Re: Lineary actuator - direct drive

On Fri, 14 Mar 2008 08:30:09 -0700 (PDT), Asbjørn
<s973402@xxxxxxxxxxxxxx> wrote:

On 14 Mar., 16:23, "Dave" <D...@xxxxxxxx> wrote:
"Asbjørn" <s973...@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:

|  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)?!

No one knows how it works, it's all magic!!

And I vote for you leaving this group....

He who posts from googlegroups should watch his language or risk
permanent termination.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

America: Land of the Free, Because of the Brave
.

Relevant Pages

  • Re: 6 "piece" PUs
    ... >> induce a current in the other... ... >> will induce a current with that frequency into the coil? ... >> both then add the signals together on the output. ... It's a great idea that uses micro neodymium magnets ...
    (rec.music.makers.builders)
  • Re: 6 "piece" PUs
    ... > induce a current in the other... ... > will induce a current with that frequency into the coil? ... > both then add the signals together on the output. ... The main variables have to do with the flux density of the magnets ...
    (rec.music.makers.builders)
  • Re: Lineary actuator - direct drive
    ... pitch (I can hardly imagine the coil being 3 times magnet lenght, ... I think you have gotten the relative spacing of coils and magnets a little wrong. ... The cycle of magnetic poles (the length between similar points in the repeating pattern of a pair of magnets and the spaces between them) must match the cycle of coils. ...
    (sci.electronics.design)
  • Re: Paging the old ignition gurus (long).
    ... other coils so not directly affected by the rotor magnets. ... parallel to the trigger coil). ... I would hazard a guess that the range of what is needed as a trigger ... I think I understand the other single coil feeds the capacitor ...
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  • Lineary actuator - direct drive
    ... Faulhabers Quickshaft are all based on a arrangement of magnets inside ... a rod around a coil with phases U,V,W: ... pitch (I can hardly imagine the coil being 3 times magnet lenght, ...
    (sci.electronics.design)