Originally Posted by WheelMotor
When I said in 2008 that I could make this WM for 1500$ I forgot to look in my crystal boll, otherwise I had invested all my money in Neodyum. In which case I had multiplied my wealth with 10 !!!!!
While we are asking quotes for the more than 50 magnets we need in 1 motor, I am smashed with prices close to 1000$ only for the magnets !!!
*sigh* i could have said "i told you so" but that would also have needed me to have a crystal ball. i did however suspect that something like this would happen, but actually hearing from someone who has direct first-hand experience, it is quite an eye-opener.
so i have instead been designing vehicles that require only about 6-8kW sustained and about 12-15kW peak... and *not* in-wheel. would you be interested to see if you can build an LRK Torque-Max "outrunner" with that kind of rated and max performance? the LRK Torque-Max design is what PML FlightLink copied (they still make them custom, to order, to military and aerospace specs).
the efficiency and power of the LRK Torque-Max design is so significantly higher than that of a standard motor that when PML Flightlink initially came out with their datasheets before they had even made the motors, they didn't believe the numbers and quoted "85%" efficiency in the calculations. after actually testing them they had to hurriedly revise those numbers upwards by a big margin: the 7kW hub motor became an 11kW etc.
so there are advantages to doing "outrunners" but those advantages are *not* because they're suitable for use as in-wheel motors, they're because the efficiency and torque characteristics are better.