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vedder.se forums • "Peak Efficiency" Control Mode? - Page 4
Page 4 of 12

Re: "Peak Efficiency" Control Mode?

Posted: 04 Sep 2017, 20:39
by Hummie
if your most efficient speed is 25mph and youre starting from 0 but limited in your ability to accelerate you will lull around in inefficiency for a longer time as it takes longer to get to the efficient speed. it seems easier to use your "internal computer" in choosing what amount of acceleration-compromise to make when trying to be as efficient as possible as we have to deal with the necessity of real-world stop-and-go driving.
the most efficient speed might also not be sustainable as it could require too many continuous watts to maintain and then with the increased heat, while still being at a decidedly optimum speed, could end up very inefficient even just in the motor and this would probably be the case with those little motors. As you know if we wanted efficient travel more so than anything else the wind resistance would likely be the biggest factor and we'd be riding at maybe 12mph with a motor that had that as about the top speed. not so practical or fun though.

Re: "Peak Efficiency" Control Mode?

Posted: 04 Sep 2017, 21:00
by devin

Re: "Peak Efficiency" Control Mode?

Posted: 04 Sep 2017, 23:50
by Hummie
seems like it would just be a really low acceleration program as it would always have to keep the applied voltage so close to the back emf and minimal current flow.




http://www.ebikes.ca/tools/simulator.ht ... grade_b=13
comparing two motors with a different voltage, one with 72 volts, other at 36, at the same speed the inefficiency shows up a lot in the bottom right of this link. "performance" shows the huge contrast in temp and efficiency.
why doesn't the esc send the same voltage to each motor regardless of the pack voltage? similar to what you're talking about and if you have control of the effective voltage.

Re: "Peak Efficiency" Control Mode?

Posted: 05 Sep 2017, 00:04
by devin

Re: "Peak Efficiency" Control Mode?

Posted: 05 Sep 2017, 00:13
by Hummie
maybe it was mentioned and the wattage posted is a the high end of the speed spectrum and how much power it would have going from 3 to 5mph when the voltages are so low? if that's what youre saying...always keeping the applied voltage just a hair above the back emf.

Re: "Peak Efficiency" Control Mode?

Posted: 05 Sep 2017, 00:19
by devin

Re: "Peak Efficiency" Control Mode?

Posted: 05 Sep 2017, 00:41
by rew

Re: "Peak Efficiency" Control Mode?

Posted: 05 Sep 2017, 01:03
by devin

Re: "Peak Efficiency" Control Mode?

Posted: 05 Sep 2017, 02:10
by rew
Bullshit

Re: "Peak Efficiency" Control Mode?

Posted: 05 Sep 2017, 02:23
by devin