Great stuff.
I know the 1409 and 1410 have longer cans than the 1406, but, within the 1406 series, do the kigher KV 1406 motors have less mass since the motors are optimised by rotor/stator length? So someone with a pan car, shaving micrograms, would get the 1406-7700 and gear it low, saving some weight over the 1402-4600 and gearing it high?
But, if weight isn't a primary factor, if someone wants maximum power draw, they get the SCT motor (websight says 1410) and gear it tall. When they run out of teeth, but not out of track, they get a faster model, so long as temps stay healthy.
So with the NUE motor series, each motor is really a different motor since they have rotors/stators of differing lengths?
Quote:
Originally Posted by Pdelcast
There are other things that come into play as well, such as rotor diameter (which increases torque by the square of the diameter) stator length (linear torque increase with stator length) air gap (decreased torque by the cube of the air gap) etc...
What we've tried to do is make the most efficient possible motor -- while making it as efficient as possible over the entire usable range.
This means increasing the torque per turn as much as possible, while minimizing no-load current. The 1406 motors are all 1-turn motors, with small tweaks in other areas to change the Kv (mostly by changing the stator length...)
So the motor that makes the most power is the 1409 SCT motor, with it's very long stator and rotor. As the Kv of these motors goes up, the maximum continuous power goes down... but high Kv motors are usually used in fast, lightweight cars, so the power requirements are lower.
Burst power from these motors is incredible... the 50% efficiency point (the point where more input power won't generate any more output power, just more heat -- those of you who run ROAR motors know what I'm talking about) is so far down the graph that we can't hit it without destroying the motors. So they can be used in high burst applications (like drag racing) just as well as oval, dirt track, etc...
These motors use .2mm powder coated laminations (expensive -- but much lower no load current -- almost all other motors on the market use less expensive .35mm laminations) oversized NMB bearings, high temperature magnets (N38UH -- good to 180C temperatures) 180C rated windings, 6061-T6 case components, etc...
These motors were designed to be as bulletproof as possible, and as efficient as possible.
|