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Unread 28-01-2002, 07:52
Ken Leung's Avatar Unsung FIRST Hero
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Post Continue on In depth discussions of motors...

FP motors continue...

About the fisher price gearbox…

Teams found out that the fisher price gear box isn’t really reliable, so they did various modifications to fix it up.
“Our team found that the problem with the Fisher-Price gearbox is not so much that the gears are bad, but that one of them is seated poorly… Once we drilled right through the gearbox to secure the shaft more solidly, the gearbox worked much better.” - ianmackenzie
“The last gear was breaking teeth, and, amazingly, it was on the gear and not the pinion… made an aluminum ring gear and bolted it onto a turned down FP gear.” -Bill Beatty

Also, after a close look in the fisher price gear box this year, someone noticed that the gear box is different, and that the fisher price motor actually spins at 20,000 RPM… So, you should watch out for using fisher price motors from last year as replacement…
“and has a 21T gear on it as opposed to the 16 tooth- the net effect of the higher speed and the larger drive pinion is the higher output speed. The last 2 stages of gearing have been changed as well-“ -EZRrider
“Is it only me who has noticed the final stage of the Chipua drive 'copper' gear will fit perfectly into the FP gear box?” -Dr. Bot
http://www.chiefdelphi.com/forums/sh...&threadid=1630
“after running both sets against each other i have foudn the following
1: there seems to be more torque produced in this years set
2: this years set seems to be more sturdy takes more abuse” -Andrew Dahl
http://www.chiefdelphi.com/forums/sh...&threadid=2131



Johnson electric motor (1) specs-

0.05 N-m stall torque. 12.53 Amp stall current, 28086 RPM free speed (all @ 13.5V).
Which come out to be about 40 Watt Maximum motor power.

Another fine addition to the kit this year… With maximum motor power of 40 Watts, this little guy is even more powerful than a seat motor or a window motor.
http://64.119.166.94/forums/showthre...&threadid=1586

PDF Johnson motor specs:
http://www.chiefdelphi.com/forums/sh...&threadid=1579



Globe motors (2) specs-

Just Motor itself:
0.21 N-m stall torque, 21 Amp stall current. 11,500 RPM free speed, 0.82 Amp free current. (all @ 12V).
Which come out to be about 63 Watt Maximum motor power.

With transmission:
Gear box ratio: 117:1
19 N-m Stall torque, 21 Amp stall current, 100 RPM free speed, 0.82 Amp free current. (all @ 12V).
Which come out to be about 50 Watt Maximum motor power.
http://www.chiefdelphi.com/forums/sh...&threadid=1539

The above specs came from Joe J’s excel sheet of motors specs. There’s a different number on FIRST’s manual for the motor without transmission, it is very possible that the one in manual is a typo. But it shouldn’t matter too much, since most teams use the globe motors with transmission on.
“With the "drive assembly" the no load speed is 87 RPM and the stall torque is 150 In-lb (16.95 N-m). The no load speed without the "drive assembly" is just slightly faster (97 RPM) and the stall torque is much much lower (30 oz-in, or 0.212 N-m).” -patrickrd
http://www.chiefdelphi.com/forums/sh...&threadid=1490


About dimension for the globe motors…

I don’t remember anyone mentioning about dimensions for the globe motors online, and there aren’t any blueprints from FIRST. So, it is very likely that you will have to grab a pair of caliper and measure the globe motor itself for dimension.
http://www.chiefdelphi.com/forums/sh...&threadid=1731



Jideco window motors (2) spec- M6 for tapped holes

Just Motor itself:

9.6N-m +1.8N-m / -1.2N-m stall torque, 24 Amp stall current. 91 RPM free speed, 3 Amp free current. (all @ 14.5V).
8.3N-m +1.5N-m / -1.0N-m stall torque, 21 Amp stall current. 85 RPM free speed, 3 Amp free current. (all @ 13.5V).

Which come out to be about 14 Watt Maximum motor power (@ 12V).
http://www.chiefdelphi.com/forums/sh...&threadid=1799
http://www.chiefdelphi.com/forums/sh...&threadid=1821
There are no track/tape drive for window motors this year… Mainly because it is actually a different window motor. So, you may not reuse the window motors from last year.
http://www.chiefdelphi.com/forums/sh...&threadid=1921
http://www.chiefdelphi.com/forums/sh...&threadid=1987



Belimo torque motor (1) specs

You can find specs for the torque motor at this link:
http://www.belimo.com/mft/ActuatorDe...roduct_ID=4764
http://www.belimo.com/mft/ActuatorSe...es=LM&Spring=0

About wiring the torque motor…
“Cut a PWM cable in two pieces, then use the female end to plug to the torque motor. I believe you plug it into pins 1, 2 and 3, using two of them as positive and negative. There is a drawing of the polarity right above those pins, follow it. ” - Manoel
http://www.chiefdelphi.com/forums/sh...&threadid=1991

Last edited by Ken Leung : 29-01-2002 at 12:20.
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