ROTATION SENSOR

摘要

The present invention provides a rotation sensor having an improved resolution for detection of a rotation angle of a rotor to be measured, enhanced noise resistance, and a high detection accuracy, the rotation sensor comprising: a main rotor (10) which integrally rotates with the rotor to be measured; a sub-rotor (12) which rotates in accordance with rotation of the main rotor with the number of revolutions which is different from that of the main rotor; first detecting means (50) for detecting rotation of the main rotor; and a second detecting means (62) for detecting rotation of the sub-rotor, the rotation sensor detecting an absolute rotation angle of the rotor to be measured from a detection signal from the first detecting means and a detection signal from the second detecting means, wherein the respective detection signals obtained from the first detecting means and the second detecting means are cyclically output in accordance with rotation of each rotor, and the following relationship is satisfied: Tm - Tc × i ) × n = Tm ( i and n are positive integers
where Tc is a cycle of the detection signal from the first detecting means, and Tm is a cycle of the detection signal from the second detecting means.