liveforphysics
100 TW
neptronix said:Sorry guys. If the motor is anything like the crystalyte HT, it will have to shed about 1000w worth of power at the most difficult parts. It will also drop out of it's efficiency range at those parts and dip into the 50% - 60% eff. range if it's anything like the HT, and i do believe it will be like the HT, going off it's diameter.
No. It's nothing like the clyte HT. Nothing remotely similar.
neptronix said:The lower efficiency of taxing one motor hard means i have to carry even more batteries. I am already looking at 30AH of 20s lipo at an absolute bare minimum. Running two motors simultaneously means i should have double the torque and thus dropping out of the efficiency range won't be so much of an issue.
THIS IS NOT HOW MOTORS WORK. You will never match the efficiency with two motors that you would have with a single motor and twice the cooling. Two motors just means additional hysterisis loss, eddy current loss, friction and weight.
Unless a single motor is saturating its stator (which is NOT a concern here), it's ALWAYS unconditionally going to be most efficient to get the power you need from a single motor with twice the cooling than a pair of motors with half the cooling. Absolutely always, zero exceptions, 100% every single time.
When you go from 10amps to 20amps (and we're talking phase amps, not battery amps here), it EXACTLY makes 2x the torque, in a perfect linear relationship, every single time (as long as you're not in saturation, which again does not apply for this).
If you require 40ft-lbs of torque to climb, if you get 40ft-lbs from 1 motor, or 20ft-lbs apiece from 2 of that motor, the two motor setup will always be lower efficiency than the single motor doing the job. (once again, assuming you're not magnetically saturating the stator, which isn't a concern for our application.)
Every motor requires a certain amount of waste energy just to make it spin. Increasing torque on a motor that you all ready have spinning does not require any additional waste to make additional torque, aside from the copper losses it endures from the increased current, which would be exactly the same copper losses you would get if you were powering 20 motors or a single motor.
If you can shed the heat, and you're not saturating, it is ALWAYS UNIVERSALLY EVERYTIME most efficient to do it with 1 motor than 2.
dogman said:Rewound pie. Or slower winding pie if it can be found. Then volt up.
The wind of the motor has no effect on it's continuous torque my friend. If the slot is stuffed well with copper as it comes, then it's setup the best it's going to be setup.