12N8P's ABCX4 STSD winding

[modisc731]

HK4025 12N8P

STSD winding

1.3mm, 7+8T, delta
1.5mm, 5+6T, delta

[ZuvieleTeile]

STSD winding is an interesting concept!
I see a lot of possible problems due to lack of space underneath the stator holder and thus possible shorts, if not bent and sorted very meticulously.
Also the prep time for soldering is huge and cumbersome.

[modisc731]

Originally Posted by ZuvieleTeile

STSD winding is an interesting concept!
I see a lot of possible problems due to lack of space underneath the stator holder and thus possible shorts, if not bent and sorted very meticulously.
Also the prep time for soldering is huge and cumbersome.

For ABCXn windings, STSD, though very time consuming, the ends can be arranged neatly at the bottom. But for other types of windings, like the very popular dLRK for 12N10P and 12N14P, Powercroco's 6-wire technique is indeed the most ideal solution (for YY, there are only two Y-node at the bottom).

[powercroco]

the STSD winding will be very interesting in "solid slot" (0,5T) oder 1turns windings.

impossible for serial use - to much work, to much possibilties for mistakes or bad soldering.

but for our special use in single parts of course worth to think about.

[modisc731]

Originally Posted by powercroco

the STSD winding will be very interesting in "solid slot" (0,5T) oder 1turns windings.

impossible for serial use - to much work, to much possibilties for mistakes or bad soldering.

but for our special use in single parts of course worth to think about.

STSD is surely not suitable for massive production for RC motors (Most servo motors use STSD, but the winding is done by machine, and their stators are actually "pieces of teeth" that are assembled after the winding is done). The benefit is probably only 1 or 2 more turns than conventional winding technique, but the cost is much more time. As all my motors are for my own collection, I would treat every detail carefully, so insulation (measure resistance for any short; high voltage electric arc test), soldering, protection of the soldered ends and etc are all granted. But again, the cost is much time.



For 40XX stator, probably 1.4mm wire is the best solution as can be done in 6+7 mode.
13T 1.4mm > 15T 1.3mm > 11T 1.5mm > 7T 1.8mm.

[HeliFX]

instead of twisting wire together perhaps wrapping thin wire around the joining wires and then solder may help save space.

also "liquid duct tape" covered around the termination alongside heat shrink tubing

[modisc731]

Originally Posted by HeliFX

instead of twisting wire together perhaps wrapping thin wire around the joining wires and then solder may help save space.

also "liquid duct tape" covered around the termination alongside heat shrink tubing

I used that technique for securely soldering the ends in other circumstances to save some room and yes, it works well. But it will take more time to do so. So far, at least for 12N8P, those ends can be safely packed inside the motor, especially for a Delta connection (no big Y node). Following is 2.24mm wire for an inrunner stator, distributed winding. The wire is too rigid for a "twist", considering the limited room. also note the Y-node is actually a Y-ring in this situation. This is a 9N8P AaABbBCcC Y STSD winding, with the connection ends placed on both upper and lower surface of the stator (normally, those ends are packed on just one side of the stator).



I normally will cover the ends with PVC SILICONE FIBERGLASS SLEEVING which protect the ends better than heat shrinking tubes, quite cheap for normal sleevings (tolerate around 100 degree C, as rated). There are better materials but a bit more expensive, and since i need various sizes of these tubes, i do not stock or use them. I normally will add some epoxy to fix those tubes tight

[HeliFX]

yes I cap all my termination with GF sleeve but add heat tubing for added holding power and eliminate chance it breaking loose under use.

[modisc731]

HK 4035 12N8P

STSD
1.4mm
6+7T delta

[1BOHO]

ABCX4 is that ABC parallel four times but wired ABC starting the new delta every 30 degrees? or ABC in each quadrant?

1BOHO

[prototype3a]

Looks like he terminated it delta and it's wound ABCABCABCABC but with his 'standard' STSD technique.

[1BOHO]

What Im wondering is is if this is esentially 3 triangles 30 degrees out of phase mechanically?

ready to start tining some wires....

[prototype3a]

I'm not sure I follow what you're saying. Can you post larger photos? They're kind of small and hard to make out what you have there.

[1BOHO]

If you click on them they are larger. What I have is the coils wound 6 turn per arm with 1.3mm single strand. The end have cut and layed the leads equal length . Could u start a new delta or "triangle"ever stator tooth .
1BOHO

[1BOHO]

Prototype Im thinking ABCABC/ABCABC ?

[prototype3a]

I don't think 6 phase will work with ABCABC/ABCABC but you can definitely parallel the two half motors and terminate either delta or wye.

[1BOHO]

They are seen ad two seperate motors in parallel? So you should be able tho drive them in seperately six phase. With a six phase controller???

Anyone???

[1BOHO]

Here modisc,

STSD winding....

Time to check for shorts.....

TTYL

1BOHO

[prototype3a]

I could be wrong but here's my thoughts...

We essentially run our motors like 3 phase induction motors with 3 waves 120degrees apart. I'm assuming a 6 phase motor would be run with 6 waves 60degrees apart. In this case what you're describing would not work because the motor is really wound as two 3 phase motors. You *could* run each half of the motor with individual ESCs but that would be silly.

BTW, when you click on the pictures, they do get larger but they are still quite small.

[1BOHO]

No, I Plan to build the bridge a single 12 channel bridge to drive the motor. The heart of my design is a DSPpic30f2010F PIC16 bit MCU and the fets are IR IRLS4030PBF NPN's and very nice hi and low divers and opamp comparators for the current watchdog duty. Unfortunately I meant to order the 7 pins higher amp rating but each one of these fets is 152amperes. Each bridge will consist of 5 on the hi and lo side in parallel. Im also considering Field Oriented Control. Not the standard zero cross sensorless control.

4 or six phase operation will produce more power. This is for me and has been planned out for some time now. Not at all self aggrandizing and would love constructive input if anyones willing to speak up. Seems quiet lately......

http://www.motoredbikes.com/showthre...Project/page10

TTYL
1BOHO