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by devin
25 May 2017, 05:45
Forum: General
Topic: code to change the motor amp limit
Replies: 138
Views: 53726

Re: code to change the motor amp limit

I was following you until "3". If you think of the KV as: "how big a voltage do I get when I turn the motor mechanically?", (you'd be more likely to think of volts per RPM, than RPM/V, but it's the same thing)... Then you will see that the KV is independent of the wire thickness...
by devin
24 May 2017, 11:04
Forum: General
Topic: code to change the motor amp limit
Replies: 138
Views: 53726

Re: code to change the motor amp limit

devin wrote: ^ If I apply 1 effective volt to the first example, that's 1 amp and 1 watt at standstill Rewinding with the 0.01 cross section wire, that's 0.01 amp and .01 watt at standstill No... When you apply 0.01amp to the first motor, that requires 0.01V at standstill. This produces the same to...
by devin
23 May 2017, 21:18
Forum: General
Topic: code to change the motor amp limit
Replies: 138
Views: 53726

Re: code to change the motor amp limit

1) wye 100kv 1 ohm 1 conductance 100turns 100kv 1 crossection 1 copper volume -> rewinding with other wire. 100 . ohm 0.01 conductance 100 turns 100kv [<--- is this kv really possible if the motors are identical except for the windings?] 0.01 crossection 0.01 copper volume [/code] I rewind with 1/1...
by devin
23 May 2017, 08:40
Forum: General
Topic: code to change the motor amp limit
Replies: 138
Views: 53726

Re: code to change the motor amp limitt

IMHO, the conductance of the windings does not influence KV. It is the number of turns that influences the KV. @rew-- i think we agree on the answer for cases 1 & 2 below-- what do you think the answer is for case #3? 1) wye 100kv 1 ohm 1 conductance 100turns 100kv 1 crossection 1 copper volume...
by devin
22 May 2017, 16:53
Forum: General
Topic: code to change the motor amp limit
Replies: 138
Views: 53726

Re: code to change the motor amp limit

Following this logic it would seem when the rotor and stator are identical, when altering a winding an increase factor in KV is proportional to the square root of the increase factor of conductance (as illustrated below): 1) Winding Conductance Increase Factor: x 1 KV Increase Factor: x 1 2) Winding...
by devin
20 May 2017, 21:26
Forum: General
Topic: code to change the motor amp limit
Replies: 138
Views: 53726

Re: code to change the motor amp limit

in the change from wye termination to delta termination we see that when conductance increases to 3 times the original value, kv increases to 1.73205 [sqrt(3)] times the original value: 1) wye to delta retermination: original conductance x 3 original kv x sqrt(3) [1.73205] 2) wye to wye rewinding wi...
by devin
20 May 2017, 15:56
Forum: General
Topic: code to change the motor amp limit
Replies: 138
Views: 53726

Re: code to change the motor amp limit

I was following you until "3". 1) If you reterminate wye to delta, you get 3 times the conductance and 1.73205 [sqrt(3)] times the kv 2) Wye to wye -- If you keep the same copper volume, but divide the number of turns by 1.73205, you also apparently get 3 times the conductance and 1.73205...
by devin
20 May 2017, 12:50
Forum: General
Topic: code to change the motor amp limit
Replies: 138
Views: 53726

Re: code to change the motor amp limit

1. We start with a wye winding wye 100 turns 100 length 1 crossection 1 conductance 1 resistance 1 copper volume 100kv 2. Now we simply reterminate to delta retermination to delta 100 turns 100 length 1 crossection 3 conductance 1/3 resistance 1 copper volume 173.205kv <--- what exactly caused 100kv...
by devin
19 May 2017, 19:51
Forum: General
Topic: code to change the motor amp limit
Replies: 138
Views: 53726

Re: code to change the motor amp limit

in retermination of wye to delta, resistance drops to 1/3rd of original, while kv increases to 1xsqrt(3) of original when resistance drops to 1/3rd of original, "conductance" increases to 3 times the original when conductance increases to 3 times the original, kv increases by sqrt(3) times...
by devin
19 May 2017, 18:32
Forum: General
Topic: code to change the motor amp limit
Replies: 138
Views: 53726

Re: code to change the motor amp limit

Same KV means same torque per amp. then it would seem if you start with wye 100kv reterminate to delta 173.205kv (33.3333% original resistance) or rewind wye with shorter thicker wires (same copper volume) to 173.205kv (resistance and length and turns divided by square root of 3 because shorter wir...

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