Subject:
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Re: Has Anyone Tried This and Will it Work?
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Newsgroups:
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lugnet.trains
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Date:
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Sat, 13 Jun 2009 07:08:09 GMT
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Viewed:
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16935 times
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In lugnet.trains, Clifton D. Chambers wrote:
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In lugnet.trains, Dave Sterling wrote:
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In lugnet.trains, Clifton D. Chambers wrote:
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The below information was posted on the WAMALTC site. I know the new motors
run on a 7.4V as opposed to 9V, but can this work? Ben, I am hoping you can
provide some insight.
Has anybody tried to use the new motor with an old motor where they powered
the new 8866 motor FROM the old motor, getting power from the tracks?
As you cannot get the old motors anymore, it seems like one way to keep
going with old trains, or to get the better torque, would be to wire the new
motor to the old motor using the accessory connection from the old motor.
But if the two motors run at different speeds, does that put undue stress on
them?
I suppose you could open the old motor, disable the motor connection and
gears, and just use it as a free-rolling truck with electric pickup. That
sounds destructive, but if I have a motor that is burned out it seems like a
good use of it (unless someone knows of a good supplier for the old electric
motors used in the old train motor).
Clifton
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Interesting idea, Clifton. I would be very interested to see if this works
and if it is ‘safe’ for the motors. One thing to keep in mind though is that
9V motor failure tends to be more tied to the internal power leads that
connect the wheels to the motor breaking than actual motor failure. As such,
is the main advantage here allowing you to replace one 9V motor with a PF
motor on trains that require more than one motor?
Hopefully someone can offer some insight on the feasibility/reliability of
this setup.
-Dave
ToT-LUG
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I think the real intent was not so much installing a second motor, but
actually powering the PF motor, or even a second PF motor from the 9V rail.
Using the 9V truck to pick up power from the track and using the 8886
extension wire to convert the connection and supply power to the PF motor. I
am hoping one of our engineering inclined AFOL(s) will either determine that
this can’t work based on some violation of EE principals or they are inspired
to accept the challenge and show us how this can work. I have a few motors
that are candidates for such an experiment.
We ran three windmills off a 9V transformer at the B & O Show without a
problem. Both of my windmills based on the VESTAS contained PF motors. I am
not sure about Bob’s windmill, but the three were connected to the 9V
transformer and ran without a problem.
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The “new 8866 motor” is just the same motor as found in 9v RC trains that have
been out for a year or so. It SHOULD be capable of being powered as you suggest,
9v jumper wire to a 9v track powered motor (but I haven’t tried so no promises).
I presume Lego plans on exploiting the old style 9v connector on the bottom of
the PF connector wires to also connect to this motor from a PF battery box in
forthcoming trains.
No idea if the battery and track powered train motors run at the same speed.
Given the $50 PF train battery that is a little too wide to fit in six wide hood
units, it would be nice if someone came up with a power pickup truck for those
of us with 9v layouts (ah well, dead motors will likely be the common solution).
Another reply mentioned the need for conversion, etc. PF has four wires, two are
like before (and are available on the bottom side of the 9v converter in the PF
conversion wire). To go forward, one is positive the other negative. Reverse
direction and the polarity is swapped. The other two wires have fixed polarity
to power the IR receiver (maybe other components too, e.g., maybe the WeDo
sensors). Here’s a thread with more info,
http://news.lugnet.com/technic/?n=15935
Here’s a gallery of various components wired together. Only the 9v battery box
powering the IR receiver has an “X”, i.e., doesn’t work, because the IR receiver
ignores the input from the two leads that go to the 9v battery box.
http://www.brickshelf.com/cgi-bin/gallery.cgi?f=297859
Here’s more info on PF
http://www.philohome.com/pf/pf.htm
and lego motors in general
http://www.philohome.com/motors/motorcomp.htm
Interestingly, the new rechargeable battery has a dial to control motor speed
directly if you do not want to use IR. But if you power a motor via an IR
receiver to the new rechargeable battery, the motor completely ignores whatever
setting the rechargeable battery is at. So the IR tower only uses the fixed
polarity lines to power subsequent devices. Which makes sense, since the IR
receiver controls the direction. But it also allows you to have a third,
constant speed device powered off of the same battery.
Perhaps a nudge to Philo asking him to characterize the RC motor would be good.
He plots all of the motors up to 9v, some up to 12v.
Benn
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Message is in Reply To:
 | | Re: Has Anyone Tried This and Will it Work?
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| (...) I think the real intent was not so much installing a second motor, but actually powering the PF motor, or even a second PF motor from the 9V rail. Using the 9V truck to pick up power from the track and using the 8886 extension wire to convert (...) (15 years ago, 11-Jun-09, to lugnet.trains)
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