[Cyborg] motor specs

Rachel McConnell rachel at xtreme.com
Tue Mar 24 06:50:14 UTC 2009

Lamont is doing some work on PWM-ing them.  It may in fact be better to
do it that way but it's useful to have the specs either way.


Mike Ashmore wrote:
> ... though it occurs to me now, we might find it better to drive the
> motors with the full 3V they're rated for, and vary the duty cycle over
> which we drive 'em. PWM-style. That seems like it should handle the
> "start from stuck" issue we were seeing at low voltages. Might also make
> the design more adaptable to different types of motors (single sources
> bad, or so I hear), say if we were to make an instructable.
> Just a thought.
> -Mike
> On Mar 23, 2009, at 9:52 PM, Mikolaj Habryn wrote:
>> I'll bring a VPM2 tomorrow to add to the list. Rather frustratingly, I
>> can't find my bag of them, so have only a couple that were rattling
>> around loose. Because I'm lazy, I'd rather use these than build a hard
>> shell around a pager motor with an exposed eccentric, so I'm inclined
>> to buy another 10 or 20 from solarbotics (at $3.50 each, sigh - if
>> people have already worked out how to convert one of the other motors
>> into a form that can be embedded between two layers of fabric, I'd
>> love to be talked out of this).
>> m.
>> On Sun, Mar 22, 2009 at 4:13 PM, Rachel McConnell <rachel at xtreme.com>
>> wrote:
>>> Mike and I just spent some time testing out the specs for the 3 kinds of
>>> pager motors we currently have.  Here's a Google spreadsheet of the data
>>> we got:
>>> http://spreadsheets.google.com/ccc?key=p--xq5BkJD5E_DTRwEdLcEA&hl=en
>>> There's a really nice power supply up here in the electronics lab that
>>> we used to get these numbers.  Let's run each motor we get through it
>>> just for comparison; it takes about 2 minutes per motor.
>>> I'll post this link plus pictures of the motors in question on the wiki
>>> shortly.
>>> Rachel
>>> _______________________________________________
>>> Cyborg mailing list
>>> Cyborg at lists.noisebridge.net
>>> https://www.noisebridge.net/mailman/listinfo/cyborg
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> Mike Ashmore
> motomike at gmail.com

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