc will stop putting more current into the battery to protect it. This has the unfortunate side effect of the board losing all brakes, as the braking energy has nowhere to go.
Moral of the story is, donât go down hills with a full battery.
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Thanks man will change that, very scary to lose brakes on the hills I am going down!
Agree there. I live on a hill, so I learned that the hard and scary way.
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BumpâŚ
Definitely not ideal since putting the heatsink right up against anything but a fan pushing air over it isnât really ideal over the long term, the extra mass will act as a better heat sink initially but under load over time the heat will just build up with nowhere to go. Believe the vesc default settings have soft temp set to 85C for the PCB/MOSFETs and hard temp at 90C so the temp shouldnât get higher than that so anything touching the heatsink just needs to deal with that or youâd need to adjust the temp settings to keep it cool enough but would be giving up hill climbing and/or working in warm ambient temperature.
Running the cells warm is actually good but hot is bad itâs a balancing act for the chemistry in the cells to optimally deliver the power stored in the battery (ask any Tesla owner in a cold climate)
Yeah that should be good. What about the baudrates?
I Havent tried yet. Will do it on the weekend
Is there a guide or tutorial on how to do conformal coating? Iâm looking to conformal coat a motor sensor pcb.
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So, if I want to have a backup remote for my board, but donât want to open the enclosure to re-bind every time Iâd switch between the remotes, is it even possible?
Iâm using a gt2b with an orange housing for better reliability.
some receivers and remotes will allow multiple transmitters/receivers to bind with them
I âthinkâ gt2b has the capability, but you can try it of science and learn your remote for yourselfâŚ
take your second remote and go thru the bind process and see for yourself if it will allow multiple transmitters to bind with a single receiver
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