Beginner Question Thread! 2023 Edition

gg motor broken? now I don’t get R or L values


edit fixed!(?)

Check all your wires and connections, might have some instability

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That looks like not only are the bearing pockets a bit loose, but the spacer between the bearings is also too long. See if you can find a spacer that’s 1-2mm shorter. Ideally you want the outer race to seat against the wheel just a tiny bit before the inner races bottom out against the spacer.

I’m using Zealous built ins so it’s not a spacer issue. Just an oversized bearing seat

I respectfully disagree. You have two issues: The bearings are loose in their seats radially, and the bearings are also loose in their seats axially.
If it were truly “just an oversized bearing seat”, then the wheel wouldn’t slide up and down like that. It might wobble, or it might have measurable radial play, but it would absolutely not move axially, like at all.

Either your wheels have their bearing seats too deep (doubtful, looks like either bearing will sit flush as expected), or your spacers, built-in or not, are too long for that wheel.

Get some shorter spacers.

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assuming you followed the wizard

try the terminal commands instead of keyboard controls.

ERPM you know is poles x rpm?

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The loose white wire on the FLIPSKY VX1 remote receiver, is that just for reading the battery voltage? (i.e. displaying battery capacity) and not strictly necessary?

Yes and yes

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Would https://hobbyking.com/en_us/turnigy-aerodrive-sk3-6374-192kv-brushless-outrunner-motor.html?___store=en_us be considered a large outrunner? In the VESC tool I have the option to select a small ,medium, large. It says on VESC project’s website that it is 99% chance that it is a medium outrunner, despite the larger size. Then I found a hobby king video stating that it is a large outrunner Turnigy Aerodrive SK3 - 6374-192KV Brushless Outrunner Motor - HobbyKing Daily - YouTube

https://vesc-project.com/node/938

No matter if your motor is 6064 or 80100, the size category is still the Medium Outrunner. For other motor types and sizes, please choose accordingly.

It also weighs: 858g and not nearly 2k as suggested for large outrunners in the VESC tool interface. I am getting conflicting information, which is why I am asking here. I believe it is still a medium outrunner, but I am just not 100% sure

So which one would it be? Thanks in advance

They have the weights listed in the VESC tool. I’ve found that the 750g outrunner works well for most 6374 through 63100 motors. Those options just set the amps that is used during detection, so most of those outrunner modes will work, but if the amps are too low during detection you may get bad results and it will run poorly. If you try to run 50A through a tiny drone motor you will also have a bad time.

The setup process is basically:

Run the motor config saying yes to resetting defaults. Plug in all the correct values like poles, voltages, battery amp limits, etc. After it spins up compare the results between both motors. They won’t be exact but will be fairly close.

Then run the input wizard

Then go for a ride and adjust the motor → current settings until it rides the way you want. Usually 80A is a good max for the motor, and -60 to -80 motor amps for braking. Battery regen affects high speed braking, so setting it higher than the battery’s charge rate is what most people do to get some decent braking at speed. The short pulse of power is probably not a significant concern but we don’t know for sure.

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Thanks a bunch :smiley: Sad that is raining now; but I can at least set it up as a medium and try it dry.

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Anyone know what these wobbly washers are called?


One of mine kind of destroyed itself and I need a replacement but don’t know where to get them or what they’re called. The other hub motors I have might have one I can steal from it but if not I need to buy new ones

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I believe those are called wave spring washers.

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(oversimplified chart, but has major concepts)

As the rpm approaches zero, power approaches zero. Spin the motor faster. When you’re holding it, it’s near or at zero speed.

Set motor current (phase amps in the chart above) higher than battery current. That particular motor is rated for 50A so I would enter 50A and -50A in the top boxes. Setting the battery/power_supply current at 10A or 20A is fine. You won’t have low speed torque if you put low numbers in the top box.

The bottom panel controls erpm and you’re measuring rpm probably. They will be directly proportional by the number of magnetic pole pairs. A 14 pole motor has 7 pole pairs. So in theory erpm = 7 · rpm

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Looks to be the same thing, thanks. The name is pretty descriptive of what they look like but with better words than “wobbly” washer :rofl: The other hub motors don’t use them at all so looks like it is time to try and find the same dimensions online or just try stacking normal washers to take up the same amount of space inside.

It sits between the strator shaft and the bottom bearing which is pressed into the rotor, so I’m not sure how it managed to come loose. It sits on the non moving shaft so it might be a good idea to try putting some locktite on the new one to see if that will stop it from coming off again :thinking: if anyone thinks that is a bad idea please tell me though

enclosure vibrations and how do we deal with them?

I have 1/2 in of eva foam between my deck and enclosure. It goes: Deck->Foam-3dp enclosure and everything in the enclosure is velcroed down, with a few mm space between the battery and foam.

Tight bolts, no washers, glue anywhere there’s no foam or electronics.

Butyl tape as a liner over bolt holes helps with vibrations and waterproofing.

Nylon washers, nylock nuts and nylon spacers do a lot for anti-vibration.

And make sure the sound’s not coming from your drivetrain. It probably is.

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thanks. Butyl tape will look into it. No sounds as of now, but I do want to make sure that vibrations don’t shake any spot welds loose.

The way you see esk8 batteries constructed in 2022 is designed for that to not happen. Put thin foam under each P-group and connect them with flexible wires. OR make a solid brick-style battery that doesn’t flex.

The older 2018-ish methods are bad and you will often get broken welds and other problems.

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This can be interpreted multiple ways, care to clarify?