Subject:
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3V motors
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 5 Aug 1997 14:17:47 GMT
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Original-From:
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David.J.Dostal@lawrence.%stopspammers%edu
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Viewed:
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1260 times
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Mike,
I had a similar problem and the solution is not to put a resistor in
series with the motors. With the varying amount of current a motor
draws, the voltage drop across the resistor will vary as well and the motors
will not see a consistent 3V. Rather, a cheap way to accomplish this is by
stringing diodes in series with the motor. Diodes have a (mostly) constant
voltage drop across them, and enough of them in series with the motor will
shave off 6V. If you want your motor to be bidirectional, then you need two
diode arrays in parallel with opposing "pass" directions. Did that make sense?
This is the easiest and cheapest way to regulate voltage, but it still has the
problem of eating battery power. I'm not sure if there is any easy way around
that.
Dave
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Message has 1 Reply:
 | | Re: 3V motors
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| I too had a problem with 3 volt motors. The issue is the height of the PWM output. If you drive your motor function at 50%, then 50% of 9.6V is still much higher than the 3 VDC for full speed. One way to get some resolution is to modify the supply (...) (27 years ago, 6-Aug-97, to lugnet.robotics.handyboard)
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