Joe90 wrote:I am contemplating using them on a car conversion
2 x hubmonster geared around 3:1 to front wheels
4 adaptto emax
car all up weight 2300lb with everything including the passenger
Car uses around 11kw @ 100km/h
What are your toughts ?
Sorry for the late reply. That sure sounds like an interesting project. Is your vehicle really that efficient through the air? Your first issue is voltage and finding controllers to handle it. If you find some at a reasonable price, please let me know. What kind of top speed were you shooting for, so I can get an idea of the wheel size, which is part of gearing.
The next thing to look at is heat dissipation. Will the motors be shielded enough to ventilate, which will permit significantly higher current limits and much better performance. If they need to stay sealed, then you'll need to get good airflow to them, and that will give you better cooling than when I ran mine in stock form in-wheel. You'll need somewhat better cooling due to the increased iron core losses of higher rpm even though at 2300rpm which yours could see at top speed cruise those losses would be under 500W, the iron core losses mine saw at my max rpm of 1150rpm on 74V nominal were only about 150W.
If you plan to gear for 100-105kph as a top speed, and you can really do that voltage, then sure a pair of HubMonsters would be up to the task even in stock form, since each of the motors would see about the same load I was running on my bike back when I ran mine stock. The max current you can run will be dependent on terrain, but flattish up to somewhat hilly should still allow 100A battery side from each controller. That's 400A total, so a total of 63kw peak input. With ventilation like I use, you can bump that up conservatively by 25-30% and still have much cooler running motors.
Note that these are all solid conservative estimates. While I haven't run that voltage myself, I have run that current and higher on my daily rider, and current is where the heat comes from.
I need more info to really determine if it's a good match. If you don't have a controller solution at 158V nominal, then I can fix you up quite economically at 111-118V nominal, though with your load you'd need to gear to a top speed in the 80-90kph range...maybe more if you have flat to flattish terrain.