Motor suddenly sounds like a turbine!

[MrSkinnyLegs]

Hello, few bits of info.

1000w 48V voilamart controller, 13A 48V battery, motor supposed to hold up to 1000w.
The motor was quiet and responsive.

I changed the controller two weeks ago. Was working like a charm, yesterday had a joy ride for 20miles, all was good.

Today i started pedaling and it sounded at begining like it was griding... In a way disk brakes grind when stopping with completely finished pads ( metal to metal ).
I had to be places so i continued. After i reach approz 10km/h speed it changes to a sound of a car turbine if that makes sense.

Power wise it still has it, but it is scary to think of what might happen when going on trails 50km/h.

I have no display, pedal sensor and a throttle which i use only to start ( 1 pedal rotation ).

What are worst case scenarios if i keep riding it? Will hub just stop working? Will it blow? The new controller does not heat up at all, unless i go on hilly trails for very extended times.

 

[vfr400]

The fact that the noise has changed points to a magnet come loose and is rubbing on the rotor, or you somehow got a piece of debris stuck between the rotor and stator. I'm thinking more likely the latter. When they assemble the motors, it's possible to chip a magnet. I wouldn't do anything just yet. If it's debris, the noise will gradually improve and then go away. If it's a loose magnet, it'll probably stay the same for quite a long time, in which case, you need to open the motor to see how bad it is. You only need to take either of the side-plates off to see inside the motor. That's not at all difficult to do.

 

[MrSkinnyLegs]

The fact that the noise has changed points to a magnet come loose and is rubbing on the rotor, or you somehow got a piece of debris stuck between the rotor and stator. I'm thinking more likely the latter. When they assemble the motors, it's possible to chip a magnet. I wouldn't do anything just yet. If it's debris, the noise will gradually improve and then go away. If it's a loose magnet, it'll probably stay the same for quite a long time, in which case, you need to open the motor to see how bad it is. You only need to take either of the side-plates off to see inside the motor. That's not at all difficult to do.

I do not go wet, so debris would be quite difficult. Specially because yesterday my joy ride involved only tarmac.

The motor has about 6000 miles. Think that can be the reason?

 

[vfr400]

I do not go wet, so debris would be quite difficult. Specially because yesterday my joy ride involved only tarmac.

The motor has about 6000 miles. Think that can be the reason?

OK, with that mileage, more likely a magnet come loose, but could be anything that got dislodged. The only way to know for sure is to look inside and solve the mystery.

 

[MrSkinnyLegs]

If anyone is interested, i read somewhere that loose cabling could be a problem. So i checked inside my pouch. The red cable from motors small 6pin connection felt a bit loose so i pushed it back in. I also checked the green/blue/yellow cable, pushed them as much as possible.

Somehow the noise stopped. Will see if it is permanent.