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# Re: [femm] Contactless magnetic torsion transducer.

- To: <femm@egroups.com>
- Subject: Re: [femm] Contactless magnetic torsion transducer.
- From: "Wouter" <wouter.termote@pandora.be>
- Date: Tue, 30 May 2000 21:13:39 +0200
- Disposition-notification-to: "Wouter" <wouter.termote@pandora.be>
- References: <NDBBLMCJKLJMKGPONOMCMENGCAAA.ja-rabchuk@wiu.edu>

    Thank you for the information.

    In our case, we can't place a magnetoelastic ring around the axe because the
    machine to study is working right now. With our old model we used the
    magnetic elastic carecteristics of the steel itself, so we can put our
    device without any preparation on an axe of a turning alternator of the
    iregular axe of a diesel.

    Thanks anyway because in many cases we can use the new Magna-Lastic Devices.

    Wouter

    ----- Original Message -----
    From: "James Rabchuk" <ja-rabchuk@wiu.edu>
    To: <femm@egroups.com>
    Sent: Tuesday, May 30, 2000 4:33 PM
    Subject: RE: [femm] Contactless magnetic torsion transducer.

    > 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@pandora.be]
    > Sent: Monday, May 29, 2000 2:09 PM
    > To: femm@egroups.com
    > 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.
    >
    >
    >
    >
    > ------------------------------------------------------------------------
    > Missing old school friends? Find them here:
    > http://click.egroups.com/1/4055/2/_/5054/_/959627398/
    > ------------------------------------------------------------------------
    >
    >
    >
    > ------------------------------------------------------------------------
    > Failed tests, classes skipped, forgotten locker combinations.
    > Remember the good 'ol days
    > http://click.egroups.com/1/4053/2/_/5054/_/959697276/
    > ------------------------------------------------------------------------
    >
    >
    >

- References:
  - RE: [femm] Contactless magnetic torsion transducer.
    - From: "James Rabchuk" <ja-rabchuk@wiu.edu>

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