Eric,
I should have been more clear.
The ringing or singing noise is definitely coming from the motor, not the controller. But James suggested that the noise is a result of the controller not being the optimum match for the motor, and the motor is "acting like a speaker" to radiate the sound. This noise is present even when the motor is operated out of the boat.
I wasn't surprised to hear a high pitched whine coming from the controller whenever the contactor is energized, but the noise (only at certain speeds)is something I'd like to reduce as much as possible.
I have de-coupled the motor mount from engine stringers with rubber mounts, about the loudest mechanical noise (other than the growl at low speeds) is the normal motor operation and the synchronous belt going around. And that doesn't irritate me.
So maybe a correctly configured Gen4 is an improvemnet...
-Tom
--- In electricboats@yahoogroups.com, "Eric" <ewdysar@...> wrote:
>
> Tom,
>
> I haven't heard anything from the Gen4 controller. As far as I can tell, it is truly silent. My experience with DC controllers in EVs is that some will "whine" at certain settings, I think that it's some sort of harmonic related to PWM or something like that. That noise comes from the controller itself. There may be other mechanical harmonics that show up as motor noise. They may be related to motor mount plates or other physical pieces. These will occur when a minor vibration falls in synch with a piece's natural resonance (like your tires on certain sections of highway) and each pulse is perfectly timed to push the resonance farther, making any noise louder. Usually, a slight change in system speed will break the cycle. The other option is to add a flexible mount or pad to de-couple the vibration source from the "sound board" component.
>
> On my boat, the low-speed growl (very noticable) is the only noise that I didn't expect. I knew that the motor wouldn't be silent, the noise during normal operation is reasonable to me. Once I get the whole installation (wiring, additional components, etc.) locked down, I may try to mitigate some of the mechanical noise that I get today.
>
> Fair winds,
> Eric
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