X-File: Understanding VESC: the difference between "battery amps" and "motor amps"
Hummie, post:236, topic:15995, full:true Wrote:@Ackmaniac you obviously have a problem that won't be fixed by adjusting the settings and I've never heard of the setting changing anything as drastic as you're experiencing.   You've got a real issue.  Maybe you're hitting a voltage limit.  that's the only thing I can think of

@Hummie actually i think @Ackmaniac's "problem" will be fixed by adjusting the batt/motor/absolute amp max settings.

to avoid all "cogging," "Motor Amp Limit" may have to go above "200" arbitrary limit.

",0,2,http://www.electric-skateboard.builders/t/understanding-vesc-the-difference-between-battery-amps-and-motor-amps/15995/237,2017-02-01 06:35:39 UTC
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Ackmaniac, post:238, topic:15995 Wrote:What is the reason that it should be fixed by adjusting it to your batt/motor/absolute amp max settings. Does some magic happen? At the moment i get a overcurrent error with 10/10/10. Why should that be fixed by setting it to 10/150/150.

Ackmaniac, post:233, topic:15995 Wrote:10/40/40



@Ackmaniac as previously mentioned:

10/10/10 gives full throttle @ standstill = 1.6W (0.04A battery amps)

10/40/40 gives full throttle @ standstill = 25.6W (0.673 Battery Amps)

10/150/150 gives full throttle @ standstill = 360W (9.47 Battery Amps)

Ackmaniac, post:213, topic:15995, full:true Wrote:1 motor
0.016 resistance
360 watts
10S liion
Even acceleration.

@Ackmaniac In simple terms you said that you wanted full throttle @ standstill (& all phsically possible rpms) = 360W (9.47 Battery Amps).

10/150/150 gives full throttle @ standstill = 360W (9.47 Battery Amps)

10/10/10 (1.6W) and 10/40/40 (25.6W) are no where close to 360W @ all physically possible rpms.

",0,0,http://www.electric-skateboard.builders/t/understanding-vesc-the-difference-between-battery-amps-and-motor-amps/15995/239,2017-02-01 08:31:40 UTC
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Ackmaniac, post:240, topic:15995, full:true Wrote:I never said i wanted full throttle at standstill, Just forget the standstill.I do a kickpush so standstill doesn't exist in my world. When i pull the trigger i am moving already. I wanted even acceleration and no fault when i do full throttle.

@Ackmaniac It isn't "even [feeling] acceleration" a.k.a "full throttle = xxxx.xx watts electrical @ all physically possible rpms" if you don't have 360W electrical available @ full throttle standstill

devin, post:208, topic:15995 Wrote:desired battery watts @ full throttle at all physically possible rpms <-typically constant


Ackmaniac, post:213, topic:15995, full:true Wrote:1 motor
0.016 resistance
360 watts
10S liion
Even acceleration.

10/10/10 gives full throttle @ standstill = 1.6W (0.04A battery amps)

10/40/40 gives full throttle @ standstill = 25.6W (0.673 Battery Amps)

10/150/150 gives full throttle @ standstill = 360W (9.47 Battery Amps) <-- this is your stated goal

@Ackmaniac

",0,1,http://www.electric-skateboard.builders/t/understanding-vesc-the-difference-between-battery-amps-and-motor-amps/15995/241,2017-02-01 08:38:52 UTC
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Ackmaniac, post:242, topic:15995 Wrote:But for me 10/10/10 feels like even acceleration.

@Ackmaniac

10/10/10 gives full throttle @ standstill = 1.6W (0.04A battery amps)

that's not 360W.

10/150/150 gives full throttle @ standstill = 360W (9.47A battery amps)

that is 360W.

Ackmaniac, post:213, topic:15995, full:true Wrote:1 motor
0.016 resistance
360 watts
10S liion
Even acceleration.

",0,1,http://www.electric-skateboard.builders/t/understanding-vesc-the-difference-between-battery-amps-and-motor-amps/15995/243,2017-02-01 08:46:05 UTC
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Ackmaniac, post:244, topic:15995 Wrote:But forget the even acceleration.

@Ackmaniac here is what some riders want:

full throttle = xxxx.xx watts electrical @ all physically possible rpms (even very close to 0rpm)

some would say this "feels like" even acceleration.

@Ackmaniac in your case you said the value should be 360W

10/150/150 gives full throttle = 360 watts electrical @ all physically possible rpms (even very close to 0rpm)

Ackmaniac, post:213, topic:15995, full:true Wrote:1 motor
0.016 resistance
360 watts
10S liion
Even acceleration.
Hummie, post:41, topic:16953, full:true Wrote:I ride 200 motor amps.  I have almost no cogging and super smooth acceleration
devin, post:24, topic:15995 Wrote:I consider the 48/200/200 test a success because the VESC didn't snap, @Hummie rode around the block, and the $100 I put down on the VESC is safely back in my pocket. (and low speed "cogging" is basically eliminated, acceleration is much quicker and steadier) Big Grin

i asked @Hummie if he plans to go back to his old settings and his answer was "no."
^ This test was equivalent to full throttle = 1660 watts electrical @ all physically possible rpms (even very close to 0rpm)

",0,1,http://www.electric-skateboard.builders/t/understanding-vesc-the-difference-between-battery-amps-and-motor-amps/15995/245,2017-02-01 08:51:39 UTC
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Ackmaniac, post:246, topic:15995, full:true Wrote:Ok, maybe i didn't make my point clear. My acceleration is 0 when i do full throttle.When i follow your advice i get a overcurrent error. And you advice me to use more current. Why should that help.And why does hummie not have this error. Do you have a answer? Because posting statements of other persons over and over again doesn't help me with my problem.

devin, post:224, topic:15995 Wrote:i can only assume this 0.42105% duty cycle @ full throttle @ 0 rpm is too low for the VESC and results in some type of mathematical logic error in the VESC.

@Ackmaniac you have not followed my advice. You have not tested 10/150/150.

I have already explained that 10/10/10 gives 1.6W and 10/40/40 gives 25.6W at full throttle standstill, far too low W to cause any appreciable mechanical motion in a human sized mechanical load.

It is no surprise you always have to push to get going.

Ackmaniac, post:240, topic:15995 Wrote:I do a kickpush so standstill doesn't exist in my world. When i pull the trigger i am moving already.


I've further explained the very settings (10/10/10 & 10/40/40) you've chosen have likely introduced a VESC mathematical logic error.

",0,4,http://www.electric-skateboard.builders/t/understanding-vesc-the-difference-between-battery-amps-and-motor-amps/15995/247,2017-02-01 09:07:45 UTC
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Ackmaniac, post:248, topic:15995 Wrote:And 10/150/150 shouldn't have that problem. I am not a expert but don't you think it could be another problem?

@Ackmaniac Yes. Exactly. 10/150/150 gives 360W @ full throttle standstill which might be barely enough W to cause appreciable motion in a human sized mechanical load at standstill.

Ackmaniac, post:240, topic:15995 Wrote:I do a kickpush so standstill doesn't exist in my world. When i pull the trigger i am moving already.

I personally have observed successful testing of my VESC [at the time] at 1660 W equivalent full throttle standstill settings (48/200/200) on a single, funny-looking, large hub motor.

",0,2,http://www.electric-skateboard.builders/t/understanding-vesc-the-difference-between-battery-amps-and-motor-amps/15995/249,2017-02-01 09:25:55 UTC
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Ackmaniac, post:250, topic:15995, full:true Wrote:I will stop poking you. Seems that you don't have a answer for my problem. So i will continue with my old settings where i don't get the overcurrent error.



@Ackmaniac in simple terms you won't try 10/150/150 = 360 W electrical @ all physically possible rpms (even very close to 0 rpm)

so in simple terms you never actually intended to test my advice, even though you asked for it.

despite:

Ackmaniac, post:205, topic:15995 Wrote:One question. I set my VESC to 10/10/10 for testing and it shuts down every time I give 100% throttle. Why is that? By the calculations it shouldn't be a issue.

devin, post:212, topic:15995 Wrote:@Ackmaniac with the requested info, I can provide you an answer.

Ackmaniac, post:213, topic:15995, full:true Wrote:1 motor
0.016 resistance
360 watts
10S liion
Even acceleration.
devin, post:247, topic:15995 Wrote:10/10/10 gives 1.6W
devin, post:249, topic:15995 Wrote:10/150/150 gives 360W @ full throttle standstill which might be barely enough W to cause appreciable motion in a human sized mechanical load at standstill.
Ackmaniac, post:250, topic:15995 Wrote:So i will continue with my old settings
Ackmaniac, post:240, topic:15995 Wrote:I do a kickpush so standstill doesn't exist in my world. When i pull the trigger i am moving already.

",0,0,http://www.electric-skateboard.builders/t/understanding-vesc-the-difference-between-battery-amps-and-motor-amps/15995/251,2017-02-01 09:33:27 UTC
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Ackmaniac, post:252, topic:15995, full:true Wrote:You are absolutely right. I will not try these settings because i get already an error with lower settings. So it would be stupid if i go higher with the values.

I feel like i went into a mental hospital and poked a patient with a stick over and over again. So i should stop here.

@Ackmaniac you haven't tested whether or not the "error" is caused by the lower settings.

Clearly the lower settings ARE the cause of the error because you already admitted you didn't have the error using your old, higher settings.

Also, you admitted you ARE planning to use higher settings, because that's what your OLD settings were.

Also, you have implied these higher settings will correct the "error".

Also, despite asking my advice, you refuse to test whether 10/150/150 gives full throttle = 360W electrical @ all physically possible rpms (even very close to 0 rpm)

Ackmaniac, post:205, topic:15995 Wrote:One question. I set my VESC to 10/10/10 for testing and it shuts down every time I give 100% throttle. Why is that? By the calculations it shouldn't be a issue.

devin, post:212, topic:15995 Wrote:@Ackmaniac with the requested info, I can provide you an answer.

Ackmaniac, post:213, topic:15995, full:true Wrote:1 motor
0.016 resistance
360 watts
10S liion
Even acceleration.
devin, post:247, topic:15995 Wrote:10/10/10 gives 1.6W
devin, post:249, topic:15995 Wrote:10/150/150 gives 360W @ full throttle standstill which might be barely enough W to cause appreciable motion in a human sized mechanical load at standstill.
PXSS, post:46, topic:16953 Wrote:I dont disagree with the math.
Ackmaniac, post:250, topic:15995 Wrote:So i will continue with my old settings
Ackmaniac, post:240, topic:15995 Wrote:I do a kickpush so standstill doesn't exist in my world. When i pull the trigger i am moving already.
longhairedboy, post:44, topic:16953 Wrote:Christ i'm tired of the virtual lynching that's going on here. Devin isn't wrong. He's just vocal, and people are getting board with it. Find something else to get bored with, like alt-facts.
@longhairedboy LOL :joy:

",0,1,http://www.electric-skateboard.builders/t/understanding-vesc-the-difference-between-battery-amps-and-motor-amps/15995/253,2017-02-01 09:44:40 UTC
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PXSS, post:254, topic:15995 Wrote:The math may be right

@PXSS

Thank you!
PXSS, post:254, topic:15995 Wrote:He asked why his VESC was having an over current shut off?Your reply: Dont know, increase the power!

@PXSS -- @Ackmaniac laughably admitted he was going to "fix the error" by "increasing the power" to his "old settings"

so obviously: "the error" was caused by the "low" 10/10/10 settings (1.6W full throttle standstill)

but for some reason he won't "increase the power" to 360W full throttle standstill.

even though:
Ackmaniac, post:213, topic:15995, full:true Wrote:1 motor
0.016 resistance
360 watts
10S liion
Even acceleration.

",0,1,http://www.electric-skateboard.builders/t/understanding-vesc-the-difference-between-battery-amps-and-motor-amps/15995/255,2017-02-01 10:20:06 UTC
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