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sikeston34m · 03.18.2011, 05:56 PM

Hi Shonen,

Interesting thread idea. I like it.

Wow, I'm not sure which part of your post to talk about first.

First suggestion that comes to mind, if you want to learn ALOT more about outrunners and the principles behind what sets them apart from inrunners, then learn more about how to wind an outrunner.

Browse around this site, there's alot more on the homepage I think:

http://www.powercroco.de/12N10P4225kit_english.html

It was the single most educational thing that I did.

It will teach you alot about how pole count affects all the numbers and why, with both inrunners and outrunners.

Wye versus Delta winding and the differences between the two. For example: Two motors, both with the same number of winding turns, one is Wye and the other is Delta, The wye wind will make 1.73 times the amount of torque as the Delta wind and usually be more efficient doing it. While the kv of the Wye will be 1.73 times less than the Delta. There is a relationship between KV and torque, plus the pole count has a huge impact.

I'm glad you enjoyed the threads Linc and I have created over the years. Thanks for the recognition.

Outrunners do prefer higher timing. This has to do with magnetic harmonics inside the motor and impacts efficiency in a huge way.

Picture it this way:

If the next phase is fired before the magnet is readily positioned over the next pole, then magnetic forces clash. This magnet is fighting the fields produced, but is carried over by the inertia of the spinning motor.

Timing is very important. Higher timing is just favored by the outrunner. It is part of it's nature.

Does the diameter of the endbell affect torque? Absolutely.

To illustrate:

Take the doorknob off and try to open the door by just grabbing the post.

Then install a 12" diameter "doorknob". Will it be easy to turn? You bet.

It's leverage at work.

	(#3)
sikeston34m RC-Monster Brushless Offline Posts: 2,085 Join Date: Sep 2007	03.18.2011, 05:56 PM Hi Shonen, Interesting thread idea. I like it. Wow, I'm not sure which part of your post to talk about first. First suggestion that comes to mind, if you want to learn ALOT more about outrunners and the principles behind what sets them apart from inrunners, then learn more about how to wind an outrunner. Browse around this site, there's alot more on the homepage I think: http://www.powercroco.de/12N10P4225kit_english.html It was the single most educational thing that I did. It will teach you alot about how pole count affects all the numbers and why, with both inrunners and outrunners. Wye versus Delta winding and the differences between the two. For example: Two motors, both with the same number of winding turns, one is Wye and the other is Delta, The wye wind will make 1.73 times the amount of torque as the Delta wind and usually be more efficient doing it. While the kv of the Wye will be 1.73 times less than the Delta. There is a relationship between KV and torque, plus the pole count has a huge impact. I'm glad you enjoyed the threads Linc and I have created over the years. Thanks for the recognition. Outrunners do prefer higher timing. This has to do with magnetic harmonics inside the motor and impacts efficiency in a huge way. Picture it this way: If the next phase is fired before the magnet is readily positioned over the next pole, then magnetic forces clash. This magnet is fighting the fields produced, but is carried over by the inertia of the spinning motor. Timing is very important. Higher timing is just favored by the outrunner. It is part of it's nature. Does the diameter of the endbell affect torque? Absolutely. To illustrate: Take the doorknob off and try to open the door by just grabbing the post. Then install a 12" diameter "doorknob". Will it be easy to turn? You bet. It's leverage at work.