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PICList Thread
'Way of measuring RPM of a small model engine'
2007\04\03@081001 by Dumitru Stama

picon face
Hi Guys,
Is there a way to measure the RPMs of the folowing motor ?
www.sierra.ro/import/motoare/motoare_cu_metanol/pentru_automodele/112000.html
It is a model engine, it has no sparks because it runs on diesel-like
fuel and uses a glow plug.
I bought a small car which has this motor and i was wondering if i can
see its revs in realtime

2007\04\03@083224 by Cristóvão Dalla Costa

picon face
Use a strip of black tape on the axis then a led + photodetector to count
revolutions...

On 4/3/07, Dumitru Stama <spam_OUTspanacTakeThisOuTspamgmail.com> wrote:
>
> Hi Guys,
> Is there a way to measure the RPMs of the folowing motor ?
>
> www.sierra.ro/import/motoare/motoare_cu_metanol/pentru_automodele/112000.html
> It is a model engine, it has no sparks because it runs on diesel-like
> fuel and uses a glow plug.
> I bought a small car which has this motor and i was wondering if i can
> see its revs in realtime
> -

2007\04\03@084256 by Rolf

face picon face
Dumitru Stama wrote:
> Hi Guys,
> Is there a way to measure the RPMs of the folowing motor ?
> www.sierra.ro/import/motoare/motoare_cu_metanol/pentru_automodele/112000.html
> It is a model engine, it has no sparks because it runs on diesel-like
> fuel and uses a glow plug.
> I bought a small car which has this motor and i was wondering if i can
> see its revs in realtime
>  
Probably easiest with a permanent magnet and a hall-effect sensor. Could
also use a Slotted Optical Switch (something like:
http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?Ref=47460&Row=157526&Site=CA)
or one of the others...

Rolf

2007\04\04@025153 by Vasile Surducan

face picon face
On 4/3/07, Dumitru Stama <.....spanacKILLspamspam@spam@gmail.com> wrote:
> Hi Guys,
> Is there a way to measure the RPMs of the folowing motor ?
> www.sierra.ro/import/motoare/motoare_cu_metanol/pentru_automodele/112000.html
> It is a model engine, it has no sparks because it runs on diesel-like
> fuel and uses a glow plug.
> I bought a small car which has this motor and i was wondering if i can
> see its revs in realtime

At 30000 rpm, most of the hall sensors will not be able to follow the speed.
I think one way could be a reflection methode using a laser diode and
a photodiode.
Mybe it works with a IR well  focused LED.
You could try with the optics used on CDROM units. It's a a fine optics there.
The nasty problem will be the dirt on the motor shaft...

2007\04\04@044250 by Tamas Rudnai

face picon face
> At 30000 rpm, most of the hall sensors will not be able to follow the
speed.

That's why I thought is enough to measure a gear wheel or the wheel of the
car itself which spinning in a lower speed and you can calculate the engine
rotation speed by knowing the gear ratio. That acoustic measurement
mentioned by Chris is quite interesting idea though. 30Krpm is 500Hz, right?
The idle speed should be around 2000rpm which is about 33Hz. Quite possible
to measure it by its noise, isn't it?

Tamas


On 4/4/07, Vasile Surducan <piclist9spamKILLspamgmail.com> wrote:
{Quote hidden}

> -

2007\04\04@045722 by peter green

flavicon
face
part 1 1251 bytes content-type:text/plain; (unknown type 8bit not decoded)



> -----Original Message-----
> From: EraseMEpiclist-bouncesspam_OUTspamTakeThisOuTmit.edu [piclist-bouncesspamspam_OUTmit.edu]On
> Behalf Of Tamas Rudnai
> Sent: 04 April 2007 09:43
> To: Microcontroller discussion list - Public.
> Subject: Re: Way of measuring RPM of a small model engine
>
>
> > At 30000 rpm, most of the hall sensors will not be able to follow the
> speed.
>
> That's why I thought is enough to measure a gear wheel or the wheel of the
> car itself which spinning in a lower speed and you can calculate
> the engine
> rotation speed by knowing the gear ratio. That acoustic measurement
> mentioned by Chris is quite interesting idea though. 30Krpm is
> 500Hz, right?
> The idle speed should be around 2000rpm which is about 33Hz.
> Quite possible
> to measure it by its noise, isn't it?
but depending on the design the ammount of the noise that is at the fundamental may vary. If the fundamanetal is too quiet you may have problems with your system reading off a harmonic instead.
--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.446 / Virus Database: 268.18.24/742 - Release Date: 01/04/2007 20:49




part 2 35 bytes content-type:text/plain; charset="us-ascii"
(decoded 7bit)

2007\04\04@051759 by wouter van ooijen

face picon face
> > > At 30000 rpm, most of the hall sensors will not be able to follow
> > > the
> > speed.
> >
> > That's why I thought is enough to measure a gear wheel or
> the wheel of
> > the car itself which spinning in a lower speed and you can
> calculate
> > the engine rotation speed by knowing the gear ratio. That acoustic
> > measurement mentioned by Chris is quite interesting idea though.
> > 30Krpm is 500Hz, right?
> > The idle speed should be around 2000rpm which is about 33Hz.
> > Quite possible
> > to measure it by its noise, isn't it?
> but depending on the design the ammount of the noise that is
> at the fundamental may vary. If the fundamanetal is too quiet
> you may have problems with your system reading off a harmonic instead.

place a small magnet on the axle or wheel, and a coil to pick up the
signal. then proceed as if it were an acoustic signal. for more fun:
join with fellow owners of such gear and try to play Bach.

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu



2007\04\04@130553 by Robert Rolf

picon face


Vasile Surducan wrote:

{Quote hidden}

Radio Control (R/C) modelers measure their RPMs all the time.
Hand held optical devices to measure RPM are readily available for
around $40.00 US from any large hobby supply store.

R



2007\04\04@131508 by Vasile Surducan

face picon face
On 4/4/07, wouter van ooijen <KILLspamwouterKILLspamspamvoti.nl> wrote:
{Quote hidden}

= proximity sensor

it's still a huge problem adding a magnet on a 30.000 rot/min shaft....
Bach is a little boy, the assemby will play the Flight of the Bumble
Bee by Rimsky Korsakof

2007\04\04@162033 by Al Shinn

picon face
Try a microphone. Of course your sound card can "listen" to such.
--

Looking forward,
Al Shinn



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