Serious HES derivative project proposal

[kolbacict]

And in this video, a three-phase current supplied from a frequency converter, unfiltered from higher harmonics.
See the difference...
https://youtu.be/jww9Hyhh9G0
p.s. Very bad camera. The good camera in my phone broke.  It would be much better.

[Cadman]

Hi Cadman,
...
Is it possible, or practical/feasible, to excite your 36 coil stator with a 3-phase source, like a VFD? I think you could connect the coils in such a way as to get a decent RMF.
...
bi

A VFD? Sure, that would be a fine 3PH supply for bench tests, and I happen to have one.
But, can you power it up to a run state when you're without utility power or any means to feed it the AC it needs? The same question applies to any bench power supply or anything else that needs to be fed mains AC.

Now if someone donated a simple circuit that would take DC from a 5-6 volt or 10-12 volt battery and output a usable 3 phase AC sine then that would be wonderful. _{I think I already said that somewhere}

We can have a battery or some other means of DC current to start it up. That's both a limitation and requirement for this project. Maybe unspoken, but that along with self running and a usable wattage output is the end goal.

[bistander]

kolbacict,
Nicely done, it does demonstrate rotation. Filtering likely would help round out the hex, but I wonder how much that is you needed. Is it a 6 pole stator?
bi

[bistander]

A VFD? Sure, that would be a fine 3PH supply for bench tests, and I happen to have one.
But, can you power it up to a run state when you're without utility power or any means to feed it the AC it needs? The same question applies to any bench power supply or anything else that needs to be fed mains AC.

Now if someone donated a simple circuit that would take DC from a 5-6 volt or 10-12 volt battery and output a usable 3 phase AC sine then that would be wonderful. _{I think I already said that somewhere}

We can have a battery or some other means of DC current to start it up. That's both a limitation and requirement for this project. Maybe unspoken, but that along with self running and a usable wattage output is the end goal.

Hi Cadman,
Sure, I've used a number of different VFDs on DC (battery) supplies. Commerical VFDs consist of a rectifier, DC link, and inverter. It's typically easy to connect directly to the DC link. Of course a 230 VAC VFD requires ~312 VDC (some can go low as 130VDC). Then you can set the output 3-phase voltage & frequency where you want. But remember your washer motor was for 220V, right? Wonder what the actual coil voltage was.

It might be possible to hack a VFD to lower voltage input, but I've not seen it. I do know there are 3-phase VFDs made for single phase inputs, 110VAC, I think. I've got a standard 3/4kW model where I put a voltage doubler on its rectifier so I can use it in my shop/lab to power induction motors from single phase 110.

As far as your eventual output voltage, that will depend on the turns and coil connections of your armature. (I'm calling the stator the field and the powdered Fe sectors the armature) If you can rectify your output to 200-300VDC, you could certainly use it for a VFD input.

It's easy for me to think the VFD is best because I've got one on the shelf and could have it running in short order. But it's your baby and do what works for you.
bi

ps. Just remembered there are 3-phase motor drives made for low voltage inputs. They are used on battery powered industrial vehicles and golf carts. Even for RC models and probably drones.

[Dog-One]

Just remembered there are 3-phase motor drives made for low voltage inputs. They are used on battery powered industrial vehicles and golf carts. Even for RC models and probably drones.

Yeap.  Take your pick:
https://kellycontroller.com/product-category/kelly-motor-controllers/sinusoidal-brushless/

I have a 24 volt golf cart unit that does not require hall effect sensors.
Worked great for what I used it for.