Search found 29 matches

by scienceworks
25 Jun 2016, 17:15
Forum: General
Topic: VESC Efficiency Computation ?
Replies: 7
Views: 1809

Re: VESC Efficiency Computation ?

the vesc could certainly calculate the resistive copper losses because the current and resistences are known. but the rest will be depending on the motor and propably cant be measured easily.
by scienceworks
13 Jun 2016, 17:08
Forum: Custom Applications
Topic: Old pick and place machine
Replies: 5
Views: 2027

Re: Old pick and place machine

youve seen that project already?
viewtopic.php?f=6&t=221

my thoughts, its would be a waste to make a 3d printer out of that machine, why dont you rebuild it to a modern pick n place again?
by scienceworks
13 Jun 2016, 12:50
Forum: General
Topic: ebike thumb or twist throttle and break servo ?
Replies: 18
Views: 4598

Re: ebike thumb or twist throttle and break servo ?

you could design the mechanical break like the ones used in trains, where the servo is used to compress a spring that applies the break unless the servo acts on it. if you go for a moderate amount of breaking force when the servo is off, you also dont fly off the board when something goes wrong.
by scienceworks
09 Jun 2016, 19:24
Forum: General
Topic: ebike thumb or twist throttle and break servo ?
Replies: 18
Views: 4598

Re: ebike thumb or twist throttle and break servo ?

you want to use a servo to control the mechanical breaks? that sounds dangerous! what if the servo goes funky and locks up the breaks? i played around with using the breaklever as an analog signal on my bike with v breaks. i adjusted the breaks so that there are a few milimeters of travel before the...
by scienceworks
05 Jun 2016, 21:33
Forum: General
Topic: 14S VESC ?
Replies: 97
Views: 20515

Re: 14S VESC ?

but then you will have shitty acceleration and maybe not even enough power to get to topspeed.

im not into skateboards, but i know that most use motors lower than 200kv AND a reduction beltdrive.
by scienceworks
05 Jun 2016, 20:18
Forum: General
Topic: 14S VESC ?
Replies: 97
Views: 20515

Re: 14S VESC ?

for the same motor the torque and therefore the acceleration will be the same, more voltage will give you higher topspeed. in theory 12s should cause less losses in the cables and battery, but if you have short cables and good batteries it shouldnt really be that big of an issue. have you looked int...
by scienceworks
05 Jun 2016, 18:51
Forum: General
Topic: 14S VESC ?
Replies: 97
Views: 20515

Re: 14S VESC ?

i think you still dont know the difference between motor current and battery current. it has all been explained here many times, please try to read it again.
by scienceworks
05 Jun 2016, 08:33
Forum: General
Topic: 14S VESC ?
Replies: 97
Views: 20515

Re: 14S VESC ?

Im doing 2 hub motors up steep stuff sitting on full throttle I'm asking for as many amps as possible but not getting more. Set to 60 on both escs. Dare I ask for 80?! They don't get even warm but can get motors to overheat maybe not 80 right away, try 65 on one vesc and leave the other at 60, then...
by scienceworks
04 Jun 2016, 23:31
Forum: General
Topic: 14S VESC ?
Replies: 97
Views: 20515

Re: 14S VESC ?

if you dont reach the current limit but are getting to the rpm limit it means you arent pulling enough mechanical power out of your setup.

swithcing to 12s will only get you more top speed, if you want more power you should go for a different gearing.
by scienceworks
03 Jun 2016, 11:39
Forum: General
Topic: 14S VESC ?
Replies: 97
Views: 20515

Re: 14S VESC ?

So when you say you configured your motor for 60A, and you measure only 25A battery current (*) that means that your motor is not running fast enough. That could mean that at 60A it doesn't get enough speed to come near the maximum RPM for that battery, or it means that your battery has too low vol...

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