RE: [femm] Contactless magnetic torsion transducer.

["James Rabchuk" <ja-rabchuk@xxxxxxx>]

Wouter,

there is a company, called Magna-Lastic Devices, Inc. (used to be
MagnetoElastic Devices, Inc.), in West Central Illinois in the US, which is
producing torque transducers for a number of applications. They have
several patents. You might want to contact them if you are looking for more
information. The developer of the device has written several papers in the
journal of applied Physics. His name is Ivan Garshelis.

Jim Rabchuk

-----Original Message-----
From: Wouter [mailto:wouter.termote@xxxxxxxxxx]
Sent: Monday, May 29, 2000 2:09 PM
To: femm@xxxxxxxxxxx
Subject: [femm] Contactless magnetic torsion transducer.


Dear members,

Who would like to study or simulate a contactless torsion transducer?

At work we are looking for such transducer, there is a smal market but there
are no producers. Long ago (1980) we made one ourselves with the first Intel
signal processor. It was used for studying torsion and metal fatigue during
a real short-circuit test in one of our powerplants in Belgium (300 MW)
Times are changed and we have no more time to develop such transducers
anymore. It could be a hint of a researcher looking for new ideas.

Principle: magnetic resistance is changed during torque on a 45 degrees
angle.
Test stand: Fixed tube with long bar to set a torque on the tube with a
diameter of 20 inch.
Our construction was a central winding generating a fluctuating magnetic
field. (~1kHz)
Four windings are placed at 45 degrees around the first and are so wired
they form a bridge and compensate an other.
When the magnetic resistance is changed by torque there is an inbalance and
the voltage on leaving the bridge is increasing in amplitude.
Difficulty: It is very sensitive to changing airgap due to vibration of the
turning axe.

Maybe it can help someone to do a study about this idea (for university or
to start a new business)
Little remark: others have done this also but for I now with older
technologies and using no simulators.


Wouter.




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