METHOD OF INSPECTING PERMANENT MAGNET ENCODER AND INSPECTION DEVICE

PROBLEM TO BE SOLVED: To provide a method of inspecting a permanent magnet encoder surely preventing an output signal of a sensor 5a for inspection from varying owing to a difference between the geometric center of an encoder 4a and a rotation center, and being applicable to inspection although the encoder 4a has a tubular shape with its outer circumferential surface used as a detected surface. SOLUTION: The sensor 5a is held in a holder 16 and this holder 16 is fit in a cylinder hole 15 of a support 14. An end face of the holder 16 is elastically pressed on the outer circumferential surface of the encoder 4a by an elastic member 17. Even in the case where the encoder 4a eccentrically moves as shown in Figs. (A) and (B) owing to the difference between the two centers, the holder 16 follows the circumferential surface of the encoder 4a. As a result, the distance is kept constant between the circumferential surface which is the detected surface and the sensor 5a. COPYRIGHT: (C)2011,JPO&INPIT