It was inspired by my Z4 conversion.
Maybe you know that K11" 250V only handles 210A continuous at 250V.
This was irritating me a lot so we made this motor that is something like 50-53kW/230V/5600rpm/90Nm continuous. For overload purposes one can use a 250-288V battery so rpm stay high under overload conditions.
I was also unhappy with the standard shaft mounted fans as ventilation was rpm dependent. I.E. if you have 1/3 of nominal rpm, your ventilation is like 3 times weaker. Further the standard fans tend to make lots of whining noise at 4000+ rpm. So we re-introduced the specially shaped back flange that you see on the picture to allow forced air cooling to pump more air through the motor.
As this back flange makes it impossible to use it for mounting, we added machined platforms with threads in the motor case so one can hang the motor on those - there are 4 platforms/8 threads in total.
The motor can also come with an SKF sensor bearing producing 80 pulses per revolution - it is automotive class (used in car ABS systems) and is extremely reliable and maintenance free (unfortunately Soliton/Zilla cannot read it