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DEVICE FOR DETECTING MULTI-TURN ABSOLUTE ROTATION ANGLE AND METHOD FOR DETECTING THE SAME | VORRICHTUNG ZUR ERKENNUNG EINES ABSOLUTEN DREHWINKELS BEI VIELFACHUMDREHUNG UND VERFAHREN ZUR DETEKTION DAVON | DISPOSITIF DE DÉTECTION D'ANGLE DE ROTATION ABSOLU MULTITOUR ET PROCÉDÉ DE DÉTECTION

Patentnummer:EP3081906B1
IPC Hauptklasse:G01D0005245
Anmelder:
Erfinder:
Anmeldung:06.01.12
Offenlegung:07.01.11
Patenterteilung:07.03.18

Abstract / Hauptanspruch
There is provided a method for calculating with high accuracy a multi-turn absolute rotation angle of a motor rotating shaft coupled to a motor output shaft. In a rotation angle detection device according to this invention, a rotation angle θ n of an n-th rotating shaft satisfies the relationship with a rotation angle θ1 of the motor rotating shaft: θn = (-(m±1)/m)n-1×θ1. The rotation angle detection device as an embodiment of a mechanism satisfying the relationship includes a gear mechanism in which a gear having (m±1) teeth meshes with a gear having m teeth between each adjacent two of first to n-th rotating shafts. A multi-turn rotation angle of the first rotating shaft is expanded to a detected value p1 of the first rotating shaft which is a rotation angle of the first rotating shaft and R0xm0+R1×m1+...Rn-2×mn-2 corresponding to the number of revolutions of the first rotating shaft, coefficients R0 to Rn-2 are obtained on the basis of detected values from angle detectors of the respective shafts, and the multi-turn rotation angle of the first rotating shaft is calculated. Detection errors generated in the angle detectors of the second and subsequent rotating shafts can be effectively reduced, and a high-accuracy multi-turn rotation angle can be calculated.

EP3081906B1


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