Electric wheelbarrow ecostar lw400 motor hub problem

[Rutistars]

Hello, wondering if anybody here could help me to know what's wrong with the wheelbarrow and if I can fix it somehow. I used it with heavy load and flattish tire on a steep hill and it couldn't make it up a bump as i was also pushing it. it stopped, made a funny sound and since then has lost power. Thank you for any suggestions, rut

 

[fechter]

What happens when you try to run it now? Anything?
Try spinning the wheel both directions by hand. Does it spin freely?
Can you measure the battery voltage?

 

[Rutistars]

Hello,
Thanks fechter for your reply.
Spins freely both ways, don't have a meter to measure battery voltage, am in a remote situation but battery is charged up and didnt give signs i know of low battery before the accident happened.
I ve opened up the wheel, all spins fine but when trying with the wheel on Power cuts on and off and reduced power when it goes.

 

[amberwolf]

battery is charged up and didnt give signs i know of low battery before the accident happened.
I ve opened up the wheel, all spins fine but when trying with the wheel on Power cuts on and off and reduced power when it goes.

If overcurrent from the overload of the problem situation caused damage to the system, it might show these symptoms.

Possible damage could be connector overheating that causes high resistance at the connectors (same can happen at inline fuseholders).

Controller overheating could cause damage to FETs or gate drivers, causing it to drive the motor insufficiently. Solder can melt on shunts or wire connections, causing high resistance and the controller detecting overcurrent when none exists and restricting motor power or shutting it off.

Motor overheating can damage the windings, causing shorts that may only cause issues under higher load conditions or higher throttle use, or all the time. Hall sensors can also be damaged by heat, causing the motor to spin incorrectly under load though it may behave normally when offground sometimes.

Battery overcurrent could damage switches or fuseholders or FETs in the BMS, causing high resistance and excessive voltage drop, which could cause the controller to decrease motor power or shutdown or cut out. Cells could be damaged, causing excessive voltage drop under load, while appearing normal without a load.

 

[Rutistars]

If overcurrent from the overload of the problem situation caused damage to the system, it might show these symptoms.

Possible damage could be connector overheating that causes high resistance at the connectors (same can happen at inline fuseholders).

Controller overheating could cause damage to FETs or gate drivers, causing it to drive the motor insufficiently. Solder can melt on shunts or wire connections, causing high resistance and the controller detecting overcurrent when none exists and restricting motor power or shutting it off.

Motor overheating can damage the windings, causing shorts that may only cause issues under higher load conditions or higher throttle use, or all the time. Hall sensors can also be damaged by heat, causing the motor to spin incorrectly under load though it may behave normally when offground sometimes.

Battery overcurrent could damage switches or fuseholders or FETs in the BMS, causing high resistance and excessive voltage drop, which could cause the controller to decrease motor power or shutdown or cut out. Cells could be damaged, causing excessive voltage drop under load, while appearing normal without a load.

Hello and thank you ,
Many possible reasons...
It is a carbon brush motor would they maybe have been damaged? Can anybody recommend any link how you can open up such a motor. I cannot get into the last part where the connections are.
Thank you

 

[amberwolf]

It is a carbon brush motor would they maybe have been damaged?

sure--brush or commutator damage can happen at high currents. Windings can also be damaged.

A controller failure of a brushed motor usually causes the FETs to fail shorted, which would leave the motor stuck full-on just by having battery connected to it. That's different from the brushless controller damages I listed previously (since you hadn't said, I assumed it was brushless as most motors we've seen for wheelbarrow systems are brushless, as are most other small-system motors).


But since it is a brushed system instead of brushless, that leaves it more likely to be a battery or connection issue.

Can anybody recommend any link how you can open up such a motor. I cannot get into the last part where the connections are.

If you show us clear, well-lit, in-focus images of the motor on all sides, we might be able to see something that will help.

 

[Rutistars]

sure--brush or commutator damage can happen at high currents. Windings can also be damaged.

A controller failure of a brushed motor usually causes the FETs to fail shorted, which would leave the motor stuck full-on just by having battery connected to it. That's different from the brushless controller damages I listed previously (since you hadn't said, I assumed it was brushless as most motors we've seen for wheelbarrow systems are brushless, as are most other small-system motors).


But since it is a brushed system instead of brushless, that leaves it more likely to be a battery or connection issue.


If you show us clear, well-lit, in-focus images of the motor on all sides, we might be able to see something that will help.

 

[amberwolf]

If you say something in your reply instead of just quoting me it would be more useful.

 

[Rutistars]

Thanks for trying to help me understand, I can't get to undo the last bit of the motor to get to the connection, there are no visible screws

 

[Rutistars]

Sorry, real bad internetconnection

If you say something in your reply instead of just quoting me it would be more useful.

 

[amberwolf]

You'll need to show *all* sides of the motor; all the parts that are visible right now, including the ends, axles, shafts, etc, so that we can see all the hardware involved. Only showing the slot that you can see into the insides from doesn't really help, as the hardware that would hold it together would usually be on the outside.

The most likely thing keeping it together would be something on the shafts or axles.

It's also possible it's just bearing friction or magnetic fields from the permanent magnets inside if they're strong enough, but external hardware has to be eliminated first, so you don't break anything in the process of overcoming either of those.

It's even possible that being able to see the whole shape of the motor, plus the markings / names / numbers on it would enable finding a manual for it that would show how to get it apart.