Teams in DC are wondering what the Fisher Price motors are for.
Whatever you decide to use them for, as long as you keep it legal. (The same is true for any motor in the kit. Just make sure you do the math to get the right one.)
I’d use them for anything but drivetrain
I second that one. We have used them for the drive train before but you have to watch their temperature it is very easy to over heat them and have them motors melt down. These motors have about half the torque that the little CIM has but they are still very powerful for their size.
The original use of the FP motors are for a child’s motorized toy. What you will use it for is up to you.
As noted above, these are fan cooled motors and will rapidly (2 or 3 seconds) overheat and burn if stalled. This is because the fan is stopped and the internal losses are large in a stall condition…
Best of luck…
Unless something has changed this year, (sorry, haven’t checked the spec sheets) the power of the CIM and the FP are only separated by a few watts.
The biggest problem with FP’s is that you can’t really load them till they’re close to stall, or they will smoke. You must design in a few hundred to thousand safety RPM to keep them cool.
Last year’s FPs were 6V units running at 12V. So they were a heck of a lot more powerful. This year’s FPs are true 12V units. Peak Power is about 170W. Pay no attention to the guidelines document, it’s listing the power input at Peak Power. About half of which the motor is just turning into heat.
Does anyone have hard numbers on the new motors yet?
All the motor specs are on FIRSTs website.
Thanks, Kirk. I was looking for the tech information that they mentioned on the kick-off Webcast that was being worked out by 35 teams.
Just a quick question are we allowed to use last years 6 volt fischer prices? I really loved their insane amount of power. Not that I think we need it per se this year, but a flywheeel hooked up to one could really… fly!
The FP’s thrive in conditions that require the high power in a small space and high RPM’s.
They are good for things like running a ball roller system, where you need the high RPM and you can keep it running at that speed. It’s also helpful that they have far and away the greatest power the weight/size ratio of any motor in the kit so packaging them is easier.
In fact, anytime you need to keep something spinning at a fairly consistent (high) speed is a possible FP use. It’s not that a CIM motor can’t do it, but they are probably better placed on a drive train or arm which will require more slow speed high torque operation.
According to the rules the only FPs you can’t use are '03 and '02. It doesn’t say a thing about the '05 one.
Even with the andymark planetary transmissions? They gear them to be just lik a CIM so the only difference is s few watts right?
sigh… We’re working on it. It’s been hard to shake loose the resources needed to build a dynamometer with the range to characterize all of the motors, but we’re almost there. The design is not as trivial as it seems.
Take a look in the National Instruments and DAQ forums for the latest news.
The FPs could be used for drivetrain, just I wouldn’t recommend that they are the only motors in the drivtrain. If you couple their power with those from the CIM or CIM “Mini-bikes” you could produce quite a powerful drivetrain.
It’s more than just a few watts, the CIM is 337 Watts at max Power and the FP is 172 Watts a Max Power. But with the AM Planetary or other form a gearing, you can match their output speeds. The question is really if 2 CIMs per transmisison is neccessary for this year, perhaps 1 CIM and 1 FP is enough, or even 1 CIM and 1 miniBike motor (270 Watts Max, and there’s an AndyMark adapter for those now too!)?
Consider these threads that are related to how to use FP motors:
Low Cost Planetary Gearbox Source…](http://www.chiefdelphi.com/forums/showthread.php?t=41335)
Man, I’m a handsome devil, aren’t I?
Actually, you can’t use any Fisher-Price motor, unless you know it to be the exact same type. (The same goes for all motors, so that they can be classified as spares.) The 2002 and 2003 motors are definitely different from the ones in the 2006 kit, but I’m pretty sure that the 2004 and 2005 motors are also of different specifications, and therefore not allowed. It’s a simple matter to check the old spec. sheets; if the model number doesn’t match, you’d better ask FIRST if they’d care to issue an update allowing you to use them.
ok back in 04’ I believe some teams modified the fp to speed them up. Would anyone be willing to point me in the right direction? I have searched the old docs but with no luck.