Re: [EVDL] New Netgain 9" Impulse Comutator Whine - Noise
Or maybe a mounting bolt is touching a fan blade? With my ImPulse9, I had to use a few washers on my adapter to keep the bolts from bottoming out on the stationary fins.
Hopefully I am just reading your description incorrectly. Generally ticking in the motor is a bad noise indicating a damaged comm. This type of damage is usually caused by running the motor at too high of RPM. One time for a very short period is enough to do the damage. Is it possible you did this at anytime? Anything above 5000 rpms on your motor could possibly cause this kind of damage. Are you sure the noise is coming from the motor and not something else in the drivetrain? Is it possible the noise is being electronically generated and your motor is just acting as the speaker? If you turn the motor manually say by leaving the vehicle in gear and rolling does it still tick?
I whine is a common noise to come from the motor. The whine is usually generated by the motor controller and amplified through the motor.
> From: email@example.com
> To: firstname.lastname@example.org
> Date: Mon, 3 Aug 2009 22:03:31 +0100
> Subject: [EVDL] New Netgain 9" Impulse Comutator Whine - Noise
> Deal List,
> Having recently got my converted van on the road (at last) using a new
> Netgain 9" Impulse motor I find the noise from the comutator brushes a bit
> distracting. At very low RPM you can hear the 'tick tick ticking' as the
> brushes hit the gaps between the comutator segments. At high rpms (over
> 1000 or so) the ticking becomes a whine whose frequency (obviously) varies
> with rpm. It is not a huge issue but I am wondering if a) this is normal
> with new motors and b) will it get quieter as the brushes bed in?
> The other, related question I have at this stage of the game (180 miles or
> so on the clock) is brush arcing. How the dickens do you know if you have
> the brush timing advance right - mount a camera looking at the armature and
> go for a spin? Not very practical.
> Regards, Martin Winlow, Herts, UK
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