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# Speed Sensor

- To: "'FEMM@yahoogroups.com'" <FEMM@yahoogroups.com>
- Subject: Speed Sensor
- From: "Earanky, Vijay (GEAE, Unison-JAX)" <Vijay.Earanky@unison.ae.ge.com>
- Date: Tue, 27 May 2003 11:46:42 -0400

    David,

    I want to simulate a speed sensor using FEMM. I am new to this program and
    its capability. I will describe the problem briefly here. I have a permanent
    magnet and attached to it is a core (1010 steel). There are 5000 turns of
    wire on it. At the end of the core/coil assembly, there is a gear wheel of
    ferrous material. As the wheel rotates it creates flux in the coil and hence
    an emf generated of ac voltage. Now I want to develop a model to see the
    relationship between no of turns, core material, the air gap (between gear
    tooth and core) and magnet strength. The idea is to get a linear curve
    between the speed and the induced voltage. Can the FEMM model this and if so
    can someone show a direction. Thanks in advance.

    Vijay

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