Motor making grinding noise when riding.

[wasem.roshde.gara]

Hello
I have a weird issue,
I bought a 5k watt hub motor and a controller from aliexpress, the install was easy and the spin test was great with no load, when the wheel is off the ground the motor sound fine and the speed on the display look ok too.

But when i took the bike for a test run the motor was making grinding noises and the display did not read any speed 0 km/h all the ride.

I noticed after a minute that the cables of the motor are really hot for the touch.

So i turn it off and pedaled the way back.

Any ideas any one?

Motor hub 5000w 60v72v
Controller 5000w 48v- 72v
Battery 60v 50a

 

[nicobie]

I think that either your hall or phase wires are connected wrong.

 

[E-HP]

In case you need a reference (by TommyCat):

Testing BLDC motor's Phase Wiring - Hall Sensors and Wiring. - Electricbike.com Ebike Forum

Testing electrical components of a typical hub motor with a digital multi meter. First take a few minuets and look over the wiring going into the motor for cuts, scrapes, missing insulation and other wiring issues or poor connections that should be resolved first. Smell for evidence of...

electricbike.com

check the flow chart a third of the way down the page

 

[wasem.roshde.gara]

I think that either your hall or phase wires are connected wrong.

I followed tommycat guide, i also tried all 6 combinations and 3 makes the motor stuck 2 make it grind badly and only one is running smoothly (testing with no load wheels off ground).

 

[wasem.roshde.gara]

In case you need a reference (by TommyCat):

Testing BLDC motor's Phase Wiring - Hall Sensors and Wiring. - Electricbike.com Ebike Forum

Testing electrical components of a typical hub motor with a digital multi meter. First take a few minuets and look over the wiring going into the motor for cuts, scrapes, missing insulation and other wiring issues or poor connections that should be resolved first. Smell for evidence of...

electricbike.com

check the flow chart a third of the way down the page

I followed tommycat guide, i also tried all 6 combinations and 3 makes the motor stuck 2 make it grind badly and only one is running smoothly (testing with no load wheels off ground).

 

[E-HP]

Are you using a molex connector for the halls? If the speed stopped registering, then continuity to one of the halls may be intermittent, and sometimes the pins backout from the connector if they aren’t snapped into the housing fully.