Patent ID: 6246232
Filing Date: 2001-06-12
Classification: B62D,G01D

Abstract:
A rotation sensor comprising;a rotor;first and second rotation detection means for generating first and second detection signals, respectively, having a same period and different phase concomitantly with rotation of said rotor, wherein an output value of at least any one of said first and second detection signals changes gradually concomitantly with a turning of said rotor;third detection means for generating a third detection signal concomitantly with rotation of said rotor, wherein an output of said third detection signal increases gradually in the entire range of turning angle of said rotor when said rotor turns in a first direction, further wherein the output of said third detection signal decreases gradually when said rotor turns in a second direction opposite of said first direction; anda rotation angle calculation means that reads said third detection signal to obtain a rough turning angle of said rotor based on said third detection signal, reads said first and second detection signals to obtain a fine turning angle of said rotor based on said first and second detection signals, and determines an actual turning angle of said rotor based on the rough turning angle and the fine turning angle.