Search found 225 matches

by devin
29 Sep 2017, 22:01
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 108
Views: 8296

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: 8296

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 ...
by devin
28 Sep 2017, 19:25
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 108
Views: 8296

Re: "Peak Efficiency" Control Mode?

Efficiency Control in Least Code Steps I've simplified the efficiency control code down to what I believe is in theory the least possible number of code execution steps: Assuming: K= 90% = Desired Efficiency % Setting L= 500w = Desired Min Watts Available P= 4500w = Desired Max Watts Available M= 10...
by devin
28 Sep 2017, 15:11
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 108
Views: 8296

Re: "Peak Efficiency" Control Mode?

http://tppsf.com/40mph-hub-4.jpg I updated the code to account for the fact that max duty cycle is 95% and max motor amps is 120a... by my calculations a single hub motor+vesc could conceivably propel a human to 40mph at more than 90% conversion efficiency with the following assumptions... Efficien...
by devin
27 Sep 2017, 15:36
Forum: General
Topic: code to change the motor amp limit
Replies: 138
Views: 27630

Re: code to change the motor amp limit

I rode many miles at 200 motor amps and am asking why it works @hummie... i think this graph solves the riddle... With a 200 motor amp limit setting & 48 battery amps limit setting, 0.0830ohm winding (0.0415ohm FOC detection * 2) & 35v pack, the motor amp limit would have been automatically...
by devin
26 Sep 2017, 15:31
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 108
Views: 8296

Re: "Peak Efficiency" Control Mode?

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by devin
26 Sep 2017, 13:34
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 108
Views: 8296

Re: "Peak Efficiency" Control Mode?

here's a graph of the output of the efficiency control algorithm assuming 90% desired conversion efficiency, 500 min available watts, 2500 max available watts, 50v, 0.05ohm winding, 84mm tire diameter, 90kv, 1:1 gear ratio (hub motor), 100% throttle, 95% max duty cycle & 120a max motor amps: htt...
by devin
23 Sep 2017, 09:21
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 108
Views: 8296

Re: "Peak Efficiency" Control Mode?

Efficiency Control Via Watt Control Via Duty Cycle Control Without Motor KV Knowledge? Where: K= 90% = Desired Electrical to Mechanical Conversion Efficiency Setting L= 500w = Desired Minimum Available Wattage Setting P= 2000w = Desired Maximum Available Wattage Setting & P>=L G= 50V = Pack Vol...
by devin
21 Sep 2017, 15:32
Forum: General
Topic: Watt Control Via Duty Cycle Control?
Replies: 14
Views: 1031

Re: Watt Control Via Duty Cycle Control?

I guess you won't stay long at 4.2 Volts, and not at 3.2 Volts either. I may even be cool to warn the user by decreasing the available power when the battery goes low. Anyway, if this is unacceptable for you.. With an open source code, and so much CPU ressources, nearly everything is possible. Yes ...
by devin
19 Sep 2017, 12:41
Forum: General
Topic: Watt Control Via Duty Cycle Control?
Replies: 14
Views: 1031

Re: Watt Control Via Duty Cycle Control?

Watt control from the battery is already implemented , since you can configure a limitting max battery current , and the battery voltage should be very stable. If you give enough throttle, the duty cycle and motor current will be determined by the max battery current, ie watt-control. It might be i...

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