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Old Nov 08, 2013, 02:30 AM
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manuel v's Avatar
Mexico, BC, Mexicali
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Rewind one PA Thrust 20.

I have a motor to rewind,
This motor is used with an APC 11x4.7 SF and 3s lipo.
I find heavy load, because the motor weighs 71 grams and has a kv of 1030 according to the manufacturer.

Either way the motor is burned.

Manuel V.
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Last edited by manuel v; Nov 08, 2013 at 12:32 PM.
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Old Nov 08, 2013, 02:37 AM
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Mexico, BC, Mexicali
Joined Aug 2004
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Disassembly of the motor is more difficult than normal.
The motor has a pin between the stator and the base, with some sort of bonding glue.
Removing it was somewhat laborious.
After having a couple of clips that also must be removed.
Now if the engine is mounted on a base and is heated with air gun.
Once hot, the stator is covered with a suede and clip is removed.
Be very careful because the stator has a very thin laminations.
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Old Nov 08, 2013, 02:41 AM
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Mexico, BC, Mexicali
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Remove the wire was a headache.
The wire is coated with epoxy and need to remove it into many pieces.
I lingered forever.
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Old Nov 08, 2013, 02:46 AM
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Mexico, BC, Mexicali
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The motor has a Kv of 1030.
But few Turns?

To find out, rewind one test with 10 turns of wire no. 26 awg.
this was the result.

18,300rpm. , 10.94V, 2.73A. Kv 1672.

Drive calc6.
16 Tuns DLRK Delta= 1045 Kv.
33 Tuns Half parallel Delta= 1013 Kv.
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Last edited by manuel v; Nov 09, 2013 at 04:16 PM.
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Old Nov 08, 2013, 02:50 AM
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Mexico, BC, Mexicali
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I decided to rewind in Half Parallel with 33 turns of 25AWG
But if I can put 34 turns, so I will.
A slightly lower Kv, will allow the motor to use the propeller with less risk of burning.
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Old Nov 08, 2013, 02:51 AM
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Mexico, BC, Mexicali
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The motor now has 34 turns 25AWG,
Half parallel wind.

Manuel V.
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Last edited by manuel v; Nov 09, 2013 at 01:31 AM.
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Old Nov 08, 2013, 02:52 AM
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Mexico, BC, Mexicali
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No load.

11,100 rpm, 11.3 V, 1.04 A, 982 Kv.

Drive calc= 978 rpm/V, Rd= 112.5 mOhm., Kt= .966 Ncm/A. Max Eta =80.7% to 96 watts.

APC SF 9x4.7, 8,800 RPM, 10.63 V, 13.69A.
GWS 10x6, 8,700 RPM, 11V, 18.35A.
APC e 10x7, 8,200 rpm, 11.15V, 22.70A.
APC e 12x6, 7,400 rpm, 10.67V, 24.95A. 266 watts.

Manuel V.
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Last edited by manuel v; Nov 09, 2013 at 03:51 PM.
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Old Nov 08, 2013, 04:53 AM
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Fourdan's Avatar
Antony (France)
Joined Sep 2003
3,016 Posts
Hi Manuel
Great
For information what are the diam x length of the stator ?
Louis
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Old Nov 08, 2013, 12:32 PM
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Mexico, BC, Mexicali
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Fourdan.

30.5 x 7 mm stator.
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Old Nov 09, 2013, 03:57 PM
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Mexico, BC, Mexicali
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Drive calculator.
PA Thrust 20 vs PA Thrust 20 Rewind, Low Kv.
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Last edited by manuel v; Nov 09, 2013 at 04:10 PM.
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Old Nov 09, 2013, 06:34 PM
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Colmenar Viejo - Madrid - Spain
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Excelent job.

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Old Nov 09, 2013, 07:33 PM
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Thank you Jose Luis.



This Motor is well above others in its category.

Manuel V.
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Old Nov 14, 2013, 06:15 PM
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United States, CA, Encinitas
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Great Work! Thanks again for the rewind, excellent job detailing your work!
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Old Nov 14, 2013, 06:54 PM
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Jhilgart.
Thank you very much.

Today at 5 pm I'm sending the motor back.
Possibly it delivered on Monday.

Manuel V.
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Old Nov 14, 2013, 10:09 PM
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Canada
Joined Nov 2000
7,239 Posts
Nice work. You've turned a dog into something decent.
But imo it remains an Odd motor ..
Being more Case than working motor. Ring and stator is a % of it's overall size.
Designer must have been told that bigger is better :-)
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