EDDY CURRENT SENSOR AND TURBO CHARGER ROTATION DETECTING DEVICE USING SAME

摘要

[Problem] An object of the present invention is to provide an eddy current sensor that is capable of accurately detecting the number of revolutions of a turbocharger with an inexpensive and compact construction and without driving up the manufacturing cost and simultaneously provide a turbocharger rotation detection apparatus using the same. [Means for solving the problem] The present invention is an eddy current sensor that forms a resonance circuit comprised of a coil disposed proximal to a target and a capacitor and measures a displacement based on a change in voltage generated by a relative movement between the target and the coil, formed by winding the coil on a columnar ferrite core, further, the present invention equips a compressor of a turbocharger with the eddy current sensor and detects the number of revolutions of the turbocharger.