Charging trough motor stator. How does it work?

[Centurio]

I have red about the charging trough motor stator in the Powervelocity controller and the nuclear controller thread.

Powervelocity:

Charger mode via motor stator added as a standard feature on all controllers

and

Charging voltage can be any DC source from 12v up to the target voltage of the battery (not above it)

Nuclear:

Charger mode - use any DC source, just connect one phase wire to charge your battery

This is a nice feature of the controllers. But I am wondering how this works? I did a research about motor stator charge, but there are not free informations about it. Probably I did not search for the right words. I am interested how efficient this can be and how much power it can handle. But most of "how does it work"?

May someone help me out here please?

 

[amberwolf]

It's just replacing part of an SMPS charger with the motor phase as inductor, and controller as rectifier/synchronous booster; more or less the way good regen can work, except the power source is a plugin instead of motor rotation.

Adappto was the first I know of to do it, but they're no longer available.

I don't know anywhere that shows exact details on the process, as it's software controlled, and that's usually proprietary.

Also no idea on efficiency or powerhandling; those are likley very dependent on specific components (battery, motor, controller, software, external power supply, possibly even state of charge.).

For more details you would have to contact the system manufacturer. If they won't tell you, you'd probably have to buy a system and reverse engineer it.


BTW, it wouldn't just be one phase wire, it would have to be that wire and a return, probably battery/system negative.

 

[Centurio]

Thank you amberwolf.

Nono, I do not need to reverse engineer it. Just how it works.

BTW, it wouldn't just be one phase wire, it would have to be that wire and a return, probably battery/system negative.

This makes sense. So there must be an additional connector on the controller which contains a phase wire and probably the batttery negative. The charger connected to these wires will cause an induction in the motor (coils?) and flow to the controller, which adjust the voltage to the desired value. So it's not a miracle, but quiet nice. But shure the efficiency might suffre with all these transformations.

One can buy a 2kW DC Transformator with 50V and use it to charge 14S li ion (and above) battery packs. With sacrificing efficiency but the flexibility to have one charger only for all battery packs. If needed of course.