Re: Lineary actuator - direct drive


"Asbjørn" <s973402@xxxxxxxxxxxxxx> wrote in message
news:ce782143-32ed-47c9-addb-3310ede80f01@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
The actuators like Copley Controls ServoTube, Parkers Powerrod and
Faulhabers Quickshaft are all based on a arrangement of magnets inside
a rod around a coil with phases U,V,W:

| U | V | W |
|S-N| |N-S| |S-N| |N-S| |S-N|--------> Force
| U | V | W |

(alse U, V and W can be staked on top of each other

Does anyone knows the relationship between coli length and magnetic
pitch (I can hardly imagine the coil being 3 times magnet lenght, som
it seems so).

Is it possible driving a constant force in any position - imagine:

That would be a voice coil actuator with position sensing. force is related
to current. I guess you could use a load cell to sense force against an
object.

Bob

| U | V | W |
N| |N-S| |S-N| |N-S| |S-N|----->(|HEAVYLOAD|)
| U | V | W |

Does anyone know the dimensions or how the principles work (is it
standard AC motor drive with 120 degrees lack)?!

Best Regards

Asbjørn




.

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