Quote:
Originally Posted by johnrobholmes
That is correct, a delta terminated motor needs 1.72x the winds to match a Wye terminated motors KV. The D termination has less resistance since there are two parallel current paths in any phase.
I think you are getting a bit ahead of yourself on the torque though. While yes you will have 1.72x the torque with a Wye termination (per amp), the amp draw will go down. If you don't change your voltage the torque (and wattage) will actually be lower since torque and amp draw are directly proportional. If you volt back up to the same motor speed your torque will again be the same, but at a lower amp draw since the kt is of higher value with a lower kv motor. A 1200 watt motor is a 1200 watt motor, and the torque curve is almost perfectly linear for a permanent magnet motor no matter what the wind or termination.
The increase in EFM feedback should be correct though, plus higher voltage motors give better feedback anyway. Although the motor doesn't have higher torque, the ESC should see the motor better in effect making more efficient use of the torque.
It really wouldn't be hard to take a motor apart and just change the termination.
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I feel like there must be a good torque bonus if only based on the fact that it's pulling on 8 magnets with each phase instead of 4.
Yes motor timing will be more accurate especially at low speeds.
I've thought about taking one apart and changing the termination, but let's look at an example.
The 4120/14 that I'm running is 660kv. By using the same 14 turn winding and changing the termination, I'm cutting the kv to 384kv. Even though torque would be increased by 1.72 times, the 384 kv isn't enough to do the trick. Unless I wanna go HV. Hmmmmmmm.........there's an idea!
The is where more strands and less turns comes in.
I plan on consulting with the winding guys at AXI about this. Let's see what they say.
