Turnigy 80-100 130kv ---> 75 kv

[Bazaki]

Guys,

I would like to turn my 130 kv Turnigy motor into a 75 kv motor.


Crossbreak answered this:

Very nice design ! But by solder the 80-100-130kv in star it is possible to get 75kv, can someone please explain how ?

-The 80-100-130kv has 8 turns per coil that are wired in DELTA, so the "return wire" of Phase A is connected to Phase B (forward wire), the return wire of B with C and of C with A.

-If You now wanna wire it in STAR, you have to devide your phases in forward and return wire and wire all three return wires to a short circuit point outside the housing (inside is a more difficult job).

-The KV will be reduced by sqrt(3) so 130/sqrt(3)=75 the torque will rise in the same manner.

I yet don't really know how to seperate forward an return leads.Turning the rotort to induce currents in the coils "by hand" should be possible. The seperated wires would be short circuit by good guess with an old fashioned analog current meter. If current flows, the wires are of the same phase.

But that way I won't know which one's forward and which one's return lead :? . Any ideas to identify them is welcome.

Lebowski answered this:

ok, the clue is to connect everything in a triangle.

Take one winding (lets call this one 1), this is your reference. Spin motor (drill press ?) and measure AC voltage accross this
winding using normal multimeter (in the AC setting !!!!).

Take another winding (2 ?) and connect it to the first one in series. Measure the total series AC voltage. I know it sounds a bit
strange but the total series AC voltage should be equal to the AC voltage of a single winding. If you measure around 1.7 times the
voltage of a single winding then reverse the connections of winding 2 to end up with an AC voltage equal to that of a single winding.

Now connect the third winding (3) in series with 1 and 2 and measure the AC voltage again. If you measure 2 times the voltage
of a single winding, reverse the connections of winding 3. If the total AC voltage of the three series connected windings is 0 then
you've connected everything in the correct order. You can now short the start of winding 1 with the end of winding 3 (remember,
the voltage was 0 so this is no problem).

Now you got your 3 windings connected in delta.

First I would like to open it up, the other topic with rewinding the Turnigy motor is some how a different type of motor, mine is about 3 years old but never used.
Can someone please explain how to open this motor, it looks like it is glued or something I don't want to hammer it to hard and it looks like it is impossible to open

 

[AussieJester]

You have a version one Turnigy, comes without the skirt
Bearing, and is glued, heat it in the oven then press the stator
Off the shaft its glued onto.... Alternatively, you could sell it to me
I also thought torque was less with wye terminated motors
Compared to delta, with everything else being equal?

KiM

 

[bearing]

If you can get a controller which handles 1,73 times higher phase current limits, and use a battery with 1/1.73 of the voltage, it will be the same thing as reconfiguring it from delta to WYE.

 

[mauimart]

I rewound this motor in wye configuration and it is around 70kV. It's installed on my second build which is currently under construction. Preliminary tests were promising - plenty of torque and speed running at 70V. Here is a link to some additional info:

Rewind video
http://www.youtube.com/watch?v=ccmr3ix8ebk

Prototype in action
http://www.youtube.com/watch?v=EVIq_bF9XnI

 

[Bazaki]

Yes One motor is getting rewinded, but in mean time i want to do some test with an 18 fet Ebike controler and I need shaft speed of max 3000 rpm, with max power therefore I think it is better to run at 44v at 75kv instead of 22v at 130kv. I will heat the motor and see if I can open it.