I would suggest that You model your Motor after an existing design.
A good example might be the 3-Phase Prop-Motors used in Hobby-Models.
They are outrageously powerful for their size,
and will start in any position, every time, without fail,
they also provide full-power-Braking, and reasonably smooth output.
They can also be "cogged" similar to a proper Stepper-Motor if desired,
but this will require custom Electronic-Controls.

The ESC's ( Electronic-Speed-Control ) Modules usually paired-up with these Motors eliminate
the complexities of designing your own specialized Speed-Control and Braking Circuits
which will be required when using a "one-off" special 2-Phase design.
.
.
.

 

which will be required when using a "one-off" special 2-Phase design.
.

It could well also be a SRM being it's 2 phase.

 

These guys are reputable - https://www.kjmagnetics.com/categor...xUiLx_maHq8CiExPmUgKe3-UlSjlIqycaAtbtEALw_wcB

Great, thank you!

 

It could well also be a SRM being it's 2 phase.

Its sort of the opposite of that. Its more like a switched acceptance motor. All will make sense when I unveil it. I need a reliable driver circuit for it though. I have created this drawing in an attempt to improve my design. Its basically an H bridge but using enhancement and depletion mosfets I can switch the entire thing with just one signal. That will be a big deal when using it as a servo or a stepper motor. General purpose use it won't matter so much other than reversing.

Without further adieu here is my new design:

 

I am considering using the following two FETs for this:

Depletion mode GP2T080A120H: https://semiq.com/pdf/GP2T080A120H.pdf
Enhancement AS1M080120P: https://media.digikey.com/pdf/Data Sheets/Anbon Semi PDFs/AS1M080120P.pdf

Will these work in my circuit? Can anyone offer better(especially cheaper!) suggestions? This setup would need about $100 worth of mosfets. I have a lot of salvaged parts, but I've only found one depletion mosfet so far.

 

Alrighty. Here is my current circuit plan. The mosfets I have picked for the main channel are picked very carefully for matched timing and low impedance. I added TVS diodes by each gate to protect them, and I redesigned the base circuit so it will actually work instead of my previous design that would have actually been stuck with a high side bias instead of switching like intended.

 

For my gate control circuit I have a IRF3205 (Q12 in diagram) for the low side and ZXMP4A16G (Q13 in diagram) for the high side. Does anyone have a better recommendation for transistors in those two positions?

 

The P-FETs in your post #26 schematic are upside-down.

 

The P-FETs in your post #26 schematic are upside-down.

Oh weird! That's how KiCAD placed them and I didn't even notice. Thanks. I'll fix that

 

Ok here is the fixed version with a couple of updated notes added

 

The SS41 does not look connected correctly. Pin 2 is ground and pin 3 is the output. What is the purpose of C3 and R7?

 

The SS41 does not look connected correctly. Pin 2 is ground and pin 3 is the output. What is the purpose of C3 and R7?

KiCAD doesn't have a footprint for the SS41, so its more of a representative drawing. C3 is supposed to be for galvanic isolation, but its a concept I need to play around with. R7 probably is pointless honestly. Its just providing a bit of voltage division where it is, but that's probably not needed.