The design of magnetic circuit for magnetostrictive sensor

Hiroshi Matsumoto
System Research Group Fundamental Technology Research Div. YAMAHA MOTOR CO., LTD.


The torque sensor is a physical sensor using the inverse magnetostrictive effects that the ferromagnetic alloy has, and it is used for the leg-power detection of electric-assisted bicycles or the steering torque detection of the electric powered steering systems.
The specification of the magnetic circuit comprised of exciting coils, a back yoke and so on is important to design the high sensitive and robust magnetostrictive sensors.
In this article, a process to determine the optimum specifications based on the analysis results of JMAG-Designer will be shown.

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