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by devin
29 May 2017, 21:09
Forum: General
Topic: code to change the motor amp limit
Replies: 138
Views: 69485

Re: code to change the motor amp limit

Your pencil has finite thickness. Your compass is not perfect, you have to visually set it to the right width. My calculator can EASILY outperform your not 100% accurate drawings Yes but use an infinitely fine pencil & perfect compass & use the same geometric steps to make the same drawing ...
by devin
29 May 2017, 14:57
Forum: General
Topic: code to change the motor amp limit
Replies: 138
Views: 69485

Re: code to change the motor amp limit

Look you can draw circles and squares all day, but I don't understand what you're getting at . @rew If one wants to represent the square root of 3 with 100% accuracy in decimal form this takes infinite paper volume (more paper mass than the entire solar system including the sun and jupiter... in fa...
by devin
28 May 2017, 14:28
Forum: General
Topic: code to change the motor amp limit
Replies: 138
Views: 69485

Re: code to change the motor amp limit

With 1/3rd the copper, you cannot get "identical performance". Because I think you can substitute thinner wire (but same number of turns) at no damage to the KV, it is easy to create a configuration with the same KV, but less performance. Thinner wire, or "less copper" as you sa...
by devin
28 May 2017, 12:33
Forum: General
Topic: code to change the motor amp limit
Replies: 138
Views: 69485

Re: code to change the motor amp limit

OK. Now I get it. Suppose I have two Y wound motors. One I rewire with thicker wire to make the end-to-end resistance 3x smaller. The second I rewire to delta. You will not be able to measure the difference between the two changed motors. Terminal resistance and KV will be identical. A useful insig...
by devin
27 May 2017, 10:58
Forum: General
Topic: code to change the motor amp limit
Replies: 138
Views: 69485

Re: code to change the motor amp limit

I guess i'm saying KV is inversely proportional to the number of turns. You're saying that resistance is related to the square of the number of turns if you keep the copper volume constant. True. So now KV becomes inversely proportional to the resistance. Call the inverse of the resistance conducta...
by devin
27 May 2017, 01:30
Forum: General
Topic: code to change the motor amp limit
Replies: 138
Views: 69485

Re: code to change the motor amp limit

Re-Winding the 100 KV Wye to 150 KV Wye Keeping Same Copper Volume : -Wye -150kv = 100kv original wye x 1.5 [ kv change factor 1.5 ] <- more kv -19.24 turns = 28.86 original turns / 1.5 <- less turns -2.59807 cross section = 1.73205 original cross section x 1.5 [keeps copper volume constant after t...
by devin
25 May 2017, 17:48
Forum: General
Topic: code to change the motor amp limit
Replies: 138
Views: 69485

Re: code to change the motor amp limit

Re-Winding the 57.735 KV Wye to 100 KV Wye Keeping Same Copper Volume : -Wye -100kv = 57.735kv original wye x sqrt(3) [ kv change factor sqrt(3) ] <- more kv -28.86 turns = 50 original turns / sqrt(3) <- less turns -1.73205 cross section = 1 x sqrt(3) [keeps copper volume constant after turns reduc...
by devin
25 May 2017, 16:34
Forum: General
Topic: code to change the motor amp limit
Replies: 138
Views: 69485

Re: code to change the motor amp limit

Motor: -Delta -100kv -50 turns -1 cross section -1 copper volume -0.08300 ohm resistance lead-to-lead (0.0415 ohm VESC detection) -12.04819 siemens conductance = 1/0.08300 ohm KV Formula For Motor: 100kv = A x 1.73205[Delta] x 50 KV = 100 A = X = Constant(motor) B = 1.73205 = C(termination) <- Must...
by devin
25 May 2017, 15:29
Forum: General
Topic: code to change the motor amp limit
Replies: 138
Views: 69485

Re: code to change the motor amp limit

@Rew-- lets compare your formula with my assertion that kv changes are proportional to the square root of conductance changes using only this information: KV = Constant(motor) * C(termination) * turns. C(termination) is 1 for Y or sqrt(3) for delta wiring. ^ @rew -- this formula appears to confirm ...
by devin
25 May 2017, 14:13
Forum: General
Topic: code to change the motor amp limit
Replies: 138
Views: 69485

Re: code to change the motor amp limit

...Inductance decides kv... @Hummie the magnetic permeability & ferromagnetic properties of the stator will affect the strength of the stator magnetic field ... & changes to this would in turn have an effect on both measurements of kv and measurements of winding inductance . the magnetic pe...

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