Chalkalis Gravity Wheel

[lespaul109]

I would like to have those motors for other projects also, but I'm not sure I know what machine they come from. Your motor does have some awesome stats though!

[mscoffman]

No, I have no pics, I have scraped the recorder parts a long time ago.
But I can update you with new fresh motor numbers.
I tested my motor yesterday at 8V to get precise readings.
It uses 4mA at 8V = 32mW, while spinning at 1020 RPM.

0.032W vs 1.8W at no-load.
I do think you need go digging for old recorders and test their motors.
Please have in mind that all motors will use more power at load, aka kicking the pendulum.

Yes...to confirm what you are saying.
Web link picture for recognition only;

http://www.radioshack.com/product/index.jsp?productId=2103597

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Battery Life Spec for Recorder:
Battery Features

Battery Type                     Product    
Chemistry                         Alkaline    
Size                                 C    
Voltage                            1.5 Volts    
Battery Average Run Time    45 HOURS    

These capstan motors often have electrical connections on back
to produce pulses for something called a velocity control servo to
set RPM's to a fixed setpoint.

:S:MarkSCoffman

[lespaul109]

ok, that makes more sense now

thanks a lot

[FatChance!!!]

@lespaul109

What makes sense?
The motor advice or my explanation of no excess energy?

[lespaul109]

The motor advice