What happens to the Kv when the timing is changed? What happens to the Rm when the timing is changed? What happens to the current when the timing is changed? What happens to the RPM when the timing is changed? The temperature through the 5-hour testing period ranged from 84F to 90F, with the barometric pressure about The testing was done just inside of my garage at the garage door opening facing north, while the rear entry door of the garage was left open for some airflow.
The battery for the prop testing was my 6S1P M1 pack from www. Io has always been considered a constant, but is it? This was NOT an unexpected result, as it also does with brushed motors when the timing is advanced! Conclusion, Io cannot be given for a brushless outrunner as part of the "motor" data as it is dependent on the ESC design and manufacturing and how the end user sets the timing. Please note that the real system power out is a very "iffy" calculation without a dyno.
The number indicated here for system Power Out Pout is based on my best guess using my spreadsheet data and some prop data. Please don't assume that power system is as efficient as it appears here, but since the same type of calculation was used to figure the system Pout, the relative numbers will remain pretty much the same APC 10x7E 1-deg Average: Relative Kv is changing with the timing.
Therefore, the Kv number given by a motor manufacture is a relative number and once again will be determined by the specific ESC and timing chosen by the end user. What happens to the Rm apparent motor resistance? Unlike a brushed motor, the brushless motor will not run without the ESC to do the commutation. Thus, the ESC is actually a part of the motor and any Rm number given by a motor manufacture is pretty useless as it is only one part of the actual brushless motor system.
While the motor Kv can be derived using the drill press method, once the ESC is factored into the motor equation, everything changes. Using the no load data from above, here are the quick and dirty relative Kv calculations. Note that these numbers are all slightly higher than the real Kv, but close enough for a comparison.
When this is done, I'm not showing it here, but I'll be happy to provide my spreadsheet to anyone interested it can be seen that the relative Rme goes down as the amps go up within any timing setting and that the relative Rme also goes down as the timing is advanced. Since the simple and most used way to predicted brushed motor performance is based on the Io, Kv and Rm being constant, it is easy to see why those constants fail when predicting outrunner brushless performance.
Here is why I believe in the performance predictions of Drive Calculator www. The following shows my measured data compared to the information output by Drive Calculator. Remember that Drive Calculator has to take into account all of the changing "constants" of the motor and ESC, as well as what is going on with the power supply, in this instance a 6S1P M1 pack and manipulate the prop data and arrive at a prediction.
You be the judge. The numbers are presented in this order; volts in, amps, RPM and Watts In Low timing should provide the power and efficiency I want when I use this motor and help keep all parts of the power system quite "happy. Total 6, Today 0 Yesterday 1. You came out the same day as I called. Super fast response. I'd give more than 5 stars if I could. The well pump had died and the company replaced the pump and wire.
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