No torque, cant climb slightest hill, trouble accelerating

[matt]

I have a Magic Pie 3 with a 48v 20ah lifepo4.

When I accelerate from a standstill the motor stutters and becomes very choppy, no torque, hardly able to move me forward. Once I get going its fine though on flat surface, but at the slightest hill it struggles and beings stuttering and cutting out. I can hold back the motor with my hand when starting it. Anyone know how to fix this?

[magicaffair]

Sounds like a dodgy phase connection or a hall sensor issue... Try checking the phase and the hall sensor wiring...  I had the same problem/symptoms with mine, had to take the motor apart and re-solder a faulty phase connection.

If all the phase wiring checks out and it is a Hall sensor issue, a Honeywell ss41 sensor is a cheap  effective replacement part.

[matt]

Are there any guides on how to check those things? I don't really have much experience and just expected to be able to install the kit and use it. Also my Magic Pie was missing a bolt on the casing when I received it, could water have got in and caused this problem?

[matt]

I opened it up and one of the magnets appears to have a chip in the corner where the hall sensors are, could this be causing me trouble?

[magicaffair]

If you have a voltmeter, hold the negative up to the black cable of the five hall sensor cables.... then individually hold the red terminal to each hall sensor wire (green, yellow, blue) one at a time, whilst very SLOWLY turning the motor (by hand)... you should get readings between 0-5v on each colour wire, as you turn the wheel,  for each sensor that is working correctly.