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Unread 01-10-2005, 09:32 AM
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THE Fisher-Price Motor Spec Sheet

Attached is the original motor spec sheet from Mabuchi for the Fisher-Price motors. Notice that Mabuchi also supplied a separate motor. The spec sheet attached is for the motor that is attached to the gearbox. The spec is for the motor only. This is the chart I sent to FIRST in December.

There are two sheets in this file: one for 6 volts and one for 12 volts. This motor was optimized for the 6 volt ride on car, but can be used at 12 volts.

-Paul
Attached Files
File Type: xls Mabuchi RS-550PF-8021 (74550-0642).xls (55.5 KB, 1451 views)
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Unread 01-10-2005, 09:38 AM
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Re: THE Fisher-Price Motor Spec Sheet

Quote:
Originally Posted by Paul Copioli
Attached is the original motor spec sheet from Mabuchi for the Fisher-Price motors. Notice that Mabuchi also supplied a separate motor. The spec sheet attached is for the motor that is attached to the gearbox. The spec is for the motor only. This is the chart I sent to FIRST in December.

There are two sheets in this file: one for 6 volts and one for 12 volts. This motor was optimized for the 6 volt ride on car, but can be used at 12 volts.

-Paul
Thanks for posting this Paul, but for some reason I can't open it. I just get a garbled file. Sorry about being a pain in the butt

-Bill
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Unread 01-10-2005, 09:41 AM
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Re: THE Fisher-Price Motor Spec Sheet

Quote:
Originally Posted by Bill Gold
Thanks for posting this Paul, but for some reason I can't open it. I just get a garbled file. Sorry about being a pain in the butt

-Bill
Right Click 'Save Target As...' For some reason, it does that with all *.xls files.
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Unread 01-10-2005, 09:43 AM
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Re: THE Fisher-Price Motor Spec Sheet

Quote:
Originally Posted by Joshua May
Right Click 'Save Target As...' For some reason, it does that with all *.xls files.
Gar. I'm a tard... This is what I get for checking robotics stuff before my 8am class... Why am I not a morning person?

Thanks Josh!

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Unread 01-10-2005, 10:52 AM
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Re: THE Fisher-Price Motor Spec Sheet

So from this data, it looks like we can't really use the motor below about 2/3 free speed or it will draw way too much current and burn something (itself, fuse, etc) very quickly.
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Unread 01-10-2005, 08:01 PM
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Re: THE Fisher-Price Motor Spec Sheet

Paul, et al,

How certain are you of this F-P spec?

PEAK POWER: 400+ Watts!

Whoa... ...that's a lot of power. That means that the F-P motors are easily the most powerful motors in the kit. The Chiaphua's (a.k.a. CIM's) are something like 300-350W as I recall.

For those who do not have experience, if you are planning on using anything close to that amount of power, you had better be sure to leave the vents on the front end of the motor open to breath. There is a lot of heat to get out of a small space. Even with the 150W motors from prior years (again from memory not from specs), we used to melt the fans off the armatures. I think we had 200+W motors in 2002 but nothing like this.

Interesting. What was the spec last year -- my memory fades.

FYI PEAK POWER in Watts = (FreeSpeed in RPM) * (Stall Torque in N-m) / 38

This is a useful figure of merit for motor power -- the 1/38 comes from the fact that the peak power happens at 1/2 the stall torque and 1/2 the free speed and that RPM to Radians/Sec ~ 1/10

On another note, the Dewalt whitepaper (see plug below) that explains how to use the F-P motor in a Dewalt Transmission, does not open up these holes. It is possible, even without a mill to leave these holes open. If you are going to drive with a F-P motor, you should definitely open the holes*.

Joe J.

*they are already open on the standard transmission, I really mean this as a note to those who are planning on making your own transmission for these motors -- it make a huge difference the cooling of your motor -- don't be fooled by folks who put fins on the outside of the motor can. While this can be good to improve the amount of power you can put in these motors for long periods of time, FIRST matches are not "long" in heat transfer terms. To give you a perspective: A curling iron is typically 20W. At stall, you are pounding 150Amps at 12V -- that is 1800W of power -- we are talking blowdryer's here. There is just NO WAY you are going to conduct that amount of heat way with fins on the outside of a motor can. You need AIR FLOW to carry that heat away. While I am at it, once you get to stall, there is no way you are going to even blow that much heat away because a stalled motor is not blowing any air!

One final thing, don't tell me that the 40A breaker is going to save you either. This as been discussed 10s fo times on this sight - search "40A breaker trip time" (in fact I just did and there was a lot of talk of burning up F-P motors -- checkit out). You will discover that the 40A breaker can conduct 2 and 3 times their rated current for significant periods of time before they open.
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Last edited by Joe Johnson : 01-10-2005 at 08:32 PM.
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Unread 01-10-2005, 08:17 PM
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Re: THE Fisher-Price Motor Spec Sheet

Something isn't right here. Maybe that's why FIRST hasn't put it out yet?

I think mabuchi has done a mistake (It can't be be Paul's fault ;D)
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Unread 01-10-2005, 08:36 PM
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Re: THE Fisher-Price Motor Spec Sheet

Quote:
Originally Posted by Matt Attallah
Something isn't right here. Maybe that's why FIRST hasn't put it out yet?

I think mabuchi has done a mistake (It can't be be Paul's fault ;D)
I think the mistake is not Pauls or Mabuchi's but F-P's

If the motor is supposed to be used on a 6V car, then it is not unreasonable -- 100*W's is about right -- still high but not too bad. 400W is INSANE in that size motor.

Joe J.

*I don't have the spec open right now, I am going by the theoretical idea that peak power grows like the square of the voltage. So, 1/2 the volts implies 1/4 the peak power.
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Unread 01-11-2005, 12:41 PM
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Re: THE Fisher-Price Motor Spec Sheet

All,

When my contact first told me about it being a six volt motor I was a bit disappointed, but I asked him a few questions. Disregard his question to me in the quote below. The Excel grid I attached in my previous post does have the data for 6 volts, too. That data is on another tab in Excel. I can test one of the motors I have and see what it can do, but I bet limiting the voltage to the FP motor is probably a good idea. The thing that bothers me the most is the engineer from Mabuchi did not jump up and down and say, "No way! Do not use it at 12 volts or you will destroy the motor." In my experience, however, the motor will fry near stall conditions at 12 volts. I am confident that the information I have received is accurate, but the missing piece is the robustness at 12 volts.

-Paul

Quote:
Paul,

It was nice speaking with you earlier today and Mabuchi Motor is pleased to
support programs which challenge the young minds of tomorrow's work force.

I had an applications engineer, Mr. Dustin Ridgeway, pull off the
performance curves from our data base on the
PF # 74550-0642 , motor RS555PF-8021 you requested. Per our discussions,
the motor is basically a 6.0 V nominal motor
as compared to the 12.0 V RS555PF-6534 you are accustom to.

It can be operated upwards to 9.6 V and for short time duration 12.0 V may
be acceptable.
Can you downgrade the battery to 6.0 V ??

If you have any further questions, please feel free to contact us for
assistance.
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Unread 01-11-2005, 12:54 PM
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Re: THE Fisher-Price Motor Spec Sheet

Quote:
Originally Posted by Paul Copioli
All,

The thing that bothers me the most is the engineer from Mabuchi did not jump up and down and say, "No way! Do not use it at 12 volts or you will destroy the motor." In my experience, however, the motor will fry near stall conditions at 12 volts.

-Paul
Mabuchi motors that we have used have also fried near stall conditions. We have not limited the voltage on them, in years past. They definitely don't like to be stalled when full power is being asked for. They tend to give up and let out their white smoke.

So... what we will probably do is run this thing at a maximum of 9.6 volts, as the engineer from Mabuchi suggested. At this stepped-down voltage, we will see these numbers:

2005 Fisher-Price at 9.6 volts
free speed: 19,200 rpm
max power: 325 Watts
stall torque: .518 N-m

Looking at these numbers, at this lower voltage, this motor is less powerful than the 2003-04 drill motor (free speed 19,670, 448 Watts, 0.87 Nm stall torque). It is strikingly similar to the 2002 drill motor (20,000 rpm, 340 watts, 0.65 Nm)

Does this seem reasonable?

Andy B.

Last edited by Andy Baker : 01-11-2005 at 01:01 PM.
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Unread 01-11-2005, 02:21 PM
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Re: THE Fisher-Price Motor Spec Sheet

I think there is a better way than to arbitrarily limit the voltage to the motor.

If Mabuchi says 12V is okay, I believe what they are saying is that the armature can stand the 24,000 RPM without "bird caging"*

Given that, I think what is really needed is a way to prevent the build up of heat inside the motor. This can be done more elegantly than simply to limit the voltage of the motor (which is to restrictive at times and not restrictive enough at others).

Here is what I propose to those who want to get the most out of this motor:
1) measure or infer current (you know voltage in from PWM and if you are driving with it, you know the RPM -- that gives you a good method to calculate current).
2) given current and voltage, you can calculate electrical power input and the efficiency of the motor at that speed/load/voltage point
3) given power input and effeciency you can determine how much heat you are generating at that moment in time
4) given the heat input at any moment in time, you know how much energy is put into the system and (assuming initial conditions and the heat out is proportial to the temp of the motor) you can do a basic energy balance calculation temp over time.
5) if you want to get fancy you can even incorporate a motor speed based cooling factor for the motor (faster speed -> more cooling).
6) after the temp rises above a certain number, THEN and only then, I would limit POWER INPUT to the amount that I can dissipate at the current speed

Note that #6 in effect is done by limiting voltage, but the difference is important. You are only limiting voltage when needed and then only by the amount needed to keep the temperature from further.

In theory, this is a pretty easy thing to do. In fact, because temperature is a slow process I think you can do this calculation 3 or 5 times per second and still get good data.

Has anyone implemented a current limit based on such ideas? To be honest we have talked about it for 2-3 years now. We never implemented it mostly because we haven't used the F-P for a drive system in a while.

Any volunteers to share their experience or to take on this subject in a whitepaper?

Joe J.

*where the windings cannot stand the centrifuge effect and they mechanically disconnect from the armature, forming a kind of bird cage.
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Last edited by Joe Johnson : 01-11-2005 at 02:36 PM.
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Unread 01-12-2005, 11:46 PM
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Re: THE Fisher-Price Motor Spec Sheet

side-note:

what is the reduction with the gearbox. i don't have one to look, is it similar to boxes we've had previously? does anyone know for sure what it is? thanks.
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Unread 01-12-2005, 11:54 PM
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Re: THE Fisher-Price Motor Spec Sheet

It's a 124:1 reduction. Basic info on the motors in the KOP this year can be found in guidelines_c.pdf off of the FIRST website (look under documents and updates and you should find it. It should be in the robot section if my memory serves me correctly).
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Unread 01-13-2005, 05:34 AM
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Re: THE Fisher-Price Motor Spec Sheet

Quote:
Originally Posted by ShadowKnight
It's a 124:1 reduction. Basic info on the motors in the KOP this year can be found in guidelines_c.pdf off of the FIRST website (look under documents and updates and you should find it. It should be in the robot section if my memory serves me correctly).
I'd take your gearboxes apart and count the number of teeth on each stage. If we are really getting varied pinnion sizes between teams there may be other variations as well.


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Unread 01-13-2005, 06:40 AM
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Re: THE Fisher-Price Motor Spec Sheet

Yes, I had neglected to consider that. Hmm, well, that is what the current documentation states, though it appears it could be incorrect.
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