Author Topic: No torque, cant climb slightest hill, trouble accelerating  (Read 3935 times)

Offline matt

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No torque, cant climb slightest hill, trouble accelerating
« on: September 15, 2012, 01:48:47 AM »
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?

Offline magicaffair

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Re: No torque, cant climb slightest hill, trouble accelerating
« Reply #1 on: September 17, 2012, 07:17:47 PM »
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.
« Last Edit: September 17, 2012, 07:23:49 PM by magicaffair »

Offline matt

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Re: No torque, cant climb slightest hill, trouble accelerating
« Reply #2 on: September 17, 2012, 08:41:05 PM »
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?

Offline matt

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Re: No torque, cant climb slightest hill, trouble accelerating
« Reply #3 on: September 17, 2012, 09:15:18 PM »
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?

Offline magicaffair

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Re: No torque, cant climb slightest hill, trouble accelerating
« Reply #4 on: September 17, 2012, 10:18:19 PM »
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.