Noisy hub motor

[mr watts]

Hi, hope someone can help.
I was running my 36v 250w geared rear hub motor with a locked clutch and sensorless dual voltage controller without any problems, however I decided to overvolt to 48v for a Little more power.
Unfortunately it now hammers and knocks on acceleration.
The motor looks fine with no shorts and everything checks out OK.
The controller has no shorting or blown mosfets and seems fine.
I can't find any bad connections but I may solder them all to be sure.
I've tried another throttle, same result.
The battery is fully charged at around 54v.
Any help appreciated.

 

[Nealh]

Unfortunately it now hammers and knocks on acceleration.

Sounds like phase/issue what controller make ?

 

[vfr400]

Maybe if you tell us what you have, somebody might be able to help.

 

[mr watts]

Sounds like phase/issue what controller make ?

It's a generic Chinese one 36/48v worked fine on 36v.

 

[Nealh]

Just re -read a locked clutch, in what way, how?

 

[mr watts]

Just re -read a locked clutch, in what way, how?

I had it mig welded at work to override the freewheel and run it sensorless. Its been fine so far.

 

[vfr400]

Aikema motors don't like to run sensorless, especially with high power. What's happened to the hall sensors?

 

[mr watts]

Aikema motors don't like to run sensorless, especially with high power. What's happened to the hall sensors?

Hi, the motor is a dapu it originally had a torque sensor (three thin wires and 3 phase wires)
I'm only using the phase wires and running sensorless.
It runs fine on 36v so perhaps it's simply the higher power as you say.
The acid test is to revert back to 36v, I suppose.