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Unusual Motor Behavior- Who has seen this???

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Unusual Motor Behavior- Who has seen this???

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Old 01-09-19, 09:20 AM
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Robert62
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Unusual Motor Behavior- Who has seen this???

I just finished setting up my 3rd ebike and I am having a problem. I purchased a 48v Luna shark pack and I have paired it with a Chinese 1000w non-geared hub motor. It is throttle only with no PAS. It has an LCD control.
The issue is intermittent glitch in the power while riding. I say glitch because it is more like a bump and not a pure loss of power. It seems like one set of coils gets out of phase for a split second and causes the motor to jolt. I have already ruled out the battery since I get the same intermittent problem with a different battery. I believe it is a loose connection, interference between cables, or a bad hall sensor. I have checked all the connections visually. I am sure it is not the main power connector. I can rule out the brake cutoff since that behaves differently (smooth cut in power.) That leave me with the LDC display control, the throttle cable or the hall cables/sensors.
Given all this info, which of those is the most likely culprit? Which would be the most sensitive to inductive interference? This may be a tough nut to crack and I am hoping someone has seen this exact issue before.
Many thanks,
Robert
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Old 01-11-19, 12:03 AM
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Firedog91902
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Intermittent problems suck. You got 4 major components: battery, motor, controller and display. You eliminated the battery. Do you have access to working units of the other 3? Swap them out, one at a time. If you are using the brake wiring unplug it to be sure a switch isn't flakey. I doubt inductive interference is the problem. More likely a bad or melted connection going on & off as the bike vibrates. Good luck.
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Old 01-11-19, 08:40 PM
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Robert62
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Thanks man!
R
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Old 01-12-19, 09:25 PM
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Leckiebikie
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I get a similar problem, and have eliminated just about everything apart from the battery, I think.
It seems to mostly occur when the battery is down a bit, never on a full charge. My battery is pretty old but still comes up to virtually the same reading as when new. Its a 36v and on a full charge it is floating on the charger at 42.3v. (Used to float at 42.6). However when it drops when used to about 35.8v its about then I get the dead spot. On the controller thats one bar down. If I turn off the charger and turn it back on again, I can usually get another 20kms or so out of it before another restart is necessary. A local battery 'expert' reckons the battery has a faulty cell.
Batteries here in NZ are about $800 so am putting up with the problem until I cant, then I guess Ill bite the bullet, buy a new battery and hope that solves the problem but am still getting 40-50kms on a full charge and as I rarely need to do that am living with it.
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