What's the deal with EVEN turn/wind Brushless motors?
04-12-2010, 01:50 PM
#1
What's the deal with EVEN turn/wind Brushless motors?
Why are they more uncommon, some companies don't even make them.
Are they harder to make correctly or more expensive to make?
Is there some reason why it is better to run a .5t? for example a 4.5t instead of a 5.0t
Are they harder to make correctly or more expensive to make?
Is there some reason why it is better to run a .5t? for example a 4.5t instead of a 5.0t
04-12-2010, 02:20 PM
#2
It's the way the stators are wound.
http://www.mmsonline.com/articles/wy...in-perspective
http://www.roarracing.com/downloads/..._Rule_Book.pdf [pg 49]
Roar Approved "spec" motors are Wye wound, which means the windings are inter connected to a common point, which is usually on the pinion side of the stator. Since the connection to the speed control is at the other end, you end up with an extra 0.5T building the motor.
The "even" turn motors you asked about are Delta configuration windings, but would only be legal in mod.
Since a Wye motor can run just fine sensorless as well, there's not a whole lot of incentive for manufacturers to make both winding configurations.
http://www.mmsonline.com/articles/wy...in-perspective
http://www.roarracing.com/downloads/..._Rule_Book.pdf [pg 49]
Roar Approved "spec" motors are Wye wound, which means the windings are inter connected to a common point, which is usually on the pinion side of the stator. Since the connection to the speed control is at the other end, you end up with an extra 0.5T building the motor.
The "even" turn motors you asked about are Delta configuration windings, but would only be legal in mod.
Since a Wye motor can run just fine sensorless as well, there's not a whole lot of incentive for manufacturers to make both winding configurations.
04-12-2010, 02:20 PM
#3
EA
04-13-2010, 11:24 AM
#4
Wye is a bit different than you think.....
Brushed motors are wound delta. Delta is basically one big piece of wire from segment to segment that terminates at the common point at the end.
Wye motors are basically wound one segment at a time, so there is essentially 3 seperate pieces of wire (yes I am aware each segment can have multiple strands of wire)....with one termination at the top and one at the bottom. Was never used on brush motors, though big jim did make one for giggles....it was terrible.
Bob Novak flat out told me they wound their stuff Wye, because at the time it made the power in their mind more comparable to brushed......he said delta was much more powerful.
So, the reason you have a odd number like 3.5, 10.5 etc is cause the wire starts at the top, but never returns.....so the last wind is only half.
Later EddieO
Brushed motors are wound delta. Delta is basically one big piece of wire from segment to segment that terminates at the common point at the end.
Wye motors are basically wound one segment at a time, so there is essentially 3 seperate pieces of wire (yes I am aware each segment can have multiple strands of wire)....with one termination at the top and one at the bottom. Was never used on brush motors, though big jim did make one for giggles....it was terrible.
Bob Novak flat out told me they wound their stuff Wye, because at the time it made the power in their mind more comparable to brushed......he said delta was much more powerful.
So, the reason you have a odd number like 3.5, 10.5 etc is cause the wire starts at the top, but never returns.....so the last wind is only half.
Later EddieO
04-16-2010, 10:49 PM
#6
brood brushless some day......working on it. Had plenty of time to think about it!
Later EddieO
Later EddieO
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