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A general method for designing low-temperature drift, high-bandwidth, variable-reluctance position sensors

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1 Author(s)
Maresca, R.L. ; Philips Laboratories, Briarcliff Manor

A method was developed to design high-bandwidth single-ended variable-reluctance position sensors with high accuracy and extremely low temperature drift for use in magnetic bearing control systems. The method was used to design a hermetic radial position sensor with a position sensitivity ( {1/L_{0}}{dL/dx} ) of 1 percent/µm over the range of 0-50 µm and a temperature drift ( {1/L_{0}}{dL/dT} ) of less than 0.02 percent/°C over the range of 0-100°C, i.e., less than a 2-µm position error for a temperature variation of 100°C.

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Magnetics, IEEE Transactions on  (Volume:22 ,  Issue: 2 )