Testing Jeep Wrangler 4xe P1 Motor-Generator (LG HV “Alternator”) with OpenInverter

[Yuyu29]

Hi everyone,

I’m starting a project to run the Jeep Wrangler 4xe (2021–2023) P1 belt-driven motor-generator using OpenInverter. This unit is interesting because it is relatively affordable and widely available in the US junkyards, yet it offers decent power and voltage levels compared to the usual HSGs.

What I know so far:

Officially called “Electric Motor / Alternator” by Mopar.

Part numbers: base 05190161 (suffixes AI, AJ, AK, AL, AM depending on revision/year).

Supplier: LG (logo visible on the nameplate → LG Energy Solution / LG Magna e-Powertrain).

Specs (from Jeep 4xe technical docs and nameplate):

Peak power: ~33 kW (≈44 hp)

Peak torque: ~53 Nm

Max speed: ~18 000 rpm

Nominal DC bus: ~355 V (Jeep’s HV pack runs 260–400 V)

3-phase output + liquid cooling + LV connector for resolver/NTC


Used as the P1 machine in the 4xe system (belted to the ICE crankshaft).


Why I think it’s interesting:

Much more powerful than the usual Hyundai/Kia HSG (~8–10 kW) or BMW i8 HSG (~15 kW).

Compact “alternator-style” package, liquid cooled, easy to mount via belt.

Appears regularly on eBay and Mopar parts stores at reasonable cost.


What I’d like help with:

Pinout of the LV connector (resolver and temperature sensor).

Any data on winding resistance/inductance or measured back-EMF constant (Ke).

Best inverter choice: I’m considering a Prius Gen 3 inverter with boost to drive this motor.

Expected electrical frequency at 18k rpm (depends on pole pairs, which I haven’t measured yet).


My idea is to use one of these machines to drive a centrifugal supercharger (for fun). For that I need to know if OpenInverter can handle it reliably and if anyone has already tried working with this Jeep unit.

Any information, tests, or tips would be highly appreciated!
I will receive soon the motor soon.

Thanks in advance.

[P.S.Mangelsdorf]

I started digging up info on these for a tractor project, but didn't actually get my hands on one and start working on it. If I remember correctly, the 3 pin main input is not actually inverter phases - I'll try to find the info I had and post it here later this weekend.

[jrbe]

Did you find if they rated the power at the motor / generator shaft or at the geared down crankshaft? Marketing likes to play with numbers where they can.

[Jacobsmess]

Did you find if they rated the power at the motor / generator shaft or at the geared down crankshaft?

Power and torque are printed on the motor label in the images.

[db4matic]

Hello Everyone,

I have been looking at this Motor-Generator as well for the same reasons as Yuyu29.
I came across this posting while searching for any details on the electrical interface pinouts/wiring etc.
If P.S.Mangelsdorf or anyone else can find anything useful, posting it here would be greatly appreciated.
Here is a link to my project car (1999 Mustang) on EcoModder.com
https://ecomodder.com/forum/emgarage.ph ... cleid=7577

many thanks,
db4matic

[P.S.Mangelsdorf]

If P.S.Mangelsdorf or anyone else can find anything useful, posting it here would be greatly appreciated.

Thanks for the reminder. Here's what I've been able to find; mostly the following 3 links:
https://transistor-man.com/everything_etorque.html
https://endless-sphere.com/sphere/threa ... on.120263/
https://endless-sphere.com/sphere/threa ... as.111146/

From what I have found, there are two different starter/alternators used by Jeep and Ram: one that is used on the V6, and one that is used on the 5.7 Hemi in the Ram. The visual difference is the big flat electronics case on top of the Hemi version. From what I can see, the Hemi version might be easier for a brain board swap, since the electronics are in that separate case, while the more plentiful V6 version has the electronics included in the rear cover of the motor.

Also, from what I can tell, these are the mild hybrid motors. There are more substantial and higher voltage motors used in most (all?) of the 4xe line.

[db4matic]

Hi P.S.Mangelsdorf,

Thank you for the info links!

Yes, it's the newer (2021-24) 4XE 14.5/33 kW version I'm looking at.
I didn't know it was an IPMSM which would be perfect.
I'm hoping it is actually designed with an external controller/inverter so the large 3-prong port would be the 3-phase connection.

I'm going to try to see if I can get hold of the factory wiring diagrams for that year range in the hopes that it would show the LV connector pinout, maybe signal names......

If I find anything useful I will post it here (not holding my breath)!!

David

[P.S.Mangelsdorf]

I'm going to try to see if I can get hold of the factory wiring diagrams for that year range in the hopes that it would show the LV connector pinout, maybe signal names......

If I find anything useful I will post it here (not holding my breath)!!

Hey, if you manage to find a source for current Mopar/Stellantis wiring diagrams, that in and of itself would be a huge help with this and other projects I've been thinking about.

[johu]

Moved to Drivetrains forum. Please put some thought into choosing a matching forum