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# Contactless magnetic torsion transducer.

- To: <femm@egroups.com>
- Subject: Contactless magnetic torsion transducer.
- From: "Wouter" <wouter.termote@pandora.be>
- Date: Mon, 29 May 2000 21:08:36 +0200
- Disposition-notification-to: "Wouter" <wouter.termote@pandora.be>

    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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