dualsky 5015 24N28P rewind
Original post: http://bbs.5imx.com/bbs/viewthread.p...=16#pid8022415
May you use google to translate

What is the lamination thickness in this motor?

Greg

Originally Posted by gkamysz

What is the lamination thickness in this motor?

Greg

I did post the very details about the motor in the chinese forum as the link above. I'll do a google here:

DUALSKY pairs of days XM5015TE outer rotor brushless motor, the stator dimensions d = 43.5, h = 15mm. Rotor outer diameter of 49mm. Magnet plus rotor hoops thickness of 2.5mm, and roughly the air gap (49-43.5-2.5-2.5) / 2 = 0.25mm. Silicon steel thickness of 0.2mm. Double-bearing system, the front bearing 6 * 12 * 4, the rear bearing 6 * 15 * 5.

The original motor winding way: 24N28P AabBCcaABbcCAabBCcaABbcC, of ​​delta connection. 12T (per alveolar clearance), 12 line of 0.25mm (30AWG) an.
Copper cross-sectional area within each alveolar clearance: 12x12x0.0509 = 7.3296mm ^ 2 (by trapezoidal rough estimate of the alveolar gap size: (2.5 +3) x4.4 / 2 = 12.1mm ^ 2. Tank full rate of about 7.3296 / 12.1 = 60.6%)


Re-winding way: 24N28P AbCaBcAbCaBc-, of delta connection. 11T (each alveolar clearance). Per alveolar clearance of a single 1.02mm line (18AWG) copper cross-sectional area: 11X1X0.823 = 9.053mm ^ 2, than the primary coil tank full rate increase 23.5 percent.


Try to use 0.64mm, 0.9mm, and are feeling more difficult around, around the full and easy short-circuit. Final decision on the 1.0mm line, good results, 5 +4 +2, a total of 11 laps (in fact, if you want to force around go around 12 laps, but have very tight pressure, the absence of the use of additional insulation paper, or 11T to avoid the line and the stator short circuit). Single-the alveolar single direction winding and half the alveolar winding method, to keep each alveolus around the coil is fully consistent with, the more important to be able to ensure that can be around into the 11 laps (in the opposite direction may be more difficult around), while around play an alveolar multimeter test wireless and stator short circuit. The wiring is a little trouble, be careful to see. Take a good appearance, or can, not before then chaos.
In addition to change the bearing, the former bearing no sign that looks like a rustle.
In addition to bearing flattered, the stator (silicon steel sheet thickness), the rotor (balance), air gap, the unique design of the stator holder (good ventilation), and fixed rotor design and paddle clip design very much in line with my personal ideal, the feeling is very value of a motor. In fact the original winding slot full rate. 1.0mm line, if the whole alveolar winding, it is estimated that up to around 13 laps (5 +1) +1 + (1 +5), but it will be very difficult, in particular, may easily lead to short circuit, the use of additional insulation paper, may lead to can not be around in so many lines. The use of the half alveolar winding, can be wound up into the lap 5 +4 +2 +1, and similarly, the last lap will be more difficult.
Taking into account the silicon steel sheet of 0.2mm and 0.25mm below the air-gap, high theoretical winding factor 24N28P interval alveolar LRK winding, and the motor good ventilation and heat dissipation performance, this motor performance is not bad the.

Based on the original motor data:
Resistance (mOhm): 59
Cruise power (W) [8 mins]: 428.92
Maximum instantaneous current (A) [15s]: 35.13
Maximum power (W) [15s]: 779.85

Estimates of the motor corresponding data in the winding: Resistance: 59 X (7.330 / 9.035) x (11/12) = 44 mOhm
22.2V No-load current: 1.7A, the best efficiency of current = (22.2 X-1.7 / 0.044) ^ 0.5 = 29A
11.1V No-load current: 1.0A, the best efficiency of current = 16A
Cruise power: 428.92 X (1 +23.5%) X (0.966/0.933) = 550W
Maximum instantaneous current: 35.13 X-(1 at +23.5%) = 43A
Maximum Power: 1000W

It is just like a small sized Hacker Q80. I'll say it is really a good deal.

Yes, I did read that, but was not quite sure how to understand it. Thank you.

These must he fairly new. Nobody is listing them yet.

Greg

Originally Posted by gkamysz

Yes, I did read that, but was not quite sure how to understand it. Thank you.

These must he fairly new. Nobody is listing them yet.

Greg

out for some time, but should be new. you can check dualsky official website. they have english page/.

I've tried the google translation, it is pretty much incomprehensible to me.

google translation - http://tinyurl.com/83xt27t

Interesting motor though.

Jack

Originally Posted by jackerbes

I've tried the google translation, it is pretty much incomprehensible to me.

google translation - http://tinyurl.com/83xt27t

Interesting motor though.

Jack

sry about that. overall, besides i am not sure about the magnets (magnetic strength should be good, tell from the cogging; temperature not known), other materials are basically very good. Oh, forget about the bearings, i changed them when i rewind them.

worth the price, trust me.

Originally Posted by modisc

sry about that. overall, besides i am not sure about the magnets (magnetic strength should be good, tell from the cogging; temperature not known), other materials are basically very good. Oh, forget about the bearings, i changed them when i rewind them.

worth the price, trust me.

Not a problem, my lack of Chinese language skills is my problem, not yours.

I had a chance to learn Chinese, I just didn't get it done. Did I ever mention that I lived in Tsingtao China for one year in 1946-1947? I was 5 years old, my Dad was on a U.S. Navy ship that was home ported there at the time. We all left China just a little bit before Chiang Kai-shek did...

Jack

Originally Posted by jackerbes

Not a problem, my lack of Chinese language skills is my problem, not yours.

I had a chance to learn Chinese, I just didn't get it done. Did I ever mention that I lived in Tsingtao China for one year in 1946-1947? I was 5 years old, my Dad was on a U.S. Navy ship that was home ported there at the time. We all left China just a little bit before Chiang Kai-shek did...

Jack

Not your problem, it is google's problem^^

I cannot remember a thing about when I was five. For 50 years, China has a very big change now.

Originally Posted by modisc

Not your problem, it is google's problem^^

I cannot remember a thing about when I was five. For 50 years, China has a very big change now.

Yes these are amazing times. It is great that these discussions can go on. Your country is gaining freedom while we in the US are exchanging our liberty for tyranny.

Originally Posted by zeroback

Yes these are amazing times. It is great that these discussions can go on. Your country is gaining freedom while we in the US are exchanging our liberty for tyranny.

sometimes it is really difficult to make a comparision, since normally, i would only buy one specific motor due to my limited budget. If i can buy two same motor, it will be much easier to tell how good i can improve a motor by rewinding them, without changing the Kv sometimes.

Original post: http://bbs.5imx.com/bbs/viewthread.p...=18#pid8076847

2nd 4315 rewind as normal 24N28P dLRK-type windings: AabBCcaABbcCAabBCcaABbcC
single strand of 1.02mm wire, 13T (5T+(5+3)T) delta.

Some initial comparisons between 24N28P LRK type and dLRK type windings:

Two identical motors for rewind: dualsky 5015 series.

stator size: 4315
24N28P
lamination: 0.2mm

1st rewind with 24N28P LRK type:
1.02mm wire, single strand
A-b-C-a-B-c-A-b-C-a-B-c-
11T delta (1st layer 5T, 2nd layer 4T, third layer 2T)

2nd rewind with 24N28P dLRK type:
1.02mm wire, single strand
AabBCcaABbcCAabBCcaABbcC
13T delta (5T+(5+3)T)

It seems that LRK type winding (half teeth windings), may not have the advantage in slot copper coverage, comparing with dLRK type windings (full teeth windings). LRK type windings for 12xN14xP (x =1, 2, 3...) or 12xN10xP motors, have the highest winding factor for distributed windings, 0.966, where the winding factor of dLRK type windings is 0.933. However, when using LRK type winding, more layers will be used, which will decrease the actual winding factor. It is hard to determine whether the benefits of LRK type winding will out weight its disadvantages, when comparing with dLRK type winding, for a stator of this size (4315). But 13T for dLRK and 11T for LRK, the copper coverage is obviously much better when using dLRK type winding using this wire size for this specific 4315 24N28P stator.

If using the same wire size, what prevents fitting the same number of conductors per slot?

Greg