From the Hyperion hall sensor thread:-
gwhy! is experiencing similar problems, using 6 FET keywin controllers.fitek wrote:
...the external mounting works. Motor runs fine at low speed. The system does cut out at high throttle. You have to put the throttle back down to zero and then bring it back up..
I have seen this problem using a 12 FET keywin controller on my Stinky, but only when drawing battery current greater than 80 amps.
Also, when I changed to use the internal hall sensors, the problem went away.
I am not sure what causes the controller to cut out like this, but I have a hunch it is to do with noise, (or spurious spikes) on the hall sensor inputs to the controller.
Here are a couple of ideas:
1) It may be that noise is being induced in the sensor wires when they run too close to the phase wires or the battery wires.
2) It may be that the hall sensors are being triggered at the wrong time by the magnetic field generated by the stator currents.
1) is easy to fix by re-routing or screening the sensor wires.
2) is perhaps not quite so easy. The sensors would need to be moved to a position that was less affected by the stator field, but still maintain the correct timing.
It may turn out that the 17.14 degree spacing is more susceptable to stator fields, because the sensors are positioned more in line with the poles of the stator.
Any theories or empirical findings gratefuly received.