Direct Drive to Diff E Revo Build

[johnrobholmes]

The reason I say Kv probably won't have an effect on tire size is this: we are working within a fixed stator size and copper saturation for any given motor. Whether it produces 1200 watts with amperage or voltage is up to the wind count and matching voltage. For your nail example, if we fix the weight of wire to wind around the nail we shall get different wind counts based on the AWG used. At least for a fixed voltage, the larger AWG wire will have a stronger magnetic feild.

I do know that kt is directly relational to kv, but as kt goes up the amp draw of the motor goes down too- making torque guessing impossible without actually testing.

Not sure where I am going with this really, I think I have convinced myself that wind count might actually change how hard you can gear the motor I do know for a fixed voltage a higher turn motor can be geared a bit higher, but that is based on heat and wattage loading of the motor from my understanding.


I ask this: do you think a 10t on 20v or a 5t on 10v would have any startup differences assuming the cells and ESC can deliver the power? In my time I have messed mostly with gearing and voltage and kept wind count constant.


As for building the 3032, I was gonna fix the stator with 30min epoxy or green locktite. The 3032 isn't something I want to take apart multiple times as the ring bearing is pressed in. My plan was to use 24awg wire most likely, I have a 5lb spool of it. Another thing we could mess with is magnet count and arrangement. Probably want to stick with dLRK or 12 slot /16 pole ABCx4 construction for direct drive.

[sikeston34m]

Originally Posted by johnrobholmes

The reason I say Kv probably won't have an effect on tire size is this: we are working within a fixed stator size and copper saturation for any given motor. Whether it produces 1200 watts with amperage or voltage is up to the wind count and matching voltage. For your nail example, if we fix the weight of wire to wind around the nail we shall get different wind counts based on the AWG used. At least for a fixed voltage, the larger AWG wire will have a stronger magnetic feild.

I do know that kt is directly relational to kv, but as kt goes up the amp draw of the motor goes down too- making torque guessing impossible without actually testing.

Not sure where I am going with this really, I think I have convinced myself that wind count might actually change how hard you can gear the motor I do know for a fixed voltage a higher turn motor can be geared a bit higher, but that is based on heat and wattage loading of the motor from my understanding.


I ask this: do you think a 10t on 20v or a 5t on 10v would have any startup differences assuming the cells and ESC can deliver the power? In my time I have messed mostly with gearing and voltage and kept wind count constant.


As for building the 3032, I was gonna fix the stator with 30min epoxy or green locktite. The 3032 isn't something I want to take apart multiple times as the ring bearing is pressed in. My plan was to use 24awg wire most likely, I have a 5lb spool of it. Another thing we could mess with is magnet count and arrangement. Probably want to stick with dLRK or 12 slot /16 pole ABCx4 construction for direct drive.

Yes, the larger AWG wire will have a stronger magnetic field because of what? Total Power output as far as watts goes, depends alot on the total resistence of the winding. What affects this? Total wire size used,(multiple strands even), and length of the run.

If you try a Wye Termination winding, just remember total run length is about twice that of the Delta. The thing that intrigues me about it is, it is pulling on 8 magnets at a time instead of 4. This gives a torque bonus at the expense of kv. That's why I was suggesting using fewer turns on each pole.

"I ask this: do you think a 10t on 20v or a 5t on 10v would have any startup differences assuming the cells and ESC can deliver the power?"

I think idealy they would start the same if the strand count was such to make the resistence equal. The 5T would make more heat and draw twice the amps. The 10t would run cooler and be more efficient.

I looked for the Green Loctite at a local "O Reilly" Auto parts store. They had the Permatex brand. Come to find out, Permatex Green isn't exactly the same as the Loctite Green, because it's medium strength. Where can I find the Loctite Green?

I do believe there is a magnet/winding configuration that will work better than these "out of the box" Delta Outrunners. I hope you find it.

[sikeston34m]

I just did a run with 6S1P A123. I forgot to change the low voltage cutout though. With the LVC set at 3.0, the run lasted 11 minutes.

Performance is good. Temps are well in check. The Batteries got up to 120, but the ESC and the Motor remained cool. ESC at 97, Motor at 95 degrees.

A123 with only 1P, the voltage seems to sag ALOT under a load.

I'm gonna try 5S1P 4000mah Lipo next.