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by devin
09 Oct 2017, 13:20
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 108
Views: 12655

Re: "Peak Efficiency" Control Mode?

You suggest that while I command 50A of motor current through the throttle, I would accept getting only 0.8A. Well, I don't. I think most people would agree that such a big difference is unacceptable. The general idea is that the more throttle you use, the worse the efficiency becomes. At low speed...
by devin
09 Oct 2017, 00:35
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 108
Views: 12655

Re: "Peak Efficiency" Control Mode?

So, I managed to find a situation, a not so theoretical example, where you fail to reach the "desired efficiency" by getting a much higher efficiency. Now I'm going come up with an example where you fail to reach the desired efficiency by coming short a long ways.... Same motor, but now w...
by devin
05 Oct 2017, 23:54
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 108
Views: 12655

Re: "Peak Efficiency" Control Mode?

@rew Suppose I have a (4) 140kv 0.02ohm hub motors on an electric skateboard with 84mm tires which can do 80A and a 10ah 30C 50V battery. During a lighthearted ride through the park I'm willing to draw up to 300a battery amps for a short time, & on the VESCs I use a 75a battery amp limit and an ...
by devin
03 Oct 2017, 13:05
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 108
Views: 12655

Re: "Peak Efficiency" Control Mode?

Just a quick question. Say I have a 50V motor, currently running at 25V BEMF . Suppose the motor can do 50A, but the torque required is only 5A . The motor has 20mOhm resistance . What is the effective voltage that you propose and what is the efficiency of the motor? (the last example that I read, ...
by devin
02 Oct 2017, 14:16
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 108
Views: 12655

Re: "Peak Efficiency" Control Mode?

please note: if X>0 & 0/X=error then this code won't work and the 9/28/17 12:25 (12 lines) code post will be necessary to use. if X>0 & 0/X=0 then this code should still work. Here I believe is a solution in theory to the potential error caused by zero division and division by zero in the c...
by devin
01 Oct 2017, 18:21
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 108
Views: 12655

Re: "Peak Efficiency" Control Mode?

Efficiency Control in Least Code Steps I previously believed that 8 lines of code was the least possible number of steps for the main portion of efficiency control… but i’ve simplified it down to just 7 lines… K= 90 = Desired Efficiency % Setting L= 500 = Desired Min Watts Available Setting P= 4500...
by devin
01 Oct 2017, 17:43
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 108
Views: 12655

Re: "Peak Efficiency" Control Mode?

Efficiency Control in Least Code Steps I previously believed that 9 lines of code was the least possible number of steps for the main portion of efficiency control… but i’ve simplified it down to just 8 lines… K= 90% = Desired Efficiency % Setting L= 500w = Desired Min Watts Available Setting P= 45...
by devin
01 Oct 2017, 15:34
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 108
Views: 12655

Re: "Peak Efficiency" Control Mode?

Efficiency Control in Least Code Steps I previously believed that 12 lines of code was the least possible number of steps for the main portion of efficiency control… but i’ve simplified it down to just 9 lines… K= 90% = Desired Efficiency % Setting L= 500w = Desired Min Watts Available P= 4500w = D...
by devin
29 Sep 2017, 22:01
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 108
Views: 12655

Re: "Peak Efficiency" Control Mode?

@hummie in the first picture the assumption is that you are at 42% throttle going a steady 15.4mph at 0% grade & this steady speed requires 3.4a battery amps (most likely they’ve factored wind drag at 0% grade 15.4mph). in the second picture the assumption is that you are at 42% throttle going 8...
by devin
29 Sep 2017, 20:40
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 108
Views: 12655

Re: "Peak Efficiency" Control Mode?

looking at the grin tech motor simulator you can see when the load is increased the efficiency drops with every motor on there regardless of the power applied. having the esc programmed to only apply a voltage within a close proximity of the back voltage, which would limit the power, still has the ...

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