OK, so now we have a 'statistically significant' sample of three (
I've commented on how the reduction gear whine can get 'quite loud' in my Fluence, particularly when accelerating in the 40~50 mile range above 20 kW applied power. Do others think this too?
'Quite loud' is, obviously, relative - it's about the same as the pinion whine from the DP0 auto boxes on my other Renault cars, but when there are no other noises such things become more prominent.
The other noise I have slowly 'tuned into' is a motor noise between 20 and 40 mph. When I say 'motor noise', it is, I'm sure, the actual traction motor's rotor turning over. This will be a combination of bearings, inverter/electrical magnetostriction in the coils, and whatever else it is attached to. It sounds to me to simply be the noise of a motor 'doing its thing' at 2 to 5,000 rpm or so, and that's hardly surprising because there's a 70kW motor just in front of me doing just that!! But it does become quite prominent if you are on a quiet road surface, and especially when decelerating (regenerating) as you pass through 30 mph or so.
I don't think there is any issue with the motor, as I can't hear it once over 40 mph. I guess they have tuned the NVH of the motor so that any latent resonances at higher speeds are avoided, or that the road noise, even on quiet tarmac, then exceeds this noise.
I did notice this motor noise when I first drove the car back from the dealer, and wondered what it was then, but didn't really 'hear' it until I listened more carefully to the sounds in the car. It is funny that sometimes until you've heard a noise (amongst other sounds), you don't hear it until you specifically listen out for it again!
Anyhow, can you chaps hear the traction motor spinning around at 20 to 40 mph? It might sound all like road noise when you first try to listen out for it, which is usually louder than that sound unless you are on quiet tarmac.