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Unread 18-01-2005, 13:51
DGiandomenico DGiandomenico is offline
Mentor Elec & Cntrl Sys
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Re: 2005 FP Pinion

Here are a couple measurements on our 2005 Fisher Price Motor

13 teeth; 1/2" O.D. pinion

Part ID# 74550-0642
Code: TD034701


Measured RPM*:
24,500 @ ~12V (voltage approx)
12,000RPM @ 6.0V
-11,600RPM @ -6.0V (reverse direction)
* Measured using R/C airplane hobby tach & transparent disc w/stripe


Motor Resistance**:
0.069 - 0.074 ohms

**Measured with 10A current source; 4 point measurement of 0.69-0.74 V while turning rotor between fingers

Calculated stall current from above:
162 - 173A (12V/0.069ohms; 12V/0.074ohms)


All these measurements agree well enough by those provided by Paul Copiola at

http://www.chiefdelphi.com/forums/sh...ad.php?t=32442

-David
 


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