Driving 3p delta wound motor with H bridge.

[Jim-The-Dinosaur]

Hey. No particular project in mind, but just mulling the possibilities.

I've scavenged a few motor/wheel assemblies - one from an E-bike, one from an E-scooter. Both delta wind three phase. No specs.

Wondering how to build a controller (Yes, I know potted boxes are available online) over a beer, checking what's at hand, and came up with the following:

I have some bad arse 2Sk2698 N channel FETs in the bin.

I'm thinking totem pole 3p H bridge. Each phase output a totem pole config, the motor phase tap between the 'top' FET's source, and the 'bottom' FET's drain x 3. Obviously three of the FET's gate signals inverted. A 4017 reset on output 3 driven by a triple five to satisfy logic and vary speed should suffice. On paper.

Not looking for efficiency. just proof of concept on the drive stage. If it works, I'll Arduino code a proper modified sine to the FETs.

Most P-P outputs tend to use complimentary silicon, but I see no drunken reason why this wouldn't work.

Anyone want to pat me on the shoulder, or tear me a new one welcome to comment. If the latter, I'll know more than I did.

 

[Harald Kapp]

but I see no drunken reason why this wouldn't work.

Where wil you get the gate drive for the top N-MOS Fets, those with the drain conencted to the positive supply voltage? You will need a high-side gate driver to raise the gate voltage above the positive supply voltage.