[NSRCA-discussion] beep tones

[Scott Pavlock]

That is how all of the manufacturers do it. Next time you plug a pack in,
spin the motor by hand as the arming tones sound. You will notice that most
motors will change pitch and volume as it passes through the arcs of
different phases.

On smaller outrunners, you can actually see the prop twitch when the motor
beeps. And depending on the quality of magnets, inductance of the motor,
etc, different motors will sound at different volumes.
On Oct 9, 2011 2:20 PM, "Lightfoot" <lightfoot at sc.rr.com> wrote:

> You may be right. Time for some experiments.****
>
> **1)      **Different size motors – same ESC****
>
> **2)      **No motor at all****
>
> **3)      **Same motor – different ESCs****
>
> **4)      **And most likely to succeed - write the mfgs.****
>
> ** **
>
> *Jay Marshall* ****
>
> *From:* nsrca-discussion-bounces at lists.nsrca.org [mailto:
> nsrca-discussion-bounces at lists.nsrca.org] *On Behalf Of *Scott Pavlock
> *Sent:* Sunday, October 09, 2011 2:03 PM
> *To:* General pattern discussion
> *Subject:* Re: [NSRCA-discussion] beep tones****
>
> ** **
>
> Yes it is in fact pulsing current through the motor. An electric motor is
> very similar to a speaker, and vibrating the windings at specific
> frequencies will create different musical tones.****
>
> On Oct 9, 2011 1:04 PM, "George Kennie" <geobet4evr at gmail.com> wrote:****
>
> I have a question that came up at ther flying field yesterday.****
>
> The query was: What produces the arming tone and the cell count tones that
> are ****
>
> audible when the battery is plugged in to an electric motor powered model?
> ****
>
>  ****
>
> There were guys that were adament that the tones were produced by the
> current****
>
> surging through the motor.****
>
>  ****
>
> There was confusion due to the fact that no visible speaker could be
> observed.****
>
>  ****
>
> I felt that there had to be nano oscillator circuits in the esc working
> some kind of a****
>
> nano piezo circuit generating the required tones, but I really had no idea.
> ****
>
>  ****
>
> Can somebody please clear up the confusion, ? anybody,? Peter???****
>
>  ****
>
> Thanks ****
>
>  ****
>
> Georgie  ****
>
>
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> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion****
>
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