| 摘要 |
A rotation angle detection device has a magnetism detection unit, a magnetic flux generation unit for applying magnetic flux to the magnetism detection unit, and a magnetic flux alteration unit provided for the magnetic flux generation unit. The magnetic flux generation unit is rotated relatively to the magnetism detection unit. A relative rotation angle between the magnetism detection unit and the magnetic flux generation unit is detected based on a density of the magnetic flux passing through the magnetism detection unit. The magnetic flux alteration unit alters a distribution of the magnetic flux generated by the magnetic flux generation unit, to compensate a deviation of the distribution of the magnetic flux.
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