Wiring question?
03-06-2012, 03:19 PM
#1
Wiring question?
I'm wiring up my new HW 120a in my SCTE and I just noticed that on all my wiring jobs in the past my motor wires were all the same length. Does it matter if they are not? With the angle my esc is now sitting it would look cleaner if they were different lengths.
03-06-2012, 04:54 PM
#7
Thanks, all wired up and ready for Saturday.
03-07-2012, 08:04 PM
#8
i see a wires both 12 gauge, 1 at 5 inches long and 1 thats 2 inches long. I put 100 amps in to both. test with a electronic gauge and the longer one, has less amps and volts.. what does this mean..?? I have no clue why...lol so I make them the same .. and your esc will be a happy esc and not in the mail getting replaced...JMO
03-07-2012, 08:10 PM
#9
The wire we use in R/C does not have that much resistance , especially 3 inches .
Be interesting to hear how you measured the amps as you would have to have a meter in series with each wire under a load .
How many less amps and volts did you measure ?
Be interesting to hear how you measured the amps as you would have to have a meter in series with each wire under a load .
How many less amps and volts did you measure ?
03-07-2012, 08:22 PM
#10
i see a wires both 12 gauge, 1 at 5 inches long and 1 thats 2 inches long. I put 100 amps in to both. test with a electronic gauge and the longer one, has less amps and volts.. what does this mean..?? I have no clue why...lol so I make them the same .. and your esc will be a happy esc and not in the mail getting replaced...JMO
What's the voltage differential between the 2" and the 5" lengths?
03-07-2012, 09:34 PM
#11
Isn’t the possible issue not minute resistance differences, but rather any possible timing difference in determining and/or firing the phases?
Lets take a stab at comparing the possible timing differences. Assume a really fast motor, say 100,000 RPM, not many rotors will stay together at any faster speed if that. Three phases per rev gets us to 300,000 phases per minute, or 5,000 per second. 0.0002 seconds per phase.
Electricity generally travels at something approaching the speed of light. Lets be conservative, say 95%, or about 176,000 miles per second. In 0.0002 seconds that’s a little over 35 miles. I’m not going to finish the math, even a 6 inch round trip is fairly small compared to 35 miles.
If I’m missing something please advise, cause mine, and many others, aren’t always the same length.
Lets take a stab at comparing the possible timing differences. Assume a really fast motor, say 100,000 RPM, not many rotors will stay together at any faster speed if that. Three phases per rev gets us to 300,000 phases per minute, or 5,000 per second. 0.0002 seconds per phase.
Electricity generally travels at something approaching the speed of light. Lets be conservative, say 95%, or about 176,000 miles per second. In 0.0002 seconds that’s a little over 35 miles. I’m not going to finish the math, even a 6 inch round trip is fairly small compared to 35 miles.
If I’m missing something please advise, cause mine, and many others, aren’t always the same length.
03-07-2012, 10:46 PM
#12
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