[TT-Man]

Hi e*clipse, thanks for the info posted on the Toyota MGR.
I also several years ago bought an MGR unit, thinking all the same thoughts.
I wanted to convert a small car to a local runabout.
Then started discovering the limitations.
EV's need continuous power ratings.
I thought Toyota MGs would be conservatively rated ..... seemingly not.
The 50kW rating on the MGR seems to be 18 seconds.
Logical for acceleration 0 to 60 mph so to speak.

A continuous or RMS value may not even be half at 25 kW. That might have been OK, until you find that the power available .... apparently .... is not a linear relationship to voltage. Seemingly, the motor is a combination permanent magnet and reluctance motor, all designed about the 650v applied.

I have wondered about rewinding or cutting the windings mid-point to parallel, messy.
And splitting the star point to make a delta conversion will not work.

However, I have an alternative, split the star point. bring out the 3 connections, then run a second switching inverter to effectively parallel the 2 active windings. This inveror at the star point would be slave to the main inverter.

The perceived benefit would then allow the battery voltage to be a more accepable 325 volts maintaining the original performance of the MGR.

So 18 seconds acceleration with High low end torque, and for me 25 kW continuous running power.

I may draw up my proposition and post.

The hard bit making a master and slave invertor!!

Cheers,
TT-Man