I have peaked 75 amps through the pie, climbed a 16% mountain last Saturday and burned the hall sensors, but the motor survived which is incredible.
These are not the hills most people will encounter on a daily basis and the pie won't do those kind of hills on normal GM controllers, but most motors will burn at high power up such hills, or mountains. I was pumping 3kw in the pie for the last 2 miles, I started on a grade so steep it was very hard to get going because the front wheel kept rising! I cheated and drove the car up to the car park at the transmitter access road and used the pie for the last 2 miles because the gate is locked and I can't cycle up, without power!
Running 16S LiPo 60 volts it will do 32 mph max on level ground, using an Infineon adjusted to 40 amps battery and 75 amps phase.
It can take much more, this pie can take a lot of power, I estimate 5-7 kw peaks no problem!
You see once up to speed it takes around 1200 watts to maintain 32 mph that's about 20 amps on 60 volts. On 48 volts it was around 750-900 watts. But that was at 35 mph max.
If your voltage is high enough, that's is the only way it will draw more watts in general, so having a very high current set up is of no use if the pie has not got the voltage to allow it to get to speed where it will want more current to maintain more speed, more current will allow you to accelerate faster of course!
Some motors are wound more for higher speed and will draw more watts at higher speeds but will have a lot less torque, the pie is a slow motor but given 60 volts and a 40+ amp controller it will change your E-Biking experience forever at 32 mph. The acceleration is fantastic, and it will climb most hills with great ease!
The problem with the pie burning the hall sensors was the fact the motor was bogging down and couldn't spin fast enough where it's most efficient, so most of the energy was turning to heat, this is the trick with most motors that are being ran at a lot higher than rated power.
a bogging down of any motor under load will probably burn soon enough so this is the most important thing to remember!
I would love to see GM install a temperature sensor!
Sorry if I was rambling too much!
