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Jul 26, 2020, 10:35 PM
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Help!

BadAss 2820 innov8tive- 7t 901kv trying different wires


These motors have really big 5mm wide bearing casings
Tried 7t 19awg HP wye for 901 real tight... filled in 4th head and it shorted on a sharp edge.

Rounded edges, applied harbor freight bake on powdered paint, decided 2nd to try a multistrand wind.
7 T of 25 awgx5 in HPy good for 27 amps.

Wound first head and I just don't see it working

Some of you may do this, Skyler did for that para-sail motor, and I remember taking apart lots motors, maybe did I just not go small enough with wires or should I have twisted them?

Only thing I can think of now is to just go back to the single strand of 19awg, for 28amps trying 7t for 901 *** or 7-6-7-6 pattern for 975kv or 6t 19awg for 1050kv for a 12" prop or go down to 20awg and accept 22a limit for HPy motor about 240 to 268 watts depending lipo or a123 both still good to give 3# thrust

How or what combo wires would you have used for a multistrand, how to make it work?

Leonard
Last edited by leonard3k; Jul 26, 2020 at 10:48 PM.
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Jul 27, 2020, 06:06 PM
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Trying again 7T 19awg for 28amps


So I DID get 7T of 19 to fit before, going to try it again more carefully.

If the paint doesn't chip off, I wind carefully, should fit. I wind the odds first and then cram the evens in between two wound odd stator heads
Last edited by leonard3k; Jul 27, 2020 at 06:19 PM.
Jul 28, 2020, 02:47 PM
sneu's Avatar
The Harbor Freight powder coating material is generally polyester based and is not same as the electrical grade epoxy based materials---there is no surprise that it does not stick well. Even of you had the "good stuff" it would likely also have adhesion problems to the cured material. You might be better off with Nomex paper protectors on the ends of the stator.

Steve
Jul 30, 2020, 11:21 PM
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BA2820 finished


One thing stands out about these BadAss motors from Lucien at Innov8tive Designs are the 5mm wide bearing casings.

A stator came with a head plate lifted off a little bit, and I was really trying hard to get 7T of 19ga for 900kv. The stator heads corners were pretty sharp, poked-shorted out a strand, so I tried what Ronaldo said he used to do, grinding the corners and painting or insulating again...couldn't get that Harbor Freight Bake On Powder Paint to stick good, seemed like it did when I put it on the Suppo 2217 and I have used it off and on other motors too... not this time

20ga would still give a power limit with the HPy termination of 22 amps and I could get it in without shorts.

Today holding the motor with a gws 12x8 I took it to rpms for 3# thrust about 48 mph, did good and only used 18 amps so 4 more amps headroom, tho it did run a little warm

Tried a 12x8 on a similar 28mm motor at 1270kv and I really saw that amount KV wasted a lot of energy.

Six turns on this BA 2820 would give 1050 KV, so far 900 kv is still OK for use with a 12" prop, I still want to try the 19ga for a 28 amp limit and the lower resistance OR 4T of 15ga dLRKy for 788kv, that wire is 1.45mm diameter would give 28 amps, another hard challenge or question of fit
Jul 31, 2020, 03:31 AM
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Fourdan's Avatar
Hi Leonard

You rewound what stock Badass reference?
Following your results I guess that Badass is indicating turns per slot (not per tooth)
2820-780 : 14t D (7+7)
2820-1080 : 10t D (5+5)
2820-1350 : 8t D (4+4)
Right ?
And you made (7+7) HP Y to get 900 rpm/V ?
Louis
Aug 01, 2020, 01:59 PM
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Hello Fourdan
Stock reference....? well I ordered 6 of the 2820 motors not wound... but Lucien sells a 7t delta 780kv and this one test wind follows that exactly. For HP y it's 7t for 901kv and I got 899kv

How hard do you think it would be getting 7t LRK y for 858kv.... would be good for 28amps on a wye motor... was thinking about ordering some 15g and 16g wire.

These motors have lots of room between the stator and the rotor...not tight like a Suppo motor.
Last edited by leonard3k; Aug 01, 2020 at 02:09 PM.
Aug 01, 2020, 03:12 PM
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Fourdan's Avatar
Hi
The ratio LRK / dLRK is roughly ~96% ... 96.5%
Starting from dLRK 899 rpm/V you could be around 860 ... 870 rpm/V
Please do and inform the community on your measurement
Louis
Aug 01, 2020, 03:15 PM
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Fourdan's Avatar
Hi
How much you have paid for a not wound 2820 Badass ?
Louis
Aug 01, 2020, 10:52 PM
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Hello Antony, your mssg box is full

I did the motor test both times using my optical tach and eagletree, did the first test 3x and the final TC7 sheet has the real figures I used winding a 10T dLRK y giving 315kv.

The repeated test for completed motor Optical Tach and Eagle Tree read 11760 and 11790 rpm / 13.1v and Io= 1.7a

11775rpm/13.1v = 898.855kv This method has always worked good for me

Did you see how tight the relationship of numbers stock 7t 780 delta, My 10t test wind, and the finished motor only 3 pts lower than prediction?

Leonard
Aug 02, 2020, 03:08 AM
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Fourdan's Avatar
Quote:
Originally Posted by leonard3k
Hello Antony, your mssg box is full

I did the motor test both times using my optical tach and eagletree, did the first test 3x and the final TC7 sheet has the real figures I used winding a 10T dLRK y giving 315kv.

The repeated test for completed motor Optical Tach and Eagle Tree read 11760 and 11790 rpm / 13.1v and Io= 1.7a

11775rpm/13.1v = 898.855kv This method has always worked good for me

Did you see how tight the relationship of numbers stock 7t 780 delta, My 10t test wind, and the finished motor only 3 pts lower than prediction?

Leonard
Hi Leonard
Your result and the stock results, concerning the products Kv x turns(per slot) are coherent
dLRK Delta all serial : product around 10800
dLRK Star all serial : product around 6300
dLRK Star HP : product around 12600
I am Louis (living in Antony), my RCG inbox is (now) not full
Louis
Aug 02, 2020, 11:23 AM
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Thread OP
Hey Louis I didn't notice you are referring to Turns x KV = Product

Just like I do... HPy 7t x 900 = 6300 except I only refer to it in "Turns"

"dLRK Star all serial : product around 6300"

I found that useful


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