ESK CALC, here's a new one

[mmaner]

@tipsy

3ds calc asks for motor power rating plus voltage and spits the torque based on that.

Thats what is confusing me, Im not sur emany people will know the motor power ratings. Does that mean I need to populate that field with a selectable list of values or have a default that is average or what?

[mmaner]

@Flasher

I always get batteries that aren’t really used by anyone

I dont. I have a dozen 30q packs, just now getting ready to make a 40T or p42a pack .

[Flasher]

@mmaner

I have a dozen 30q packs

I’m not murican. 30q cost a hell of a penny for me. 4.50/cell +shipping is the best deal I’ve seen in a bit for myself

[mmaner]

I can dig it. Honestly, I hate building batteries, like a lot .

[tipsy]

You already have voltage(s_count), so the only extra field needed is either motor power OR motor amps, I’m not sure which one is more convenient from a UX point of view.

Plus, there needs to be a selection box for 1WD/2WD/4WD, since total torque doubles when you double the motors (if amps unchanged).

[mmaner]

@tipsy

I’m not sure which one is more convenient from a UX point of view.

Me either, Ill do some research and see which is more available.

@tipsy

there needs to be a selection box for 1WD/2WD/4WD, since total torque doubles when you double the motors (if amps unchanged).

Im glad you mentioned that. I wouldve hated to build all this and then realize I needed to double it .

[Venom121212]

I’d avoid the motor power ratings. They’re always inflated. I’d just use the set voltage (already done) and max amp rating calculated by cell discharge times p groups (already done)

[mmaner]

I can do that.

[tipsy]

@Venom121212

and max amp rating calculated by cell discharge times p groups

But then we’re mixing battery amps and motor amps

example (single drive for simplicity):

setup 1:
20 battery amps, 80 motor amps

setup 2:
80 battery amps, 80 motor amps

both will produce the same peak torque (at low duty cycle), but setup 1 will start dropping torque at 25% duty cycle, while setup 2 will maintain peak torque all the way to 100% duty cycle (95% technically).

That’s why an extra input field for motor power or amps is needed for motor torque numbas

[Jc06505n]

Even the Hoyt Drivetrain Slipped for you ?

[mmaner]

It’s 15/36 isn’t it? But no, I’ve never had any slippage with it.

[Jc06505n]

I assume from their listing of the motor pulley it’s 12T:

HTD 5M-12T 1018 Steel Motor Pulleys (Set of 2)

[mmaner]

I’ll double check, but I’m pretty sure mine is 15t.

[Gamer43]

Wiki: What Motor Parameters Mean

Quick run down on what the hell motor parameters mean during detection, and how you can use them to help in your calculations Resistance: The line to neutral (from ESC terminal to center tap of motor windings) resistance of each phase of the motor. This determines how much heat per ampere is dissipated inside the motor. The equation is approximately: For FOC: [image] For BLDC it’s : [image] Where I is motor current, R is phase resistance. This does not include things like bearing losses, …

Might be useful to add.

Flux linkage basically tells you everything.

[mmaner]

Looks like I’ve got some studying to do. Thanks

[fessyfoo]

3ds calc was doing somethign funky confusing.

Noob question thread! 2020_Summer

ahh yes. the calc isn’t paying any attention to how many amps your battery can send it to figure out max torque. try changing the p group size it doesn’t affect the torque numbers. I think it’s computing max torque using the power rating of the motor and the max voltage of the system to figure out a max amps. and from there multiply by amps/nm x n motor x gearing So that’d be max amps at max speed. II would think low end torque could be higher than that value. like torque/duty_cycle …

[Venom121212]

Oooh that’s very much correct. Motor amps is the right choice. Don’t tell anyone but I set my motor amps higher and higher until they get too hot

[mmaner]

Ok, made some changes (updates).

1. Added VTC6 cell values
2. Added 2 fields for user definable cells
3. Added save and load functions
4. Added a send function, non-operational for now

The send function is 90% built, but as the hosting is at GitHub I have no way of sending the data. I’ll eventually finish that function.

I have been doing some research on the torque values, it’s coming, I think, It’s just going to take some more work.

Let me know if there’s anything else you guys want to see.

https://mmaner.github.io/esk8calc/

[Jujo]

Thanks for doing this Mike! Much much helpful resource

[mmaner]

no worries brudda, happy to help.