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In lugnet.robotics, Mark Riley writes:
> I hope this isn't old news - at least I couldn't find any mention
> of it here, so...
>
> While rummaging through a new copy of the Ultimate Builders
> Set (#3800), I noticed that the 9V mini-motor that came with
> the set was somewhat different than ones I've encountered
> before. Normally, when I get a new one of these motors,
> I twirl the shaft with my fingers to hear that nice purring gear
> box sound they tend to make. Well, to my surprise, this
> one made a lot of noise. Not only that, but when I let go
> of the shaft after giving it a twirl, it only continued to rotate
> for about 2 seconds (as opposed to the 5 seconds or so for
> a normal motor). I thought "Darn, I got a bad motor!".
>
> However, after looking at this new motor for a while and
> comparing its operation to a "normal" motor, I noticed that
> indeed there were cosmetic differences as well. And, the
> number on the bottom of the motor in question was different
> than all the other motors in my collection (i.e. new motor =
> 43362, old motors = 71427). Here's an image of the
> differences I found between the two versions:
>
> http://home.surewest.net/markril/Lego/motors.jpg
>
> Oh, one more thing - while writing this I noticed that the
> new motor is definitely lighter (i.e. less mass) than normal
> motors.
>
> What's funny is that this is the second copy of set 3800
> I've acquired. The first set must have shipped with the
> normal version of the motor, because all my other motors
> are of the 71427 variety.
>
> Now, up to this point I've tried to be objective about this
> new motor. But, since the new version makes more noise
> and doesn't rotate as freely, I'm led to believe that this
> might be a cost cutting move on Lego's part. That, or I
> really do have a bad motor and it's just a coincidence
> that it happens to be the new version.
>
> So, does anybody else have one of these new motors?
> And, how does its operation compare to the others you
> have?
>
> Mark
Yes, there now seems to be at least TWO different versions of the 5225 9V Gear
reduced motor. On the motor bases there is a number '71427' and in the bottom
left corner there is a number '1' on the older version. The new version has
'43362' and in the corner a '2' and above the '2' the is a smaller 'R2' in
italics. Note- these are on the motors I have but there may be differences on
other motors.
The new motor is lighter, noisier and doesn't free spin as long as the older
model.
Just in a basic test of direct connecting an old style to a new style motor
(using one as a generator and one as a motor). You get different results
turning the old style to power the new than the other way around. I don't know
if this is the gearing difference or one is generating less power. A one
revolution turn gives different results from old to new and then new to old.
The internal construction is different. When you pop off the back. The brushes
are connected to the back panel. (In comparing this with some other faulty
motors I just pulled apart I found there were two slightly different designs of
the older style as well. The number on the bottom is the same but is is a
different point size !?! The internal moulding in one is black and the other
white.) (pps. I just found one with the same old number but had '-002' after it
but the '2' was mirrored?!?)
There is a difference in the weight. The old style had a metal casing around
the internals. The new style has a plastic internal casing. I remember seeing a
posting where someone had found that the magnet was losing filings and that
had caused the motor to seize. Maybe in the plastic it is more contained ?!?
The old style gear ratio is 10 - 43 - 12 -37
The new style gears are 10 - 44 - 11- 35
I am petty sure these figures are correct. I was going cross eyed counting but
doubled checked the counts and they seem correct.
Sorry this is so Q&D. If I can grab a digital camera I'll post some pics.
Regards,
Bernard
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Message is in Reply To:
 | | New Version of 9V Geared Motor
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| I hope this isn't old news - at least I couldn't find any mention of it here, so... While rummaging through a new copy of the Ultimate Builders Set (#3800), I noticed that the 9V mini-motor that came with the set was somewhat different than ones (...) (22 years ago, 15-Oct-02, to lugnet.robotics, lugnet.technic)
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