Subject:
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Re: 8475 -- motors and steering Oh My
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Newsgroups:
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lugnet.org.ca.rtltoronto
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Date:
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Mon, 30 Dec 2002 05:32:49 GMT
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Viewed:
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1730 times
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On Sun, 29 Dec 2002 18:32:24 GMT, Chris Magno <cmagno@rogers.com>
wrote:
> > It is indeed PWM. I got out my oscilliscope and checked it, and here are
> > the results I got:
> >
> > At setting 1 (closest to off):
> > Th: 1ms
> > Tl: 2ms
> > Tt: 3ms
> > 9Vpp
> >
> > At setting 2:
> > Th: 2ms
> > Tl: 1ms
> > Tt: 3ms
> > 9Vpp
> >
> > And at full on, it's just 9v DC.
>
>
> cool. Thanks Trevyn.
>
> now if only I had an O-scope and knew what Th, T1, and Tt meant??
Th - Time signal is High
Tl - Time signal is Low
Tt - total time
------________
Th Tl
<---- Tt -------->
Matthias Jetleb
P.S.: Th/Tt is defined as the duty cycle, expressed as a percent.
Therefor: Th=2ms, Tt=3ms = 66% duty cycle. This is generally more
meaningful since the average power delivered is the same as it would
be if Th=4ms and Tt=6ms. If Tt gets to be too high (ie. low frequency)
then the motor starts to hum loudly. If Tt gets to be too low, then
the inductive reactance of the motor windings increases, lowering the
overall efficiency.
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Message has 1 Reply:
 | | Re: 8475 -- motors and steering Oh My
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| Still no baby..... (...) umm, thanks Matt.... but I did put in the winky face after my last statement.... and since you did bring it up my DMM does do true RMS. that's why I have never felt the need for an o-scope. my electronics projects just don't (...) (22 years ago, 31-Dec-02, to lugnet.org.ca.rtltoronto)
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