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Old Mar 15, 2013, 07:40 AM
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Quote:
Originally Posted by manuel v View Post
I have similar motors.
All with 6 turns for around 2745 Kv
For problems with the tachometer, I have a correct measure of one of these motors rewind to 5 turns.
I measured Kv 3100. But Turn calculator indicates 3294 Kv.

With a 70mm clone DF 5 blades, consumes 50A to 14.7 volts for 735 watts.

With 3700 Kv put us on the range of 1000 watts
and with 4000 kW at 1200 watts. approx.

With a 6-blade clone even higher in watts.
I was just looking closer at you Kv figures vs # of turns. Hard to fine tune when one turn = approx 500RPM. I imagine a star termination for 3700 Kv would be 2T
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Old Mar 15, 2013, 02:30 PM
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considering that six turns are 2745, then 5 turns will be 3294,
4turns 2/3 will be 3534,
4 turns 1/3 will be 3803.

This is accomplished by rewinding the first wire, first tooth with 5 turns, the following second and third tooth with 4 turns.
The second wire 4 turns first tooth, second tooth with 5 turns, third tooth with 4 turns.
The third wire, first and second tooth with 4 turns and the third tooth with 5 turns.
That equates to 4.33 turns. for 3803Kv.
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Old Mar 15, 2013, 07:06 PM
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Thank you thank you, I have more motors and fans coming I'm gonna wind one to each of those Kv's. I have 4 different 70mm fans on hand and 6 more coming, all different. This will be a fun test as the EDF guys run those straggly wound motors to the absolute melting limit of their windings. Literally. I think I'm gonna get 4 turns of 16AWG on the left over FreeWing stator. The Preece rating is 117A oooahhh. The stock wire is 22.5AWG 40A is it's utter limit and looking at the EDF threads that's were they run them.
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Old Mar 19, 2013, 08:24 PM
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Time to build the torture chamber.
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Old Mar 31, 2013, 07:53 PM
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I sent an email to the fellow at EDF hobbies inquiring about the process of balancing EDF units. The question was, "do you have to take the motor out to balance the unit"? The answer was, "after I assemble the unit it should not be taken apart". I take that as a yes.
The cause of the question was I found that installing a hard wire motor in the housing to be some effort not to bend the wires so many times they work harden and brake. After receiving 9 of the 10 EDF housings I see the wire routing through the housing is a bit different with each one, some provide no room for outrunner mounting although the spec sheet claimed it would run both in and outrunner motors.
Which brings me to this experiment to terminate soft wire to the windings inside the housing. In this experiment I wound up a 5T 2220 stator with some 18AWG. I was out of 18 silicone wire so for this test I used 16AWG. I think this will work with out modifying the bearing tube design when rigged with 18 gauge fine strand. With a little more practice I should be able to make it look nice. The other plus as I refine this technique I will use it on my prop motors to give a little OEM feel for rigging.
I should have the new BT back from my part builder shortly, to test fit. Once I have the kinks worked out (pun intended) I'll give this 5T a proper wind and modify the 4T to soft wire. That will make the motor changing from housing to housing easier for the testing.
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Old Apr 13, 2013, 03:13 AM
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The replacement bearing tube and the last fan I ordered for the project has arrived. Although I haven't yet figured all the details of the thrust stand.
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