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by devin
14 Oct 2017, 09:38
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 110
Views: 19150

Re: "Peak Efficiency" Control Mode?

Throttle Response Update: In theory this update to the code improves the dynamic throttle response produced by the algorithm at times when full throttle would result in the motor amp limit setting or duty cycle limit setting being reached. Where: M= 100 = Throttle % Setting K= 90 = Desired Efficienc...
by devin
13 Oct 2017, 12:22
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 110
Views: 19150

Re: "Peak Efficiency" Control Mode?

So your algorithm gets to propose a throttle setting to amp conversion depending on more than just the throttle, right? Well if your algorithm limits "max throttle" to < 5A at < 5km/h, then you will lose customers fast. Acceleration on my bike is unacceptably slow with 20A motor current. ...
by devin
09 Oct 2017, 13:20
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 110
Views: 19150

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: 110
Views: 19150

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: 110
Views: 19150

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: 110
Views: 19150

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: 110
Views: 19150

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: 110
Views: 19150

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: 110
Views: 19150

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: 110
Views: 19150

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...

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