Rotation angle detection device

摘要

A rotation angle calculation unit includes a first rotation angle calculation portion, a second rotation angle calculation portion, a third rotation angle calculation portion, an abnormality monitoring portion, and a final rotation angle calculation portion. The abnormality monitoring portion determines, based on a first output signal, a second output signal, and a third output signal, whether the first to third output signals are each normal or abnormal. The final rotation angle calculation portion calculates a final rotation angle based on the final determination result obtained by the abnormality monitoring portion and the first to third rotation angles calculated by the first to third rotation angle calculation portions, respectively.

主权项

1. A rotation angle detection device that includes a first sensor, a second sensor, and a third sensor that output, respectively, a first sinusoidal signal, a second sinusoidal signal, and a third sinusoidal signal, which are different in phase from each other, according to rotation of a rotor, and that detects a rotation angle of the rotor based on the first, second, and third sinusoidal signals, comprising:
a determination unit that determines, based on the first sinusoidal signal, the second sinusoidal signal, and the third sinusoidal signal, whether the first sinusoidal signal, the second sinusoidal signal, and the third sinusoidal signal are each normal or abnormal, the determination unit comprising:
a first determination unit that determines, based on the first and second sinusoidal signals, whether there is a possibility that at least one of the first and second sinusoidal signals is presently abnormal;a second determination unit that determines, based on the first and third sinusoidal signals, whether there is a possibility that at least one of the first and third sinusoidal signals is presently abnormal;a third determination unit that determines, based on the second and third sinusoidal signals, whether there is a possibility that at least one of the second and third sinusoidal signals is presently abnormal; anda fourth determination unit that determines, based on results of determinations made by the first, second, and third determination units, whether the first sinusoidal signal, the second sinusoidal signal, and the third sinusoidal signal are each normal or abnormal; and a rotation angle calculation unit that calculates the rotation angle of the rotor based on at least two sinusoidal signals that are among the first sinusoidal signal, the second sinusoidal signal, and the third sinusoidal signal, and that are determined as being normal by the determination unit.