DWG22 Motor noise

[Bogmonster666]

Sounds like an intermittent metallic grating noise as well as the whine or did I image that or was that noise something unrelated altogether?

The noise is at 10 seconds and 48 seconds for example.

 

[Steve J H]

the noise comes from the friction of the 4 ballbearings around the motor's axle.
As the load increases, the friction increases so does the noise.
Without a load reference, I could not make any deduction whether your ballbearings are shot or not. When Andy comes back from holiday, I will ask him to open up the motor you sent back and check the state of the ball bearings.
Motors like the DWG22C need a new set of bearings after about 3,000-4,000 miles, not 100 miles.

Thanks

I had a listen to your audio file and the characteristics of the noise are very similar to my own two motors. What is more difficult to judge remotely is the volume level. I find my motors to be very quiet - not silent, but perfectly acceptable. The problem is that my definition of 'quiet' might be your deafening roar!

By way of illustration, I'd say the noise of the motor is at a similar level (or slightly louder) than the 'thrum' of a smooth tread road tyre and certainly less than that of a knobby tread mountain bike tyre when used on tarmac. I have Schwalbe Marathon Plus tyres on my bikes and they roll fairly smoothly and quietly.

Woosh - interesting to know about potential bearing replacement. I've got 2.5k miles on the tandem wheel and it has no untoward noises or any sign of play in the bearings. The bearings themselves look a lot more substantial than ordinary freehub bearings too. I'm very much a fair weather cyclist these days though, so my bikes are not subject to all weather use.

 

[Steve J H]

Thanks

I know noise is very subjective and personal perception varies. All I can measure it against are my other bikes and builds, Bafang BBS01, ancient High mileage Yosepower & Fiido DS4 (unbranded Chinese motor). All these are near silent in comparison. Woosh will look into the issue and I will keep you posted on the outcome.

 

[Woosh]

Woosh - interesting to know about potential bearing replacement. I've got 2.5k miles on the tandem wheel and it has no untoward noises or any sign of play in the bearings. The bearings themselves look a lot more substantial than ordinary freehub bearings too. I'm very much a fair weather cyclist these days though, so my bikes are not subject to all weather use.

I will take a look and let you know the part numbers when Andy opens Steve's returned motor.

 

[Bogmonster666]

@Steve J H - Did you ever get to the bottom of the noise?

 

[Steve J H]

@Steve J H - Did you ever get to the bottom of the noise?

Hi
No not yet, Tony at Woosh suspects bearing noise and was going to get Andy to open up the returned motor when back from holiday. Noise aside a very good ride, impressive torque. I was thinking of upgrading the display to enable fine tuning of assist levels as the noise is proportionate to controller output.