Broken Hub motor?

[Dutch_Schaefer]

Hi all

I have been using an eBike for about 18 months now, unfortunately I had a minor crash (no injuries!) recently, the bike slid on it's side and took a bit of a scrape, though there is no obvious signs of damage, there was no power to the motor afterwards, it did brifely begin to work again for a few miles then went dead again and since then other than the odd brief sign of life has remained dead.

It is a goldenmotor rear hub motor, there is no signs of cable damage and all connections seem good, the battery is putting out 58v as per normal, is it a case of 'replace the motor' or is it worth trying anything else?.

Thanks

 

[AHicks]

Sounds to me like it's time to drag out a multimeter and start tracking down the power. Start at the battery. If that has power, check to see if it's making it to the controller, etc.

I doubt seriously the motor went bad after a minor accident. They're pretty sturdy. A bad connection somewhere much more likely.

 

[amberwolf]

the bike slid on it's side and took a bit of a scrape, though there is no obvious signs of damage, there was no power to the motor afterwards,

Almost certainly either

a connector is loose, or a contact (or wire) has pulled a bit out of a plug, or been bent so it doesn't make good contact,

or

there is damage at the axle wires, right where they go into the axle. This happens a lot when bikes crash on that side, so if yours did that, you could have wires that were pinched together, breaking their insulation in a way that you can only see when they're bent back the same way again, that allowed them to short together.

Sometimes that damages the controller, someitmes not.


Very very rarely, a side impact can knock a hall sensor out of it's slot in the stator inside the motor, but this doesnt' stop the motor from working at all, it just makes it unable to take a load well, or gets "grindy", etc. If yours doens't work at all, that's not what's wrong.



If the controller itself was impacted or shocked, it could've broken parts off isnide it (like capacitors) and if they shorted to other things, it can blow the controller up.


If the throttle hit the ground, it can be broken (magnets knocked loose, wires broken off inside, etc).

 

[TommyCat]

Model of motor and display type if any would be helpful for troubleshooting.

 

[Dutch_Schaefer]

Thanks for the replies, it is a golden motor magic pie 5, the battery is putting out the correct voltage, I have also tested the battery plugged in to the holder (but not the motor) and that connection is fine too, the battery charge indicator next to the throttle is lit up so I guess that means it's ok.

I believe the controller is built-in next to the motor unit so possibly something has gone wrong there?.

 

[TommyCat]

The lit throttle LEDs do indeed indicate that full battery voltage is getting to the throttle. If the harness cables look absolutely pristine. (no scrapes, pulls, or pinches) I'd start with something simple like disconnecting both brake connectors just in case one got damaged. ( a jammed on switch would keep the motor from running...)
Another would be to check that the cable end terminations on the circled cables below are secure and intact.

Lastly for now with the battery connected, use the pin-out diagram and check for 5 vdc regulated controller power at the most convenient 5vdc location... (brake, PAS, throttle, ETC. )


Regards,
T.C.