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 05:25:55 GMT
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Viewed:
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1266 times
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> Darn it... why did I have to go and loan my multimeter to me dad. I
> want to put a DM meter on this and see what volts I get.
It doesn't matter. DMM's are not good at measuring pulsed signals.
(unless you have one of the more expensive true-RMS meters which can
calculate the average of a non-sinusoidal waveform. You really need an
oscilloscope for this.
> Trevyn... do this and let me know. I'm curious if its PWM or just a
> lower voltage.
It will be PWM. It's actually easier to implement. Trying to create a
voltage drop, particularly if driving motors or other high-current
devices, produces a lot of wasted heat. PWM is far more energy
efficient. Obviously something that's particularly important in a
battery operated device.
Matthias Jetleb
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Message is in Reply To:
 | | 8475 -- motors and steering Oh My
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| (...) Yes I was testing on an unloaded 9V geared motor. Thats how my RPM-o-Meter works best. (...) I just re-did this test and you are correct. when you load a geared motor (i put a 40t gear on the motor and put friction on the teeth) then you can (...) (21 years ago, 28-Dec-02, to lugnet.org.ca.rtltoronto)
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