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Electric Motors Winding and Repair Electric Motors Winding and Repair Discussion


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Old 10-10-2015, 07:04 PM   #41 (permalink)
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Quote:
Originally Posted by Ch.Lucas View Post
Hi 1BOHO ,

with a sinwave esc you can place loss from the motor in the esc . So less loss in the motor but higher los in the esc . I highpower electric drive the mmf diagram is messured and saved as a datafile that is then feed in the esc . With it the esc can now folow direct the mmf wave ,best way toget highest efficancy and control for electric drives .
The attatched pic show the rotorbell from Flyware with 10 pol system ,two strip are one pol .The 20 magnetstrip are placed equidistant so between one pol is a distance that lead to a lower peak induction moving over a statortooth with a result that the mmf has a moore rectangular wave form that is most used for modelmotor esc .


Hi Ch. Lucas thanks for sharing. There are a few foc coming or in the market. At one time Hacker had a "sinus" drive and motor. Never knew what happened with it.

Anyway here is a video of microchip dspic board running a concentrated wound outrunner with sinusoidal commutation code modded for use with hall sensors. Excellent low speed control.

Microchip AN1017 - Sinusoidal Control of PMSM Motors (2 min 0 sec)


In depth Ti Insta spin video about FOC its very long over an hour but very informative as to what and how this commutation style works.
Field Oriented Control of Permanent Magnet Motors (53 min 44 sec)
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Old 10-12-2015, 11:00 PM   #42 (permalink)
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Nice Chris,
Love the keyed can design almost looks like it was broached as sharp as the channels corners look. What material is the stator bell made from?. Major magnet coverage there also. What does the stator lk like?

TTYS
1Boho
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Old 10-14-2015, 11:10 AM   #43 (permalink)
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Quote:
Originally Posted by 1BOHO View Post


Hi Ch. Lucas thanks for sharing. There are a few foc coming or in the market. At one time Hacker had a "sinus" drive and motor. Never knew what happened with it.

Anyway here is a video of microchip dspic board running a concentrated wound outrunner with sinusoidal commutation code modded for use with hall sensors. Excellent low speed control.

Microchip AN1017 - Sinusoidal Control of PMSM Motors - YouTube

In depth Ti Insta spin video about FOC its very long over an hour but very informative as to what and how this commutation style works.
Field Oriented Control of Permanent Magnet Motors - YouTube
Thanks for the resources. Is there supposed to be sound for the second video? The slides seem a bit slow without voice.
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Old 10-14-2015, 03:46 PM   #44 (permalink)
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I get full sound in both videos on all my media devices. XP, Vista, Windows 7, an Android OS.
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Old 10-14-2015, 06:31 PM   #45 (permalink)
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Thanks. I get sound on first. Will reload, reboot and if necessary try another device.
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Old 10-14-2015, 06:43 PM   #46 (permalink)
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Default Magnets

About better materials. Anyone know what process would be used on a magnet to increase max operating temperature rating by 100 degrees Celsius? Isn't this what scorpion did?
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Old 10-15-2015, 01:23 PM   #47 (permalink)
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Default Asymmetrical Brushless

ASYMMETRIC BRUSHLESS PART 1 (21 min 29 sec)

ASYMMETRIC BRUSHLESS PART 2 (24 min 34 sec)
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Old 10-15-2015, 03:20 PM   #48 (permalink)
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Default Efficiency governs power.....

Hi Christian and Ron in the light of asymmetrical winding I thought I would share this video with you and all interested. Sorry if its brushed motor but certainly this is showing some efficiency.....and could possibly be utilized in a brushless format.

20090823173537 (7 min 42 sec)
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Old 10-27-2015, 12:29 PM   #49 (permalink)
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Default Special Process to raise max operating temperature.

No bites on the free energy motor?Its controversial to say the least. I found it interesting especially the bldc asymmetric winding with hall sensor. Seems worth some experimentation.

@Chris,
Still searching for a "special process" to raise the operating temp of an n50 magnet. All Ive found thus far is size and shape matter. I dont consider selecting a magnet with different physical dimensions a special process so I think my post only promotes what seems to be a myth. I hope consumers aren't being led by false advertising.That would certainly be the wurst thing to do... The statement is also not really accurate that other manufacturers n50 have a curie temp of 80* Celsius. From my research that number is the max operating temp not the curie temp. These are not one in the same. Max op is the max temp that can be seen before the magnet starts to lose but it can be reversed. Curie is to the point of no return. So Im still trying to figure than one out.While on the topic Christian have you ever seen a N64? Im reading there may be such a thing usually only available to the military....

Here is a few links on the topic.

https://www.kjmagnetics.com/blog.asp...dymium-magnets
http://www.ndfeb-info.com/neodymium_grades.aspx

TTYL
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Old 10-28-2015, 01:34 PM   #50 (permalink)
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hello, mind if I ask a few questions?

one, if a motor has an efficiency of 90% is it safe to say that 1 out of every 10watts is heat?

How many watts of power would a motor of 99% be compared the one of $90 all else being equal?

If more copper fill meant less resistance but less space for wind cooling generally there would be an increase in efficiency due to less winding resistance and heat, therefore less cooling would be needed (there's an effect here not easily understood which could be introduced, a later time for that).

I understand some of the motor winding crowd are motor engineers/pro/hobby re-builders with years more experience and would like to see some math on the hypothetical 100% or near efficiency motor.

and, do I understand the temp of the magnet is responsible for efficiency as well as the stator and winding?
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Old 10-28-2015, 02:19 PM   #51 (permalink)
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Hello,

"Typ kv wdg ~1/Fluss Fluss relativ
Torcster N5065/6: 394 x 12 = 4728 89%
Hacker A50-16L: 270 x 16 = 4320 97%
Conrad BO 4570-10: 430 x 10 = 4300 98%
Hacker A50-12L: 350 x 12 = 4200 100% -arbitrarily set to 100%
Hacker A50-14L: 300 x 14 = 4200 100%
Hyperion Z4035-12: 345 x 12 = 4140 101%
Conrad BO 4570-10/2: 400 x 10 = 4000 105%
Hyperion ZS4035-10: 354 x 10 = 3540 119%"

.....have always in mind that every motor can handle much moore load if the cooling is well designed"
~Christian Lucas~

If the magnet plays a part in creating torque and in rising temps losses its magnetic force due to heat it doesn't seem that that would lead to a more efficient motor. The effect of heat or cold on the magnets is thoroughly documented in the links. Please read.
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Old 10-28-2015, 04:56 PM   #52 (permalink)
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Default Special Process to raise max operating temperature.

"......... I am not aware of any patents or articles on raising the operating temperature of Ne magnets."
Steve Buzolits
Arnold Magnetic technologies

http://www.arnoldmagnetics.com/Contact-Us

http://www.arnoldmagnetics.com/de-de/Patents

If someone has a link to such material please share it. It would be quite interesting ......
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Old 10-29-2015, 12:31 AM   #53 (permalink)
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260*C
http://www.zeusinc.com/advanced-prod...insulated-wire

SmCo
http://www.what-are-magnets.com/7arc...te-segment.htm

VACODYM, VACODUR,andVACOFLUX stator material
http://www.vacuumschmelze.de/fileadm...n-18112014.pdf
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Old 10-30-2015, 12:31 AM   #54 (permalink)
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http://www.magneticmetals.com/produc...or-laminations

Looks like a state side option.
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Old 11-03-2015, 08:40 AM   #55 (permalink)
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Hi guys,
Going to get a sample of this stuff in a square profile. This may end up being what I use exclusively to build better motors. Ill be sure to post photos so all the other winders can eat......Stay tuned I know you're watching.

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Old 11-05-2015, 02:24 AM   #56 (permalink)
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Default Switched reluctance motor.

Is there a place for the efficiency of a switched reluctance motors in RC?






http://machinedesign.com/motorsdrive...rushless-motor

Eat fellas.
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Old 11-05-2015, 06:37 AM   #57 (permalink)
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Don't think they are applicable for rc heli's given lower torque and higher vibration.
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Old 11-05-2015, 10:50 AM   #58 (permalink)
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Hi Rotorapture,

Yes but there is one thing I find unique reading about them. There is no loss of torque at higher rpm. They are not dependent upon one another in a SR motor. So while they may not be the ticket for a whirly bird they may be worth experimentation in other areas of rc hobbys and electric propulsion.
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Old 12-27-2015, 12:11 PM   #59 (permalink)
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http://www.autoblog.com/2011/06/28/n...e-motors-dont/


~allied express~
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Old 12-27-2015, 12:14 PM   #60 (permalink)
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Ive also recieved several samples on the PEEK coated wire and will share photos of whatever I wind with it ASAP.

Happy Holidays....
1BOHO
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