| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotation detecting device which is noise resistant and can accurately detect an absolute angle even during high-speed rotation, and a bearing having the rotation detecting device mounted thereon. SOLUTION: The rotation detecting device 1 includes a plurality of magnetic encoders 2A and 2B arranged in concentric ring shapes and having differing numbers of magnetic poles, and a plurality of magnetic sensors 3A and 3B which detect the magnetic fields of the magnetic encoders 2A and 2B, respectively. The magnetic sensors 3A and 3B have a function of detecting the information of the position of each of the magnetic encoders 2A and 2B in the magnetic pole and are composed of sensor elements and phase detecting means 13A and 13B which obtain phases based on magnetic field signals detected by the sensor elements and output the phases as ABZ phase signals. The rotation detecting device also includes a phase difference detecting means 6 which obtains the phase difference of the magnetic field signal detected by the magnetic sensors 3A and 3B, and an angular calculating means 7 which calculates the absolute angle of the magnetic encoders based on the detected phase difference. COPYRIGHT: (C)2010,JPO&INPIT
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